diff options
| author | Tobin C. Harding <tobin@kernel.org> | 2019-04-05 12:58:58 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-13 13:51:15 +0100 |
| commit | 2a3687034e47c51cd4f01ce82ed16f1964008b9e (patch) | |
| tree | 675886c2eab4da0fa55fbe27e21303f2b8665234 /include | |
| parent | 9848962bfb28515c476bcf34a8ec9655ccee08e4 (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')
| -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 4db285b83f44..1e0c442b941e 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -31,6 +31,10 @@ 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 |