diff options
| author | Tobin C. Harding <tobin@kernel.org> | 2019-04-05 12:58:58 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-23 14:00:30 +0100 |
| commit | fe072e50be403fc52c426c15073b8c38ce301416 (patch) | |
| tree | 732e87200c49ba14db91fb549589c3b5a8f2152d /include/linux/string.h | |
| parent | 8019d7074d061d6511ca33fcb40f0b1a67ab4279 (diff) | |
lib/string: Add strscpy_pad() function
[ Upstream commit 458a3bf82df4fe1f951d0f52b1e0c1e9d5a88a3b ]
We have a function to copy strings safely and we have a function to copy
strings and zero the tail of the destination (if source string is
shorter than destination buffer) but we do not have a function to do
both at once. This means developers must write this themselves if they
desire this functionality. This is a chore, and also leaves us open to
off by one errors unnecessarily.
Add a function that calls strscpy() then memset()s the tail to zero if
the source string is shorter than the destination buffer.
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Shuah Khan <shuah@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux/string.h')
| -rw-r--r-- | include/linux/string.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/string.h b/include/linux/string.h index 315fef3aff4e..3b5d01e80962 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -30,6 +30,10 @@ size_t strlcpy(char *, const char *, size_t); #ifndef __HAVE_ARCH_STRSCPY ssize_t strscpy(char *, const char *, size_t); #endif + +/* Wraps calls to strscpy()/memset(), no arch specific code required */ +ssize_t strscpy_pad(char *dest, const char *src, size_t count); + #ifndef __HAVE_ARCH_STRCAT extern char * strcat(char *, const char *); #endif |