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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id u12-20020a17090282cc00b001b8943b37a5sm223595plz.24.2023.08.17.14.15.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Aug 2023 14:15:32 -0700 (PDT) From: Kees Cook To: Johannes Berg Cc: Kees Cook , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH 3/7] wifi: cfg80211: Annotate struct cfg80211_mbssid_elems with __counted_by Date: Thu, 17 Aug 2023 14:15:25 -0700 Message-Id: <20230817211531.4193219-3-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230817211114.never.208-kees@kernel.org> References: <20230817211114.never.208-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2022; i=keescook@chromium.org; h=from:subject; bh=vaWHXmxPO1ptoIqyZPI0oaQtbTFkYHcNqPSrVLO+Cyo=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBk3o3x9Q72AWeO3iT9FoMZtrv2vw6MyWouRB7nh h1x+UnGyeSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZN6N8QAKCRCJcvTf3G3A JrUyEACKeu7bZ+6W17+6Csyy59kutbcaGWnWoZqfeNWCSYd8tAVhCczdJLuz9/B0R2QrXSpwu5n zpIIYGWYvFW7QaNN3Ygc4s35ySoSg3owW7TtTyaCr7IXyJoJ1XjqboBhARy1m1Xf2omjbw68BMf 7E2D+pVCSVklqLPDnXGQGvI+wuRpG+nlQMh+MkQ7gbU4cE+qrDf2VGKADgzzqFCCtNjsOsm02ho R3Fh6czL/VlwYTGdoI/cmyNjZVZkxHLTxOQvl+18zGC/2AbLsX7QRbFN0Qt5ky6gUa0PTo2fW3e Z2tQLZDcpZhxgLxNp9sF9eKAfzzQoT5V5oxZ4oXka86BlvZR6b+OgYyFq75wNqabtdhPK02OTmY trw7lr+vgki7yU+3+OErnwg0WAMENH7zVcC4WcnpIxwTxaVBM4oFEhytGPLPfNGyfXfUPT5JRen ygp8TcPbp1bgT6ITfxI+mP3vMVDrZy0w+385fFnq9xUyJYou6HIOzlr3PXaP0Ya82tLq4T4cKoF xOsW6OcFPLf2zsF2H/IvlbgWExJEV3XI0eIz7UXg1axO1xs3z76pyLB1ZwRuOxepVQ9hP2jHT69 3ihSRWYcbD7XS8UeaSsUR6HfR1YBJrG6hgR0zJDcMztj7DCNSiWrE2eolF9mGGG381h9598oL6j wLHKdDJFXPjvMAQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org 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_mbssid_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 Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Reviewed-by: Jeff Johnson --- 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 eb73b5af5d04..5c7d091b3925 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -1187,7 +1187,7 @@ struct cfg80211_mbssid_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 80633e815311..9ba4266368db 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -5438,13 +5438,13 @@ nl80211_parse_mbssid_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; }