[RFC v3 20/23] selftest: PowerPC specific test updates to memory protection keys

From: Ram Pai
Date: Wed Jun 21 2017 - 21:42:35 EST

Abstracted out the arch specific code into the header file, and
added powerpc specific changes.

a) added 4k-backed hpte, memory allocator, powerpc specific.
b) added three test case where the key is associated after the page is
accessed/allocated/mapped.
c) cleaned up the code to make checkpatch.pl happy

Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
---
tools/testing/selftests/vm/pkey-helpers.h | 230 +++++++++--
tools/testing/selftests/vm/protection_keys.c | 562 ++++++++++++++++-----------
2 files changed, 513 insertions(+), 279 deletions(-)

diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h
index b202939..69bfa89 100644
--- a/tools/testing/selftests/vm/pkey-helpers.h
+++ b/tools/testing/selftests/vm/pkey-helpers.h
@@ -12,13 +12,72 @@
#include <ucontext.h>
#include <sys/mman.h>

-#define NR_PKEYS 16
-#define PKRU_BITS_PER_PKEY 2
+/* Define some kernel-like types */
+#define u8 uint8_t
+#define u16 uint16_t
+#define u32 uint32_t
+#define u64 uint64_t
+
+#ifdef __i386__ /* arch */
+
+#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
+
+#define NR_PKEYS 16
+#define NR_RESERVED_PKEYS 1
+#define PKRU_BITS_PER_PKEY 2
+#define PKEY_DISABLE_ACCESS 0x1
+#define PKEY_DISABLE_WRITE 0x2
+#define HPAGE_SIZE (1UL<<21)
+
+#define INIT_PRKU 0x0UL
+
+#elif __powerpc64__ /* arch */
+
+#define SYS_mprotect_key 386
+#define SYS_pkey_alloc 384
+#define SYS_pkey_free 385
+#define si_pkey_offset 0x20
+#define REG_IP_IDX PT_NIP
+#define REG_TRAPNO PT_TRAP
+#define REG_AMR 45
+#define gregs gp_regs
+#define fpregs fp_regs
+
+#define NR_PKEYS 32
+#define NR_RESERVED_PKEYS 3
+#define PKRU_BITS_PER_PKEY 2
+#define PKEY_DISABLE_ACCESS 0x3 /* disable read and write */
+#define PKEY_DISABLE_WRITE 0x2
+#define HPAGE_SIZE (1UL<<24)
+
+#define INIT_PRKU 0x3UL
+#else /* arch */
+
+ NOT SUPPORTED
+
+#endif /* arch */
+

#ifndef DEBUG_LEVEL
#define DEBUG_LEVEL 0
#endif
#define DPRINT_IN_SIGNAL_BUF_SIZE 4096
+
+
+static inline u32 pkey_to_shift(int pkey)
+{
+#ifdef __i386__ /* arch */
+ return pkey * PKRU_BITS_PER_PKEY;
+#elif __powerpc64__ /* arch */
+ return (NR_PKEYS - pkey - 1) * PKRU_BITS_PER_PKEY;
+#endif /* arch */
+}
+
+
extern int dprint_in_signal;
extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
static inline void sigsafe_printf(const char *format, ...)
@@ -53,53 +112,76 @@ static inline void sigsafe_printf(const char *format, ...)
#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)
+extern u64 shadow_pkey_reg;
+
+static inline u64 __rdpkey_reg(void)
{
+#ifdef __i386__ /* arch */
unsigned int eax, edx;
unsigned int ecx = 0;
- unsigned int pkru;
+ unsigned int pkey_reg;

asm volatile(".byte 0x0f,0x01,0xee\n\t"
: "=a" (eax), "=d" (edx)
: "c" (ecx));
- pkru = eax;
- return pkru;
+#elif __powerpc64__ /* arch */
+ u64 eax;
+ u64 pkey_reg;
+
+ asm volatile("mfspr %0, 0xd" : "=r" ((u64)(eax)));
+#endif /* arch */
+ pkey_reg = (u64)eax;
+ return pkey_reg;
}

-static inline unsigned int _rdpkru(int line)
+static inline u64 _rdpkey_reg(int line)
{
- unsigned int pkru = __rdpkru();
+ u64 pkey_reg = __rdpkey_reg();

