[RFC v4 13/17] selftest: Move protecton key selftest to arch neutral directory

From: Ram Pai
Date: Tue Jun 27 2017 - 06:13:14 EST

Next message: Ram Pai: "[RFC v4 14/17] selftest: PowerPC specific test updates to memory protection keys"
Previous message: Ram Pai: "[RFC v4 16/17] Documentation: PowerPC specific updates to memory protection keys"
In reply to: Ram Pai: "[RFC v4 16/17] Documentation: PowerPC specific updates to memory protection keys"
Next in thread: Ram Pai: "[RFC v4 14/17] selftest: PowerPC specific test updates to memory protection keys"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
---
tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/pkey-helpers.h | 219 ++++
tools/testing/selftests/vm/protection_keys.c | 1395 +++++++++++++++++++++++++
tools/testing/selftests/x86/Makefile | 2 +-
tools/testing/selftests/x86/pkey-helpers.h | 219 ----
tools/testing/selftests/x86/protection_keys.c | 1395 -------------------------
6 files changed, 1616 insertions(+), 1615 deletions(-)
create mode 100644 tools/testing/selftests/vm/pkey-helpers.h
create mode 100644 tools/testing/selftests/vm/protection_keys.c
delete mode 100644 tools/testing/selftests/x86/pkey-helpers.h
delete mode 100644 tools/testing/selftests/x86/protection_keys.c

diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index cbb29e4..1d32f78 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -17,6 +17,7 @@ TEST_GEN_FILES += transhuge-stress
TEST_GEN_FILES += userfaultfd
TEST_GEN_FILES += mlock-random-test
TEST_GEN_FILES += virtual_address_range
+TEST_GEN_FILES += protection_keys

TEST_PROGS := run_vmtests

diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h
new file mode 100644
index 0000000..b202939
--- /dev/null
+++ b/tools/testing/selftests/vm/pkey-helpers.h
@@ -0,0 +1,219 @@
+#ifndef _PKEYS_HELPER_H
+#define _PKEYS_HELPER_H
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <ucontext.h>
+#include <sys/mman.h>
+
+#define NR_PKEYS 16
+#define PKRU_BITS_PER_PKEY 2
+
+#ifndef DEBUG_LEVEL
+#define DEBUG_LEVEL 0
+#endif
+#define DPRINT_IN_SIGNAL_BUF_SIZE 4096
+extern int dprint_in_signal;
+extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
+static inline void sigsafe_printf(const char *format, ...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+ if (!dprint_in_signal) {
+ vprintf(format, ap);
+ } else {
+ int len = vsnprintf(dprint_in_signal_buffer,
+ DPRINT_IN_SIGNAL_BUF_SIZE,
+ format, ap);
+ /*
+ * len is amount that would have been printed,
+ * but actual write is truncated at BUF_SIZE.
+ */
+ if (len > DPRINT_IN_SIGNAL_BUF_SIZE)
+ len = DPRINT_IN_SIGNAL_BUF_SIZE;
+ write(1, dprint_in_signal_buffer, len);
+ }
+ va_end(ap);
+}
+#define dprintf_level(level, args...) do { \
+ if (level <= DEBUG_LEVEL) \
+ sigsafe_printf(args); \
+ fflush(NULL); \
+} while (0)
+#define dprintf0(args...) dprintf_level(0, args)
+#define dprintf1(args...) dprintf_level(1, args)
+#define dprintf2(args...) dprintf_level(2, args)
+#define dprintf3(args...) dprintf_level(3, args)
+#define dprintf4(args...) dprintf_level(4, args)
+
+extern unsigned int shadow_pkru;
+static inline unsigned int __rdpkru(void)
+{
+ unsigned int eax, edx;
+ unsigned int ecx = 0;
+ unsigned int pkru;
+
+ asm volatile(".byte 0x0f,0x01,0xee\n\t"
+ : "=a" (eax), "=d" (edx)
+ : "c" (ecx));
+ pkru = eax;
+ return pkru;
+}
+
+static inline unsigned int _rdpkru(int line)
+{
+ unsigned int pkru = __rdpkru();
+
+ dprintf4("rdpkru(line=%d) pkru: %x shadow: %x\n",
+ line, pkru, shadow_pkru);
+ assert(pkru == shadow_pkru);
+
+ return pkru;
+}
+
+#define rdpkru() _rdpkru(__LINE__)
+
+static inline void __wrpkru(unsigned int pkru)
+{
+ unsigned int eax = pkru;
+ unsigned int ecx = 0;
+ unsigned int edx = 0;
+
+ dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+ asm volatile(".byte 0x0f,0x01,0xef\n\t"
+ : : "a" (eax), "c" (ecx), "d" (edx));
+ assert(pkru == __rdpkru());
+}
+
+static inline void wrpkru(unsigned int pkru)
+{
+ dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+ /* will do the shadow check for us: */
+ rdpkru();
+ __wrpkru(pkru);
+ shadow_pkru = pkru;
+ dprintf4("%s(%08x) pkru: %08x\n", __func__, pkru, __rdpkru());
+}
+
+/*
+ * These are technically racy. since something could
+ * change PKRU between the read and the write.
+ */
+static inline void __pkey_access_allow(int pkey, int do_allow)
+{
+ unsigned int pkru = rdpkru();
+ int bit = pkey * 2;
+
+ if (do_allow)
+ pkru &= (1<<bit);
+ else
+ pkru |= (1<<bit);
+
+ dprintf4("pkru now: %08x\n", rdpkru());
+ wrpkru(pkru);
+}
+
+static inline void __pkey_write_allow(int pkey, int do_allow_write)
+{
+ long pkru = rdpkru();
+ int bit = pkey * 2 + 1;
+
+ if (do_allow_write)
+ pkru &= (1<<bit);
+ else
+ pkru |= (1<<bit);
+
+ wrpkru(pkru);
+ dprintf4("pkru now: %08x\n", rdpkru());
+}
+
+#define PROT_PKEY0 0x10 /* protection key value (bit 0) */
+#define PROT_PKEY1 0x20 /* protection key value (bit 1) */
+#define PROT_PKEY2 0x40 /* protection key value (bit 2) */
+#define PROT_PKEY3 0x80 /* protection key value (bit 3) */
+
+#define PAGE_SIZE 4096
+#define MB (1<<20)
+
+static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
+ unsigned int *ecx, unsigned int *edx)
+{
+ /* ecx is often an input as well as an output. */
+ asm volatile(
+ "cpuid;"
+ : "=a" (*eax),
+ "=b" (*ebx),
+ "=c" (*ecx),
+ "=d" (*edx)
+ : "0" (*eax), "2" (*ecx));
+}
+
+/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx) */
+#define X86_FEATURE_PKU (1<<3) /* Protection Keys for Userspace */
+#define X86_FEATURE_OSPKE (1<<4) /* OS Protection Keys Enable */
+
+static inline int cpu_has_pku(void)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+
+ eax = 0x7;
+ ecx = 0x0;
+ __cpuid(&eax, &ebx, &ecx, &edx);
+
+ if (!(ecx & X86_FEATURE_PKU)) {
+ dprintf2("cpu does not have PKU\n");
+ return 0;
+ }
+ if (!(ecx & X86_FEATURE_OSPKE)) {
+ dprintf2("cpu does not have OSPKE\n");
+ return 0;
+ }
+ return 1;
+}
+
+#define XSTATE_PKRU_BIT (9)
+#define XSTATE_PKRU 0x200
+
+int pkru_xstate_offset(void)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ int xstate_offset;
+ int xstate_size;
+ unsigned long XSTATE_CPUID = 0xd;
+ int leaf;
+
+ /* assume that XSTATE_PKRU is set in XCR0 */
+ leaf = XSTATE_PKRU_BIT;
+ {
+ eax = XSTATE_CPUID;
+ ecx = leaf;
+ __cpuid(&eax, &ebx, &ecx, &edx);
+
+ if (leaf == XSTATE_PKRU_BIT) {
+ xstate_offset = ebx;
+ xstate_size = eax;
+ }
+ }
+
+ if (xstate_size == 0) {
+ printf("could not find size/offset of PKRU in xsave state\n");
+ return 0;
+ }
+
+ return xstate_offset;
+}
+
+#endif /* _PKEYS_HELPER_H */
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
new file mode 100644
index 0000000..3237bc0
--- /dev/null
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -0,0 +1,1395 @@
+/*
+ * Tests x86 Memory Protection Keys (see Documentation/x86/protection-keys.txt)
+ *
+ * There are examples in here of:
+ * * how to set protection keys on memory
+ * * how to set/clear bits in PKRU (the rights register)
+ * * how to handle SEGV_PKRU signals and extract pkey-relevant
+ * information from the siginfo
+ *
+ * Things to add:
+ * make sure KSM and KSM COW breaking works
+ * prefault pages in at malloc, or not
+ * protect MPX bounds tables with protection keys?
+ * make sure VMA splitting/merging is working correctly
+ * OOMs can destroy mm->mmap (see exit_mmap()), so make sure it is immune to pkeys
+ * look for pkey "leaks" where it is still set on a VMA but "freed" back to the kernel
+ * do a plain mprotect() to a mprotect_pkey() area and make sure the pkey sticks
+ *
+ * Compile like this:
+ * gcc -o protection_keys -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
+ * gcc -m32 -o protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
+ */
+#define _GNU_SOURCE
+#include <errno.h>
+#include <linux/futex.h>
+#include <sys/time.h>
+#include <sys/syscall.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <ucontext.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ptrace.h>
+#include <setjmp.h>
+
+#include "pkey-helpers.h"
+
+int iteration_nr = 1;
+int test_nr;
+
+unsigned int shadow_pkru;
+
+#define HPAGE_SIZE (1UL<<21)
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
+#define ALIGN_UP(x, align_to) (((x) + ((align_to)-1)) & ~((align_to)-1))
+#define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
+#define ALIGN_PTR_UP(p, ptr_align_to) ((typeof(p))ALIGN_UP((unsigned long)(p), ptr_align_to))
+#define ALIGN_PTR_DOWN(p, ptr_align_to) ((typeof(p))ALIGN_DOWN((unsigned long)(p), ptr_align_to))
+#define __stringify_1(x...) #x
+#define __stringify(x...) __stringify_1(x)
+
+#define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
+
+int dprint_in_signal;
+char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
+
+extern void abort_hooks(void);
+#define pkey_assert(condition) do { \
+ if (!(condition)) { \
+ dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
+ __FILE__, __LINE__, \
+ test_nr, iteration_nr); \
+ dprintf0("errno at assert: %d", errno); \
+ abort_hooks(); \
+ assert(condition); \
+ } \
+} while (0)
+#define raw_assert(cond) assert(cond)
+
+void cat_into_file(char *str, char *file)
+{
+ int fd = open(file, O_RDWR);
+ int ret;
+
+ dprintf2("%s(): writing '%s' to '%s'\n", __func__, str, file);
+ /*
+ * these need to be raw because they are called under
+ * pkey_assert()
+ */
+ raw_assert(fd >= 0);
+ ret = write(fd, str, strlen(str));
+ if (ret != strlen(str)) {
+ perror("write to file failed");
+ fprintf(stderr, "filename: '%s' str: '%s'\n", file, str);
+ raw_assert(0);
+ }
+ close(fd);
+}
+
+#if CONTROL_TRACING > 0
+static int warned_tracing;
+int tracing_root_ok(void)
+{
+ if (geteuid() != 0) {
+ if (!warned_tracing)
+ fprintf(stderr, "WARNING: not run as root, "
+ "can not do tracing control\n");
+ warned_tracing = 1;
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+void tracing_on(void)
+{
+#if CONTROL_TRACING > 0
+#define TRACEDIR "/sys/kernel/debug/tracing"
+ char pidstr[32];
+
+ if (!tracing_root_ok())
+ return;
+
+ sprintf(pidstr, "%d", getpid());
+ cat_into_file("0", TRACEDIR "/tracing_on");
+ cat_into_file("\n", TRACEDIR "/trace");
+ if (1) {
+ cat_into_file("function_graph", TRACEDIR "/current_tracer");
+ cat_into_file("1", TRACEDIR "/options/funcgraph-proc");
+ } else {
+ cat_into_file("nop", TRACEDIR "/current_tracer");
+ }
+ cat_into_file(pidstr, TRACEDIR "/set_ftrace_pid");
+ cat_into_file("1", TRACEDIR "/tracing_on");
+ dprintf1("enabled tracing\n");
+#endif
+}
+
+void tracing_off(void)
+{
+#if CONTROL_TRACING > 0
+ if (!tracing_root_ok())
+ return;
+ cat_into_file("0", "/sys/kernel/debug/tracing/tracing_on");
+#endif
+}
+
+void abort_hooks(void)
+{
+ fprintf(stderr, "running %s()...\n", __func__);
+ tracing_off();
+#ifdef SLEEP_ON_ABORT
+ sleep(SLEEP_ON_ABORT);
+#endif
+}
+
+static inline void __page_o_noops(void)
+{
+ /* 8-bytes of instruction * 512 bytes = 1 page */
+ asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr");
+}
+
+/*
+ * This attempts to have roughly a page of instructions followed by a few
+ * instructions that do a write, and another page of instructions. That
+ * way, we are pretty sure that the write is in the second page of
+ * instructions and has at least a page of padding behind it.
+ *
+ * *That* lets us be sure to madvise() away the write instruction, which
+ * will then fault, which makes sure that the fault code handles
+ * execute-only memory properly.
