* [PATCH v2] wifi: cfg80211: replace strlcpy() with strlscpy()
@ 2023-06-14 13:45 Azeem Shaikh
2023-06-14 13:47 ` Azeem Shaikh
0 siblings, 1 reply; 2+ messages in thread
From: Azeem Shaikh @ 2023-06-14 13:45 UTC (permalink / raw)
To: Kalle Valo
Cc: linux-hardening, Azeem Shaikh, linux-wireless, linux-kernel,
David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
netdev, Johannes Berg
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 WIPHY_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>
---
v1: https://lore.kernel.org/all/20230612232301.2572316-1-azeemshaikh38@gmail.com/
Changes from v1 - updated patch title.
net/wireless/trace.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 716a1fa70069..a00da3ebfed5 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -22,7 +22,7 @@
#define MAXNAME 32
#define WIPHY_ENTRY __array(char, wiphy_name, 32)
-#define WIPHY_ASSIGN strlcpy(__entry->wiphy_name, wiphy_name(wiphy), MAXNAME)
+#define WIPHY_ASSIGN strscpy(__entry->wiphy_name, wiphy_name(wiphy), MAXNAME)
#define WIPHY_PR_FMT "%s"
#define WIPHY_PR_ARG __entry->wiphy_name
--
2.41.0.162.gfafddb0af9-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] wifi: cfg80211: replace strlcpy() with strlscpy()
2023-06-14 13:45 [PATCH v2] wifi: cfg80211: replace strlcpy() with strlscpy() Azeem Shaikh
@ 2023-06-14 13:47 ` Azeem Shaikh
0 siblings, 0 replies; 2+ messages in thread
From: Azeem Shaikh @ 2023-06-14 13:47 UTC (permalink / raw)
To: Kalle Valo
Cc: linux-hardening, linux-wireless, linux-kernel, David S. Miller,
Eric Dumazet, Jakub Kicinski, Paolo Abeni, netdev, Johannes Berg
Please ignore this patch. I made a typo in the title. Resending.
On Wed, Jun 14, 2023 at 9:46 AM Azeem Shaikh <azeemshaikh38@gmail.com> 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 WIPHY_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>
> ---
> v1: https://lore.kernel.org/all/20230612232301.2572316-1-azeemshaikh38@gmail.com/
>
> Changes from v1 - updated patch title.
>
> net/wireless/trace.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/wireless/trace.h b/net/wireless/trace.h
> index 716a1fa70069..a00da3ebfed5 100644
> --- a/net/wireless/trace.h
> +++ b/net/wireless/trace.h
> @@ -22,7 +22,7 @@
>
> #define MAXNAME 32
> #define WIPHY_ENTRY __array(char, wiphy_name, 32)
> -#define WIPHY_ASSIGN strlcpy(__entry->wiphy_name, wiphy_name(wiphy), MAXNAME)
> +#define WIPHY_ASSIGN strscpy(__entry->wiphy_name, wiphy_name(wiphy), MAXNAME)
> #define WIPHY_PR_FMT "%s"
> #define WIPHY_PR_ARG __entry->wiphy_name
>
> --
> 2.41.0.162.gfafddb0af9-goog
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-06-14 13:47 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-14 13:45 [PATCH v2] wifi: cfg80211: replace strlcpy() with strlscpy() Azeem Shaikh
2023-06-14 13:47 ` Azeem Shaikh
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).