- dprintf4("rdpkru(line=%d) pkru: %x shadow: %x\n",
- line, pkru, shadow_pkru);
- assert(pkru == shadow_pkru);
+ dprintf4("rdpkey_reg(line=%d) pkey_reg: %lx shadow: %lx\n",
+ line, pkey_reg, shadow_pkey_reg);
+ assert(pkey_reg == shadow_pkey_reg);

- return pkru;
+ return pkey_reg;
}

-#define rdpkru() _rdpkru(__LINE__)
+#define rdpkey_reg() _rdpkey_reg(__LINE__)

-static inline void __wrpkru(unsigned int pkru)
+static inline void __wrpkey_reg(u64 pkey_reg)
{
- unsigned int eax = pkru;
+#ifdef __i386__ /* arch */
+ unsigned int eax = pkey_reg;
unsigned int ecx = 0;
unsigned int edx = 0;

- dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+ dprintf4("%s() changing %lx to %lx\n",
+ __func__, __rdpkey_reg(), pkey_reg);
asm volatile(".byte 0x0f,0x01,0xef\n\t"
: : "a" (eax), "c" (ecx), "d" (edx));
- assert(pkru == __rdpkru());
+ dprintf4("%s() PKRUP after changing %lx to %lx\n",
+ __func__, __rdpkey_reg(), pkey_reg);
+#else /* arch */
+ u64 eax = pkey_reg;
+
+ dprintf4("%s() changing %llx to %llx\n",
+ __func__, __rdpkey_reg(), pkey_reg);
+ asm volatile("mtspr 0xd, %0" : : "r" ((unsigned long)(eax)) : "memory");
+ dprintf4("%s() PKRUP after changing %llx to %llx\n",
+ __func__, __rdpkey_reg(), pkey_reg);
+#endif /* arch */
+ assert(pkey_reg == __rdpkey_reg());
}

-static inline void wrpkru(unsigned int pkru)
+static inline void wrpkey_reg(u64 pkey_reg)
{
- dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+ dprintf4("%s() changing %lx to %lx\n",
+ __func__, __rdpkey_reg(), pkey_reg);
/* will do the shadow check for us: */
- rdpkru();
- __wrpkru(pkru);
- shadow_pkru = pkru;
- dprintf4("%s(%08x) pkru: %08x\n", __func__, pkru, __rdpkru());
+ rdpkey_reg();
+ __wrpkey_reg(pkey_reg);
+ shadow_pkey_reg = pkey_reg;
+ dprintf4("%s(%lx) pkey_reg: %lx\n",
+ __func__, pkey_reg, __rdpkey_reg());
}

/*
@@ -108,40 +190,37 @@ static inline void wrpkru(unsigned int pkru)
*/
static inline void __pkey_access_allow(int pkey, int do_allow)
{
- unsigned int pkru = rdpkru();
+ u64 pkey_reg = rdpkey_reg();
int bit = pkey * 2;

if (do_allow)
- pkru &= (1<<bit);
+ pkey_reg &= (1<<bit);
else
- pkru |= (1<<bit);
+ pkey_reg |= (1<<bit);

- dprintf4("pkru now: %08x\n", rdpkru());
- wrpkru(pkru);
+ dprintf4("pkey_reg now: %lx\n", rdpkey_reg());
+ wrpkey_reg(pkey_reg);
}

static inline void __pkey_write_allow(int pkey, int do_allow_write)
{
- long pkru = rdpkru();
+ u64 pkey_reg = rdpkey_reg();
int bit = pkey * 2 + 1;

if (do_allow_write)
- pkru &= (1<<bit);
+ pkey_reg &= (1<<bit);
else
- pkru |= (1<<bit);
+ pkey_reg |= (1<<bit);

- wrpkru(pkru);
- dprintf4("pkru now: %08x\n", rdpkru());
+ wrpkey_reg(pkey_reg);
+ dprintf4("pkey_reg now: %lx\n", rdpkey_reg());
}

-#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)

+#ifdef __i386__ /* arch */
+
+#define PAGE_SIZE 4096
static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
@@ -159,7 +238,7 @@ static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
#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)
+static inline int cpu_has_pkey(void)
{
unsigned int eax;
unsigned int ebx;
@@ -183,7 +262,6 @@ static inline int cpu_has_pku(void)