+ */
+__attribute__((__aligned__(PAGE_SIZE)))
+void lots_o_noops_around_write(int *write_to_me)
+{
+ dprintf3("running %s()\n", __func__);
+ __page_o_noops();
+ /* Assume this happens in the second page of instructions: */
+ *write_to_me = __LINE__;
+ /* pad out by another page: */
+ __page_o_noops();
+ dprintf3("%s() done\n", __func__);
+}
+
+/* Define some kernel-like types */
+#define u8 uint8_t
+#define u16 uint16_t
+#define u32 uint32_t
+#define u64 uint64_t
+
+#ifdef __i386__
+#define SYS_mprotect_key 380
+#define SYS_pkey_alloc 381
+#define SYS_pkey_free 382
+#define REG_IP_IDX REG_EIP
+#define si_pkey_offset 0x14
+#else
+#define SYS_mprotect_key 329
+#define SYS_pkey_alloc 330
+#define SYS_pkey_free 331
+#define REG_IP_IDX REG_RIP
+#define si_pkey_offset 0x20
+#endif
+
+void dump_mem(void *dumpme, int len_bytes)
+{
+ char *c = (void *)dumpme;
+ int i;
+
+ for (i = 0; i < len_bytes; i += sizeof(u64)) {
+ u64 *ptr = (u64 *)(c + i);
+ dprintf1("dump[%03d][@%p]: %016jx\n", i, ptr, *ptr);
+ }
+}
+
+#define __SI_FAULT (3 << 16)
+#define SEGV_BNDERR (__SI_FAULT|3) /* failed address bound checks */
+#define SEGV_PKUERR (__SI_FAULT|4)
+
+static char *si_code_str(int si_code)
+{
+ if (si_code & SEGV_MAPERR)
+ return "SEGV_MAPERR";
+ if (si_code & SEGV_ACCERR)
+ return "SEGV_ACCERR";
+ if (si_code & SEGV_BNDERR)
+ return "SEGV_BNDERR";
+ if (si_code & SEGV_PKUERR)
+ return "SEGV_PKUERR";
+ return "UNKNOWN";
+}
+
+int pkru_faults;
+int last_si_pkey = -1;
+void signal_handler(int signum, siginfo_t *si, void *vucontext)
+{
+ ucontext_t *uctxt = vucontext;
+ int trapno;
+ unsigned long ip;
+ char *fpregs;
+ u32 *pkru_ptr;
+ u64 si_pkey;
+ u32 *si_pkey_ptr;
+ int pkru_offset;
+ fpregset_t fpregset;
+
+ dprint_in_signal = 1;
+ dprintf1(">>>>===============SIGSEGV============================\n");
+ dprintf1("%s()::%d, pkru: 0x%x shadow: %x\n", __func__, __LINE__,
+ __rdpkru(), shadow_pkru);
+
+ trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
+ ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
+ fpregset = uctxt->uc_mcontext.fpregs;
+ fpregs = (void *)fpregset;
+
+ dprintf2("%s() trapno: %d ip: 0x%lx info->si_code: %s/%d\n", __func__,
+ trapno, ip, si_code_str(si->si_code), si->si_code);
+#ifdef __i386__
+ /*
+ * 32-bit has some extra padding so that userspace can tell whether
+ * the XSTATE header is present in addition to the "legacy" FPU
+ * state. We just assume that it is here.
+ */
+ fpregs += 0x70;
+#endif
+ pkru_offset = pkru_xstate_offset();
+ pkru_ptr = (void *)(&fpregs[pkru_offset]);
+
+ dprintf1("siginfo: %p\n", si);
+ dprintf1(" fpregs: %p\n", fpregs);
+ /*
+ * If we got a PKRU fault, we *HAVE* to have at least one bit set in
+ * here.
+ */
+ dprintf1("pkru_xstate_offset: %d\n", pkru_xstate_offset());
+ if (DEBUG_LEVEL > 4)
+ dump_mem(pkru_ptr - 128, 256);
+ pkey_assert(*pkru_ptr);
+
+ si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
+ dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
+ dump_mem(si_pkey_ptr - 8, 24);
+ si_pkey = *si_pkey_ptr;
+ pkey_assert(si_pkey < NR_PKEYS);
+ last_si_pkey = si_pkey;
+
+ if ((si->si_code == SEGV_MAPERR) ||
+ (si->si_code == SEGV_ACCERR) ||
+ (si->si_code == SEGV_BNDERR)) {
+ printf("non-PK si_code, exiting...\n");
+ exit(4);
+ }
+
+ dprintf1("signal pkru from xsave: %08x\n", *pkru_ptr);
+ /* need __rdpkru() version so we do not do shadow_pkru checking */
+ dprintf1("signal pkru from pkru: %08x\n", __rdpkru());
+ dprintf1("si_pkey from siginfo: %jx\n", si_pkey);
+ *(u64 *)pkru_ptr = 0x00000000;
+ dprintf1("WARNING: set PRKU=0 to allow faulting instruction to continue\n");
+ pkru_faults++;
+ dprintf1("<<<<==================================================\n");
+ return;
+ if (trapno == 14) {
+ fprintf(stderr,
+ "ERROR: In signal handler, page fault, trapno = %d, ip = %016lx\n",
+ trapno, ip);
+ fprintf(stderr, "si_addr %p\n", si->si_addr);
+ fprintf(stderr, "REG_ERR: %lx\n",
+ (unsigned long)uctxt->uc_mcontext.gregs[REG_ERR]);
+ exit(1);
+ } else {
+ fprintf(stderr, "unexpected trap %d! at 0x%lx\n", trapno, ip);
+ fprintf(stderr, "si_addr %p\n", si->si_addr);
+ fprintf(stderr, "REG_ERR: %lx\n",
+ (unsigned long)uctxt->uc_mcontext.gregs[REG_ERR]);
+ exit(2);
+ }
+ dprint_in_signal = 0;
+}
+
+int wait_all_children(void)
+{
+ int status;
+ return waitpid(-1, &status, 0);
+}
+
+void sig_chld(int x)
+{
+ dprint_in_signal = 1;
+ dprintf2("[%d] SIGCHLD: %d\n", getpid(), x);
+ dprint_in_signal = 0;
+}
+
+void setup_sigsegv_handler(void)
+{
+ int r, rs;
+ struct sigaction newact;
+ struct sigaction oldact;
+
+ /* #PF is mapped to sigsegv */
+ int signum = SIGSEGV;
+
+ newact.sa_handler = 0;
+ newact.sa_sigaction = signal_handler;
+
+ /*sigset_t - signals to block while in the handler */
+ /* get the old signal mask. */
+ rs = sigprocmask(SIG_SETMASK, 0, &newact.sa_mask);
+ pkey_assert(rs == 0);
+
+ /* call sa_sigaction, not sa_handler*/
+ newact.sa_flags = SA_SIGINFO;
+
+ newact.sa_restorer = 0; /* void(*)(), obsolete */
+ r = sigaction(signum, &newact, &oldact);
+ r = sigaction(SIGALRM, &newact, &oldact);
+ pkey_assert(r == 0);
+}
+
+void setup_handlers(void)
+{
+ signal(SIGCHLD, &sig_chld);
+ setup_sigsegv_handler();
+}
+
+pid_t fork_lazy_child(void)
+{
+ pid_t forkret;
+
+ forkret = fork();
+ pkey_assert(forkret >= 0);
+ dprintf3("[%d] fork() ret: %d\n", getpid(), forkret);
+
+ if (!forkret) {
+ /* in the child */
+ while (1) {
+ dprintf1("child sleeping...\n");
+ sleep(30);
+ }
+ }
+ return forkret;
+}
+
+void davecmp(void *_a, void *_b, int len)
+{
+ int i;
+ unsigned long *a = _a;
+ unsigned long *b = _b;
+
+ for (i = 0; i < len / sizeof(*a); i++) {
+ if (a[i] == b[i])
+ continue;
+
+ dprintf3("[%3d]: a: %016lx b: %016lx\n", i, a[i], b[i]);
+ }
+}
+
+void dumpit(char *f)
+{
+ int fd = open(f, O_RDONLY);
+ char buf[100];
+ int nr_read;
+
+ dprintf2("maps fd: %d\n", fd);
+ do {
+ nr_read = read(fd, &buf[0], sizeof(buf));
+ write(1, buf, nr_read);
+ } while (nr_read > 0);
+ close(fd);
+}
+
+#define PKEY_DISABLE_ACCESS 0x1
+#define PKEY_DISABLE_WRITE 0x2
+
+u32 pkey_get(int pkey, unsigned long flags)
+{
+ u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
+ u32 pkru = __rdpkru();
+ u32 shifted_pkru;
+ u32 masked_pkru;
+
+ dprintf1("%s(pkey=%d, flags=%lx) = %x / %d\n",
+ __func__, pkey, flags, 0, 0);
+ dprintf2("%s() raw pkru: %x\n", __func__, pkru);
+
+ shifted_pkru = (pkru >> (pkey * PKRU_BITS_PER_PKEY));
+ dprintf2("%s() shifted_pkru: %x\n", __func__, shifted_pkru);
+ masked_pkru = shifted_pkru & mask;
+ dprintf2("%s() masked pkru: %x\n", __func__, masked_pkru);
+ /*
+ * shift down the relevant bits to the lowest two, then
+ * mask off all the other high bits.
+ */
+ return masked_pkru;
+}
+
+int pkey_set(int pkey, unsigned long rights, unsigned long flags)
+{
+ u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
+ u32 old_pkru = __rdpkru();
+ u32 new_pkru;
+
+ /* make sure that 'rights' only contains the bits we expect: */
+ assert(!(rights & ~mask));
+
+ /* copy old pkru */
+ new_pkru = old_pkru;
+ /* mask out bits from pkey in old value: */
+ new_pkru &= ~(mask << (pkey * PKRU_BITS_PER_PKEY));
+ /* OR in new bits for pkey: */
+ new_pkru |= (rights << (pkey * PKRU_BITS_PER_PKEY));
+
+ __wrpkru(new_pkru);
+
+ dprintf3("%s(pkey=%d, rights=%lx, flags=%lx) = %x pkru now: %x old_pkru: %x\n",
+ __func__, pkey, rights, flags, 0, __rdpkru(), old_pkru);
+ return 0;
+}
+
+void pkey_disable_set(int pkey, int flags)
+{
+ unsigned long syscall_flags = 0;
+ int ret;
+ int pkey_rights;
+ u32 orig_pkru = rdpkru();
+
+ dprintf1("START->%s(%d, 0x%x)\n", __func__,
+ pkey, flags);
+ pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
+
+ pkey_rights = pkey_get(pkey, syscall_flags);
+
+ dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
+ pkey, pkey, pkey_rights);
+ pkey_assert(pkey_rights >= 0);
+
+ pkey_rights |= flags;
+
+ ret = pkey_set(pkey, pkey_rights, syscall_flags);
+ assert(!ret);
+ /*pkru and flags have the same format */
+ shadow_pkru |= flags << (pkey * 2);
+ dprintf1("%s(%d) shadow: 0x%x\n", __func__, pkey, shadow_pkru);
+
+ pkey_assert(ret >= 0);
+
+ pkey_rights = pkey_get(pkey, syscall_flags);
+ dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
+ pkey, pkey, pkey_rights);
+
+ dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
+ if (flags)
+ pkey_assert(rdpkru() > orig_pkru);
+ dprintf1("END<---%s(%d, 0x%x)\n", __func__,
+ pkey, flags);
+}
+
+void pkey_disable_clear(int pkey, int flags)
+{
+ unsigned long syscall_flags = 0;
+ int ret;
+ int pkey_rights = pkey_get(pkey, syscall_flags);
+ u32 orig_pkru = rdpkru();
+
+ pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
+
+ dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
+ pkey, pkey, pkey_rights);
+ pkey_assert(pkey_rights >= 0);
+
+ pkey_rights |= flags;
+
+ ret = pkey_set(pkey, pkey_rights, 0);
+ /* pkru and flags have the same format */
+ shadow_pkru &= ~(flags << (pkey * 2));
+ pkey_assert(ret >= 0);
+
+ pkey_rights = pkey_get(pkey, syscall_flags);
+ dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
+ pkey, pkey, pkey_rights);
+
+ dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
+ if (flags)
+ assert(rdpkru() > orig_pkru);
+}
+
+void pkey_write_allow(int pkey)
+{
+ pkey_disable_clear(pkey, PKEY_DISABLE_WRITE);
+}
+void pkey_write_deny(int pkey)
+{
+ pkey_disable_set(pkey, PKEY_DISABLE_WRITE);
+}
+void pkey_access_allow(int pkey)
+{
+ pkey_disable_clear(pkey, PKEY_DISABLE_ACCESS);
+}
+void pkey_access_deny(int pkey)
+{
+ pkey_disable_set(pkey, PKEY_DISABLE_ACCESS);
+}
+
+int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+ unsigned long pkey)
+{
+ int sret;
+
+ dprintf2("%s(0x%p, %zx, prot=%lx, pkey=%lx)\n", __func__,
+ ptr, size, orig_prot, pkey);
+
+ errno = 0;
+ sret = syscall(SYS_mprotect_key, ptr, size, orig_prot, pkey);
+ if (errno) {
+ dprintf2("SYS_mprotect_key sret: %d\n", sret);
+ dprintf2("SYS_mprotect_key prot: 0x%lx\n", orig_prot);
+ dprintf2("SYS_mprotect_key failed, errno: %d\n", errno);
+ if (DEBUG_LEVEL >= 2)
+ perror("SYS_mprotect_pkey");
+ }
+ return sret;
+}
+
+int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
+{
+ int ret = syscall(SYS_pkey_alloc, flags, init_val);
+ dprintf1("%s(flags=%lx, init_val=%lx) syscall ret: %d errno: %d\n",
+ __func__, flags, init_val, ret, errno);
+ return ret;
+}
+
+int alloc_pkey(void)
+{
+ int ret;
+ unsigned long init_val = 0x0;
+
+ dprintf1("alloc_pkey()::%d, pkru: 0x%x shadow: %x\n",
+ __LINE__, __rdpkru(), shadow_pkru);
+ ret = sys_pkey_alloc(0, init_val);
+ /*
+ * pkey_alloc() sets PKRU, so we need to reflect it in
+ * shadow_pkru:
+ */
+ dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ if (ret) {
+ /* clear both the bits: */
+ shadow_pkru &= ~(0x3 << (ret * 2));
+ dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ /*
+ * move the new state in from init_val
+ * (remember, we cheated and init_val == pkru format)
+ */
+ shadow_pkru |= (init_val << (ret * 2));
+ }
+ dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ dprintf1("alloc_pkey()::%d errno: %d\n", __LINE__, errno);
+ /* for shadow checking: */
+ rdpkru();
+ dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ return ret;
+}
+
+int sys_pkey_free(unsigned long pkey)
+{
+ int ret = syscall(SYS_pkey_free, pkey);
+ dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret);
+ return ret;
+}
+
+/*
+ * I had a bug where pkey bits could be set by mprotect() but
+ * not cleared. This ensures we get lots of random bit sets
+ * and clears on the vma and pte pkey bits.
