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Message-Id: <20200519134449.1466624-19-hch@lst.de>
Date: Tue, 19 May 2020 15:44:47 +0200
From: Christoph Hellwig <hch@....de>
To: x86@...nel.org, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Masami Hiramatsu <mhiramat@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-parisc@...r.kernel.org, linux-um@...ts.infradead.org,
netdev@...r.kernel.org, bpf@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 18/20] maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault
Better describe what these functions do.
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@....de>
---
arch/powerpc/kernel/process.c | 3 ++-
arch/powerpc/kvm/book3s_64_mmu_radix.c | 4 ++--
arch/powerpc/mm/fault.c | 2 +-
arch/powerpc/oprofile/backtrace.c | 6 ++++--
arch/powerpc/perf/callchain_32.c | 2 +-
arch/powerpc/perf/callchain_64.c | 2 +-
arch/powerpc/perf/core-book3s.c | 3 ++-
arch/powerpc/sysdev/fsl_pci.c | 4 ++--
include/linux/uaccess.h | 4 ++--
kernel/trace/bpf_trace.c | 6 +++---
kernel/trace/trace_kprobe.c | 8 ++++----
mm/maccess.c | 10 +++++-----
12 files changed, 29 insertions(+), 25 deletions(-)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 9c21288f86455..d5d6136b13480 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1294,7 +1294,8 @@ void show_user_instructions(struct pt_regs *regs)
for (i = 0; i < 8 && n; i++, n--, pc += sizeof(int)) {
int instr;
- if (probe_user_read(&instr, (void __user *)pc, sizeof(instr))) {
+ if (copy_from_user_nofault(&instr, (void __user *)pc,
+ sizeof(instr))) {
seq_buf_printf(&s, "XXXXXXXX ");
continue;
}
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index aa12cd4078b32..9d25f2eb5a33a 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -64,9 +64,9 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
isync();
if (is_load)
- ret = probe_user_read(to, (const void __user *)from, n);
+ ret = copy_from_user_nofault(to, (const void __user *)from, n);
else
- ret = probe_user_write((void __user *)to, from, n);
+ ret = copy_to_user_nofault((void __user *)to, from, n);
/* switch the pid first to avoid running host with unallocated pid */
if (quadrant == 1 && pid != old_pid)
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 84af6c8eecf71..231664fe9d126 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -280,7 +280,7 @@ static bool bad_stack_expansion(struct pt_regs *regs, unsigned long address,
access_ok(nip, sizeof(*nip))) {
unsigned int inst;
- if (!probe_user_read(&inst, nip, sizeof(inst)))
+ if (!copy_from_user_nofault(&inst, nip, sizeof(inst)))
return !store_updates_sp(inst);
*must_retry = true;
}
diff --git a/arch/powerpc/oprofile/backtrace.c b/arch/powerpc/oprofile/backtrace.c
index 6f347fa29f41e..9db7ada79d10d 100644
--- a/arch/powerpc/oprofile/backtrace.c
+++ b/arch/powerpc/oprofile/backtrace.c
@@ -33,7 +33,8 @@ static unsigned int user_getsp32(unsigned int sp, int is_first)
* which means that we've done all that we can do from
* interrupt context.
*/
- if (probe_user_read(stack_frame, (void __user *)p, sizeof(stack_frame)))
+ if (copy_from_user_nofault(stack_frame, (void __user *)p,
+ sizeof(stack_frame)))
return 0;
if (!is_first)
@@ -51,7 +52,8 @@ static unsigned long user_getsp64(unsigned long sp, int is_first)
{
unsigned long stack_frame[3];
- if (probe_user_read(stack_frame, (void __user *)sp, sizeof(stack_frame)))
+ if (copy_from_user_nofault(stack_frame, (void __user *)sp,
+ sizeof(stack_frame)))
return 0;
if (!is_first)
diff --git a/arch/powerpc/perf/callchain_32.c b/arch/powerpc/perf/callchain_32.c
index 8aa9510031415..2e21849f82b18 100644
--- a/arch/powerpc/perf/callchain_32.c
+++ b/arch/powerpc/perf/callchain_32.c
@@ -45,7 +45,7 @@ static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret)
((unsigned long)ptr & 3))
return -EFAULT;
- rc = probe_user_read(ret, ptr, sizeof(*ret));
+ rc = copy_from_user_nofault(ret, ptr, sizeof(*ret));
if (IS_ENABLED(CONFIG_PPC64) && rc)
return read_user_stack_slow(ptr, ret, 4);
diff --git a/arch/powerpc/perf/callchain_64.c b/arch/powerpc/perf/callchain_64.c
index df1ffd8b20f21..7b0121694ebb7 100644
--- a/arch/powerpc/perf/callchain_64.c
+++ b/arch/powerpc/perf/callchain_64.c
@@ -71,7 +71,7 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret)
((unsigned long)ptr & 7))
return -EFAULT;
- if (!probe_user_read(ret, ptr, sizeof(*ret)))
+ if (!copy_from_user_nofault(ret, ptr, sizeof(*ret)))
return 0;
return read_user_stack_slow(ptr, ret, 8);
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 50bc9f0eb6be3..f8072d1e5d172 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -426,7 +426,8 @@ static __u64 power_pmu_bhrb_to(u64 addr)
}
/* Userspace: need copy instruction here then translate it */
- if (probe_user_read(&instr, (unsigned int __user *)addr, sizeof(instr)))
+ if (copy_from_user_nofault(&instr, (unsigned int __user *)addr,
+ sizeof(instr)))
return 0;
target = branch_target(&instr);
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 4a8874bc10574..73fa37ca40ef9 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -1066,8 +1066,8 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs)