#define XSTATE_PKRU_BIT (9)
#define XSTATE_PKRU 0x200
-
int pkru_xstate_offset(void)
{
unsigned int eax;
@@ -216,4 +294,72 @@ int pkru_xstate_offset(void)
return xstate_offset;
}

+/* 8-bytes of instruction * 512 bytes = 1 page */
+#define __page_o_noops() asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr")
+
+#elif __powerpc64__ /* arch */
+
+#define PAGE_SIZE (0x1UL << 16)
+static inline int cpu_has_pkey(void)
+{
+ return 1;
+}
+
+/* 8-bytes of instruction * 16384bytes = 1 page */
+#define __page_o_noops() asm(".rept 16384 ; nop; .endr")
+
+#endif /* arch */
+
+#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)
+
+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)
+
+
+static inline int open_hugepage_file(int flag)
+{
+ int fd;
+#ifdef __i386__ /* arch */
+ fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages",
+ O_RDONLY);
+#elif __powerpc64__ /* arch */
+ fd = open("/sys/kernel/mm/hugepages/hugepages-16384kB/nr_hugepages",
+ O_RDONLY);
+#else /* arch */
+ NOT SUPPORTED
+#endif /* arch */
+ return fd;
+}
+
+static inline int get_start_key(void)
+{
+#ifdef __i386__ /* arch */
+ return 1;
+#elif __powerpc64__ /* arch */
+ return 0;
+#else /* arch */
+ NOT SUPPORTED
+#endif /* arch */
+}
+
#endif /* _PKEYS_HELPER_H */
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 3237bc0..08b83ca 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1,10 +1,10 @@
/*
- * Tests x86 Memory Protection Keys (see Documentation/x86/protection-keys.txt)
+ * Tests Memory Protection Keys (see Documentation/vm/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
+ * * how to set/clear bits in Protection Key registers (the rights register)
+ * * how to handle SEGV_PKUERR signals and extract pkey-relevant
* information from the siginfo
*
* Things to add:
@@ -12,17 +12,23 @@
* 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
+ * 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
+ * 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 <time.h>
#include <sys/time.h>
#include <sys/syscall.h>
#include <string.h>
@@ -46,36 +52,11 @@

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)
+u64 shadow_pkey_reg;

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);
@@ -153,11 +134,6 @@ void abort_hooks(void)
#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
@@ -181,26 +157,6 @@ void lots_o_noops_around_write(int *write_to_me)
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;
@@ -208,6 +164,7 @@ void dump_mem(void *dumpme, int len_bytes)

for (i = 0; i < len_bytes; i += sizeof(u64)) {
u64 *ptr = (u64 *)(c + i);
+
dprintf1("dump[%03d][@%p]: %016jx\n", i, ptr, *ptr);
}
}
@@ -229,29 +186,48 @@ static char *si_code_str(int si_code)
return "UNKNOWN";
}

-int pkru_faults;
+int pkey_faults;
int last_si_pkey = -1;
+
+u64 reset_bits(int pkey, u64 bits)
+{
+ u32 shift = pkey_to_shift(pkey);
+
+ return ~(bits << shift);
+}
+
+u64 left_shift_bits(int pkey, u64 bits)
+{
+ u32 shift = pkey_to_shift(pkey);
+
+ return (bits << shift);
+}
+
+u64 right_shift_bits(int pkey, u64 bits)
+{
+ u32 shift = pkey_to_shift(pkey);
+
+ return (bits >> shift);
+}
+
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 *pkey_reg_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);
+ dprintf1("%s()::%d, pkey_reg: 0x%lx shadow: %lx\n", __func__, __LINE__,
+ __rdpkey_reg(), shadow_pkey_reg);

trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
- fpregset = uctxt->uc_mcontext.fpregs;
- fpregs = (void *)fpregset;
+ fpregs = (char *) uctxt->uc_mcontext.fpregs;