+ */
+int alloc_random_pkey(void)
+{
+ int max_nr_pkey_allocs;
+ int ret;
+ int i;
+ int alloced_pkeys[NR_PKEYS];
+ int nr_alloced = 0;
+ int random_index;
+ memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
+
+ /* allocate every possible key and make a note of which ones we got */
+ max_nr_pkey_allocs = NR_PKEYS;
+ max_nr_pkey_allocs = 1;
+ for (i = 0; i < max_nr_pkey_allocs; i++) {
+ int new_pkey = alloc_pkey();
+ if (new_pkey < 0)
+ break;
+ alloced_pkeys[nr_alloced++] = new_pkey;
+ }
+
+ pkey_assert(nr_alloced > 0);
+ /* select a random one out of the allocated ones */
+ random_index = rand() % nr_alloced;
+ ret = alloced_pkeys[random_index];
+ /* now zero it out so we don't free it next */
+ alloced_pkeys[random_index] = 0;
+
+ /* go through the allocated ones that we did not want and free them */
+ for (i = 0; i < nr_alloced; i++) {
+ int free_ret;
+ if (!alloced_pkeys[i])
+ continue;
+ free_ret = sys_pkey_free(alloced_pkeys[i]);
+ pkey_assert(!free_ret);
+ }
+ dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ return ret;
+}
+
+int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+ unsigned long pkey)
+{
+ int nr_iterations = random() % 100;
+ int ret;
+
+ while (0) {
+ int rpkey = alloc_random_pkey();
+ ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
+ dprintf1("sys_mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
+ ptr, size, orig_prot, pkey, ret);
+ if (nr_iterations-- < 0)
+ break;
+
+ dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ sys_pkey_free(rpkey);
+ dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ }
+ pkey_assert(pkey < NR_PKEYS);
+
+ ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
+ dprintf1("mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
+ ptr, size, orig_prot, pkey, ret);
+ pkey_assert(!ret);
+ dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, ret, __rdpkru(), shadow_pkru);
+ return ret;
+}
+
+struct pkey_malloc_record {
+ void *ptr;
+ long size;
+};
+struct pkey_malloc_record *pkey_malloc_records;
+long nr_pkey_malloc_records;
+void record_pkey_malloc(void *ptr, long size)
+{
+ long i;
+ struct pkey_malloc_record *rec = NULL;
+
+ for (i = 0; i < nr_pkey_malloc_records; i++) {
+ rec = &pkey_malloc_records[i];
+ /* find a free record */
+ if (rec)
+ break;
+ }
+ if (!rec) {
+ /* every record is full */
+ size_t old_nr_records = nr_pkey_malloc_records;
+ size_t new_nr_records = (nr_pkey_malloc_records * 2 + 1);
+ size_t new_size = new_nr_records * sizeof(struct pkey_malloc_record);
+ dprintf2("new_nr_records: %zd\n", new_nr_records);
+ dprintf2("new_size: %zd\n", new_size);
+ pkey_malloc_records = realloc(pkey_malloc_records, new_size);
+ pkey_assert(pkey_malloc_records != NULL);
+ rec = &pkey_malloc_records[nr_pkey_malloc_records];
+ /*
+ * realloc() does not initialize memory, so zero it from
+ * the first new record all the way to the end.
+ */
+ for (i = 0; i < new_nr_records - old_nr_records; i++)
+ memset(rec + i, 0, sizeof(*rec));
+ }
+ dprintf3("filling malloc record[%d/%p]: {%p, %ld}\n",
+ (int)(rec - pkey_malloc_records), rec, ptr, size);
+ rec->ptr = ptr;
+ rec->size = size;
+ nr_pkey_malloc_records++;
+}
+
+void free_pkey_malloc(void *ptr)
+{
+ long i;
+ int ret;
+ dprintf3("%s(%p)\n", __func__, ptr);
+ for (i = 0; i < nr_pkey_malloc_records; i++) {
+ struct pkey_malloc_record *rec = &pkey_malloc_records[i];
+ dprintf4("looking for ptr %p at record[%ld/%p]: {%p, %ld}\n",
+ ptr, i, rec, rec->ptr, rec->size);
+ if ((ptr < rec->ptr) ||
+ (ptr >= rec->ptr + rec->size))
+ continue;
+
+ dprintf3("found ptr %p at record[%ld/%p]: {%p, %ld}\n",
+ ptr, i, rec, rec->ptr, rec->size);
+ nr_pkey_malloc_records--;
+ ret = munmap(rec->ptr, rec->size);
+ dprintf3("munmap ret: %d\n", ret);
+ pkey_assert(!ret);
+ dprintf3("clearing rec->ptr, rec: %p\n", rec);
+ rec->ptr = NULL;
+ dprintf3("done clearing rec->ptr, rec: %p\n", rec);
+ return;
+ }
+ pkey_assert(false);
+}
+
+
+void *malloc_pkey_with_mprotect(long size, int prot, u16 pkey)
+{
+ void *ptr;
+ int ret;
+
+ rdpkru();
+ dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+ size, prot, pkey);
+ pkey_assert(pkey < NR_PKEYS);
+ ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ pkey_assert(ptr != (void *)-1);
+ ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
+ pkey_assert(!ret);
+ record_pkey_malloc(ptr, size);
+ rdpkru();
+
+ dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
+ return ptr;
+}
+
+void *malloc_pkey_anon_huge(long size, int prot, u16 pkey)
+{
+ int ret;
+ void *ptr;
+
+ dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+ size, prot, pkey);
+ /*
+ * Guarantee we can fit at least one huge page in the resulting
+ * allocation by allocating space for 2:
+ */
+ size = ALIGN_UP(size, HPAGE_SIZE * 2);
+ ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ pkey_assert(ptr != (void *)-1);
+ record_pkey_malloc(ptr, size);
+ mprotect_pkey(ptr, size, prot, pkey);
+
+ dprintf1("unaligned ptr: %p\n", ptr);
+ ptr = ALIGN_PTR_UP(ptr, HPAGE_SIZE);
+ dprintf1(" aligned ptr: %p\n", ptr);
+ ret = madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE);
+ dprintf1("MADV_HUGEPAGE ret: %d\n", ret);
+ ret = madvise(ptr, HPAGE_SIZE, MADV_WILLNEED);
+ dprintf1("MADV_WILLNEED ret: %d\n", ret);
+ memset(ptr, 0, HPAGE_SIZE);
+
+ dprintf1("mmap()'d thp for pkey %d @ %p\n", pkey, ptr);
+ return ptr;
+}
+
+int hugetlb_setup_ok;
+#define GET_NR_HUGE_PAGES 10
+void setup_hugetlbfs(void)
+{
+ int err;
+ int fd;
+ char buf[] = "123";
+
+ if (geteuid() != 0) {
+ fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
+ return;
+ }
+
+ cat_into_file(__stringify(GET_NR_HUGE_PAGES), "/proc/sys/vm/nr_hugepages");
+
+ /*
+ * Now go make sure that we got the pages and that they
+ * are 2M pages. Someone might have made 1G the default.
+ */
+ fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
+ if (fd < 0) {
+ perror("opening sysfs 2M hugetlb config");
+ return;
+ }
+
+ /* -1 to guarantee leaving the trailing \0 */
+ err = read(fd, buf, sizeof(buf)-1);
+ close(fd);
+ if (err <= 0) {
+ perror("reading sysfs 2M hugetlb config");
+ return;
+ }
+
+ if (atoi(buf) != GET_NR_HUGE_PAGES) {
+ fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
+ buf, GET_NR_HUGE_PAGES);
+ return;
+ }
+
+ hugetlb_setup_ok = 1;
+}
+
+void *malloc_pkey_hugetlb(long size, int prot, u16 pkey)
+{
+ void *ptr;
+ int flags = MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB;
+
+ if (!hugetlb_setup_ok)
+ return PTR_ERR_ENOTSUP;
+
+ dprintf1("doing %s(%ld, %x, %x)\n", __func__, size, prot, pkey);
+ size = ALIGN_UP(size, HPAGE_SIZE * 2);
+ pkey_assert(pkey < NR_PKEYS);
+ ptr = mmap(NULL, size, PROT_NONE, flags, -1, 0);
+ pkey_assert(ptr != (void *)-1);
+ mprotect_pkey(ptr, size, prot, pkey);
+
+ record_pkey_malloc(ptr, size);
+
+ dprintf1("mmap()'d hugetlbfs for pkey %d @ %p\n", pkey, ptr);
+ return ptr;
+}
+
+void *malloc_pkey_mmap_dax(long size, int prot, u16 pkey)
+{
+ void *ptr;
+ int fd;
+
+ dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+ size, prot, pkey);
+ pkey_assert(pkey < NR_PKEYS);
+ fd = open("/dax/foo", O_RDWR);
+ pkey_assert(fd >= 0);
+
+ ptr = mmap(0, size, prot, MAP_SHARED, fd, 0);
+ pkey_assert(ptr != (void *)-1);
+
+ mprotect_pkey(ptr, size, prot, pkey);
+
+ record_pkey_malloc(ptr, size);
+
+ dprintf1("mmap()'d for pkey %d @ %p\n", pkey, ptr);
+ close(fd);
+ return ptr;
+}
+
+void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {
+
+ malloc_pkey_with_mprotect,
+ malloc_pkey_anon_huge,
+ malloc_pkey_hugetlb
+/* can not do direct with the pkey_mprotect() API:
+ malloc_pkey_mmap_direct,
+ malloc_pkey_mmap_dax,
+*/
+};
+
+void *malloc_pkey(long size, int prot, u16 pkey)
+{
+ void *ret;
+ static int malloc_type;
+ int nr_malloc_types = ARRAY_SIZE(pkey_malloc);
+
+ pkey_assert(pkey < NR_PKEYS);
+
+ while (1) {
+ pkey_assert(malloc_type < nr_malloc_types);
+
+ ret = pkey_malloc[malloc_type](size, prot, pkey);
+ pkey_assert(ret != (void *)-1);
+
+ malloc_type++;
+ if (malloc_type >= nr_malloc_types)
+ malloc_type = (random()%nr_malloc_types);
+
+ /* try again if the malloc_type we tried is unsupported */
+ if (ret == PTR_ERR_ENOTSUP)
+ continue;
+
+ break;
+ }
+
+ dprintf3("%s(%ld, prot=%x, pkey=%x) returning: %p\n", __func__,
+ size, prot, pkey, ret);
+ return ret;
+}
+
+int last_pkru_faults;
+void expected_pk_fault(int pkey)
+{
+ dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
+ __func__, last_pkru_faults, pkru_faults);
+ dprintf2("%s(%d): last_si_pkey: %d\n", __func__, pkey, last_si_pkey);
+ pkey_assert(last_pkru_faults + 1 == pkru_faults);
+ pkey_assert(last_si_pkey == pkey);
+ /*
+ * The signal handler shold have cleared out PKRU to let the
+ * test program continue. We now have to restore it.
