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Message-ID: <0e75f94b-0322-cca4-d720-efc784b385e8@embeddedor.com> Date: Sun, 1 Oct 2023 08:37:06 +0200 From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> To: Kees Cook <keescook@...omium.org>, Raju Rangoju <rajur@...lsio.com> Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, "Gustavo A. R. Silva" <gustavoars@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, llvm@...ts.linux.dev Subject: Re: [PATCH 5/5] cxgb4: Annotate struct smt_data with __counted_by On 9/29/23 20:11, 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 smt_data. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Raju Rangoju <rajur@...lsio.com> > Cc: "David S. Miller" <davem@...emloft.net> > Cc: Eric Dumazet <edumazet@...gle.com> > Cc: Jakub Kicinski <kuba@...nel.org> > Cc: Paolo Abeni <pabeni@...hat.com> > Cc: netdev@...r.kernel.org > Signed-off-by: Kees Cook <keescook@...omium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org> Thanks -- Gustavo > --- > drivers/net/ethernet/chelsio/cxgb4/smt.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/chelsio/cxgb4/smt.h b/drivers/net/ethernet/chelsio/cxgb4/smt.h > index 541249d78914..109c1dff563a 100644 > --- a/drivers/net/ethernet/chelsio/cxgb4/smt.h > +++ b/drivers/net/ethernet/chelsio/cxgb4/smt.h > @@ -66,7 +66,7 @@ struct smt_entry { > struct smt_data { > unsigned int smt_size; > rwlock_t lock; > - struct smt_entry smtab[]; > + struct smt_entry smtab[] __counted_by(smt_size); > }; > > struct smt_data *t4_init_smt(void);
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