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);
@@ -262,20 +238,22 @@ void signal_handler(int signum, siginfo_t *si, void *vucontext)
* 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);
+ pkey_reg_ptr = (void *)(&fpregs[pkru_xstate_offset()]);
/*
- * If we got a PKRU fault, we *HAVE* to have at least one bit set in
+ * If we got a key 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);
+ dump_mem(pkey_reg_ptr - 128, 256);
+#elif __powerpc64__
+ pkey_reg_ptr = &uctxt->uc_mcontext.gregs[REG_AMR];
+#endif
+
+
+ dprintf1("siginfo: %p\n", si);
+ dprintf1(" fpregs: %p\n", fpregs);
+ pkey_assert(*pkey_reg_ptr);

si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
@@ -291,36 +269,25 @@ void signal_handler(int signum, siginfo_t *si, void *vucontext)
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("signal pkey_reg : %08x\n", *pkey_reg_ptr);
+ /*
+ * need __rdpkey_reg() version so we do not do
+ * shadow_pkey_reg checking
+ */
+ dprintf1("signal pkey_reg from pkey_reg: %08x\n", __rdpkey_reg());
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++;
+ *(u64 *)pkey_reg_ptr &= reset_bits(si_pkey, PKEY_DISABLE_ACCESS);
+ shadow_pkey_reg &= reset_bits(si_pkey, PKEY_DISABLE_ACCESS);
+ dprintf1("WARNING: set PRKU=0 to allow faulting instruction "
+ "to continue\n");
+ pkey_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);
}

@@ -409,51 +376,50 @@ void dumpit(char *f)
close(fd);
}

-#define PKEY_DISABLE_ACCESS 0x1
-#define PKEY_DISABLE_WRITE 0x2
-
-u32 pkey_get(int pkey, unsigned long flags)
+u64 pkey_get(int pkey, unsigned long flags)
{
- u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
- u32 pkru = __rdpkru();
- u32 shifted_pkru;
- u32 masked_pkru;
+ u64 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
+ u64 pkey_reg = __rdpkey_reg();
+ u64 shifted_pkey_reg;
+ u64 masked_pkey_reg;

dprintf1("%s(pkey=%d, flags=%lx) = %x / %d\n",
__func__, pkey, flags, 0, 0);
- dprintf2("%s() raw pkru: %x\n", __func__, pkru);
+ dprintf2("%s() raw pkey_reg: %lx\n", __func__, pkey_reg);

- 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);
+ shifted_pkey_reg = right_shift_bits(pkey, pkey_reg);
+ dprintf2("%s() shifted_pkey_reg: %lx\n", __func__, shifted_pkey_reg);
+ masked_pkey_reg = shifted_pkey_reg & mask;
+ dprintf2("%s() masked pkey_reg: %lx\n", __func__, masked_pkey_reg);
/*
* shift down the relevant bits to the lowest two, then
* mask off all the other high bits.
*/
- return masked_pkru;
+ return masked_pkey_reg;
}

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;
+ u64 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
+ u64 old_pkey_reg = __rdpkey_reg();
+ u64 new_pkey_reg;

/* make sure that 'rights' only contains the bits we expect: */
assert(!(rights & ~mask));

- /* copy old pkru */
- new_pkru = old_pkru;
+ /* copy old pkey_reg */
+ new_pkey_reg = old_pkey_reg;
/* mask out bits from pkey in old value: */
- new_pkru &= ~(mask << (pkey * PKRU_BITS_PER_PKEY));
+ new_pkey_reg &= reset_bits(pkey, mask);
/* OR in new bits for pkey: */
- new_pkru |= (rights << (pkey * PKRU_BITS_PER_PKEY));
+ new_pkey_reg |= left_shift_bits(pkey, rights);

- __wrpkru(new_pkru);
+ __wrpkey_reg(new_pkey_reg);

- dprintf3("%s(pkey=%d, rights=%lx, flags=%lx) = %x pkru now: %x old_pkru: %x\n",
- __func__, pkey, rights, flags, 0, __rdpkru(), old_pkru);
+ dprintf3("%s(pkey=%d, rights=%lx, flags=%lx) = %x "
+ "pkey_reg now: %x old_pkey_reg: %x\n",
+ __func__, pkey, rights, flags,
+ 0, __rdpkey_reg(), old_pkey_reg);
return 0;
}

