[PATCH 16/18] maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault

From: Christoph Hellwig
Date: Wed May 13 2020 - 12:01:50 EST

Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/arm/kernel/ftrace.c | 3 +-
arch/arm/kernel/kgdb.c | 2 +-
arch/arm64/kernel/insn.c | 4 +--
arch/csky/kernel/ftrace.c | 5 ++--
arch/ia64/kernel/ftrace.c | 6 ++--
arch/mips/kernel/kprobes.c | 6 ++--
arch/nds32/kernel/ftrace.c | 5 ++--
arch/parisc/kernel/ftrace.c | 2 +-
arch/parisc/kernel/kgdb.c | 4 +--
arch/parisc/lib/memcpy.c | 3 +-
arch/powerpc/kernel/module_64.c | 5 ++--
arch/powerpc/kernel/trace/ftrace.c | 24 +++++++--------
arch/powerpc/perf/core-book3s.c | 3 +-
arch/riscv/kernel/ftrace.c | 3 +-
arch/riscv/kernel/patch.c | 4 +--
arch/s390/kernel/ftrace.c | 4 +--
arch/sh/kernel/ftrace.c | 6 ++--
arch/um/kernel/maccess.c | 2 +-
arch/x86/include/asm/ptrace.h | 4 +--
arch/x86/kernel/dumpstack.c | 2 +-
arch/x86/kernel/ftrace.c | 8 ++---
arch/x86/kernel/kgdb.c | 6 ++--
arch/x86/kernel/kprobes/core.c | 5 ++--
arch/x86/kernel/kprobes/opt.c | 2 +-
arch/x86/kernel/traps.c | 3 +-
arch/x86/mm/fault.c | 2 +-
arch/x86/mm/init_32.c | 2 +-
arch/x86/mm/maccess.c | 3 +-
arch/x86/xen/enlighten_pv.c | 2 +-
drivers/char/mem.c | 2 +-
drivers/dio/dio.c | 6 ++--
drivers/input/serio/hp_sdc.c | 2 +-
drivers/misc/kgdbts.c | 6 ++--
drivers/video/fbdev/hpfb.c | 2 +-
fs/proc/kcore.c | 3 +-
include/linux/uaccess.h | 14 +++++----
kernel/debug/debug_core.c | 6 ++--
kernel/debug/gdbstub.c | 6 ++--
kernel/debug/kdb/kdb_main.c | 3 +-
kernel/debug/kdb/kdb_support.c | 7 +++--
kernel/kthread.c | 2 +-
kernel/trace/bpf_trace.c | 2 +-
kernel/trace/trace_kprobe.c | 4 +--
kernel/workqueue.c | 10 +++----
mm/maccess.c | 48 +++++++++++++++---------------
mm/rodata_test.c | 2 +-
mm/slub.c | 2 +-
47 files changed, 137 insertions(+), 120 deletions(-)

diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
index 10499d44964a2..9a79ef6b1876c 100644
--- a/arch/arm/kernel/ftrace.c
+++ b/arch/arm/kernel/ftrace.c
@@ -84,7 +84,8 @@ static int ftrace_modify_code(unsigned long pc, unsigned long old,
old = __opcode_to_mem_arm(old);

if (validate) {
- if (probe_kernel_read(&replaced, (void *)pc, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(&replaced, (void *)pc,
+ MCOUNT_INSN_SIZE))
return -EFAULT;

if (replaced != old)
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index 6a95b92966406..7bd30c0a4280d 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -236,7 +236,7 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
/* patch_text() only supports int-sized breakpoints */
BUILD_BUG_ON(sizeof(int) != BREAK_INSTR_SIZE);

- err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
+ err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c
index 4a9e773a177f0..c5f7a7b8d2c3e 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -123,7 +123,7 @@ int __kprobes aarch64_insn_read(void *addr, u32 *insnp)
int ret;
__le32 val;

- ret = probe_kernel_read(&val, addr, AARCH64_INSN_SIZE);
+ ret = copy_from_kernel_nofault(&val, addr, AARCH64_INSN_SIZE);
if (!ret)
*insnp = le32_to_cpu(val);

@@ -139,7 +139,7 @@ static int __kprobes __aarch64_insn_write(void *addr, __le32 insn)
raw_spin_lock_irqsave(&patch_lock, flags);
waddr = patch_map(addr, FIX_TEXT_POKE0);

- ret = probe_kernel_write(waddr, &insn, AARCH64_INSN_SIZE);
+ ret = copy_to_kernel_nofault(waddr, &insn, AARCH64_INSN_SIZE);

patch_unmap(FIX_TEXT_POKE0);
raw_spin_unlock_irqrestore(&patch_lock, flags);
diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c
index 44628e3f7fa68..bded363eae714 100644
--- a/arch/csky/kernel/ftrace.c
+++ b/arch/csky/kernel/ftrace.c
@@ -72,7 +72,8 @@ static int ftrace_check_current_nop(unsigned long hook)
uint16_t olds[7];
unsigned long hook_pos = hook - 2;

- if (probe_kernel_read((void *)olds, (void *)hook_pos, sizeof(nops)))
+ if (copy_from_kernel_nofault((void *)olds, (void *)hook_pos,
+ sizeof(nops)))
return -EFAULT;

if (memcmp((void *)nops, (void *)olds, sizeof(nops))) {
@@ -97,7 +98,7 @@ static int ftrace_modify_code(unsigned long hook, unsigned long target,

make_jbsr(target, hook, call, nolr);