+ */
+ if (__rdpkru() != 0)
+ pkey_assert(0);
+
+ __wrpkru(shadow_pkru);
+ dprintf1("%s() set PKRU=%x to restore state after signal nuked it\n",
+ __func__, shadow_pkru);
+ last_pkru_faults = pkru_faults;
+ last_si_pkey = -1;
+}
+
+void do_not_expect_pk_fault(void)
+{
+ pkey_assert(last_pkru_faults == pkru_faults);
+}
+
+int test_fds[10] = { -1 };
+int nr_test_fds;
+void __save_test_fd(int fd)
+{
+ pkey_assert(fd >= 0);
+ pkey_assert(nr_test_fds < ARRAY_SIZE(test_fds));
+ test_fds[nr_test_fds] = fd;
+ nr_test_fds++;
+}
+
+int get_test_read_fd(void)
+{
+ int test_fd = open("/etc/passwd", O_RDONLY);
+ __save_test_fd(test_fd);
+ return test_fd;
+}
+
+void close_test_fds(void)
+{
+ int i;
+
+ for (i = 0; i < nr_test_fds; i++) {
+ if (test_fds[i] < 0)
+ continue;
+ close(test_fds[i]);
+ test_fds[i] = -1;
+ }
+ nr_test_fds = 0;
+}
+
+#define barrier() __asm__ __volatile__("": : :"memory")
+__attribute__((noinline)) int read_ptr(int *ptr)
+{
+ /*
+ * Keep GCC from optimizing this away somehow
+ */
+ barrier();
+ return *ptr;
+}
+
+void test_read_of_write_disabled_region(int *ptr, u16 pkey)
+{
+ int ptr_contents;
+
+ dprintf1("disabling write access to PKEY[1], doing read\n");
+ pkey_write_deny(pkey);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("*ptr: %d\n", ptr_contents);
+ dprintf1("\n");
+}
+void test_read_of_access_disabled_region(int *ptr, u16 pkey)
+{
+ int ptr_contents;
+
+ dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", pkey, ptr);
+ rdpkru();
+ pkey_access_deny(pkey);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("*ptr: %d\n", ptr_contents);
+ expected_pk_fault(pkey);
+}
+void test_write_of_write_disabled_region(int *ptr, u16 pkey)
+{
+ dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
+ pkey_write_deny(pkey);
+ *ptr = __LINE__;
+ expected_pk_fault(pkey);
+}
+void test_write_of_access_disabled_region(int *ptr, u16 pkey)
+{
+ dprintf1("disabling access to PKEY[%02d], doing write\n", pkey);
+ pkey_access_deny(pkey);
+ *ptr = __LINE__;
+ expected_pk_fault(pkey);
+}
+void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
+{
+ int ret;
+ int test_fd = get_test_read_fd();
+
+ dprintf1("disabling access to PKEY[%02d], "
+ "having kernel read() to buffer\n", pkey);
+ pkey_access_deny(pkey);
+ ret = read(test_fd, ptr, 1);
+ dprintf1("read ret: %d\n", ret);
+ pkey_assert(ret);
+}
+void test_kernel_write_of_write_disabled_region(int *ptr, u16 pkey)
+{
+ int ret;
+ int test_fd = get_test_read_fd();
+
+ pkey_write_deny(pkey);
+ ret = read(test_fd, ptr, 100);
+ dprintf1("read ret: %d\n", ret);
+ if (ret < 0 && (DEBUG_LEVEL > 0))
+ perror("verbose read result (OK for this to be bad)");
+ pkey_assert(ret);
+}
+
+void test_kernel_gup_of_access_disabled_region(int *ptr, u16 pkey)
+{
+ int pipe_ret, vmsplice_ret;
+ struct iovec iov;
+ int pipe_fds[2];
+
+ pipe_ret = pipe(pipe_fds);
+
+ pkey_assert(pipe_ret == 0);
+ dprintf1("disabling access to PKEY[%02d], "
+ "having kernel vmsplice from buffer\n", pkey);
+ pkey_access_deny(pkey);
+ iov.iov_base = ptr;
+ iov.iov_len = PAGE_SIZE;
+ vmsplice_ret = vmsplice(pipe_fds[1], &iov, 1, SPLICE_F_GIFT);
+ dprintf1("vmsplice() ret: %d\n", vmsplice_ret);
+ pkey_assert(vmsplice_ret == -1);
+
+ close(pipe_fds[0]);
+ close(pipe_fds[1]);
+}
+
+void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
+{
+ int ignored = 0xdada;
+ int futex_ret;
+ int some_int = __LINE__;
+
+ dprintf1("disabling write to PKEY[%02d], "
+ "doing futex gunk in buffer\n", pkey);
+ *ptr = some_int;
+ pkey_write_deny(pkey);
+ futex_ret = syscall(SYS_futex, ptr, FUTEX_WAIT, some_int-1, NULL,
+ &ignored, ignored);
+ if (DEBUG_LEVEL > 0)
+ perror("futex");
+ dprintf1("futex() ret: %d\n", futex_ret);
+}
+
+/* Assumes that all pkeys other than 'pkey' are unallocated */
+void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
+{
+ int err;
+ int i;
+
+ /* Note: 0 is the default pkey, so don't mess with it */
+ for (i = 1; i < NR_PKEYS; i++) {
+ if (pkey == i)
+ continue;
+
+ dprintf1("trying get/set/free to non-allocated pkey: %2d\n", i);
+ err = sys_pkey_free(i);
+ pkey_assert(err);
+
+ err = sys_pkey_free(i);
+ pkey_assert(err);
+
+ err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, i);
+ pkey_assert(err);
+ }
+}
+
+/* Assumes that all pkeys other than 'pkey' are unallocated */
+void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
+{
+ int err;
+ int bad_pkey = NR_PKEYS+99;
+
+ /* pass a known-invalid pkey in: */
+ err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, bad_pkey);
+ pkey_assert(err);
+}
+
+/* Assumes that all pkeys other than 'pkey' are unallocated */
+void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
+{
+ int err;
+ int allocated_pkeys[NR_PKEYS] = {0};
+ int nr_allocated_pkeys = 0;
+ int i;
+
+ for (i = 0; i < NR_PKEYS*2; i++) {
+ int new_pkey;
+ dprintf1("%s() alloc loop: %d\n", __func__, i);
+ new_pkey = alloc_pkey();
+ dprintf4("%s()::%d, err: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, err, __rdpkru(), shadow_pkru);
+ rdpkru(); /* for shadow checking */
+ dprintf2("%s() errno: %d ENOSPC: %d\n", __func__, errno, ENOSPC);
+ if ((new_pkey == -1) && (errno == ENOSPC)) {
+ dprintf2("%s() failed to allocate pkey after %d tries\n",
+ __func__, nr_allocated_pkeys);
+ break;
+ }
+ pkey_assert(nr_allocated_pkeys < NR_PKEYS);
+ allocated_pkeys[nr_allocated_pkeys++] = new_pkey;
+ }
+
+ dprintf3("%s()::%d\n", __func__, __LINE__);
+
+ /*
+ * ensure it did not reach the end of the loop without
+ * failure:
+ */
+ pkey_assert(i < NR_PKEYS*2);
+
+ /*
+ * There are 16 pkeys supported in hardware. One is taken
+ * up for the default (0) and another can be taken up by
+ * an execute-only mapping. Ensure that we can allocate
+ * at least 14 (16-2).
+ */
+ pkey_assert(i >= NR_PKEYS-2);
+
+ for (i = 0; i < nr_allocated_pkeys; i++) {
+ err = sys_pkey_free(allocated_pkeys[i]);
+ pkey_assert(!err);
+ rdpkru(); /* for shadow checking */
+ }
+}
+
+void test_ptrace_of_child(int *ptr, u16 pkey)
+{
+ __attribute__((__unused__)) int peek_result;
+ pid_t child_pid;
+ void *ignored = 0;
+ long ret;
+ int status;
+ /*
+ * This is the "control" for our little expermient. Make sure
+ * we can always access it when ptracing.
+ */
+ int *plain_ptr_unaligned = malloc(HPAGE_SIZE);
+ int *plain_ptr = ALIGN_PTR_UP(plain_ptr_unaligned, PAGE_SIZE);
+
+ /*
+ * Fork a child which is an exact copy of this process, of course.
+ * That means we can do all of our tests via ptrace() and then plain
+ * memory access and ensure they work differently.
+ */
+ child_pid = fork_lazy_child();
+ dprintf1("[%d] child pid: %d\n", getpid(), child_pid);
+
+ ret = ptrace(PTRACE_ATTACH, child_pid, ignored, ignored);
+ if (ret)
+ perror("attach");
+ dprintf1("[%d] attach ret: %ld %d\n", getpid(), ret, __LINE__);
+ pkey_assert(ret != -1);
+ ret = waitpid(child_pid, &status, WUNTRACED);
+ if ((ret != child_pid) || !(WIFSTOPPED(status))) {
+ fprintf(stderr, "weird waitpid result %ld stat %x\n",
+ ret, status);
+ pkey_assert(0);
+ }
+ dprintf2("waitpid ret: %ld\n", ret);
+ dprintf2("waitpid status: %d\n", status);
+
+ pkey_access_deny(pkey);
+ pkey_write_deny(pkey);
+
+ /* Write access, untested for now:
+ ret = ptrace(PTRACE_POKEDATA, child_pid, peek_at, data);
+ pkey_assert(ret != -1);
+ dprintf1("poke at %p: %ld\n", peek_at, ret);
+ */
+
+ /*
+ * Try to access the pkey-protected "ptr" via ptrace:
+ */
+ ret = ptrace(PTRACE_PEEKDATA, child_pid, ptr, ignored);
+ /* expect it to work, without an error: */
+ pkey_assert(ret != -1);
+ /* Now access from the current task, and expect an exception: */
+ peek_result = read_ptr(ptr);
+ expected_pk_fault(pkey);
+
+ /*
+ * Try to access the NON-pkey-protected "plain_ptr" via ptrace:
+ */
+ ret = ptrace(PTRACE_PEEKDATA, child_pid, plain_ptr, ignored);
+ /* expect it to work, without an error: */
+ pkey_assert(ret != -1);
+ /* Now access from the current task, and expect NO exception: */
+ peek_result = read_ptr(plain_ptr);
+ do_not_expect_pk_fault();
+
+ ret = ptrace(PTRACE_DETACH, child_pid, ignored, 0);
+ pkey_assert(ret != -1);
+
+ ret = kill(child_pid, SIGKILL);
+ pkey_assert(ret != -1);
+
+ wait(&status);
+
+ free(plain_ptr_unaligned);
+}
+
+void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
+{
+ void *p1;
+ int scratch;
+ int ptr_contents;
+ int ret;
+
+ p1 = ALIGN_PTR_UP(&lots_o_noops_around_write, PAGE_SIZE);
+ dprintf3("&lots_o_noops: %p\n", &lots_o_noops_around_write);
+ /* lots_o_noops_around_write should be page-aligned already */
+ assert(p1 == &lots_o_noops_around_write);
+
+ /* Point 'p1' at the *second* page of the function: */
+ p1 += PAGE_SIZE;
+
+ madvise(p1, PAGE_SIZE, MADV_DONTNEED);
+ lots_o_noops_around_write(&scratch);
+ ptr_contents = read_ptr(p1);
+ dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+
+ ret = mprotect_pkey(p1, PAGE_SIZE, PROT_EXEC, (u64)pkey);
+ pkey_assert(!ret);
+ pkey_access_deny(pkey);
+
+ dprintf2("pkru: %x\n", rdpkru());
+
+ /*
+ * Make sure this is an *instruction* fault
+ */
+ madvise(p1, PAGE_SIZE, MADV_DONTNEED);
+ lots_o_noops_around_write(&scratch);
+ do_not_expect_pk_fault();
+ ptr_contents = read_ptr(p1);
+ dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+ expected_pk_fault(pkey);
+}
+
+void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
+{
+ int size = PAGE_SIZE;
+ int sret;
+
+ if (cpu_has_pku()) {
+ dprintf1("SKIP: %s: no CPU support\n", __func__);
+ return;
+ }
+
+ sret = syscall(SYS_mprotect_key, ptr, size, PROT_READ, pkey);
+ pkey_assert(sret < 0);
+}
+
+void (*pkey_tests[])(int *ptr, u16 pkey) = {
+ test_read_of_write_disabled_region,
+ test_read_of_access_disabled_region,
+ test_write_of_write_disabled_region,
+ test_write_of_access_disabled_region,
+ test_kernel_write_of_access_disabled_region,
+ test_kernel_write_of_write_disabled_region,
+ test_kernel_gup_of_access_disabled_region,
+ test_kernel_gup_write_to_write_disabled_region,
+ test_executing_on_unreadable_memory,
+ test_ptrace_of_child,
+ test_pkey_syscalls_on_non_allocated_pkey,
+ test_pkey_syscalls_bad_args,
+ test_pkey_alloc_exhaust,
+};
+
+void run_tests_once(void)
+{
+ int *ptr;
+ int prot = PROT_READ|PROT_WRITE;
+
+ for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) {
+ int pkey;
+ int orig_pkru_faults = pkru_faults;
+
+ dprintf1("======================\n");
+ dprintf1("test %d preparing...\n", test_nr);
+
+ tracing_on();
+ pkey = alloc_random_pkey();
+ dprintf1("test %d starting with pkey: %d\n", test_nr, pkey);
+ ptr = malloc_pkey(PAGE_SIZE, prot, pkey);
+ dprintf1("test %d starting...\n", test_nr);
+ pkey_tests[test_nr](ptr, pkey);
+ dprintf1("freeing test memory: %p\n", ptr);
+ free_pkey_malloc(ptr);
+ sys_pkey_free(pkey);
+
+ dprintf1("pkru_faults: %d\n", pkru_faults);
+ dprintf1("orig_pkru_faults: %d\n", orig_pkru_faults);
+
+ tracing_off();
+ close_test_fds();
+
+ printf("test %2d PASSED (iteration %d)\n", test_nr, iteration_nr);
+ dprintf1("======================\n\n");
+ }
+ iteration_nr++;
+}
+
+void pkey_setup_shadow(void)
+{
+ shadow_pkru = __rdpkru();
+}
+
+int main(void)
+{
+ int nr_iterations = 22;
+
+ setup_handlers();
+
+ printf("has pku: %d\n", cpu_has_pku());
+
+ if (!cpu_has_pku()) {
+ int size = PAGE_SIZE;
+ int *ptr;
+
+ printf("running PKEY tests for unsupported CPU/OS\n");
+
+ ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+ test_mprotect_pkey_on_unsupported_cpu(ptr, 1);
+ exit(0);
+ }
+
+ pkey_setup_shadow();
+ printf("startup pkru: %x\n", rdpkru());
+ setup_hugetlbfs();
+
+ while (nr_iterations-- > 0)
+ run_tests_once();
+
+ printf("done (all tests OK)\n");
+ return 0;
+}
diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index 97f187e..fee6181 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -6,7 +6,7 @@ include ../lib.mk

TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt ptrace_syscall test_mremap_vdso \
check_initial_reg_state sigreturn ldt_gdt iopl mpx-mini-test ioperm \
- protection_keys test_vdso
+ test_vdso
TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault test_syscall_vdso unwind_vdso \
test_FCMOV test_FCOMI test_FISTTP \
vdso_restorer
diff --git a/tools/testing/selftests/x86/pkey-helpers.h b/tools/testing/selftests/x86/pkey-helpers.h
deleted file mode 100644
index b202939..0000000
--- a/tools/testing/selftests/x86/pkey-helpers.h
+++ /dev/null
@@ -1,219 +0,0 @@
-#ifndef _PKEYS_HELPER_H
-#define _PKEYS_HELPER_H
-#define _GNU_SOURCE
-#include <string.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <signal.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <ucontext.h>
-#include <sys/mman.h>
-
-#define NR_PKEYS 16
-#define PKRU_BITS_PER_PKEY 2
-
-#ifndef DEBUG_LEVEL
-#define DEBUG_LEVEL 0
-#endif
-#define DPRINT_IN_SIGNAL_BUF_SIZE 4096
-extern int dprint_in_signal;
-extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
-static inline void sigsafe_printf(const char *format, ...)
