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Message-ID: <3527897d-6fb1-7fa0-ac8d-7a53f4d00fe4@embeddedor.com> Date: Sat, 23 Sep 2023 10:25:50 -0600 From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> To: Kees Cook <keescook@...omium.org>, Michael Tretter <m.tretter@...gutronix.de> Cc: Pengutronix Kernel Team <kernel@...gutronix.de>, Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, linux-hardening@...r.kernel.org Subject: Re: [PATCH] media: allegro: Annotate struct mcu_msg_push_buffers_internal with __counted_by On 9/22/23 11:49, 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 mcu_msg_push_buffers_internal. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Michael Tretter <m.tretter@...gutronix.de> > Cc: Pengutronix Kernel Team <kernel@...gutronix.de> > Cc: Mauro Carvalho Chehab <mchehab@...nel.org> > Cc: linux-media@...r.kernel.org > Signed-off-by: Kees Cook <keescook@...omium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org> Thanks -- Gustavo > --- > drivers/media/platform/allegro-dvt/allegro-mail.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/media/platform/allegro-dvt/allegro-mail.h b/drivers/media/platform/allegro-dvt/allegro-mail.h > index a5686058d754..c0c9013f1aab 100644 > --- a/drivers/media/platform/allegro-dvt/allegro-mail.h > +++ b/drivers/media/platform/allegro-dvt/allegro-mail.h > @@ -184,7 +184,7 @@ struct mcu_msg_push_buffers_internal { > struct mcu_msg_header header; > u32 channel_id; > size_t num_buffers; > - struct mcu_msg_push_buffers_internal_buffer buffer[]; > + struct mcu_msg_push_buffers_internal_buffer buffer[] __counted_by(num_buffers); > }; > > struct mcu_msg_put_stream_buffer {
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