- ret = probe_kernel_write((void *)hook_pos, enable ? call : nops,
+ ret = copy_to_kernel_nofault((void *)hook_pos, enable ? call : nops,
sizeof(nops));
if (ret)
return -EPERM;
diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
index cee411e647ca0..b2ab2d58fb30c 100644
--- a/arch/ia64/kernel/ftrace.c
+++ b/arch/ia64/kernel/ftrace.c
@@ -108,7 +108,7 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
goto skip_check;

/* read the text we want to modify */
- if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;

/* Make sure it is what we expect it to be */
@@ -117,7 +117,7 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,

skip_check:
/* replace the text with the new text */
- if (probe_kernel_write(((void *)ip), new_code, MCOUNT_INSN_SIZE))
+ if (copy_to_kernel_nofault(((void *)ip), new_code, MCOUNT_INSN_SIZE))
return -EPERM;
flush_icache_range(ip, ip + MCOUNT_INSN_SIZE);

@@ -129,7 +129,7 @@ static int ftrace_make_nop_check(struct dyn_ftrace *rec, unsigned long addr)
unsigned char __attribute__((aligned(8))) replaced[MCOUNT_INSN_SIZE];
unsigned long ip = rec->ip;

- if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
if (rec->flags & FTRACE_FL_CONVERTED) {
struct ftrace_call_insn *call_insn, *tmp_call;
diff --git a/arch/mips/kernel/kprobes.c b/arch/mips/kernel/kprobes.c
index 6cfae2411c044..d043c2f897fc2 100644
--- a/arch/mips/kernel/kprobes.c
+++ b/arch/mips/kernel/kprobes.c
@@ -86,9 +86,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
goto out;
}

- if ((probe_kernel_read(&prev_insn, p->addr - 1,
- sizeof(mips_instruction)) == 0) &&
- insn_has_delayslot(prev_insn)) {
+ if (copy_from_kernel_nofault(&prev_insn, p->addr - 1,
+ sizeof(mips_instruction)) == 0 &&
+ insn_has_delayslot(prev_insn)) {
pr_notice("Kprobes for branch delayslot are not supported\n");
ret = -EINVAL;
goto out;
diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
index 22ab77ea27ad3..3763b3f8c3db5 100644
--- a/arch/nds32/kernel/ftrace.c
+++ b/arch/nds32/kernel/ftrace.c
@@ -131,13 +131,14 @@ static int __ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
unsigned long orig_insn[3];

if (validate) {
- if (probe_kernel_read(orig_insn, (void *)pc, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(orig_insn, (void *)pc,
+ MCOUNT_INSN_SIZE))
return -EFAULT;
if (memcmp(orig_insn, old_insn, MCOUNT_INSN_SIZE))
return -EINVAL;
}

- if (probe_kernel_write((void *)pc, new_insn, MCOUNT_INSN_SIZE))
+ if (copy_to_kernel_nofault((void *)pc, new_insn, MCOUNT_INSN_SIZE))
return -EPERM;

return 0;
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index b836fc61a24f4..1df0f67ed6671 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -172,7 +172,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)

ip = (void *)(rec->ip + 4 - size);

- ret = probe_kernel_read(insn, ip, size);
+ ret = copy_from_kernel_nofault(insn, ip, size);
if (ret)
return ret;

diff --git a/arch/parisc/kernel/kgdb.c b/arch/parisc/kernel/kgdb.c
index 664278db9b977..c4554ac13eac7 100644
--- a/arch/parisc/kernel/kgdb.c
+++ b/arch/parisc/kernel/kgdb.c
@@ -154,8 +154,8 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)

int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
- int ret = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
- BREAK_INSTR_SIZE);
+ int ret = copy_from_kernel_nofault(bpt->saved_instr,
+ (char *)bpt->bpt_addr, BREAK_INSTR_SIZE);
if (ret)
return ret;

diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c
index 9fe662b3b5604..f51811d613d72 100644
--- a/arch/parisc/lib/memcpy.c
+++ b/arch/parisc/lib/memcpy.c
@@ -57,7 +57,8 @@ void * memcpy(void * dst,const void *src, size_t count)
EXPORT_SYMBOL(raw_copy_in_user);
EXPORT_SYMBOL(memcpy);

-bool probe_kernel_read_allowed(void *dst, const void *unsafe_src, size_t size)
+bool copy_from_kernel_nofault_allowed(void *dst, const void *unsafe_src,
+ size_t size)
{
if ((unsigned long)unsafe_src < PAGE_SIZE)
return false;
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 007606a48fd98..29067ef485411 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -159,7 +159,7 @@ int module_trampoline_target(struct module *mod, unsigned long addr,

stub = (struct ppc64_stub_entry *)addr;

- if (probe_kernel_read(&magic, &stub->magic, sizeof(magic))) {
+ if (copy_from_kernel_nofault(&magic, &stub->magic, sizeof(magic))) {
pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name);
return -EFAULT;
}
@@ -169,7 +169,8 @@ int module_trampoline_target(struct module *mod, unsigned long addr,
return -EFAULT;
}

- if (probe_kernel_read(&funcdata, &stub->funcdata, sizeof(funcdata))) {
+ if (copy_from_kernel_nofault(&funcdata, &stub->funcdata,
+ sizeof(funcdata))) {
pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name);
return -EFAULT;
}
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 7ea0ca044b650..60ee6813830c3 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -67,7 +67,7 @@ ftrace_modify_code(unsigned long ip, unsigned int old, unsigned int new)
*/

/* read the text we want to modify */
- if (probe_kernel_read(&replaced, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(&replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;

/* Make sure it is what we expect it to be */
@@ -128,7 +128,7 @@ __ftrace_make_nop(struct module *mod,
unsigned int op, pop;

