Messages in this thread | | | Date | Mon, 26 Sep 2022 20:33:47 -0500 | From | "Gustavo A. R. Silva" <> | Subject | Re: [PATCH] wifi: nl80211: Split memcpy() of struct nl80211_wowlan_tcp_data_token flexible array |
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On Mon, Sep 26, 2022 at 05:39:03PM -0700, Kees Cook wrote: > To work around a misbehavior of the compiler's ability to see into > composite flexible array structs (as detailed in the coming memcpy() > hardening series[1]), split the memcpy() of the header and the payload > so no false positive run-time overflow warning will be generated. > > [1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org/ > > Cc: Johannes Berg <johannes@sipsolutions.net> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: linux-wireless@vger.kernel.org > Cc: netdev@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org> > --- > net/wireless/nl80211.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c > index 2705e3ee8fc4..461897933e92 100644 > --- a/net/wireless/nl80211.c > +++ b/net/wireless/nl80211.c > @@ -13171,7 +13171,8 @@ static int nl80211_parse_wowlan_tcp(struct cfg80211_registered_device *rdev, > wake_mask_size); > if (tok) { > cfg->tokens_size = tokens_size; > - memcpy(&cfg->payload_tok, tok, sizeof(*tok) + tokens_size); > + cfg->payload_tok = *tok; > + memcpy(cfg->payload_tok.token_stream, tok->token_stream, + tokens_size);
There is a spurious '+' here............................................^^^
-- Gustavo
> } > > trig->tcp = cfg; > -- > 2.34.1 >
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