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Message-ID: <d152533b-e4a8-4881-a10b-31835d3a32d9@embeddedor.com> Date: Fri, 6 Oct 2023 22:49:20 +0200 From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> To: Kees Cook <keescook@...omium.org>, Christian Lamparter <chunkeey@...glemail.com> Cc: Kalle Valo <kvalo@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-wireless@...r.kernel.org, linux-hardening@...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 Subject: Re: [PATCH] wifi: p54: Annotate struct p54_cal_database with __counted_by On 10/6/23 22:17, 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 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 p54_cal_database. > > Cc: Christian Lamparter <chunkeey@...glemail.com> > Cc: Kalle Valo <kvalo@...nel.org> > Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org> > Cc: linux-wireless@...r.kernel.org > Cc: linux-hardening@...r.kernel.org > Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] > Signed-off-by: Kees Cook <keescook@...omium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org> Thanks! -- Gustavo > --- > drivers/net/wireless/intersil/p54/p54.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/wireless/intersil/p54/p54.h b/drivers/net/wireless/intersil/p54/p54.h > index 3356ea708d81..770e348d1f6c 100644 > --- a/drivers/net/wireless/intersil/p54/p54.h > +++ b/drivers/net/wireless/intersil/p54/p54.h > @@ -126,7 +126,7 @@ struct p54_cal_database { > size_t entry_size; > size_t offset; > size_t len; > - u8 data[]; > + u8 data[] __counted_by(entries); > }; > > #define EEPROM_READBACK_LEN 0x3fc
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