/* read where this goes */
- if (probe_kernel_read(&op, (void *)ip, sizeof(int))) {
+ if (copy_from_kernel_nofault(&op, (void *)ip, sizeof(int))) {
pr_err("Fetching opcode failed.\n");
return -EFAULT;
}
@@ -162,7 +162,7 @@ __ftrace_make_nop(struct module *mod,
/* When using -mkernel_profile there is no load to jump over */
pop = PPC_INST_NOP;

- if (probe_kernel_read(&op, (void *)(ip - 4), 4)) {
+ if (copy_from_kernel_nofault(&op, (void *)(ip - 4), 4)) {
pr_err("Fetching instruction at %lx failed.\n", ip - 4);
return -EFAULT;
}
@@ -193,7 +193,7 @@ __ftrace_make_nop(struct module *mod,
* Check what is in the next instruction. We can see ld r2,40(r1), but
* on first pass after boot we will see mflr r0.
*/
- if (probe_kernel_read(&op, (void *)(ip+4), MCOUNT_INSN_SIZE)) {
+ if (copy_from_kernel_nofault(&op, (void *)(ip+4), MCOUNT_INSN_SIZE)) {
pr_err("Fetching op failed.\n");
return -EFAULT;
}
@@ -222,7 +222,7 @@ __ftrace_make_nop(struct module *mod,
unsigned long ip = rec->ip;
unsigned long tramp;

- if (probe_kernel_read(&op, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(&op, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;

/* Make sure that that this is still a 24bit jump */
@@ -245,7 +245,7 @@ __ftrace_make_nop(struct module *mod,
pr_devel("ip:%lx jumps to %lx", ip, tramp);

/* Find where the trampoline jumps to */
- if (probe_kernel_read(jmp, (void *)tramp, sizeof(jmp))) {
+ if (copy_from_kernel_nofault(jmp, (void *)tramp, sizeof(jmp))) {
pr_err("Failed to read %lx\n", tramp);
return -EFAULT;
}
@@ -341,7 +341,7 @@ static int setup_mcount_compiler_tramp(unsigned long tramp)
return -1;

/* New trampoline -- read where this goes */
- if (probe_kernel_read(&op, (void *)tramp, sizeof(int))) {
+ if (copy_from_kernel_nofault(&op, (void *)tramp, sizeof(int))) {
pr_debug("Fetching opcode failed.\n");
return -1;
}
@@ -391,7 +391,7 @@ static int __ftrace_make_nop_kernel(struct dyn_ftrace *rec, unsigned long addr)
unsigned int op;

/* Read where this goes */
- if (probe_kernel_read(&op, (void *)ip, sizeof(int))) {
+ if (copy_from_kernel_nofault(&op, (void *)ip, sizeof(int))) {
pr_err("Fetching opcode failed.\n");
return -EFAULT;
}
@@ -516,7 +516,7 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
struct module *mod = rec->arch.mod;

/* read where this goes */
- if (probe_kernel_read(op, ip, sizeof(op)))
+ if (copy_from_kernel_nofault(op, ip, sizeof(op)))
return -EFAULT;

if (!expected_nop_sequence(ip, op[0], op[1])) {
@@ -578,7 +578,7 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
unsigned long ip = rec->ip;

/* read where this goes */
- if (probe_kernel_read(&op, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(&op, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;

/* It should be pointing to a nop */
@@ -634,7 +634,7 @@ static int __ftrace_make_call_kernel(struct dyn_ftrace *rec, unsigned long addr)
}

/* Make sure we have a nop */
- if (probe_kernel_read(&op, ip, sizeof(op))) {
+ if (copy_from_kernel_nofault(&op, ip, sizeof(op))) {
pr_err("Unable to read ftrace location %p\n", ip);
return -EFAULT;
}
@@ -712,7 +712,7 @@ __ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
}

/* read where this goes */
- if (probe_kernel_read(&op, (void *)ip, sizeof(int))) {
+ if (copy_from_kernel_nofault(&op, (void *)ip, sizeof(int))) {
pr_err("Fetching opcode failed.\n");
return -EFAULT;
}
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 3dcfecf858f36..50bc9f0eb6be3 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -418,7 +418,8 @@ static __u64 power_pmu_bhrb_to(u64 addr)
__u64 target;

if (is_kernel_addr(addr)) {
- if (probe_kernel_read(&instr, (void *)addr, sizeof(instr)))
+ if (copy_from_kernel_nofault(&instr, (void *)addr,
+ sizeof(instr)))
return 0;

return branch_target(&instr);
diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
index ce69b34ff55d0..143a22ab8853e 100644
--- a/arch/riscv/kernel/ftrace.c
+++ b/arch/riscv/kernel/ftrace.c
@@ -25,7 +25,8 @@ static int ftrace_check_current_call(unsigned long hook_pos,
* Read the text we want to modify;
* return must be -EFAULT on read error
*/
- if (probe_kernel_read(replaced, (void *)hook_pos, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(replaced, (void *)hook_pos,
+ MCOUNT_INSN_SIZE))
return -EFAULT;

/*
diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
index 8a4fc65ee0222..9a0ade9fa10b0 100644
--- a/arch/riscv/kernel/patch.c
+++ b/arch/riscv/kernel/patch.c
@@ -57,7 +57,7 @@ static int __kprobes riscv_insn_write(void *addr, const void *insn, size_t len)

waddr = patch_map(addr, FIX_TEXT_POKE0);

- ret = probe_kernel_write(waddr, insn, len);
+ ret = copy_to_kernel_nofault(waddr, insn, len);

patch_unmap(FIX_TEXT_POKE0);