@@ -461,8 +427,8 @@ void pkey_disable_set(int pkey, int flags)
{
unsigned long syscall_flags = 0;
int ret;
- int pkey_rights;
- u32 orig_pkru = rdpkru();
+ u64 pkey_rights;
+ u64 orig_pkey_reg = rdpkey_reg();

dprintf1("START->%s(%d, 0x%x)\n", __func__,
pkey, flags);
@@ -474,23 +440,28 @@ void pkey_disable_set(int pkey, int flags)
pkey, pkey, pkey_rights);
pkey_assert(pkey_rights >= 0);

- pkey_rights |= flags;
+ /* process flags only if they have some new bits enabled */
+ if (flags && !(pkey_rights & flags)) {
+ 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);
+ ret = pkey_set(pkey, pkey_rights, syscall_flags);
+ assert(!ret);
+ /*pkey_reg and flags have the same format */
+ shadow_pkey_reg |= left_shift_bits(pkey, flags);
+ dprintf1("%s(%d) shadow: 0x%x\n",
+ __func__, pkey, shadow_pkey_reg);

- pkey_assert(ret >= 0);
+ pkey_assert(ret >= 0);

- pkey_rights = pkey_get(pkey, syscall_flags);
- dprintf1("%s(%d) pkey_get(%d): %x\n", __func__,
- pkey, pkey, pkey_rights);
+ 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("%s(%d) pkey_reg: 0x%lx\n",
+ __func__, pkey, rdpkey_reg());
+ if (flags)
+ pkey_assert(rdpkey_reg() > orig_pkey_reg);
+ }
dprintf1("END<---%s(%d, 0x%x)\n", __func__,
pkey, flags);
}
@@ -499,8 +470,8 @@ 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();
+ u64 pkey_rights = pkey_get(pkey, syscall_flags);
+ u64 orig_pkey_reg = rdpkey_reg();

pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));

@@ -508,20 +479,21 @@ void pkey_disable_clear(int pkey, int flags)
pkey, pkey, pkey_rights);
pkey_assert(pkey_rights >= 0);

- pkey_rights |= flags;
+ pkey_rights &= ~flags;

ret = pkey_set(pkey, pkey_rights, 0);
- /* pkru and flags have the same format */
- shadow_pkru &= ~(flags << (pkey * 2));
+ /* pkey_reg and flags have the same format */
+ shadow_pkey_reg &= reset_bits(pkey, flags);
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());
+ dprintf1("%s(%d) pkey_reg: 0x%x\n",
+ __func__, pkey, rdpkey_reg());
if (flags)
- assert(rdpkru() > orig_pkru);
+ assert(rdpkey_reg() > orig_pkey_reg);
}

void pkey_write_allow(int pkey)
@@ -564,49 +536,72 @@ int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
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;
}

+void pkey_setup_shadow(void)
+{
+ shadow_pkey_reg = __rdpkey_reg();
+}
+
+void pkey_reset_shadow(u32 key)
+{
+ shadow_pkey_reg &= reset_bits(key, 0x3);
+}
+
+void pkey_set_shadow(u32 key, u64 init_val)
+{
+ shadow_pkey_reg |= left_shift_bits(key, init_val);
+}
+
int alloc_pkey(void)
{
int ret;
- unsigned long init_val = 0x0;
+ u64 init_val = 0x0;

- dprintf1("alloc_pkey()::%d, pkru: 0x%x shadow: %x\n",
- __LINE__, __rdpkru(), shadow_pkru);
+ dprintf1("%s()::%d, pkey_reg: 0x%x shadow: %x\n",
+ __func__, __LINE__, __rdpkey_reg(),
+ shadow_pkey_reg);
ret = sys_pkey_alloc(0, init_val);
/*
- * pkey_alloc() sets PKRU, so we need to reflect it in
- * shadow_pkru:
+ * pkey_alloc() sets pkey register, so we need to reflect it in
+ * shadow_pkey_reg:
*/
- dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
- __LINE__, ret, __rdpkru(), shadow_pkru);
+ dprintf4("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n",
+ __func__, __LINE__, ret, __rdpkey_reg(),
+ shadow_pkey_reg);
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);
+ pkey_reset_shadow(ret);
+ dprintf4("%s()::%d, ret: %d pkey_reg: 0x%x shadow:"
+ " 0x%x\n",
+ __func__, __LINE__, ret,
+ __rdpkey_reg(), shadow_pkey_reg);
/*
* move the new state in from init_val
- * (remember, we cheated and init_val == pkru format)
+ * (remember, we cheated and init_val == pkey_reg format)
*/
- shadow_pkru |= (init_val << (ret * 2));
+ pkey_set_shadow(ret, init_val);
}
- 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);
+ dprintf4("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n",
+ __func__, __LINE__, ret, __rdpkey_reg(),
+ shadow_pkey_reg);
+ dprintf1("%s()::%d errno: %d\n", __func__, __LINE__, errno);
/* for shadow checking: */
- rdpkru();
- dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
- __LINE__, ret, __rdpkru(), shadow_pkru);
+ rdpkey_reg();
+ dprintf4("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n",
+ __func__, __LINE__, ret, __rdpkey_reg(),
+ shadow_pkey_reg);
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;
}
@@ -624,13 +619,15 @@ int alloc_random_pkey(void)
int alloced_pkeys[NR_PKEYS];
int nr_alloced = 0;
int random_index;
+
memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
+ srand((unsigned int)time(NULL));