-{
- va_list ap;
-
- va_start(ap, format);
- if (!dprint_in_signal) {
- vprintf(format, ap);
- } else {
- int len = vsnprintf(dprint_in_signal_buffer,
- DPRINT_IN_SIGNAL_BUF_SIZE,
- format, ap);
- /*
- * len is amount that would have been printed,
- * but actual write is truncated at BUF_SIZE.
- */
- if (len > DPRINT_IN_SIGNAL_BUF_SIZE)
- len = DPRINT_IN_SIGNAL_BUF_SIZE;
- write(1, dprint_in_signal_buffer, len);
- }
- va_end(ap);
-}
-#define dprintf_level(level, args...) do { \
- if (level <= DEBUG_LEVEL) \
- sigsafe_printf(args); \
- fflush(NULL); \
-} while (0)
-#define dprintf0(args...) dprintf_level(0, args)
-#define dprintf1(args...) dprintf_level(1, args)
-#define dprintf2(args...) dprintf_level(2, args)
-#define dprintf3(args...) dprintf_level(3, args)
-#define dprintf4(args...) dprintf_level(4, args)
-
-extern unsigned int shadow_pkru;
-static inline unsigned int __rdpkru(void)
-{
- unsigned int eax, edx;
- unsigned int ecx = 0;
- unsigned int pkru;
-
- asm volatile(".byte 0x0f,0x01,0xee\n\t"
- : "=a" (eax), "=d" (edx)
- : "c" (ecx));
- pkru = eax;
- return pkru;
-}
-
-static inline unsigned int _rdpkru(int line)
-{
- unsigned int pkru = __rdpkru();
-
- dprintf4("rdpkru(line=%d) pkru: %x shadow: %x\n",
- line, pkru, shadow_pkru);
- assert(pkru == shadow_pkru);
-
- return pkru;
-}
-
-#define rdpkru() _rdpkru(__LINE__)
-
-static inline void __wrpkru(unsigned int pkru)
-{
- unsigned int eax = pkru;
- unsigned int ecx = 0;
- unsigned int edx = 0;
-
- dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
- asm volatile(".byte 0x0f,0x01,0xef\n\t"
- : : "a" (eax), "c" (ecx), "d" (edx));
- assert(pkru == __rdpkru());
-}
-
-static inline void wrpkru(unsigned int pkru)
-{
- dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
- /* will do the shadow check for us: */
- rdpkru();
- __wrpkru(pkru);
- shadow_pkru = pkru;
- dprintf4("%s(%08x) pkru: %08x\n", __func__, pkru, __rdpkru());
-}
-
-/*
- * These are technically racy. since something could
- * change PKRU between the read and the write.
- */
-static inline void __pkey_access_allow(int pkey, int do_allow)
-{
- unsigned int pkru = rdpkru();
- int bit = pkey * 2;
-
- if (do_allow)
- pkru &= (1<<bit);
- else
- pkru |= (1<<bit);
-
- dprintf4("pkru now: %08x\n", rdpkru());
- wrpkru(pkru);
-}
-
-static inline void __pkey_write_allow(int pkey, int do_allow_write)
-{
- long pkru = rdpkru();
- int bit = pkey * 2 + 1;
-
- if (do_allow_write)
- pkru &= (1<<bit);
- else
- pkru |= (1<<bit);
-
- wrpkru(pkru);
- dprintf4("pkru now: %08x\n", rdpkru());
-}
-
-#define PROT_PKEY0 0x10 /* protection key value (bit 0) */
-#define PROT_PKEY1 0x20 /* protection key value (bit 1) */
-#define PROT_PKEY2 0x40 /* protection key value (bit 2) */
-#define PROT_PKEY3 0x80 /* protection key value (bit 3) */
-
-#define PAGE_SIZE 4096
-#define MB (1<<20)
-
-static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
- unsigned int *ecx, unsigned int *edx)
-{
- /* ecx is often an input as well as an output. */
- asm volatile(
- "cpuid;"
- : "=a" (*eax),
- "=b" (*ebx),
- "=c" (*ecx),
- "=d" (*edx)
- : "0" (*eax), "2" (*ecx));
-}
-
-/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx) */
-#define X86_FEATURE_PKU (1<<3) /* Protection Keys for Userspace */
-#define X86_FEATURE_OSPKE (1<<4) /* OS Protection Keys Enable */
-
-static inline int cpu_has_pku(void)
-{
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
-
- eax = 0x7;
- ecx = 0x0;
- __cpuid(&eax, &ebx, &ecx, &edx);
-
- if (!(ecx & X86_FEATURE_PKU)) {
- dprintf2("cpu does not have PKU\n");
- return 0;
- }
- if (!(ecx & X86_FEATURE_OSPKE)) {
- dprintf2("cpu does not have OSPKE\n");
- return 0;
- }
- return 1;
-}
-
-#define XSTATE_PKRU_BIT (9)
-#define XSTATE_PKRU 0x200
-
-int pkru_xstate_offset(void)
-{
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- int xstate_offset;
- int xstate_size;
- unsigned long XSTATE_CPUID = 0xd;
- int leaf;
-
- /* assume that XSTATE_PKRU is set in XCR0 */
- leaf = XSTATE_PKRU_BIT;
- {
- eax = XSTATE_CPUID;
- ecx = leaf;
- __cpuid(&eax, &ebx, &ecx, &edx);
-
- if (leaf == XSTATE_PKRU_BIT) {
- xstate_offset = ebx;
- xstate_size = eax;
- }
- }
-
- if (xstate_size == 0) {
- printf("could not find size/offset of PKRU in xsave state\n");
- return 0;
- }
-
- return xstate_offset;
-}
-
-#endif /* _PKEYS_HELPER_H */
diff --git a/tools/testing/selftests/x86/protection_keys.c b/tools/testing/selftests/x86/protection_keys.c
deleted file mode 100644
index 3237bc0..0000000
--- a/tools/testing/selftests/x86/protection_keys.c
+++ /dev/null
@@ -1,1395 +0,0 @@
-/*
- * Tests x86 Memory Protection Keys (see Documentation/x86/protection-keys.txt)
- *
- * There are examples in here of:
- * * how to set protection keys on memory
- * * how to set/clear bits in PKRU (the rights register)
- * * how to handle SEGV_PKRU signals and extract pkey-relevant
- * information from the siginfo
- *
- * Things to add:
- * make sure KSM and KSM COW breaking works
- * prefault pages in at malloc, or not
- * protect MPX bounds tables with protection keys?
- * make sure VMA splitting/merging is working correctly
- * OOMs can destroy mm->mmap (see exit_mmap()), so make sure it is immune to pkeys
- * look for pkey "leaks" where it is still set on a VMA but "freed" back to the kernel
- * do a plain mprotect() to a mprotect_pkey() area and make sure the pkey sticks
- *
- * Compile like this:
- * gcc -o protection_keys -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
- * gcc -m32 -o protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
- */
-#define _GNU_SOURCE
-#include <errno.h>
-#include <linux/futex.h>
-#include <sys/time.h>
-#include <sys/syscall.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <signal.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <ucontext.h>
-#include <sys/mman.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/ptrace.h>
-#include <setjmp.h>
-
-#include "pkey-helpers.h"
-
-int iteration_nr = 1;
-int test_nr;
-
-unsigned int shadow_pkru;
-
-#define HPAGE_SIZE (1UL<<21)
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
-#define ALIGN_UP(x, align_to) (((x) + ((align_to)-1)) & ~((align_to)-1))
-#define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
-#define ALIGN_PTR_UP(p, ptr_align_to) ((typeof(p))ALIGN_UP((unsigned long)(p), ptr_align_to))
-#define ALIGN_PTR_DOWN(p, ptr_align_to) ((typeof(p))ALIGN_DOWN((unsigned long)(p), ptr_align_to))
-#define __stringify_1(x...) #x
-#define __stringify(x...) __stringify_1(x)
-
-#define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
-
-int dprint_in_signal;
-char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
-
-extern void abort_hooks(void);
-#define pkey_assert(condition) do { \
- if (!(condition)) { \
- dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
- __FILE__, __LINE__, \
- test_nr, iteration_nr); \
- dprintf0("errno at assert: %d", errno); \
- abort_hooks(); \
- assert(condition); \
- } \
-} while (0)
-#define raw_assert(cond) assert(cond)
-
-void cat_into_file(char *str, char *file)
-{
- int fd = open(file, O_RDWR);
- int ret;
-
- dprintf2("%s(): writing '%s' to '%s'\n", __func__, str, file);
- /*
- * these need to be raw because they are called under
- * pkey_assert()
- */
- raw_assert(fd >= 0);
- ret = write(fd, str, strlen(str));
- if (ret != strlen(str)) {
- perror("write to file failed");
- fprintf(stderr, "filename: '%s' str: '%s'\n", file, str);
- raw_assert(0);
- }
- close(fd);
-}
-
-#if CONTROL_TRACING > 0
-static int warned_tracing;
-int tracing_root_ok(void)
-{
- if (geteuid() != 0) {
- if (!warned_tracing)
- fprintf(stderr, "WARNING: not run as root, "
- "can not do tracing control\n");
- warned_tracing = 1;
- return 0;
- }
- return 1;
-}
-#endif
-
-void tracing_on(void)
-{
-#if CONTROL_TRACING > 0
-#define TRACEDIR "/sys/kernel/debug/tracing"
- char pidstr[32];
-
- if (!tracing_root_ok())
- return;
-
- sprintf(pidstr, "%d", getpid());
- cat_into_file("0", TRACEDIR "/tracing_on");
- cat_into_file("\n", TRACEDIR "/trace");
- if (1) {
- cat_into_file("function_graph", TRACEDIR "/current_tracer");
- cat_into_file("1", TRACEDIR "/options/funcgraph-proc");
- } else {
- cat_into_file("nop", TRACEDIR "/current_tracer");
- }
- cat_into_file(pidstr, TRACEDIR "/set_ftrace_pid");
- cat_into_file("1", TRACEDIR "/tracing_on");
- dprintf1("enabled tracing\n");
-#endif
-}
-
-void tracing_off(void)
-{
-#if CONTROL_TRACING > 0
- if (!tracing_root_ok())
- return;
- cat_into_file("0", "/sys/kernel/debug/tracing/tracing_on");
-#endif
-}
-
-void abort_hooks(void)
-{
- fprintf(stderr, "running %s()...\n", __func__);
- tracing_off();
-#ifdef SLEEP_ON_ABORT
- sleep(SLEEP_ON_ABORT);
-#endif
-}
-
-static inline void __page_o_noops(void)
-{
- /* 8-bytes of instruction * 512 bytes = 1 page */
- asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr");
-}
-
-/*
- * This attempts to have roughly a page of instructions followed by a few
- * instructions that do a write, and another page of instructions. That
- * way, we are pretty sure that the write is in the second page of
- * instructions and has at least a page of padding behind it.
- *
- * *That* lets us be sure to madvise() away the write instruction, which
- * will then fault, which makes sure that the fault code handles
- * execute-only memory properly.