@@ -71,7 +71,7 @@ static int __kprobes riscv_insn_write(void *addr, const void *insn, size_t len)
#else
static int __kprobes riscv_insn_write(void *addr, const void *insn, size_t len)
{
- return probe_kernel_write(addr, insn, len);
+ return copy_to_kernel_nofault(addr, insn, len);
}
#endif /* CONFIG_MMU */

diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 4cd9b1ada8340..1576f0eede771 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -99,7 +99,7 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
{
struct ftrace_insn orig, new, old;

- if (probe_kernel_read(&old, (void *) rec->ip, sizeof(old)))
+ if (copy_from_kernel_nofault(&old, (void *) rec->ip, sizeof(old)))
return -EFAULT;
if (addr == MCOUNT_ADDR) {
/* Initial code replacement */
@@ -121,7 +121,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
struct ftrace_insn orig, new, old;

- if (probe_kernel_read(&old, (void *) rec->ip, sizeof(old)))
+ if (copy_from_kernel_nofault(&old, (void *) rec->ip, sizeof(old)))
return -EFAULT;
/* Replace nop with an ftrace call. */
ftrace_generate_nop_insn(&orig);
diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
index 1b04270e5460e..0646c59618466 100644
--- a/arch/sh/kernel/ftrace.c
+++ b/arch/sh/kernel/ftrace.c
@@ -119,7 +119,7 @@ static void ftrace_mod_code(void)
* But if one were to fail, then they all should, and if one were
* to succeed, then they all should.
*/
- mod_code_status = probe_kernel_write(mod_code_ip, mod_code_newcode,
+ mod_code_status = copy_to_kernel_nofault(mod_code_ip, mod_code_newcode,
MCOUNT_INSN_SIZE);

/* if we fail, then kill any new writers */
@@ -203,7 +203,7 @@ static int ftrace_modify_code(unsigned long ip, unsigned char *old_code,
*/

/* read the text we want to modify */
- if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;

/* Make sure it is what we expect it to be */
@@ -268,7 +268,7 @@ static int ftrace_mod(unsigned long ip, unsigned long old_addr,
{
unsigned char code[MCOUNT_INSN_SIZE];

- if (probe_kernel_read(code, (void *)ip, MCOUNT_INSN_SIZE))
+ if (copy_from_kernel_nofault(code, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;

if (old_addr != __raw_readl((unsigned long *)code))
diff --git a/arch/um/kernel/maccess.c b/arch/um/kernel/maccess.c
index 734f3d7e57c0f..cedf73e9e8ce2 100644
--- a/arch/um/kernel/maccess.c
+++ b/arch/um/kernel/maccess.c
@@ -7,7 +7,7 @@
#include <linux/kernel.h>
#include <os.h>

-bool probe_kernel_read_allowed(void *dst, const void *src, size_t size)
+bool copy_from_kernel_nofault_allowed(void *dst, const void *src, size_t size)
{
void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);

diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index 6d6475fdd3278..62ac40751276f 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -278,7 +278,7 @@ static inline unsigned long *regs_get_kernel_stack_nth_addr(struct pt_regs *regs
}

/* To avoid include hell, we can't include uaccess.h */
-extern long probe_kernel_read(void *dst, const void *src, size_t size);
+extern long copy_from_kernel_nofault(void *dst, const void *src, size_t size);

/**
* regs_get_kernel_stack_nth() - get Nth entry of the stack
@@ -298,7 +298,7 @@ static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,

addr = regs_get_kernel_stack_nth_addr(regs, n);
if (addr) {
- ret = probe_kernel_read(&val, addr, sizeof(val));
+ ret = copy_from_kernel_nofault(&val, addr, sizeof(val));
if (!ret)
return val;
}
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index ae64ec7f752f4..f8dd06ccd8d2e 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -106,7 +106,7 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl)
bad_ip = user_mode(regs) &&
__chk_range_not_ok(prologue, OPCODE_BUFSIZE, TASK_SIZE_MAX);

- if (bad_ip || probe_kernel_read(opcodes, (u8 *)prologue,
+ if (bad_ip || copy_from_kernel_nofault(opcodes, (u8 *)prologue,
OPCODE_BUFSIZE)) {
printk("%sCode: Bad RIP value.\n", loglvl);
} else {
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 37a0aeaf89e77..018adf1f18bea 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -86,7 +86,7 @@ static int ftrace_verify_code(unsigned long ip, const char *old_code)
* sure what we read is what we expected it to be before modifying it.
*/
/* read the text we want to modify */
- if (probe_kernel_read(cur_code, (void *)ip, MCOUNT_INSN_SIZE)) {
+ if (copy_from_kernel_nofault(cur_code, (void *)ip, MCOUNT_INSN_SIZE)) {
WARN_ON(1);
return -EFAULT;
}
@@ -354,7 +354,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
npages = DIV_ROUND_UP(*tramp_size, PAGE_SIZE);

/* Copy ftrace_caller onto the trampoline memory */
- ret = probe_kernel_read(trampoline, (void *)start_offset, size);
+ ret = copy_from_kernel_nofault(trampoline, (void *)start_offset, size);
if (WARN_ON(ret < 0))
goto fail;

@@ -362,7 +362,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)

/* The trampoline ends with ret(q) */
retq = (unsigned long)ftrace_stub;
- ret = probe_kernel_read(ip, (void *)retq, RET_SIZE);
+ ret = copy_from_kernel_nofault(ip, (void *)retq, RET_SIZE);
if (WARN_ON(ret < 0))
goto fail;

@@ -471,7 +471,7 @@ static void *addr_from_call(void *ptr)
union text_poke_insn call;
int ret;