/* 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;
@@ -646,13 +643,14 @@ int alloc_random_pkey(void)
/* 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);
+ dprintf1("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, ret, __rdpkey_reg(), shadow_pkey_reg);
return ret;
}

@@ -664,17 +662,22 @@ int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,

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",
+
+ 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);
+ dprintf1("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n",
+ __func__, __LINE__, ret, __rdpkey_reg(),
+ shadow_pkey_reg);
sys_pkey_free(rpkey);
- dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
- __LINE__, ret, __rdpkru(), shadow_pkru);
+ dprintf1("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n",
+ __func__, __LINE__, ret, __rdpkey_reg(),
+ shadow_pkey_reg);
}
pkey_assert(pkey < NR_PKEYS);

@@ -682,8 +685,8 @@ int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
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);
+ dprintf1("%s()::%d, ret: %d pkey_reg: 0x%x shadow: 0x%x\n", __func__,
+ __LINE__, ret, __rdpkey_reg(), shadow_pkey_reg);
return ret;
}

@@ -708,7 +711,9 @@ void record_pkey_malloc(void *ptr, long size)
/* 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);
+ 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);
@@ -732,9 +737,11 @@ 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) ||
@@ -761,16 +768,46 @@ void *malloc_pkey_with_mprotect(long size, int prot, u16 pkey)
void *ptr;
int ret;

- rdpkru();
+ rdpkey_reg();
+ 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);
+ rdpkey_reg();
+
+ dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
+ return ptr;
+}
+
+void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
+{
+ void *ptr;
+ int ret;
+
+#ifdef __powerpc64__
+ return PTR_ERR_ENOTSUP;
+#endif /* __powerpc64__ */
+ rdpkey_reg();
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 = syscall(__NR_subpage_prot, ptr, size, NULL);
+ if (ret) {
+ perror("subpage_perm");
+ return PTR_ERR_ENOTSUP;
+ }
+
ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
pkey_assert(!ret);
record_pkey_malloc(ptr, size);
- rdpkru();
+ rdpkey_reg();

dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
return ptr;
@@ -815,17 +852,19 @@ void setup_hugetlbfs(void)
char buf[] = "123";

if (geteuid() != 0) {
- fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
+ 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");
+ 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);
+ fd = open_hugepage_file(O_RDONLY);
if (fd < 0) {
perror("opening sysfs 2M hugetlb config");
return;
@@ -840,7 +879,8 @@ void setup_hugetlbfs(void)
}

if (atoi(buf) != GET_NR_HUGE_PAGES) {
- fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
+ fprintf(stderr, "could not confirm 2M pages, got:"
+ " '%s' expected %d\n",
buf, GET_NR_HUGE_PAGES);
return;
}
@@ -895,12 +935,13 @@ void *malloc_pkey_mmap_dax(long size, int prot, u16 pkey)
void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {

malloc_pkey_with_mprotect,
+ malloc_pkey_with_mprotect_subpage,
malloc_pkey_anon_huge,
malloc_pkey_hugetlb
/* can not do direct with the pkey_mprotect() API:
- malloc_pkey_mmap_direct,
- malloc_pkey_mmap_dax,
-*/
+ * malloc_pkey_mmap_direct,
+ * malloc_pkey_mmap_dax,
+ */
};

void *malloc_pkey(long size, int prot, u16 pkey)
@@ -933,31 +974,32 @@ void *malloc_pkey(long size, int prot, u16 pkey)
return ret;
}

