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| author |   Kees Cook <keescook@chromium.org> | 2022-09-29 02:24:53 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-11-01 10:04:51 -0700 |
| commit | 9e4a617757273a86b560c1ece40c48e4940a3c79 (patch) | |
| tree | 324f6fc68db62db7baeef3adc173ae50862ebf1e /include/linux/string.h | |
| parent | kunit/memcpy: Add dynamic size and window tests (diff) | |
| download | wireguard-linux-9e4a617757273a86b560c1ece40c48e4940a3c79.tar.xz wireguard-linux-9e4a617757273a86b560c1ece40c48e4940a3c79.zip | |
string: Add __realloc_size hint to kmemdup()
Add __realloc_size() hint to kmemdup() so the compiler can reason about
the length of the returned buffer. (These must not use __alloc_size,
since those include __malloc which says the contents aren't defined[1]).
[1] https://lore.kernel.org/linux-hardening/d199c2af-06af-8a50-a6a1-00eefa0b67b4@prevas.dk/
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/linux/string.h')
| -rw-r--r-- | include/linux/string.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/string.h b/include/linux/string.h index cf7607b32102..db28802ab0a6 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -176,7 +176,7 @@ extern void kfree_const(const void *x); extern char *kstrdup(const char *s, gfp_t gfp) __malloc; extern const char *kstrdup_const(const char *s, gfp_t gfp); extern char *kstrndup(const char *s, size_t len, gfp_t gfp); -extern void *kmemdup(const void *src, size_t len, gfp_t gfp); +extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp); extern char **argv_split(gfp_t gfp, const char *str, int *argcp); |