[PATCH v4 2/6] uaccess: Use user_access_ok() in user_access_begin()

[Masami Hiramatsu]

Use user_access_ok() instead of access_ok() in user_access_begin()
to validate the access context is user. This also allow us to
use (generic) strncpy_from_user() and strnlen_user() in atomic
state with setting USER_DS and disable pagefaults.

Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 arch/x86/include/asm/uaccess.h |    2 +-
 include/linux/uaccess.h        |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 3125d129d3b6..3b7502a34114 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -715,7 +715,7 @@ extern struct movsl_mask {
  */
 static __must_check inline bool user_access_begin(const void __user *ptr, 
size_t len)
 {
-       if (unlikely(!access_ok(ptr,len)))
+       if (unlikely(!user_access_ok(ptr, len)))
                return 0;
        __uaccess_begin_nospec();
        return 1;
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index bf762689658b..1afd9dfabe67 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -282,7 +282,7 @@ extern long strncpy_from_unsafe(char *dst, const void 
*unsafe_addr, long count);
        probe_kernel_read(&retval, addr, sizeof(retval))
 
 #ifndef user_access_begin
-#define user_access_begin(ptr,len) access_ok(ptr, len)
+#define user_access_begin(ptr, len) user_access_ok(ptr, len)
 #define user_access_end() do { } while (0)
 #define unsafe_get_user(x, ptr, err) do { if (unlikely(__get_user(x, ptr))) 
goto err; } while (0)
 #define unsafe_put_user(x, ptr, err) do { if (unlikely(__put_user(x, ptr))) 
goto err; } while (0)