-int last_pkru_faults;
-void expected_pk_fault(int pkey)
+int last_pkey_faults;
+void expected_pkey_faults(int pkey)
{
- dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
- __func__, last_pkru_faults, pkru_faults);
+ dprintf2("%s(): last_pkey_faults: %d pkey_faults: %d\n",
+ __func__, last_pkey_faults, pkey_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_pkey_faults + 1 == pkey_faults);
pkey_assert(last_si_pkey == pkey);
/*
- * The signal handler shold have cleared out PKRU to let the
+ * The signal handler shold have cleared out pkey-register to let the
* test program continue. We now have to restore it.
*/
- if (__rdpkru() != 0)
+ if (__rdpkey_reg() != shadow_pkey_reg)
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;
+ __wrpkey_reg(shadow_pkey_reg);
+ dprintf1("%s() set pkey-register=%x to restore state "
+ " after signal nuked it\n",
+ __func__, shadow_pkey_reg);
+ last_pkey_faults = pkey_faults;
last_si_pkey = -1;
}

void do_not_expect_pk_fault(void)
{
- pkey_assert(last_pkru_faults == pkru_faults);
+ pkey_assert(last_pkey_faults == pkey_faults);
}

int test_fds[10] = { -1 };
@@ -973,6 +1015,7 @@ void __save_test_fd(int fd)
int get_test_read_fd(void)
{
int test_fd = open("/etc/passwd", O_RDONLY);
+
__save_test_fd(test_fd);
return test_fd;
}
@@ -1009,32 +1052,76 @@ void test_read_of_write_disabled_region(int *ptr, u16 pkey)
ptr_contents = read_ptr(ptr);
dprintf1("*ptr: %d\n", ptr_contents);
dprintf1("\n");
+ do_not_expect_pk_fault();
}
+
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();
+ dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
+ pkey, ptr);
+ rdpkey_reg();
pkey_access_deny(pkey);
ptr_contents = read_ptr(ptr);
dprintf1("*ptr: %d\n", ptr_contents);
- expected_pk_fault(pkey);
+ expected_pkey_faults(pkey);
}
+
+void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
+ u16 pkey)
+{
+ int ptr_contents;
+
+ dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
+ pkey, ptr);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("reading ptr before disabling the read : %d\n",
+ ptr_contents);
+ rdpkey_reg();
+ pkey_access_deny(pkey);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("*ptr: %d\n", ptr_contents);
+ expected_pkey_faults(pkey);
+}
+
+void test_write_of_write_disabled_region_with_page_already_mapped(int *ptr,
+ u16 pkey)
+{
+ *ptr = __LINE__;
+ dprintf1("disabling write access; after accessing the page, "
+ "to PKEY[%02d], doing write\n", pkey);
+ pkey_write_deny(pkey);
+ *ptr = __LINE__;
+ expected_pkey_faults(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);
+ expected_pkey_faults(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);
+ expected_pkey_faults(pkey);
}
+
+void test_write_of_access_disabled_region_with_page_already_mapped(int *ptr,
+ u16 pkey)
+{
+ *ptr = __LINE__;
+ dprintf1("disabling access; after accessing the page, "
+ " to PKEY[%02d], doing write\n", pkey);
+ pkey_access_deny(pkey);
+ *ptr = __LINE__;
+ expected_pkey_faults(pkey);
+}
+
void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
{
int ret;
@@ -1103,10 +1190,10 @@ void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
{
int err;
- int i;
+ int i = get_start_key();

/* Note: 0 is the default pkey, so don't mess with it */
- for (i = 1; i < NR_PKEYS; i++) {
+ for (; i < NR_PKEYS; i++) {
if (pkey == i)
continue;

@@ -1126,7 +1213,7 @@ void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
{
int err;
- int bad_pkey = NR_PKEYS+99;
+ int bad_pkey = NR_PKEYS+pkey;