- ret = probe_kernel_read(&call, ptr, CALL_INSN_SIZE);
+ ret = copy_from_kernel_nofault(&call, ptr, CALL_INSN_SIZE);
if (WARN_ON_ONCE(ret < 0))
return NULL;

diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index c44fe7d8d9a4e..68acd30c6b878 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -732,11 +732,11 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
int err;

bpt->type = BP_BREAKPOINT;
- err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
+ err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
- err = probe_kernel_write((char *)bpt->bpt_addr,
+ err = copy_to_kernel_nofault((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
if (!err)
return err;
@@ -768,7 +768,7 @@ int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
return 0;

knl_write:
- return probe_kernel_write((char *)bpt->bpt_addr,
+ return copy_to_kernel_nofault((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}

diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 4d7022a740ab0..ecffda528f86f 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -243,7 +243,7 @@ __recover_probed_insn(kprobe_opcode_t *buf, unsigned long addr)
* Fortunately, we know that the original code is the ideal 5-byte
* long NOP.
*/
- if (probe_kernel_read(buf, (void *)addr,
+ if (copy_from_kernel_nofault(buf, (void *)addr,
MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
return 0UL;

@@ -346,7 +346,8 @@ int __copy_instruction(u8 *dest, u8 *src, u8 *real, struct insn *insn)
return 0;

/* This can access kernel text if given address is not recovered */
- if (probe_kernel_read(dest, (void *)recovered_insn, MAX_INSN_SIZE))
+ if (copy_from_kernel_nofault(dest, (void *)recovered_insn,
+ MAX_INSN_SIZE))
return 0;

kernel_insn_init(insn, dest, MAX_INSN_SIZE);
diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index ea13f68882849..85696911093f4 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -56,7 +56,7 @@ unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr)
* overwritten by jump destination address. In this case, original
* bytes must be recovered from op->optinsn.copied_insn buffer.
*/
- if (probe_kernel_read(buf, (void *)addr,
+ if (copy_from_kernel_nofault(buf, (void *)addr,
MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
return 0UL;

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index d54cffdc7cac2..96809f6aad67d 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -483,7 +483,8 @@ static enum kernel_gp_hint get_kernel_gp_address(struct pt_regs *regs,
u8 insn_buf[MAX_INSN_SIZE];
struct insn insn;

- if (probe_kernel_read(insn_buf, (void *)regs->ip, MAX_INSN_SIZE))
+ if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip,
+ MAX_INSN_SIZE))
return GP_NO_HINT;

kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index a51df516b87bf..994e207abdf64 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -590,7 +590,7 @@ static void show_ldttss(const struct desc_ptr *gdt, const char *name, u16 index)
return;
}

- if (probe_kernel_read(&desc, (void *)(gdt->address + offset),
+ if (copy_from_kernel_nofault(&desc, (void *)(gdt->address + offset),
sizeof(struct ldttss_desc))) {
pr_alert("%s: 0x%hx -- GDT entry is not readable\n",
name, index);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 4222a010057a9..4253c95968932 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -758,7 +758,7 @@ static void __init test_wp_bit(void)

__set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO);

- if (probe_kernel_write((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
+ if (copy_to_kernel_nofault((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
clear_fixmap(FIX_WP_TEST);
printk(KERN_CONT "Ok.\n");
return;
diff --git a/arch/x86/mm/maccess.c b/arch/x86/mm/maccess.c
index a1bd81677aa72..a29111d25a990 100644
--- a/arch/x86/mm/maccess.c
+++ b/arch/x86/mm/maccess.c
@@ -26,7 +26,8 @@ static __always_inline bool invalid_probe_range(u64 vaddr)
}
#endif

-bool probe_kernel_read_allowed(void *dst, const void *unsafe_src, size_t size)
+bool copy_from_kernel_nofault_allowed(void *dst, const void *unsafe_src,
+ size_t size)
{
return !invalid_probe_range((unsigned long)unsafe_src);
}
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 507f4fb88fa7f..0a76fd298d896 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -387,7 +387,7 @@ static void set_aliased_prot(void *v, pgprot_t prot)

preempt_disable();

- probe_kernel_read(&dummy, v, 1);
+ copy_from_kernel_nofault(&dummy, v, 1);

if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
BUG();
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 43dd0891ca1ed..12774655aff45 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -167,7 +167,7 @@ static ssize_t read_mem(struct file *file, char __user *buf,
if (!ptr)
goto failed;

- probe = probe_kernel_read(bounce, ptr, sz);
+ probe = copy_from_kernel_nofault(bounce, ptr, sz);
unxlate_dev_mem_ptr(p, ptr);
if (probe)
goto failed;
diff --git a/drivers/dio/dio.c b/drivers/dio/dio.c
index c9aa15fb86a9a..193b40e7aec03 100644
--- a/drivers/dio/dio.c
+++ b/drivers/dio/dio.c
@@ -135,7 +135,8 @@ int __init dio_find(int deviceid)
else
va = ioremap(pa, PAGE_SIZE);

- if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
+ if (copy_from_kernel_nofault(&i,
+ (unsigned char *)va + DIO_IDOFF, 1)) {
if (scode >= DIOII_SCBASE)
iounmap(va);
continue; /* no board present at that select code */
@@ -208,7 +209,8 @@ static int __init dio_init(void)
else
va = ioremap(pa, PAGE_SIZE);

