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Subject[PATCH v2 5/5] uaccess: Rename user_access_begin/end() to user_full_access_begin/end()
Date
Now we have user_read_access_begin() and user_write_access_begin()
in addition to user_access_begin().

Make it explicit that user_access_begin() provides both read and
write by renaming it user_full_access_begin(). And the same for
user_access_end() which becomes user_full_access_end().

Done with following command, then hand splitted two too long lines.

sed -i s/user_access_begin/user_full_access_begin/g `git grep -l user_access_begin`

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
v2: New, based on remark from Al Viro.
---
arch/powerpc/include/asm/uaccess.h | 5 +++--
arch/x86/include/asm/futex.h | 4 ++--
arch/x86/include/asm/uaccess.h | 7 ++++---
include/linux/uaccess.h | 8 ++++----
4 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 4427d419eb1d..7fe799e081f2 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -456,14 +456,15 @@ extern long __copy_from_user_flushcache(void *dst, const void __user *src,
extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
size_t len);

-static __must_check inline bool user_access_begin(const void __user *ptr, size_t len)
+static __must_check inline bool
+user_full_access_begin(const void __user *ptr, size_t len)
{
if (unlikely(!access_ok(ptr, len)))
return false;
allow_read_write_user((void __user *)ptr, ptr, len);
return true;
}
-#define user_access_begin user_access_begin
+#define user_full_access_begin user_full_access_begin
#define user_access_end prevent_current_access_user
#define user_access_save prevent_user_access_return
#define user_access_restore restore_user_access
diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h
index f9c00110a69a..9eefea374bd4 100644
--- a/arch/x86/include/asm/futex.h
+++ b/arch/x86/include/asm/futex.h
@@ -56,7 +56,7 @@ do { \
static __always_inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
u32 __user *uaddr)
{
- if (!user_access_begin(uaddr, sizeof(u32)))
+ if (!user_full_access_begin(uaddr, sizeof(u32)))
return -EFAULT;

switch (op) {
@@ -92,7 +92,7 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
{
int ret = 0;

- if (!user_access_begin(uaddr, sizeof(u32)))
+ if (!user_full_access_begin(uaddr, sizeof(u32)))
return -EFAULT;
asm volatile("\n"
"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index d8f283b9a569..8776e815f215 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -473,16 +473,17 @@ extern struct movsl_mask {
* The "unsafe" user accesses aren't really "unsafe", but the naming
* is a big fat warning: you have to not only do the access_ok()
* checking before using them, but you have to surround them with the
- * user_access_begin/end() pair.
+ * user_full_access_begin/end() pair.
*/
-static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
+static __must_check __always_inline bool
+user_full_access_begin(const void __user *ptr, size_t len)
{
if (unlikely(!access_ok(ptr,len)))
return 0;
__uaccess_begin_nospec();
return 1;
}
-#define user_access_begin(a,b) user_access_begin(a,b)
+#define user_full_access_begin(a,b) user_full_access_begin(a,b)
#define user_access_end() __uaccess_end()

#define user_access_save() smap_save()
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 9861c89f93be..5be9bc930342 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -368,8 +368,8 @@ extern long strnlen_unsafe_user(const void __user *unsafe_addr, long count);
#define probe_kernel_address(addr, retval) \
probe_kernel_read(&retval, addr, sizeof(retval))

-#ifndef user_access_begin
-#define user_access_begin(ptr,len) access_ok(ptr, len)
+#ifndef user_full_access_begin
+#define user_full_access_begin(ptr,len) access_ok(ptr, len)
#define user_access_end() do { } while (0)
#define unsafe_op_wrap(op, err) do { if (unlikely(op)) goto err; } while (0)
#define unsafe_get_user(x,p,e) unsafe_op_wrap(__get_user(x,p),e)
@@ -379,11 +379,11 @@ static inline unsigned long user_access_save(void) { return 0UL; }
static inline void user_access_restore(unsigned long flags) { }
#endif
#ifndef user_write_access_begin
-#define user_write_access_begin user_access_begin
+#define user_write_access_begin user_full_access_begin
#define user_write_access_end user_access_end
#endif
#ifndef user_read_access_begin
-#define user_read_access_begin user_access_begin
+#define user_read_access_begin user_full_access_begin
#define user_read_access_end user_access_end
#endif

--
2.25.0
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