/* pass a known-invalid pkey in: */
err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, bad_pkey);
@@ -1136,21 +1223,24 @@ void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
/* Assumes that all pkeys other than 'pkey' are unallocated */
void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
{
- int err;
+ int err = 0;
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);
+ dprintf4("%s()::%d, err: %d pkey_reg: 0x%x shadow: 0x%x\n",
+ __func__, __LINE__, err, __rdpkey_reg(),
+ shadow_pkey_reg);
+ rdpkey_reg(); /* 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",
+ dprintf2("%s() allocate failed pkey after %d tries\n",
__func__, nr_allocated_pkeys);
break;
}
@@ -1165,19 +1255,17 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
* 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).
+ * There are NR_PKEYS pkeys supported in hardware. NR_RESERVED_KEYS
+ * are reserved. One can be taken up by an execute-only mapping.
+ * Ensure that we can allocate at least the remaining.
*/
- pkey_assert(i >= NR_PKEYS-2);
+ pkey_assert(i >= (NR_PKEYS-NR_RESERVED_PKEYS-1));

for (i = 0; i < nr_allocated_pkeys; i++) {
err = sys_pkey_free(allocated_pkeys[i]);
pkey_assert(!err);
- rdpkru(); /* for shadow checking */
+ rdpkey_reg(); /* for shadow checking */
}
}

@@ -1221,10 +1309,10 @@ void test_ptrace_of_child(int *ptr, u16 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);
- */
+ * 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:
@@ -1234,7 +1322,7 @@ void test_ptrace_of_child(int *ptr, u16 pkey)
pkey_assert(ret != -1);
/* Now access from the current task, and expect an exception: */
peek_result = read_ptr(ptr);
- expected_pk_fault(pkey);
+ expected_pkey_faults(pkey);

/*
* Try to access the NON-pkey-protected "plain_ptr" via ptrace:
@@ -1281,7 +1369,7 @@ void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
pkey_assert(!ret);
pkey_access_deny(pkey);

- dprintf2("pkru: %x\n", rdpkru());
+ dprintf2("pkey_reg: %x\n", rdpkey_reg());

/*
* Make sure this is an *instruction* fault
@@ -1291,7 +1379,7 @@ void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
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);
+ expected_pkey_faults(pkey);
}

void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
@@ -1299,7 +1387,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
int size = PAGE_SIZE;
int sret;

- if (cpu_has_pku()) {
+ if (cpu_has_pkey()) {
dprintf1("SKIP: %s: no CPU support\n", __func__);
return;
}
@@ -1311,8 +1399,11 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
void (*pkey_tests[])(int *ptr, u16 pkey) = {
test_read_of_write_disabled_region,
test_read_of_access_disabled_region,
+ test_read_of_access_disabled_region_with_page_already_mapped,
test_write_of_write_disabled_region,
+ test_write_of_write_disabled_region_with_page_already_mapped,
test_write_of_access_disabled_region,
+ test_write_of_access_disabled_region_with_page_already_mapped,
test_kernel_write_of_access_disabled_region,
test_kernel_write_of_write_disabled_region,
test_kernel_gup_of_access_disabled_region,
@@ -1331,7 +1422,7 @@ void run_tests_once(void)

for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) {
int pkey;
- int orig_pkru_faults = pkru_faults;
+ int orig_pkey_faults = pkey_faults;

dprintf1("======================\n");
dprintf1("test %d preparing...\n", test_nr);
@@ -1346,45 +1437,42 @@ void run_tests_once(void)
free_pkey_malloc(ptr);
sys_pkey_free(pkey);

- dprintf1("pkru_faults: %d\n", pkru_faults);
- dprintf1("orig_pkru_faults: %d\n", orig_pkru_faults);
+ dprintf1("pkey_faults: %d\n", pkey_faults);
+ dprintf1("orig_pkey_faults: %d\n", orig_pkey_faults);

tracing_off();
close_test_fds();

- printf("test %2d PASSED (iteration %d)\n", test_nr, iteration_nr);
+ 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());
+ printf("has pkey support: %d\n", cpu_has_pkey());

- if (!cpu_has_pku()) {
+ if (!cpu_has_pkey()) {
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);
+ 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());
+ printf("startup pkey_reg: %lx\n", rdpkey_reg());
setup_hugetlbfs();

while (nr_iterations-- > 0)
--
1.8.3.1