- if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
+ if (copy_from_kernel_nofault(&i,
+ (unsigned char *)va + DIO_IDOFF, 1)) {
if (scode >= DIOII_SCBASE)
iounmap(va);
continue; /* no board present at that select code */
diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c
index 654252361653d..13eacf6ab4310 100644
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -1021,7 +1021,7 @@ static int __init hp_sdc_register(void)
hp_sdc.base_io = (unsigned long) 0xf0428000;
hp_sdc.data_io = (unsigned long) hp_sdc.base_io + 1;
hp_sdc.status_io = (unsigned long) hp_sdc.base_io + 3;
- if (!probe_kernel_read(&i, (unsigned char *)hp_sdc.data_io, 1))
+ if (!copy_from_kernel_nofault(&i, (unsigned char *)hp_sdc.data_io, 1))
hp_sdc.dev = (void *)1;
hp_sdc.dev_err = hp_sdc_init();
#endif
diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index bccd341e9ae16..d5d2af4d10e66 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -828,7 +828,7 @@ static void run_plant_and_detach_test(int is_early)
char before[BREAK_INSTR_SIZE];
char after[BREAK_INSTR_SIZE];

- probe_kernel_read(before, (char *)kgdbts_break_test,
+ copy_from_kernel_nofault(before, (char *)kgdbts_break_test,
BREAK_INSTR_SIZE);
init_simple_test();
ts.tst = plant_and_detach_test;
@@ -836,8 +836,8 @@ static void run_plant_and_detach_test(int is_early)
/* Activate test with initial breakpoint */
if (!is_early)
kgdb_breakpoint();
- probe_kernel_read(after, (char *)kgdbts_break_test,
- BREAK_INSTR_SIZE);
+ copy_from_kernel_nofault(after, (char *)kgdbts_break_test,
+ BREAK_INSTR_SIZE);
if (memcmp(before, after, BREAK_INSTR_SIZE)) {
printk(KERN_CRIT "kgdbts: ERROR kgdb corrupted memory\n");
panic("kgdb memory corruption");
diff --git a/drivers/video/fbdev/hpfb.c b/drivers/video/fbdev/hpfb.c
index f02be0db335e9..8d418abdd7678 100644
--- a/drivers/video/fbdev/hpfb.c
+++ b/drivers/video/fbdev/hpfb.c
@@ -402,7 +402,7 @@ int __init hpfb_init(void)
if (err)
return err;

- err = probe_kernel_read(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);
+ err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);

if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 8ba492d44e689..e502414b35564 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -512,7 +512,8 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
* Using bounce buffer to bypass the
* hardened user copy kernel text checks.
*/
- if (probe_kernel_read(buf, (void *) start, tsz)) {
+ if (copy_from_kernel_nofault(buf, (void *)start,
+ tsz)) {
if (clear_user(buffer, tsz)) {
ret = -EFAULT;
goto out;
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 78e0ff8641559..849bc3dca54d6 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -301,13 +301,15 @@ copy_struct_from_user(void *dst, size_t ksize, const void __user *src,
return 0;
}

-bool probe_kernel_read_allowed(void *dst, const void *unsafe_src, size_t size);
+bool copy_from_kernel_nofault_allowed(void *dst, const void *unsafe_src,
+ size_t size);

-extern long probe_kernel_read(void *dst, const void *src, size_t size);
-extern long probe_user_read(void *dst, const void __user *src, size_t size);
+long copy_from_kernel_nofault(void *dst, const void *src, size_t size);
+long notrace copy_to_kernel_nofault(void *dst, const void *src, size_t size);

-extern long notrace probe_kernel_write(void *dst, const void *src, size_t size);
-extern long notrace probe_user_write(void __user *dst, const void *src, size_t size);
+extern long probe_user_read(void *dst, const void __user *src, size_t size);
+extern long notrace probe_user_write(void __user *dst, const void *src,
+ size_t size);

long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr,
long count);
@@ -324,7 +326,7 @@ long strnlen_user_nofault(const void __user *unsafe_addr, long count);
* Returns 0 on success, or -EFAULT.
*/
#define probe_kernel_address(addr, retval) \
- probe_kernel_read(&retval, addr, sizeof(retval))
+ copy_from_kernel_nofault(&retval, addr, sizeof(retval))

#ifndef user_access_begin
#define user_access_begin(ptr,len) access_ok(ptr, len)
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 2b7c9b67931d6..b5c2492e0b010 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -171,18 +171,18 @@ int __weak kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;

- err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
+ err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
- err = probe_kernel_write((char *)bpt->bpt_addr,
+ err = copy_to_kernel_nofault((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
return err;
}

int __weak kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
- return probe_kernel_write((char *)bpt->bpt_addr,
+ return copy_to_kernel_nofault((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}

diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index 4b280fc7dd675..61774aec46b4c 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -247,7 +247,7 @@ char *kgdb_mem2hex(char *mem, char *buf, int count)
*/
tmp = buf + count;

- err = probe_kernel_read(tmp, mem, count);
+ err = copy_from_kernel_nofault(tmp, mem, count);
if (err)
return NULL;
while (count > 0) {
@@ -283,7 +283,7 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
*tmp_raw |= hex_to_bin(*tmp_hex--) << 4;
}

- return probe_kernel_write(mem, tmp_raw, count);
+ return copy_to_kernel_nofault(mem, tmp_raw, count);
}

/*
@@ -335,7 +335,7 @@ static int kgdb_ebin2mem(char *buf, char *mem, int count)
size++;
}

- return probe_kernel_write(mem, c, size);
+ return copy_to_kernel_nofault(mem, c, size);
}

#if DBG_MAX_REG_NUM > 0
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 515379cbf2092..31858c3839ca5 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2325,7 +2325,8 @@ void kdb_ps1(const struct task_struct *p)
int cpu;
unsigned long tmp;