- */
-__attribute__((__aligned__(PAGE_SIZE)))
-void lots_o_noops_around_write(int *write_to_me)
-{
- dprintf3("running %s()\n", __func__);
- __page_o_noops();
- /* Assume this happens in the second page of instructions: */
- *write_to_me = __LINE__;
- /* pad out by another page: */
- __page_o_noops();
- dprintf3("%s() done\n", __func__);
-}
-
-/* Define some kernel-like types */
-#define u8 uint8_t
-#define u16 uint16_t
-#define u32 uint32_t
-#define u64 uint64_t
-
-#ifdef __i386__
-#define SYS_mprotect_key 380
-#define SYS_pkey_alloc 381
-#define SYS_pkey_free 382
-#define REG_IP_IDX REG_EIP
-#define si_pkey_offset 0x14
-#else
-#define SYS_mprotect_key 329
-#define SYS_pkey_alloc 330
-#define SYS_pkey_free 331
-#define REG_IP_IDX REG_RIP
-#define si_pkey_offset 0x20
-#endif
-
-void dump_mem(void *dumpme, int len_bytes)
-{
- char *c = (void *)dumpme;
- int i;
-
- for (i = 0; i < len_bytes; i += sizeof(u64)) {
- u64 *ptr = (u64 *)(c + i);
- dprintf1("dump[%03d][@%p]: %016jx\n", i, ptr, *ptr);
- }
-}
-
-#define __SI_FAULT (3 << 16)
-#define SEGV_BNDERR (__SI_FAULT|3) /* failed address bound checks */
-#define SEGV_PKUERR (__SI_FAULT|4)
-
-static char *si_code_str(int si_code)
-{
- if (si_code & SEGV_MAPERR)
- return "SEGV_MAPERR";
- if (si_code & SEGV_ACCERR)
- return "SEGV_ACCERR";
- if (si_code & SEGV_BNDERR)
- return "SEGV_BNDERR";
- if (si_code & SEGV_PKUERR)
- return "SEGV_PKUERR";
- return "UNKNOWN";
-}
-
-int pkru_faults;
-int last_si_pkey = -1;
-void signal_handler(int signum, siginfo_t *si, void *vucontext)
-{
- ucontext_t *uctxt = vucontext;
- int trapno;
- unsigned long ip;
- char *fpregs;
- u32 *pkru_ptr;
- u64 si_pkey;
- u32 *si_pkey_ptr;
- int pkru_offset;
- fpregset_t fpregset;
-
- dprint_in_signal = 1;
- dprintf1(">>>>===============SIGSEGV============================\n");
- dprintf1("%s()::%d, pkru: 0x%x shadow: %x\n", __func__, __LINE__,
- __rdpkru(), shadow_pkru);
-
- trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
- ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
- fpregset = uctxt->uc_mcontext.fpregs;
- fpregs = (void *)fpregset;
-
- dprintf2("%s() trapno: %d ip: 0x%lx info->si_code: %s/%d\n", __func__,
- trapno, ip, si_code_str(si->si_code), si->si_code);
-#ifdef __i386__
- /*
- * 32-bit has some extra padding so that userspace can tell whether
- * the XSTATE header is present in addition to the "legacy" FPU
- * state. We just assume that it is here.
- */
- fpregs += 0x70;
-#endif
- pkru_offset = pkru_xstate_offset();
- pkru_ptr = (void *)(&fpregs[pkru_offset]);
-
- dprintf1("siginfo: %p\n", si);
- dprintf1(" fpregs: %p\n", fpregs);
- /*
- * If we got a PKRU fault, we *HAVE* to have at least one bit set in
- * here.
- */
- dprintf1("pkru_xstate_offset: %d\n", pkru_xstate_offset());
- if (DEBUG_LEVEL > 4)
- dump_mem(pkru_ptr - 128, 256);
- pkey_assert(*pkru_ptr);
-
- si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
- dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
- dump_mem(si_pkey_ptr - 8, 24);
- si_pkey = *si_pkey_ptr;
- pkey_assert(si_pkey < NR_PKEYS);
- last_si_pkey = si_pkey;
-
- if ((si->si_code == SEGV_MAPERR) ||
- (si->si_code == SEGV_ACCERR) ||
- (si->si_code == SEGV_BNDERR)) {
- printf("non-PK si_code, exiting...\n");
- exit(4);
- }
-
- dprintf1("signal pkru from xsave: %08x\n", *pkru_ptr);
- /* need __rdpkru() version so we do not do shadow_pkru checking */
- dprintf1("signal pkru from pkru: %08x\n", __rdpkru());
- dprintf1("si_pkey from siginfo: %jx\n", si_pkey);
- *(u64 *)pkru_ptr = 0x00000000;
- dprintf1("WARNING: set PRKU=0 to allow faulting instruction to continue\n");
- pkru_faults++;
- dprintf1("<<<<==================================================\n");
- return;
- if (trapno == 14) {
- fprintf(stderr,
- "ERROR: In signal handler, page fault, trapno = %d, ip = %016lx\n",
- trapno, ip);
- fprintf(stderr, "si_addr %p\n", si->si_addr);
- fprintf(stderr, "REG_ERR: %lx\n",
- (unsigned long)uctxt->uc_mcontext.gregs[REG_ERR]);
- exit(1);
- } else {
- fprintf(stderr, "unexpected trap %d! at 0x%lx\n", trapno, ip);
- fprintf(stderr, "si_addr %p\n", si->si_addr);
- fprintf(stderr, "REG_ERR: %lx\n",
- (unsigned long)uctxt->uc_mcontext.gregs[REG_ERR]);
- exit(2);
- }
- dprint_in_signal = 0;
-}
-
-int wait_all_children(void)
-{
- int status;
- return waitpid(-1, &status, 0);
-}
-
-void sig_chld(int x)
-{
- dprint_in_signal = 1;
- dprintf2("[%d] SIGCHLD: %d\n", getpid(), x);
- dprint_in_signal = 0;
-}
-
-void setup_sigsegv_handler(void)
-{
- int r, rs;
- struct sigaction newact;
- struct sigaction oldact;
-
- /* #PF is mapped to sigsegv */
- int signum = SIGSEGV;
-
- newact.sa_handler = 0;
- newact.sa_sigaction = signal_handler;
-
- /*sigset_t - signals to block while in the handler */
- /* get the old signal mask. */
- rs = sigprocmask(SIG_SETMASK, 0, &newact.sa_mask);
- pkey_assert(rs == 0);
-
- /* call sa_sigaction, not sa_handler*/
- newact.sa_flags = SA_SIGINFO;
-
- newact.sa_restorer = 0; /* void(*)(), obsolete */
- r = sigaction(signum, &newact, &oldact);
- r = sigaction(SIGALRM, &newact, &oldact);
- pkey_assert(r == 0);
-}
-
-void setup_handlers(void)
-{
- signal(SIGCHLD, &sig_chld);
- setup_sigsegv_handler();
-}
-
-pid_t fork_lazy_child(void)
-{
- pid_t forkret;
-
- forkret = fork();
- pkey_assert(forkret >= 0);
- dprintf3("[%d] fork() ret: %d\n", getpid(), forkret);
-
- if (!forkret) {
- /* in the child */
- while (1) {
- dprintf1("child sleeping...\n");
- sleep(30);
- }
- }
- return forkret;
-}
-
-void davecmp(void *_a, void *_b, int len)
-{
- int i;
- unsigned long *a = _a;
- unsigned long *b = _b;
-
- for (i = 0; i < len / sizeof(*a); i++) {
- if (a[i] == b[i])
- continue;
-
- dprintf3("[%3d]: a: %016lx b: %016lx\n", i, a[i], b[i]);
- }
-}
-
-void dumpit(char *f)
-{
- int fd = open(f, O_RDONLY);
- char buf[100];
- int nr_read;
-
- dprintf2("maps fd: %d\n", fd);
- do {
- nr_read = read(fd, &buf[0], sizeof(buf));
- write(1, buf, nr_read);
- } while (nr_read > 0);
- close(fd);
-}
-
-#define PKEY_DISABLE_ACCESS 0x1
-#define PKEY_DISABLE_WRITE 0x2
-
-u32 pkey_get(int pkey, unsigned long flags)
-{
- u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
- u32 pkru = __rdpkru();
- u32 shifted_pkru;
- u32 masked_pkru;
-
- dprintf1("%s(pkey=%d, flags=%lx) = %x / %d\n",
- __func__, pkey, flags, 0, 0);
- dprintf2("%s() raw pkru: %x\n", __func__, pkru);
-
- shifted_pkru = (pkru >> (pkey * PKRU_BITS_PER_PKEY));
- dprintf2("%s() shifted_pkru: %x\n", __func__, shifted_pkru);
- masked_pkru = shifted_pkru & mask;
- dprintf2("%s() masked pkru: %x\n", __func__, masked_pkru);
- /*
- * shift down the relevant bits to the lowest two, then
- * mask off all the other high bits.
- */
- return masked_pkru;
-}
-
-int pkey_set(int pkey, unsigned long rights, unsigned long flags)
-{
- u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
- u32 old_pkru = __rdpkru();
- u32 new_pkru;
-
- /* make sure that 'rights' only contains the bits we expect: */
- assert(!(rights & ~mask));
-
- /* copy old pkru */
- new_pkru = old_pkru;
- /* mask out bits from pkey in old value: */
- new_pkru &= ~(mask << (pkey * PKRU_BITS_PER_PKEY));
- /* OR in new bits for pkey: */
- new_pkru |= (rights << (pkey * PKRU_BITS_PER_PKEY));
-
- __wrpkru(new_pkru);
-
- dprintf3("%s(pkey=%d, rights=%lx, flags=%lx) = %x pkru now: %x old_pkru: %x\n",
- __func__, pkey, rights, flags, 0, __rdpkru(), old_pkru);
- return 0;
-}
-
-void pkey_disable_set(int pkey, int flags)
-{
- unsigned long syscall_flags = 0;
- int ret;
- int pkey_rights;
- u32 orig_pkru = rdpkru();
-
- dprintf1("START->%s(%d, 0x%x)\n", __func__,
- pkey, flags);
- pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
-
- pkey_rights = pkey_get(pkey, syscall_flags);
-
- dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
- pkey, pkey, pkey_rights);
- pkey_assert(pkey_rights >= 0);
-
- pkey_rights |= flags;
-
- ret = pkey_set(pkey, pkey_rights, syscall_flags);
- assert(!ret);
- /*pkru and flags have the same format */
- shadow_pkru |= flags << (pkey * 2);
- dprintf1("%s(%d) shadow: 0x%x\n", __func__, pkey, shadow_pkru);
-
- pkey_assert(ret >= 0);
-
- pkey_rights = pkey_get(pkey, syscall_flags);
- dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
- pkey, pkey, pkey_rights);
-
- dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
- if (flags)
- pkey_assert(rdpkru() > orig_pkru);
- dprintf1("END<---%s(%d, 0x%x)\n", __func__,
- pkey, flags);
-}
-
-void pkey_disable_clear(int pkey, int flags)
-{
- unsigned long syscall_flags = 0;
- int ret;
- int pkey_rights = pkey_get(pkey, syscall_flags);
- u32 orig_pkru = rdpkru();
-
- pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
-
- dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
- pkey, pkey, pkey_rights);
- pkey_assert(pkey_rights >= 0);
-
- pkey_rights |= flags;
-
- ret = pkey_set(pkey, pkey_rights, 0);
- /* pkru and flags have the same format */
- shadow_pkru &= ~(flags << (pkey * 2));
- pkey_assert(ret >= 0);
-
- pkey_rights = pkey_get(pkey, syscall_flags);
- dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
- pkey, pkey, pkey_rights);
-
- dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
- if (flags)
- assert(rdpkru() > orig_pkru);
-}
-
-void pkey_write_allow(int pkey)
-{
- pkey_disable_clear(pkey, PKEY_DISABLE_WRITE);
-}
-void pkey_write_deny(int pkey)
-{
- pkey_disable_set(pkey, PKEY_DISABLE_WRITE);
-}
-void pkey_access_allow(int pkey)
-{
- pkey_disable_clear(pkey, PKEY_DISABLE_ACCESS);
-}
-void pkey_access_deny(int pkey)
-{
- pkey_disable_set(pkey, PKEY_DISABLE_ACCESS);
-}
-
-int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
- unsigned long pkey)
-{
- int sret;
-
- dprintf2("%s(0x%p, %zx, prot=%lx, pkey=%lx)\n", __func__,
- ptr, size, orig_prot, pkey);
-
- errno = 0;
- sret = syscall(SYS_mprotect_key, ptr, size, orig_prot, pkey);
- if (errno) {
- dprintf2("SYS_mprotect_key sret: %d\n", sret);
- dprintf2("SYS_mprotect_key prot: 0x%lx\n", orig_prot);
- dprintf2("SYS_mprotect_key failed, errno: %d\n", errno);
- if (DEBUG_LEVEL >= 2)
- perror("SYS_mprotect_pkey");
- }
- return sret;
-}
-
-int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
-{
- int ret = syscall(SYS_pkey_alloc, flags, init_val);
- dprintf1("%s(flags=%lx, init_val=%lx) syscall ret: %d errno: %d\n",
- __func__, flags, init_val, ret, errno);
- return ret;
-}
-
-int alloc_pkey(void)
-{
- int ret;
- unsigned long init_val = 0x0;
-
- dprintf1("alloc_pkey()::%d, pkru: 0x%x shadow: %x\n",
- __LINE__, __rdpkru(), shadow_pkru);
- ret = sys_pkey_alloc(0, init_val);
- /*
- * pkey_alloc() sets PKRU, so we need to reflect it in
- * shadow_pkru:
- */
- dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
- __LINE__, ret, __rdpkru(), shadow_pkru);
- if (ret) {
- /* clear both the bits: */
- shadow_pkru &= ~(0x3 << (ret * 2));
- dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
- __LINE__, ret, __rdpkru(), shadow_pkru);
- /*
- * move the new state in from init_val
- * (remember, we cheated and init_val == pkru format)
- */
- shadow_pkru |= (init_val << (ret * 2));
- }
- dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
- __LINE__, ret, __rdpkru(), shadow_pkru);
- dprintf1("alloc_pkey()::%d errno: %d\n", __LINE__, errno);
- /* for shadow checking: */
- rdpkru();
- dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
- __LINE__, ret, __rdpkru(), shadow_pkru);
- return ret;
-}
-
-int sys_pkey_free(unsigned long pkey)
-{
- int ret = syscall(SYS_pkey_free, pkey);
- dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret);
- return ret;
-}
-
-/*
- * I had a bug where pkey bits could be set by mprotect() but
- * not cleared. This ensures we get lots of random bit sets
- * and clears on the vma and pte pkey bits.
