Re: [PATCH] wifi: ipw2x00: Annotate struct libipw_txb with __counted_by
On 9/15/23 14:06, Kees Cook wrote: Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct libipw_txb. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Stanislav Yakovlev Cc: Kalle Valo Cc: linux-wirel...@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Thanks -- Gustavo --- drivers/net/wireless/intel/ipw2x00/libipw.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/ipw2x00/libipw.h b/drivers/net/wireless/intel/ipw2x00/libipw.h index bec7bc273748..9065ca5b0208 100644 --- a/drivers/net/wireless/intel/ipw2x00/libipw.h +++ b/drivers/net/wireless/intel/ipw2x00/libipw.h @@ -488,7 +488,7 @@ struct libipw_txb { u8 reserved; u16 frag_size; u16 payload_size; - struct sk_buff *fragments[]; + struct sk_buff *fragments[] __counted_by(nr_frags); }; /* SWEEP TABLE ENTRIES NUMBER */
[PATCH] wifi: ipw2x00: Annotate struct libipw_txb with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct libipw_txb. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Stanislav Yakovlev Cc: Kalle Valo Cc: linux-wirel...@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/wireless/intel/ipw2x00/libipw.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/ipw2x00/libipw.h b/drivers/net/wireless/intel/ipw2x00/libipw.h index bec7bc273748..9065ca5b0208 100644 --- a/drivers/net/wireless/intel/ipw2x00/libipw.h +++ b/drivers/net/wireless/intel/ipw2x00/libipw.h @@ -488,7 +488,7 @@ struct libipw_txb { u8 reserved; u16 frag_size; u16 payload_size; - struct sk_buff *fragments[]; + struct sk_buff *fragments[] __counted_by(nr_frags); }; /* SWEEP TABLE ENTRIES NUMBER */ -- 2.34.1