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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id p30sm771381pfh.116.2021.08.18.14.40.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 14:40:39 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Daniel Micay , Dennis Zhou , Tejun Heo , Christoph Lameter , linux-mm@kvack.org, Joe Perches , Miguel Ojeda , Nathan Chancellor , Nick Desaulniers , Andy Whitcroft , Dwaipayan Ray , Lukas Bulwahn , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka , Masahiro Yamada , Michal Marek , clang-built-linux@googlegroups.com, linux-kbuild@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v2 6/7] percpu: Add __alloc_size attributes for better bounds checking Date: Wed, 18 Aug 2021 14:40:20 -0700 Message-Id: <20210818214021.2476230-7-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818214021.2476230-1-keescook@chromium.org> References: <20210818214021.2476230-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1590; h=from:subject; bh=ekTvmEitMMQysLPDeBX8i89VfgDCF2rtfdT6Z6IUx4A=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHX5EsqlEW2vfPq2eFmV43wt3rhdXc8JsXzXAcFu/ K19rrryJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYR1+RAAKCRCJcvTf3G3AJuxtD/ 9NUGRG0V5AKk7qevvbKJ8t28yDZ6RZ0La8S1XLLAg61jPfECQvj6pVLv5NrDYtQMSbnwdh77FUg+II vLCH66LG8N2MwxQgbX7gtAfkcv2VV1dChGUbDODhzCKYU1ggZbOz55qV09DiWOCHE04y5LSlABcay2 1Di10cEmBP3LyrcM45UIOvl3fbc5iewqMqz/g2BZSmbGC0jJG1QjOvQezGZvid6TmQozA6VJ7oUJTA yQQ3KaPMNrueSUKmqwe/B5/sBXvgGM1hOSVjuZNFgLeL2Eb4qMJnukSGWxaIHY8JYpT1kMog9OOfD4 ngnPNYTprHzGVHq8wPzJOcfaQ9ZBKsSRM9Sn6mpGfrpqF8+WRID4zn/Vdcz2m8k3AEgPaTs3DWOhq5 9VYp9XI5i5dvtDnlooedZt4ux8Bdv6+JD8e8zwBf+w7uONbj0PU4iq2Kax/B1F8tDOvHyflWvwlQxb nd5XW7tez+VJqv0r+Vi5cyZ9Z4txtiC3cepvO5YiFD/vsyFKB59HnScAAvwClZTYHb+u8xWLrElSDk t8qKonk8l3+uGZueDC8sHGMVtV+lqxYbD10EMx46FGmrtbEBZT/shTf8vQllIDghYvHfEzL9ymZtxG jGGWnPlILGujzSofOTeKoJvJHLxS+LelzhTaK2IdytAHBhi4QsOwxZZNtx8g== 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 As already done in GrapheneOS, add the __alloc_size attribute for appropriate percpu allocator interfaces, to provide additional hinting for better bounds checking, assisting CONFIG_FORTIFY_SOURCE and other compiler optimizations. Co-developed-by: Daniel Micay Signed-off-by: Daniel Micay Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: linux-mm@kvack.org Signed-off-by: Kees Cook --- include/linux/percpu.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 5e76af742c80..119f41815b32 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -123,6 +123,7 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_populate_pte_fn_t populate_pte_fn); #endif +__alloc_size(1) extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr); extern bool is_kernel_percpu_address(unsigned long addr); @@ -131,7 +132,9 @@ extern bool is_kernel_percpu_address(unsigned long addr); extern void __init setup_per_cpu_areas(void); #endif +__alloc_size(1) extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp); +__alloc_size(1) extern void __percpu *__alloc_percpu(size_t size, size_t align); extern void free_percpu(void __percpu *__pdata); extern phys_addr_t per_cpu_ptr_to_phys(void *addr); -- 2.30.2