- */
-int alloc_random_pkey(void)
-{
- int max_nr_pkey_allocs;
- int ret;
- int i;
- int alloced_pkeys[NR_PKEYS];
- int nr_alloced = 0;
- int random_index;
- memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
-
- /* allocate every possible key and make a note of which ones we got */
- max_nr_pkey_allocs = NR_PKEYS;
- max_nr_pkey_allocs = 1;
- for (i = 0; i < max_nr_pkey_allocs; i++) {
- int new_pkey = alloc_pkey();
- if (new_pkey < 0)
- break;
- alloced_pkeys[nr_alloced++] = new_pkey;
- }
-
- pkey_assert(nr_alloced > 0);
- /* select a random one out of the allocated ones */
- random_index = rand() % nr_alloced;
- ret = alloced_pkeys[random_index];
- /* now zero it out so we don't free it next */
- alloced_pkeys[random_index] = 0;
-
- /* go through the allocated ones that we did not want and free them */
- for (i = 0; i < nr_alloced; i++) {
- int free_ret;
- if (!alloced_pkeys[i])
- continue;
- free_ret = sys_pkey_free(alloced_pkeys[i]);
- pkey_assert(!free_ret);
- }
- dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
- __LINE__, ret, __rdpkru(), shadow_pkru);
- return ret;
-}
-
-int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
- unsigned long pkey)
-{
- int nr_iterations = random() % 100;
- int ret;
-
- while (0) {
- int rpkey = alloc_random_pkey();
- ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
- dprintf1("sys_mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
- ptr, size, orig_prot, pkey, ret);
- if (nr_iterations-- < 0)
- break;
-
- dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
- __LINE__, ret, __rdpkru(), shadow_pkru);
- sys_pkey_free(rpkey);
- dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
- __LINE__, ret, __rdpkru(), shadow_pkru);
- }
- pkey_assert(pkey < NR_PKEYS);
-
- ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
- dprintf1("mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
- ptr, size, orig_prot, pkey, ret);
- pkey_assert(!ret);
- dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
- __LINE__, ret, __rdpkru(), shadow_pkru);
- return ret;
-}
-
-struct pkey_malloc_record {
- void *ptr;
- long size;
-};
-struct pkey_malloc_record *pkey_malloc_records;
-long nr_pkey_malloc_records;
-void record_pkey_malloc(void *ptr, long size)
-{
- long i;
- struct pkey_malloc_record *rec = NULL;
-
- for (i = 0; i < nr_pkey_malloc_records; i++) {
- rec = &pkey_malloc_records[i];
- /* find a free record */
- if (rec)
- break;
- }
- if (!rec) {
- /* every record is full */
- size_t old_nr_records = nr_pkey_malloc_records;
- size_t new_nr_records = (nr_pkey_malloc_records * 2 + 1);
- size_t new_size = new_nr_records * sizeof(struct pkey_malloc_record);
- dprintf2("new_nr_records: %zd\n", new_nr_records);
- dprintf2("new_size: %zd\n", new_size);
- pkey_malloc_records = realloc(pkey_malloc_records, new_size);
- pkey_assert(pkey_malloc_records != NULL);
- rec = &pkey_malloc_records[nr_pkey_malloc_records];
- /*
- * realloc() does not initialize memory, so zero it from
- * the first new record all the way to the end.
- */
- for (i = 0; i < new_nr_records - old_nr_records; i++)
- memset(rec + i, 0, sizeof(*rec));
- }
- dprintf3("filling malloc record[%d/%p]: {%p, %ld}\n",
- (int)(rec - pkey_malloc_records), rec, ptr, size);
- rec->ptr = ptr;
- rec->size = size;
- nr_pkey_malloc_records++;
-}
-
-void free_pkey_malloc(void *ptr)
-{
- long i;
- int ret;
- dprintf3("%s(%p)\n", __func__, ptr);
- for (i = 0; i < nr_pkey_malloc_records; i++) {
- struct pkey_malloc_record *rec = &pkey_malloc_records[i];
- dprintf4("looking for ptr %p at record[%ld/%p]: {%p, %ld}\n",
- ptr, i, rec, rec->ptr, rec->size);
- if ((ptr < rec->ptr) ||
- (ptr >= rec->ptr + rec->size))
- continue;
-
- dprintf3("found ptr %p at record[%ld/%p]: {%p, %ld}\n",
- ptr, i, rec, rec->ptr, rec->size);
- nr_pkey_malloc_records--;
- ret = munmap(rec->ptr, rec->size);
- dprintf3("munmap ret: %d\n", ret);
- pkey_assert(!ret);
- dprintf3("clearing rec->ptr, rec: %p\n", rec);
- rec->ptr = NULL;
- dprintf3("done clearing rec->ptr, rec: %p\n", rec);
- return;
- }
- pkey_assert(false);
-}
-
-
-void *malloc_pkey_with_mprotect(long size, int prot, u16 pkey)
-{
- void *ptr;
- int ret;
-
- rdpkru();
- dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
- size, prot, pkey);
- pkey_assert(pkey < NR_PKEYS);
- ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
- pkey_assert(ptr != (void *)-1);
- ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
- pkey_assert(!ret);
- record_pkey_malloc(ptr, size);
- rdpkru();
-
- dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
- return ptr;
-}
-
-void *malloc_pkey_anon_huge(long size, int prot, u16 pkey)
-{
- int ret;
- void *ptr;
-
- dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
- size, prot, pkey);
- /*
- * Guarantee we can fit at least one huge page in the resulting
- * allocation by allocating space for 2:
- */
- size = ALIGN_UP(size, HPAGE_SIZE * 2);
- ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
- pkey_assert(ptr != (void *)-1);
- record_pkey_malloc(ptr, size);
- mprotect_pkey(ptr, size, prot, pkey);
-
- dprintf1("unaligned ptr: %p\n", ptr);
- ptr = ALIGN_PTR_UP(ptr, HPAGE_SIZE);
- dprintf1(" aligned ptr: %p\n", ptr);
- ret = madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE);
- dprintf1("MADV_HUGEPAGE ret: %d\n", ret);
- ret = madvise(ptr, HPAGE_SIZE, MADV_WILLNEED);
- dprintf1("MADV_WILLNEED ret: %d\n", ret);
- memset(ptr, 0, HPAGE_SIZE);
-
- dprintf1("mmap()'d thp for pkey %d @ %p\n", pkey, ptr);
- return ptr;
-}
-
-int hugetlb_setup_ok;
-#define GET_NR_HUGE_PAGES 10
-void setup_hugetlbfs(void)
-{
- int err;
- int fd;
- char buf[] = "123";
-
- if (geteuid() != 0) {
- fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
- return;
- }
-
- cat_into_file(__stringify(GET_NR_HUGE_PAGES), "/proc/sys/vm/nr_hugepages");
-
- /*
- * Now go make sure that we got the pages and that they
- * are 2M pages. Someone might have made 1G the default.
- */
- fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
- if (fd < 0) {
- perror("opening sysfs 2M hugetlb config");
- return;
- }
-
- /* -1 to guarantee leaving the trailing \0 */
- err = read(fd, buf, sizeof(buf)-1);
- close(fd);
- if (err <= 0) {
- perror("reading sysfs 2M hugetlb config");
- return;
- }
-
- if (atoi(buf) != GET_NR_HUGE_PAGES) {
- fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
- buf, GET_NR_HUGE_PAGES);
- return;
- }
-
- hugetlb_setup_ok = 1;
-}
-
-void *malloc_pkey_hugetlb(long size, int prot, u16 pkey)
-{
- void *ptr;
- int flags = MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB;
-
- if (!hugetlb_setup_ok)
- return PTR_ERR_ENOTSUP;
-
- dprintf1("doing %s(%ld, %x, %x)\n", __func__, size, prot, pkey);
- size = ALIGN_UP(size, HPAGE_SIZE * 2);
- pkey_assert(pkey < NR_PKEYS);
- ptr = mmap(NULL, size, PROT_NONE, flags, -1, 0);
- pkey_assert(ptr != (void *)-1);
- mprotect_pkey(ptr, size, prot, pkey);
-
- record_pkey_malloc(ptr, size);
-
- dprintf1("mmap()'d hugetlbfs for pkey %d @ %p\n", pkey, ptr);
- return ptr;
-}
-
-void *malloc_pkey_mmap_dax(long size, int prot, u16 pkey)
-{
- void *ptr;
- int fd;
-
- dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
- size, prot, pkey);
- pkey_assert(pkey < NR_PKEYS);
- fd = open("/dax/foo", O_RDWR);
- pkey_assert(fd >= 0);
-
- ptr = mmap(0, size, prot, MAP_SHARED, fd, 0);
- pkey_assert(ptr != (void *)-1);
-
- mprotect_pkey(ptr, size, prot, pkey);
-
- record_pkey_malloc(ptr, size);
-
- dprintf1("mmap()'d for pkey %d @ %p\n", pkey, ptr);
- close(fd);
- return ptr;
-}
-
-void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {
-
- malloc_pkey_with_mprotect,
- malloc_pkey_anon_huge,
- malloc_pkey_hugetlb
-/* can not do direct with the pkey_mprotect() API:
- malloc_pkey_mmap_direct,
- malloc_pkey_mmap_dax,
-*/
-};
-
-void *malloc_pkey(long size, int prot, u16 pkey)
-{
- void *ret;
- static int malloc_type;
- int nr_malloc_types = ARRAY_SIZE(pkey_malloc);
-
- pkey_assert(pkey < NR_PKEYS);
-
- while (1) {
- pkey_assert(malloc_type < nr_malloc_types);
-
- ret = pkey_malloc[malloc_type](size, prot, pkey);
- pkey_assert(ret != (void *)-1);
-
- malloc_type++;
- if (malloc_type >= nr_malloc_types)
- malloc_type = (random()%nr_malloc_types);
-
- /* try again if the malloc_type we tried is unsupported */
- if (ret == PTR_ERR_ENOTSUP)
- continue;
-
- break;
- }
-
- dprintf3("%s(%ld, prot=%x, pkey=%x) returning: %p\n", __func__,
- size, prot, pkey, ret);
- return ret;
-}
-
-int last_pkru_faults;
-void expected_pk_fault(int pkey)
-{
- dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
- __func__, last_pkru_faults, pkru_faults);
- dprintf2("%s(%d): last_si_pkey: %d\n", __func__, pkey, last_si_pkey);
- pkey_assert(last_pkru_faults + 1 == pkru_faults);
- pkey_assert(last_si_pkey == pkey);
- /*
- * The signal handler shold have cleared out PKRU to let the
- * test program continue. We now have to restore it.
