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Message-ID: <6ac74722-1516-b1f1-5723-00e624beeb89@embeddedor.com> Date: Thu, 17 Aug 2023 15:24:26 -0600 From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> To: Kees Cook <keescook@...omium.org>, Johannes Berg <johannes@...solutions.net> Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, linux-wireless@...r.kernel.org, netdev@...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 5/7] wifi: cfg80211: Annotate struct cfg80211_rnr_elems with __counted_by On 8/17/23 15:15, 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 cfg80211_rnr_elems. > Additionally, since the element count member must be set before accessing > the annotated flexible array member, move its initialization earlier. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Johannes Berg <johannes@...solutions.net> > 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: linux-wireless@...r.kernel.org > Cc: netdev@...r.kernel.org > Signed-off-by: Kees Cook <keescook@...omium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org> Thanks -- Gustavo > --- > include/net/cfg80211.h | 2 +- > net/wireless/nl80211.c | 2 +- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h > index e9ca4726a732..6efe216c01d2 100644 > --- a/include/net/cfg80211.h > +++ b/include/net/cfg80211.h > @@ -1204,7 +1204,7 @@ struct cfg80211_rnr_elems { > struct { > const u8 *data; > size_t len; > - } elem[]; > + } elem[] __counted_by(cnt); > }; > > /** > diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c > index 9ba4266368db..0ffebf1a1eb6 100644 > --- a/net/wireless/nl80211.c > +++ b/net/wireless/nl80211.c > @@ -5470,13 +5470,13 @@ nl80211_parse_rnr_elems(struct wiphy *wiphy, struct nlattr *attrs, > elems = kzalloc(struct_size(elems, elem, num_elems), GFP_KERNEL); > if (!elems) > return ERR_PTR(-ENOMEM); > + elems->cnt = num_elems; > > nla_for_each_nested(nl_elems, attrs, rem_elems) { > elems->elem[i].data = nla_data(nl_elems); > elems->elem[i].len = nla_len(nl_elems); > i++; > } > - elems->cnt = num_elems; > return elems; > } >
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