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string: uninline memcpy_and_pad 

commit 5c4e0a21fa upstream.

When building m68k:allmodconfig, recent versions of gcc generate the
following error if the length of UTS_RELEASE is less than 8 bytes.

  In function 'memcpy_and_pad',
    inlined from 'nvmet_execute_disc_identify' at
      drivers/nvme/target/discovery.c:268:2: arch/m68k/include/asm/string.h:72:25: error:
	'__builtin_memcpy' reading 8 bytes from a region of size 7

Discussions around the problem suggest that this only happens if an
architecture does not provide strlen(), if -ffreestanding is provided as
compiler option, and if CONFIG_FORTIFY_SOURCE=n. All of this is the case
for m68k. The exact reasons are unknown, but seem to be related to the
ability of the compiler to evaluate the return value of strlen() and
the resulting execution flow in memcpy_and_pad(). It would be possible
to work around the problem by using sizeof(UTS_RELEASE) instead of
strlen(UTS_RELEASE), but that would only postpone the problem until the
function is called in a similar way. Uninline memcpy_and_pad() instead
to solve the problem for good.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guenter Roeck 2021-11-02 07:24:20 -07:00 committed by Greg Kroah-Hartman
parent 3b17187f5c
commit d27b2dcdb8
2 changed files with 22 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/linux/string.h
View File

@ -262,23 +262,8 @@ void __write_overflow(void) __compiletime_error("detected write beyond size of o
#include <linux/fortify-string.h>
#endif
/**
* memcpy_and_pad - Copy one buffer to another with padding
* @dest: Where to copy to
* @dest_len: The destination buffer size
* @src: Where to copy from
* @count: The number of bytes to copy
* @pad: Character to use for padding if space is left in destination.
*/
static inline void memcpy_and_pad(void *dest, size_t dest_len,
const void *src, size_t count, int pad)
{
if (dest_len > count) {
memcpy(dest, src, count);
memset(dest + count, pad, dest_len - count);
} else
memcpy(dest, src, dest_len);
}
void memcpy_and_pad(void *dest, size_t dest_len, const void *src, size_t count,
int pad);
/**
* str_has_prefix - Test if a string has a given prefix

20
lib/string_helpers.c
View File

@ -696,3 +696,23 @@ void kfree_strarray(char **array, size_t n)
kfree(array);
}
EXPORT_SYMBOL_GPL(kfree_strarray);
/**
* memcpy_and_pad - Copy one buffer to another with padding
* @dest: Where to copy to
* @dest_len: The destination buffer size
* @src: Where to copy from
* @count: The number of bytes to copy
* @pad: Character to use for padding if space is left in destination.
*/
void memcpy_and_pad(void *dest, size_t dest_len, const void *src, size_t count,
int pad)
{
if (dest_len > count) {
memcpy(dest, src, count);
memset(dest + count, pad, dest_len - count);
} else {
memcpy(dest, src, dest_len);
}
}
EXPORT_SYMBOL(memcpy_and_pad);