- */
- if (__rdpkru() != 0)
- pkey_assert(0);
-
- __wrpkru(shadow_pkru);
- dprintf1("%s() set PKRU=%x to restore state after signal nuked it\n",
- __func__, shadow_pkru);
- last_pkru_faults = pkru_faults;
- last_si_pkey = -1;
-}
-
-void do_not_expect_pk_fault(void)
-{
- pkey_assert(last_pkru_faults == pkru_faults);
-}
-
-int test_fds[10] = { -1 };
-int nr_test_fds;
-void __save_test_fd(int fd)
-{
- pkey_assert(fd >= 0);
- pkey_assert(nr_test_fds < ARRAY_SIZE(test_fds));
- test_fds[nr_test_fds] = fd;
- nr_test_fds++;
-}
-
-int get_test_read_fd(void)
-{
- int test_fd = open("/etc/passwd", O_RDONLY);
- __save_test_fd(test_fd);
- return test_fd;
-}
-
-void close_test_fds(void)
-{
- int i;
-
- for (i = 0; i < nr_test_fds; i++) {
- if (test_fds[i] < 0)
- continue;
- close(test_fds[i]);
- test_fds[i] = -1;
- }
- nr_test_fds = 0;
-}
-
-#define barrier() __asm__ __volatile__("": : :"memory")
-__attribute__((noinline)) int read_ptr(int *ptr)
-{
- /*
- * Keep GCC from optimizing this away somehow
- */
- barrier();
- return *ptr;
-}
-
-void test_read_of_write_disabled_region(int *ptr, u16 pkey)
-{
- int ptr_contents;
-
- dprintf1("disabling write access to PKEY[1], doing read\n");
- pkey_write_deny(pkey);
- ptr_contents = read_ptr(ptr);
- dprintf1("*ptr: %d\n", ptr_contents);
- dprintf1("\n");
-}
-void test_read_of_access_disabled_region(int *ptr, u16 pkey)
-{
- int ptr_contents;
-
- dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", pkey, ptr);
- rdpkru();
- pkey_access_deny(pkey);
- ptr_contents = read_ptr(ptr);
- dprintf1("*ptr: %d\n", ptr_contents);
- expected_pk_fault(pkey);
-}
-void test_write_of_write_disabled_region(int *ptr, u16 pkey)
-{
- dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
- pkey_write_deny(pkey);
- *ptr = __LINE__;
- expected_pk_fault(pkey);
-}
-void test_write_of_access_disabled_region(int *ptr, u16 pkey)
-{
- dprintf1("disabling access to PKEY[%02d], doing write\n", pkey);
- pkey_access_deny(pkey);
- *ptr = __LINE__;
- expected_pk_fault(pkey);
-}
-void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
-{
- int ret;
- int test_fd = get_test_read_fd();
-
- dprintf1("disabling access to PKEY[%02d], "
- "having kernel read() to buffer\n", pkey);
- pkey_access_deny(pkey);
- ret = read(test_fd, ptr, 1);
- dprintf1("read ret: %d\n", ret);
- pkey_assert(ret);
-}
-void test_kernel_write_of_write_disabled_region(int *ptr, u16 pkey)
-{
- int ret;
- int test_fd = get_test_read_fd();
-
- pkey_write_deny(pkey);
- ret = read(test_fd, ptr, 100);
- dprintf1("read ret: %d\n", ret);
- if (ret < 0 && (DEBUG_LEVEL > 0))
- perror("verbose read result (OK for this to be bad)");
- pkey_assert(ret);
-}
-
-void test_kernel_gup_of_access_disabled_region(int *ptr, u16 pkey)
-{
- int pipe_ret, vmsplice_ret;
- struct iovec iov;
- int pipe_fds[2];
-
- pipe_ret = pipe(pipe_fds);
-
- pkey_assert(pipe_ret == 0);
- dprintf1("disabling access to PKEY[%02d], "
- "having kernel vmsplice from buffer\n", pkey);
- pkey_access_deny(pkey);
- iov.iov_base = ptr;
- iov.iov_len = PAGE_SIZE;
- vmsplice_ret = vmsplice(pipe_fds[1], &iov, 1, SPLICE_F_GIFT);
- dprintf1("vmsplice() ret: %d\n", vmsplice_ret);
- pkey_assert(vmsplice_ret == -1);
-
- close(pipe_fds[0]);
- close(pipe_fds[1]);
-}
-
-void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
-{
- int ignored = 0xdada;
- int futex_ret;
- int some_int = __LINE__;
-
- dprintf1("disabling write to PKEY[%02d], "
- "doing futex gunk in buffer\n", pkey);
- *ptr = some_int;
- pkey_write_deny(pkey);
- futex_ret = syscall(SYS_futex, ptr, FUTEX_WAIT, some_int-1, NULL,
- &ignored, ignored);
- if (DEBUG_LEVEL > 0)
- perror("futex");
- dprintf1("futex() ret: %d\n", futex_ret);
-}
-
-/* Assumes that all pkeys other than 'pkey' are unallocated */
-void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
-{
- int err;
- int i;
-
- /* Note: 0 is the default pkey, so don't mess with it */
- for (i = 1; i < NR_PKEYS; i++) {
- if (pkey == i)
- continue;
-
- dprintf1("trying get/set/free to non-allocated pkey: %2d\n", i);
- err = sys_pkey_free(i);
- pkey_assert(err);
-
- err = sys_pkey_free(i);
- pkey_assert(err);
-
- err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, i);
- pkey_assert(err);
- }
-}
-
-/* Assumes that all pkeys other than 'pkey' are unallocated */
-void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
-{
- int err;
- int bad_pkey = NR_PKEYS+99;
-
- /* pass a known-invalid pkey in: */
- err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, bad_pkey);
- pkey_assert(err);
-}
-
-/* Assumes that all pkeys other than 'pkey' are unallocated */
-void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
-{
- int err;
- int allocated_pkeys[NR_PKEYS] = {0};
- int nr_allocated_pkeys = 0;
- int i;
-
- for (i = 0; i < NR_PKEYS*2; i++) {
- int new_pkey;
- dprintf1("%s() alloc loop: %d\n", __func__, i);
- new_pkey = alloc_pkey();
- dprintf4("%s()::%d, err: %d pkru: 0x%x shadow: 0x%x\n", __func__,
- __LINE__, err, __rdpkru(), shadow_pkru);
- rdpkru(); /* for shadow checking */
- dprintf2("%s() errno: %d ENOSPC: %d\n", __func__, errno, ENOSPC);
- if ((new_pkey == -1) && (errno == ENOSPC)) {
- dprintf2("%s() failed to allocate pkey after %d tries\n",
- __func__, nr_allocated_pkeys);
- break;
- }
- pkey_assert(nr_allocated_pkeys < NR_PKEYS);
- allocated_pkeys[nr_allocated_pkeys++] = new_pkey;
- }
-
- dprintf3("%s()::%d\n", __func__, __LINE__);
-
- /*
- * ensure it did not reach the end of the loop without
- * failure:
- */
- pkey_assert(i < NR_PKEYS*2);
-
- /*
- * There are 16 pkeys supported in hardware. One is taken
- * up for the default (0) and another can be taken up by
- * an execute-only mapping. Ensure that we can allocate
- * at least 14 (16-2).
- */
- pkey_assert(i >= NR_PKEYS-2);
-
- for (i = 0; i < nr_allocated_pkeys; i++) {
- err = sys_pkey_free(allocated_pkeys[i]);
- pkey_assert(!err);
- rdpkru(); /* for shadow checking */
- }
-}
-
-void test_ptrace_of_child(int *ptr, u16 pkey)
-{
- __attribute__((__unused__)) int peek_result;
- pid_t child_pid;
- void *ignored = 0;
- long ret;
- int status;
- /*
- * This is the "control" for our little expermient. Make sure
- * we can always access it when ptracing.
- */
- int *plain_ptr_unaligned = malloc(HPAGE_SIZE);
- int *plain_ptr = ALIGN_PTR_UP(plain_ptr_unaligned, PAGE_SIZE);
-
- /*
- * Fork a child which is an exact copy of this process, of course.
- * That means we can do all of our tests via ptrace() and then plain
- * memory access and ensure they work differently.
- */
- child_pid = fork_lazy_child();
- dprintf1("[%d] child pid: %d\n", getpid(), child_pid);
-
- ret = ptrace(PTRACE_ATTACH, child_pid, ignored, ignored);
- if (ret)
- perror("attach");
- dprintf1("[%d] attach ret: %ld %d\n", getpid(), ret, __LINE__);
- pkey_assert(ret != -1);
- ret = waitpid(child_pid, &status, WUNTRACED);
- if ((ret != child_pid) || !(WIFSTOPPED(status))) {
- fprintf(stderr, "weird waitpid result %ld stat %x\n",
- ret, status);
- pkey_assert(0);
- }
- dprintf2("waitpid ret: %ld\n", ret);
- dprintf2("waitpid status: %d\n", status);
-
- pkey_access_deny(pkey);
- pkey_write_deny(pkey);
-
- /* Write access, untested for now:
- ret = ptrace(PTRACE_POKEDATA, child_pid, peek_at, data);
- pkey_assert(ret != -1);
- dprintf1("poke at %p: %ld\n", peek_at, ret);
- */
-
- /*
- * Try to access the pkey-protected "ptr" via ptrace:
- */
- ret = ptrace(PTRACE_PEEKDATA, child_pid, ptr, ignored);
- /* expect it to work, without an error: */
- pkey_assert(ret != -1);
- /* Now access from the current task, and expect an exception: */
- peek_result = read_ptr(ptr);
- expected_pk_fault(pkey);
-
- /*
- * Try to access the NON-pkey-protected "plain_ptr" via ptrace:
- */
- ret = ptrace(PTRACE_PEEKDATA, child_pid, plain_ptr, ignored);
- /* expect it to work, without an error: */
- pkey_assert(ret != -1);
- /* Now access from the current task, and expect NO exception: */
- peek_result = read_ptr(plain_ptr);
- do_not_expect_pk_fault();
-
- ret = ptrace(PTRACE_DETACH, child_pid, ignored, 0);
- pkey_assert(ret != -1);
-
- ret = kill(child_pid, SIGKILL);
- pkey_assert(ret != -1);
-
- wait(&status);
-
- free(plain_ptr_unaligned);
-}
-
-void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
-{
- void *p1;
- int scratch;
- int ptr_contents;
- int ret;
-
- p1 = ALIGN_PTR_UP(&lots_o_noops_around_write, PAGE_SIZE);
- dprintf3("&lots_o_noops: %p\n", &lots_o_noops_around_write);
- /* lots_o_noops_around_write should be page-aligned already */
- assert(p1 == &lots_o_noops_around_write);
-
- /* Point 'p1' at the *second* page of the function: */
- p1 += PAGE_SIZE;
-
- madvise(p1, PAGE_SIZE, MADV_DONTNEED);
- lots_o_noops_around_write(&scratch);
- ptr_contents = read_ptr(p1);
- dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
-
- ret = mprotect_pkey(p1, PAGE_SIZE, PROT_EXEC, (u64)pkey);
- pkey_assert(!ret);
- pkey_access_deny(pkey);
-
- dprintf2("pkru: %x\n", rdpkru());
-
- /*
- * Make sure this is an *instruction* fault
- */
- madvise(p1, PAGE_SIZE, MADV_DONTNEED);
- lots_o_noops_around_write(&scratch);
- do_not_expect_pk_fault();
- ptr_contents = read_ptr(p1);
- dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
- expected_pk_fault(pkey);
-}
-
-void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
-{
- int size = PAGE_SIZE;
- int sret;
-
- if (cpu_has_pku()) {
- dprintf1("SKIP: %s: no CPU support\n", __func__);
- return;
- }
-
- sret = syscall(SYS_mprotect_key, ptr, size, PROT_READ, pkey);
- pkey_assert(sret < 0);
-}
-
-void (*pkey_tests[])(int *ptr, u16 pkey) = {
- test_read_of_write_disabled_region,
- test_read_of_access_disabled_region,
- test_write_of_write_disabled_region,
- test_write_of_access_disabled_region,
- test_kernel_write_of_access_disabled_region,
- test_kernel_write_of_write_disabled_region,
- test_kernel_gup_of_access_disabled_region,
- test_kernel_gup_write_to_write_disabled_region,
- test_executing_on_unreadable_memory,
- test_ptrace_of_child,
- test_pkey_syscalls_on_non_allocated_pkey,
- test_pkey_syscalls_bad_args,
- test_pkey_alloc_exhaust,
-};
-
-void run_tests_once(void)
-{
- int *ptr;
- int prot = PROT_READ|PROT_WRITE;
-
- for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) {
- int pkey;
- int orig_pkru_faults = pkru_faults;
-
- dprintf1("======================\n");
- dprintf1("test %d preparing...\n", test_nr);
-
- tracing_on();
- pkey = alloc_random_pkey();
- dprintf1("test %d starting with pkey: %d\n", test_nr, pkey);
- ptr = malloc_pkey(PAGE_SIZE, prot, pkey);
- dprintf1("test %d starting...\n", test_nr);
- pkey_tests[test_nr](ptr, pkey);
- dprintf1("freeing test memory: %p\n", ptr);
- free_pkey_malloc(ptr);
- sys_pkey_free(pkey);
-
- dprintf1("pkru_faults: %d\n", pkru_faults);
- dprintf1("orig_pkru_faults: %d\n", orig_pkru_faults);
-
- tracing_off();
- close_test_fds();
-
- printf("test %2d PASSED (iteration %d)\n", test_nr, iteration_nr);
- dprintf1("======================\n\n");
- }
- iteration_nr++;
-}
-
-void pkey_setup_shadow(void)
-{
- shadow_pkru = __rdpkru();
-}
-
-int main(void)
-{
- int nr_iterations = 22;
-
- setup_handlers();
-
- printf("has pku: %d\n", cpu_has_pku());
-
- if (!cpu_has_pku()) {
- int size = PAGE_SIZE;
- int *ptr;
-
- printf("running PKEY tests for unsupported CPU/OS\n");
-
- ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
- assert(ptr != (void *)-1);
- test_mprotect_pkey_on_unsupported_cpu(ptr, 1);
- exit(0);
- }
-
- pkey_setup_shadow();
- printf("startup pkru: %x\n", rdpkru());
- setup_hugetlbfs();
-
- while (nr_iterations-- > 0)
- run_tests_once();
-
- printf("done (all tests OK)\n");
- return 0;
-}
--
1.8.3.1

Next message: Ram Pai: "[RFC v4 14/17] selftest: PowerPC specific test updates to memory protection keys"
Previous message: Ram Pai: "[RFC v4 16/17] Documentation: PowerPC specific updates to memory protection keys"
In reply to: Ram Pai: "[RFC v4 16/17] Documentation: PowerPC specific updates to memory protection keys"
Next in thread: Ram Pai: "[RFC v4 14/17] selftest: PowerPC specific test updates to memory protection keys"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]