| Message ID | 20230613003404.3538524-1-azeemshaikh38@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Johannes Berg |
| Headers | show |
| Series | mac80211: Replace strlcpy with strscpy | expand |
On Tue, Jun 13, 2023 at 12:34:04AM +0000, Azeem Shaikh wrote: > strlcpy() reads the entire source buffer first. > This read may exceed the destination size limit. > This is both inefficient and can lead to linear read > overflows if a source string is not NUL-terminated [1]. > In an effort to remove strlcpy() completely [2], replace > strlcpy() here with strscpy(). > > Direct replacement is safe here since LOCAL_ASSIGN is only used by > TRACE macros and the return values are ignored. > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy > [2] https://github.com/KSPP/linux/issues/89 > > Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org>
On Tue, Jun 13, 2023 at 12:34:04AM +0000, Azeem Shaikh wrote: > strlcpy() reads the entire source buffer first. > This read may exceed the destination size limit. > This is both inefficient and can lead to linear read > overflows if a source string is not NUL-terminated [1]. > In an effort to remove strlcpy() completely [2], replace > strlcpy() here with strscpy(). > > Direct replacement is safe here since LOCAL_ASSIGN is only used by > TRACE macros and the return values are ignored. > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy > [2] https://github.com/KSPP/linux/issues/89 > > Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com> Reviewed-by: Simon Horman <simon.horman@corigine.com>
diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h index db0d0132c58c..c51c6e3feac9 100644 --- a/net/mac80211/trace.h +++ b/net/mac80211/trace.h @@ -17,7 +17,7 @@ #define MAXNAME 32 #define LOCAL_ENTRY __array(char, wiphy_name, 32) -#define LOCAL_ASSIGN strlcpy(__entry->wiphy_name, wiphy_name(local->hw.wiphy), MAXNAME) +#define LOCAL_ASSIGN strscpy(__entry->wiphy_name, wiphy_name(local->hw.wiphy), MAXNAME) #define LOCAL_PR_FMT "%s" #define LOCAL_PR_ARG __entry->wiphy_name
strlcpy() reads the entire source buffer first. This read may exceed the destination size limit. This is both inefficient and can lead to linear read overflows if a source string is not NUL-terminated [1]. In an effort to remove strlcpy() completely [2], replace strlcpy() here with strscpy(). Direct replacement is safe here since LOCAL_ASSIGN is only used by TRACE macros and the return values are ignored. [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [2] https://github.com/KSPP/linux/issues/89 Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com> --- net/mac80211/trace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)