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BACKPORT: maccess: remove strncpy_from_unsafe

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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200521152301.2587579-16-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Change-Id: Id1d12538ec284c86e4eb7b0d35e7bea07b20d617
This commit is contained in:
Christoph Hellwig 2020-06-08 21:34:47 -07:00 • committed by basamaryan
commit 2cce23ea9b
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GPG key ID: 210D5384FB2A5885
2 changed files with 0 additions and 39 deletions
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1
include/linux/uaccess.h
View file

@ -313,7 +313,6 @@ extern long probe_user_read(void *dst, const void __user *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 strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count);
long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr,
long count);

38
mm/maccess.c
View file

@ -6,9 +6,6 @@
#include <linux/mm.h>
#include <linux/uaccess.h>
static long __strncpy_from_unsafe(char *dst, const void *unsafe_addr,
long count, bool strict);
bool __weak probe_kernel_read_allowed(const void *unsafe_src, size_t size)
{
return true;
@ -131,35 +128,6 @@ long probe_user_write(void __user *dst, const void *src, size_t size)
}
EXPORT_SYMBOL_GPL(probe_user_write);
/**
* strncpy_from_unsafe: - Copy a NUL terminated string from unsafe address.
* @dst: Destination address, in kernel space. This buffer must be at
* least @count bytes long.
* @unsafe_addr: Unsafe address.
* @count: Maximum number of bytes to copy, including the trailing NUL.
*
* Copies a NUL-terminated string from unsafe address to kernel buffer.
*
* On success, returns the length of the string INCLUDING the trailing NUL.
*
* If access fails, returns -EFAULT (some data may have been copied
* and the trailing NUL added).
*
* If @count is smaller than the length of the string, copies @count-1 bytes,
* sets the last byte of @dst buffer to NUL and returns @count.
*
* Same as strncpy_from_kernel_nofault() except that for architectures with
* not fully separated user and kernel address spaces this function also works
* for user address tanges.
*
* DO NOT USE THIS FUNCTION - it is broken on architectures with entirely
* separate kernel and user address spaces, and also a bad idea otherwise.
*/
long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)
{
return __strncpy_from_unsafe(dst, unsafe_addr, count, false);
}
/**
* strncpy_from_kernel_nofault: - Copy a NUL terminated string from unsafe
* address.
@ -179,12 +147,6 @@ long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)
* sets the last byte of @dst buffer to NUL and returns @count.
*/
long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
{
return __strncpy_from_unsafe(dst, unsafe_addr, count, true);
}
static long __strncpy_from_unsafe(char *dst, const void *unsafe_addr,
long count, bool strict)
{
mm_segment_t old_fs = get_fs();
const void *src = unsafe_addr;