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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id ji21-20020a170903325500b001b392bf9192sm3789240plb.145.2023.09.22.10.51.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Sep 2023 10:51:43 -0700 (PDT) From: Kees Cook To: Helge Deller Cc: Kees Cook , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH] video: mmp: Annotate struct mmp_path with __counted_by Date: Fri, 22 Sep 2023 10:51:41 -0700 Message-Id: <20230922175141.work.450-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1140; i=keescook@chromium.org; h=from:subject:message-id; bh=H1/vE1vzDEkKr/pR9G2TlDq8I/0Pjxfcmq4WIBG2rX4=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlDdQtbAyYSxB3rtoiVITScXMw9/igQbzzli6cd 9NaF66HGJGJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZQ3ULQAKCRCJcvTf3G3A JgFvD/9aVhNFMXOLfYvQuvtNWdczuksf82WmWUjZ3XxnXA2fVtRIrmINsMubWXN5BqlzWb54JAd 2JvpfxjAjclOiZQ1TaC+xCzUTkoEbnWszJAT778l3qNuM+FynSmS8WJqcyfFWae6qACzw/UexAD JDEdStWGpO05F2Y+sgcCmf6rvfJS8A3MiilSGKaXl+xUHsXWS2iEBwRa4eiIE70ykhfR0HAMdXS L5qBSDWbXjlq0mui0yKkhE6H+xAA95ChwfuiVfcSp3s7uA5qT12D1BC9Cxy9TwGWQc/gzstl0q5 Act4VdII0lEJtWXvl4Sj9czaYZOIflGtUky/NbxfaXdyCXBldJ15O3hex7Gy+a7jRwaFIO5lP1l VrXKQwNlknIw7kLZsuScN9wJEkwbAkNtn2dNeXWJRIVDRZlEDYch+nmd1ma+pDKFjLccKHNVCyn srI+NBBV0w6HIUUfyqXhVfXNhpxbawfW88qpoywu/N71xmeTIdAbcNhW4F7jFKwwFPOz8+ib6PB htPR2uKXF1fwz05xPScZwFqkbtuiB5nzGhfpttxqXo6HjJpg3OuRsjckExbw4ipKW2dbuANjPVL n1Saavvp4yFM7FKZDSNxqVP/nSKD8kjtleMkQzEEJwmM4S/b0Fm0MbxtSCIKC/ed6tHkllPeipu NODokxp /mmGU/PQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@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 mmp_path. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Helge Deller Cc: linux-fbdev@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva --- include/video/mmp_disp.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/video/mmp_disp.h b/include/video/mmp_disp.h index 77252cb46361..a722dcbf5073 100644 --- a/include/video/mmp_disp.h +++ b/include/video/mmp_disp.h @@ -231,7 +231,7 @@ struct mmp_path { /* layers */ int overlay_num; - struct mmp_overlay overlays[]; + struct mmp_overlay overlays[] __counted_by(overlay_num); }; extern struct mmp_path *mmp_get_path(const char *name);