if (is_in_pci_mem_space(addr)) {
if (user_mode(regs))
- ret = probe_user_read(&inst, (void __user *)regs->nip,
- sizeof(inst));
+ ret = copy_from_user_nofault(&inst,
+ (void __user *)regs->nip, sizeof(inst));
else
ret = probe_kernel_address((void *)regs->nip, inst);
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 849bc3dca54d6..baef2e09b5ae9 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -307,8 +307,8 @@ bool copy_from_kernel_nofault_allowed(void *dst, const void *unsafe_src,
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 probe_user_read(void *dst, const void __user *src, size_t size);
-extern long notrace probe_user_write(void __user *dst, const void *src,
+long copy_from_user_nofault(void *dst, const void __user *src, size_t size);
+long notrace copy_to_user_nofault(void __user *dst, const void *src,
size_t size);
long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr,
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 5b591d3b62af0..baccff18306cf 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -139,7 +139,7 @@ static const struct bpf_func_proto bpf_override_return_proto = {
BPF_CALL_3(bpf_probe_read_user, void *, dst, u32, size,
const void __user *, unsafe_ptr)
{
- int ret = probe_user_read(dst, unsafe_ptr, size);
+ int ret = copy_from_user_nofault(dst, unsafe_ptr, size);
if (unlikely(ret < 0))
memset(dst, 0, size);
@@ -188,7 +188,7 @@ bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr,
if (IS_ENABLED(CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE) &&
compat && (unsigned long)unsafe_ptr < TASK_SIZE)
- ret = probe_user_read(dst, user_ptr, size);
+ ret = copy_from_user_nofault(dst, user_ptr, size);
else
ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
if (unlikely(ret < 0))
@@ -317,7 +317,7 @@ BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src,
if (unlikely(!nmi_uaccess_okay()))
return -EPERM;
- return probe_user_write(unsafe_ptr, src, size);
+ return copy_to_user_nofault(unsafe_ptr, src, size);
}
static const struct bpf_func_proto bpf_probe_write_user_proto = {
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index dab7c22d3e131..eb26b4c96b349 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1210,7 +1210,7 @@ fetch_store_strlen(unsigned long addr)
do {
if (IS_ENABLED(CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE) &&
(unsigned long)addr < TASK_SIZE) {
- ret = probe_user_read(&c,
+ ret = copy_from_user_nofault(&c,
(__force u8 __user *)addr + len, 1);
} else {
ret = copy_from_kernel_nofault(&c, (u8 *)addr + len, 1);
@@ -1292,8 +1292,8 @@ probe_mem_read(void *dest, void *src, size_t size)
{
if (IS_ENABLED(CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE) &&
(unsigned long)src < TASK_SIZE) {
- return probe_user_read(dest, (__force const void __user *)src,
- size);
+ return copy_from_user_nofault(dest,
+ (__force const void __user *)src, size);
}
return copy_from_kernel_nofault(dest, src, size);
@@ -1304,7 +1304,7 @@ probe_mem_read_user(void *dest, void *src, size_t size)
{
const void __user *uaddr = (__force const void __user *)src;
- return probe_user_read(dest, uaddr, size);
+ return copy_from_user_nofault(dest, uaddr, size);
}
/* Note that we don't verify it, since the code does not come from user space */
diff --git a/mm/maccess.c b/mm/maccess.c
index 955b6c973f742..1e7d77656c596 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -192,7 +192,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
#endif /* HAVE_GET_KERNEL_NOFAULT */
/**
- * probe_user_read(): safely attempt to read from a user-space location
+ * copy_from_user_nofault(): safely attempt to read from a user-space location
* @dst: pointer to the buffer that shall take the data
* @src: address to read from. This must be a user address.
* @size: size of the data chunk
@@ -200,7 +200,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
* Safely read from user address @src to the buffer at @dst. If a kernel fault
* happens, handle that and return -EFAULT.
*/
-long probe_user_read(void *dst, const void __user *src, size_t size)
+long copy_from_user_nofault(void *dst, const void __user *src, size_t size)
{
long ret = -EFAULT;
mm_segment_t old_fs = get_fs();
@@ -217,10 +217,10 @@ long probe_user_read(void *dst, const void __user *src, size_t size)
return -EFAULT;
return 0;
}
-EXPORT_SYMBOL_GPL(probe_user_read);
+EXPORT_SYMBOL_GPL(copy_from_user_nofault);
/**
- * probe_user_write(): safely attempt to write to a user-space location
+ * copy_to_user_nofault(): safely attempt to write to a user-space location
* @dst: address to write to
* @src: pointer to the data that shall be written
* @size: size of the data chunk
@@ -228,7 +228,7 @@ EXPORT_SYMBOL_GPL(probe_user_read);
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
-long probe_user_write(void __user *dst, const void *src, size_t size)
+long copy_to_user_nofault(void __user *dst, const void *src, size_t size)
{
long ret = -EFAULT;
mm_segment_t old_fs = get_fs();
--
2.26.2
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