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wifi: mac80211: Replace strlcpy with strscpy

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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>
Link: https://lore.kernel.org/r/20230613003404.3538524-1-azeemshaikh38@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Azeem Shaikh 2023-06-13 00:34:04 +00:00 committed by Johannes Berg
parent 0ffe85885b
commit f3c21ed9ce
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/trace.h
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@ -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