| Message ID | 20230613003458.3538812-1-azeemshaikh38@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 7edbd53a58a86c1d389e474a4f318cf2fdffa5ce |
| Delegated to: | Kalle Valo |
| Headers | show |
| Series | net/mediatek: strlcpy withreturn | expand |
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 DEV_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> The title should be: wifi: mt7601u: replace strlcpy() with strscpy() I can fix that, no need to resend because of this.
On Tue, Jun 13, 2023 at 4:35 AM Kalle Valo <kvalo@kernel.org> wrote: > > 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 DEV_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> > > The title should be: > > wifi: mt7601u: replace strlcpy() with strscpy() > > I can fix that, no need to resend because of this. > Thanks Kalle! > -- > https://patchwork.kernel.org/project/linux-wireless/patch/20230613003458.3538812-1-azeemshaikh38@gmail.com/ > > https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches >
On Tue, Jun 13, 2023 at 12:34:57AM +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 DEV_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> Yup double-checked the users of the macros. Looks good to me. Reviewed-by: Kees Cook <keescook@chromium.org>
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 DEV_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> Patch applied to wireless-next.git, thanks. 7edbd53a58a8 wifi: mt7601u: replace strlcpy() with strscpy()
diff --git a/drivers/net/wireless/mediatek/mt7601u/trace.h b/drivers/net/wireless/mediatek/mt7601u/trace.h index 5a6ba015085f..07696b672161 100644 --- a/drivers/net/wireless/mediatek/mt7601u/trace.h +++ b/drivers/net/wireless/mediatek/mt7601u/trace.h @@ -16,7 +16,7 @@ #define MAXNAME 32 #define DEV_ENTRY __array(char, wiphy_name, 32) -#define DEV_ASSIGN strlcpy(__entry->wiphy_name, \ +#define DEV_ASSIGN strscpy(__entry->wiphy_name, \ wiphy_name(dev->hw->wiphy), MAXNAME) #define DEV_PR_FMT "%s " #define DEV_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 DEV_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> --- drivers/net/wireless/mediatek/mt7601u/trace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)