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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id w18-20020aa78592000000b0064f76992905sm1879945pfn.202.2023.10.06.13.17.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Oct 2023 13:17:02 -0700 (PDT) From: Kees Cook To: Song Liu Cc: Kees Cook , Jiri Olsa , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , "Gustavo A. R. Silva" , bpf@vger.kernel.org, linux-hardening@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] bpf: Annotate struct bpf_stack_map with __counted_by Date: Fri, 6 Oct 2023 13:17:00 -0700 Message-Id: <20231006201657.work.531-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1619; i=keescook@chromium.org; h=from:subject:message-id; bh=Cn0rZ3uKUzlAqWZVBxaI1s9wb/BhJmGzsMuyAyrT7Jg=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlIGs8PUE7GHQQH9B2FtvPO9v/D7n9b+rl68H2W RKqjf8h0JKJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZSBrPAAKCRCJcvTf3G3A JtaTEACURo4jMkXwmgS7m4ShxZQ4TwAfA6ZzmjYsh6vYRU9jgLzxlVmFZGarKW2zf9Cv86qoTQB OuLpPhBaNyLhx6zEvR7V9tnxUwEkqNowljuks8/uiTM7dKUMCX8mPrr0W8i7NY3rag314m42553 4Qg7E6CGkIv9FjnVwEy+WwyO4gtQ9T6LSBaDiqznryLw4DMRHSPX5FY1RreXN0hu2KlSN6NE/95 6y+nhBnSpe5AG0WcCaKwduCSLQAYDwu5gSLTQC8ufTlI+8wLVB9RxmJVplQ6ifVtmjwG0mal2Q9 g4CWK58aEl82E6jwl1ibHfcGfj1BOPSrjGWgcVRQGS4Oz95mMtS36TUv3GF/NGMEYbeVMSAOYF/ dZ+ZDcDelDkkrftFCQ0GblqS/FPjlacGmdkA99CUVIKR0c9Dwzz2pJCPVrLvu/vVGqSoU2DKd2O S/u5edTIQKXF+6S74bRXmCTvYDFgRzeDFVbxJ/gKxodnhRJZOwKgzpFeqz2h5A2DjvMkysoTOLr QgNDS9ZfejJ6ptqnkCoFaLOYYEdwTTjLQ/2vQ0ruMLTLZWT6fYMQYrP/Cd9bfrPxcuNg6YA1iqv 5A2La5ev+YTxG4cMliYTclB/18XZ5/C74z+hmZYBC6SCICu7BofIrV+WBsrWOqzu+iMD2dRwPe0 DtdkIXf jUFo8IGQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 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 bpf_stack_map. Cc: Song Liu Cc: Jiri Olsa Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Andrii Nakryiko Cc: Martin KaFai Lau Cc: Yonghong Song Cc: John Fastabend Cc: KP Singh Cc: Stanislav Fomichev Cc: Hao Luo Cc: "Gustavo A. R. Silva" Cc: bpf@vger.kernel.org Cc: linux-hardening@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook --- kernel/bpf/stackmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index 458bb80b14d5..d6b277482085 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -28,7 +28,7 @@ struct bpf_stack_map { void *elems; struct pcpu_freelist freelist; u32 n_buckets; - struct stack_map_bucket *buckets[]; + struct stack_map_bucket *buckets[] __counted_by(n_buckets); }; static inline bool stack_map_use_build_id(struct bpf_map *map) -- 2.34.1