- if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
+ if (!p ||
+ copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return;

cpu = kdb_process_cpu(p);
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index b8e6306e7e133..004c5b6c87f89 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -325,7 +325,7 @@ char *kdb_strdup(const char *str, gfp_t type)
*/
int kdb_getarea_size(void *res, unsigned long addr, size_t size)
{
- int ret = probe_kernel_read((char *)res, (char *)addr, size);
+ int ret = copy_from_kernel_nofault((char *)res, (char *)addr, size);
if (ret) {
if (!KDB_STATE(SUPPRESS)) {
kdb_printf("kdb_getarea: Bad address 0x%lx\n", addr);
@@ -350,7 +350,7 @@ int kdb_getarea_size(void *res, unsigned long addr, size_t size)
*/
int kdb_putarea_size(unsigned long addr, void *res, size_t size)
{
- int ret = probe_kernel_read((char *)addr, (char *)res, size);
+ int ret = copy_from_kernel_nofault((char *)addr, (char *)res, size);
if (ret) {
if (!KDB_STATE(SUPPRESS)) {
kdb_printf("kdb_putarea: Bad address 0x%lx\n", addr);
@@ -624,7 +624,8 @@ char kdb_task_state_char (const struct task_struct *p)
char state;
unsigned long tmp;

- if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
+ if (!p ||
+ copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return 'E';

cpu = kdb_process_cpu(p);
diff --git a/kernel/kthread.c b/kernel/kthread.c
index bfbfa481be3a5..e19ebe61232ca 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -179,7 +179,7 @@ void *kthread_probe_data(struct task_struct *task)
struct kthread *kthread = to_kthread(task);
void *data = NULL;

- probe_kernel_read(&data, &kthread->data, sizeof(data));
+ copy_from_kernel_nofault(&data, &kthread->data, sizeof(data));
return data;
}

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 5dea4169a8323..1b0b817eb3248 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -186,7 +186,7 @@ bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr,
if (unlikely(ret < 0))
goto fail;

- ret = probe_kernel_read(dst, unsafe_ptr, size);
+ ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
if (unlikely(ret < 0)) {
if (compat)
ret = probe_user_read(dst, user_ptr, size);
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 7725146369731..0e306983cd658 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1208,7 +1208,7 @@ fetch_store_strlen(unsigned long addr)
u8 c;

do {
- ret = probe_kernel_read(&c, (u8 *)addr + len, 1);
+ ret = copy_from_kernel_nofault(&c, (u8 *)addr + len, 1);
if (ret)
ret = probe_user_read(&c,
(__force u8 __user *)addr + len, 1);
@@ -1287,7 +1287,7 @@ probe_mem_read(void *dest, void *src, size_t size)
const void __user *user_ptr = (__force const void __user *)src;
int ret;

- ret = probe_kernel_read(dest, src, size);
+ ret = copy_from_kernel_nofault(dest, src, size);
if (ret)
ret = probe_user_read(dest, user_ptr, size);
return ret;
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 891ccad5f2716..a1345ffa3a0ba 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4627,11 +4627,11 @@ void print_worker_info(const char *log_lvl, struct task_struct *task)
* Carefully copy the associated workqueue's workfn, name and desc.
* Keep the original last '\0' in case the original is garbage.
*/
- probe_kernel_read(&fn, &worker->current_func, sizeof(fn));
- probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));
- probe_kernel_read(&wq, &pwq->wq, sizeof(wq));
- probe_kernel_read(name, wq->name, sizeof(name) - 1);
- probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);
+ copy_from_kernel_nofault(&fn, &worker->current_func, sizeof(fn));
+ copy_from_kernel_nofault(&pwq, &worker->current_pwq, sizeof(pwq));
+ copy_from_kernel_nofault(&wq, &pwq->wq, sizeof(wq));
+ copy_from_kernel_nofault(name, wq->name, sizeof(name) - 1);
+ copy_from_kernel_nofault(desc, worker->desc, sizeof(desc) - 1);

if (fn || name[0] || desc[0]) {
printk("%sWorkqueue: %s %ps", log_lvl, name, fn);
diff --git a/mm/maccess.c b/mm/maccess.c
index e9efe2f98e34a..4c342a69ae71d 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -6,7 +6,7 @@
#include <linux/mm.h>
#include <linux/uaccess.h>

-bool __weak probe_kernel_read_allowed(void *dst, const void *unsafe_src,
+bool __weak copy_from_kernel_nofault_allowed(void *dst, const void *unsafe_src,
size_t size)
{
return true;
@@ -14,7 +14,7 @@ bool __weak probe_kernel_read_allowed(void *dst, const void *unsafe_src,

#ifdef HAVE_ARCH_PROBE_KERNEL

-#define probe_kernel_read_loop(dst, src, len, type, err_label) \
+#define copy_from_kernel_nofault_loop(dst, src, len, type, err_label) \
while (len >= sizeof(type)) { \
arch_kernel_read(dst, src, type, err_label); \
dst += sizeof(type); \
@@ -22,25 +22,25 @@ bool __weak probe_kernel_read_allowed(void *dst, const void *unsafe_src,
len -= sizeof(type); \
}

-long probe_kernel_read(void *dst, const void *src, size_t size)
+long copy_from_kernel_nofault(void *dst, const void *src, size_t size)
{
- if (!probe_kernel_read_allowed(dst, src, size))
+ if (!copy_from_kernel_nofault_allowed(dst, src, size))
return -EFAULT;

pagefault_disable();
- probe_kernel_read_loop(dst, src, size, u64, Efault);
- probe_kernel_read_loop(dst, src, size, u32, Efault);
- probe_kernel_read_loop(dst, src, size, u16, Efault);
- probe_kernel_read_loop(dst, src, size, u8, Efault);
+ copy_from_kernel_nofault_loop(dst, src, size, u64, Efault);
+ copy_from_kernel_nofault_loop(dst, src, size, u32, Efault);
+ copy_from_kernel_nofault_loop(dst, src, size, u16, Efault);
+ copy_from_kernel_nofault_loop(dst, src, size, u8, Efault);
pagefault_enable();
return 0;
Efault:
pagefault_enable();
return -EFAULT;
}
-EXPORT_SYMBOL_GPL(probe_kernel_read);
+EXPORT_SYMBOL_GPL(copy_from_kernel_nofault);

-#define probe_kernel_write_loop(dst, src, len, type, err_label) \
+#define copy_to_kernel_nofault_loop(dst, src, len, type, err_label) \
while (len >= sizeof(type)) { \
arch_kernel_write(dst, src, type, err_label); \
dst += sizeof(type); \
@@ -48,13 +48,13 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
len -= sizeof(type); \
}

-long probe_kernel_write(void *dst, const void *src, size_t size)
+long copy_to_kernel_nofault(void *dst, const void *src, size_t size)
{
pagefault_disable();
- probe_kernel_write_loop(dst, src, size, u64, Efault);
- probe_kernel_write_loop(dst, src, size, u32, Efault);
- probe_kernel_write_loop(dst, src, size, u16, Efault);
- probe_kernel_write_loop(dst, src, size, u8, Efault);
+ copy_to_kernel_nofault_loop(dst, src, size, u64, Efault);
+ copy_to_kernel_nofault_loop(dst, src, size, u32, Efault);
+ copy_to_kernel_nofault_loop(dst, src, size, u16, Efault);
+ copy_to_kernel_nofault_loop(dst, src, size, u8, Efault);
pagefault_enable();
return 0;
Efault:
@@ -68,7 +68,7 @@ long strncpy_from_kernel_unsafe(char *dst, const void *unsafe_addr, long count)

if (unlikely(count <= 0))
return 0;
- if (!probe_kernel_read_allowed(dst, unsafe_addr, count))
+ if (!copy_from_kernel_nofault_allowed(dst, unsafe_addr, count))
return -EFAULT;

pagefault_disable();
@@ -88,7 +88,7 @@ long strncpy_from_kernel_unsafe(char *dst, const void *unsafe_addr, long count)
}
#else /* HAVE_ARCH_PROBE_KERNEL */
/**
- * probe_kernel_read(): safely attempt to read from kernel-space
+ * copy_from_kernel_nofault(): safely attempt to read from kernel-space
* @dst: pointer to the buffer that shall take the data
* @src: address to read from
* @size: size of the data chunk
@@ -98,15 +98,15 @@ long strncpy_from_kernel_unsafe(char *dst, const void *unsafe_addr, long count)
*
* We ensure that the copy_from_user is executed in atomic context so that
* do_page_fault() doesn't attempt to take mmap_sem. This makes
- * probe_kernel_read() suitable for use within regions where the caller
+ * copy_from_kernel_nofault() suitable for use within regions where the caller
* already holds mmap_sem, or other locks which nest inside mmap_sem.
*/
-long probe_kernel_read(void *dst, const void *src, size_t size)
+long copy_from_kernel_nofault(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();

- if (!probe_kernel_read_allowed(dst, src, size))
+ if (!copy_from_kernel_nofault_allowed(dst, src, size))
return -EFAULT;

set_fs(KERNEL_DS);
@@ -120,10 +120,10 @@ long probe_kernel_read(void *dst, const void *src, size_t size)
return -EFAULT;
return 0;
}
-EXPORT_SYMBOL_GPL(probe_kernel_read);
+EXPORT_SYMBOL_GPL(copy_from_kernel_nofault);

/**
- * probe_kernel_write(): safely attempt to write to a location
+ * copy_to_kernel_nofault(): safely attempt to write to a location
* @dst: address to write to
* @src: pointer to the data that shall be written
* @size: size of the data chunk
@@ -131,7 +131,7 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
-long probe_kernel_write(void *dst, const void *src, size_t size)
+long copy_to_kernel_nofault(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
@@ -173,7 +173,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)

if (unlikely(count <= 0))
return 0;
- if (!probe_kernel_read_allowed(dst, unsafe_addr, count))
+ if (!copy_from_kernel_nofault_allowed(dst, unsafe_addr, count))
return -EFAULT;

set_fs(KERNEL_DS);
diff --git a/mm/rodata_test.c b/mm/rodata_test.c
index 5e313fa93276d..2a99df7beeb35 100644
--- a/mm/rodata_test.c
+++ b/mm/rodata_test.c
@@ -25,7 +25,7 @@ void rodata_test(void)
}

/* test 2: write to the variable; this should fault */
- if (!probe_kernel_write((void *)&rodata_test_data,
+ if (!copy_to_kernel_nofault((void *)&rodata_test_data,
(void *)&zero, sizeof(zero))) {
pr_err("test data was not read only\n");
return;
diff --git a/mm/slub.c b/mm/slub.c
index b762450fc9f07..4af02f7af7118 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -292,7 +292,7 @@ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
return get_freepointer(s, object);

freepointer_addr = (unsigned long)object + s->offset;
- probe_kernel_read(&p, (void **)freepointer_addr, sizeof(p));
+ copy_from_kernel_nofault(&p, (void **)freepointer_addr, sizeof(p));
return freelist_ptr(s, p, freepointer_addr);
}

--
2.26.2