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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id 16sm7186480pje.34.2022.02.02.14.18.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Feb 2022 14:18:27 -0800 (PST) From: Kees Cook To: Richard Henderson Cc: Kees Cook , Ivan Kokshaysky , Matt Turner , Guenter Roeck , Arnd Bergmann , linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] alpha: Silence -Warray-bounds warnings Date: Wed, 2 Feb 2022 14:18:25 -0800 Message-Id: <20220202221825.931307-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2488; h=from:subject; bh=T4ptorLGoemf/N9SvJlurYPJLNHVXVaxTruje8+ZTVU=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBh+wMwVDvf/S5SQmKa7J4cxYmsmNmgiJhrn+a3t0pd Yygy+p+JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYfsDMAAKCRCJcvTf3G3AJvsSEA CKC4WWfVamcX7i35UpZ2lDxhsQwdSv/5qzBy2LdZhyiOgXuC12Pnx4PPn3+4VUG7xCLWyH37ZzgQ71 F1V/7Xca8i1yu3zv7y+RYB+YdRoPIpnBPnOca0LbhhHc+siw6OfnrmP6BP9Dvr61Nh2m5MIVzVYsWt 8pPJyhf16eUuElmyLeAreuxPTsQo9J3NVA1fQ2di1NKwUV9vjlyZkopP6ecNSA1im2+X0S4mSiQDad bwUiRznB6RKGc/rKyN2gc6sxqoyNDw2zhTgakL6e/FsAmdrzpV8LulwAj698o0nms8jN/NINov16FP P/zwZBkT26aKCIFxXNF+FqvxZDueM6yXSjDuY2UtVxOTWP4KDMYv2fmLYIY/4+5Lx4pwRH1mlPZB3Z e2Uk/1nSjO0m1CaJ+Cr1uWYNGRmExqiILZMiOXvAck3E/aVvjGpiTU5eVlLcsUGMg2aJ/WCBfxYnHP UyBprgl0SfjbCZKKlAZrID3KqLHZu4FRAt15ZpMlB4ABGPaiBrMprDyKMoPqwYUrzCzIaarsXV90Vz 4DwP4CAh1BMsUH03aD0mF64aaV0LGEQhrhFhRbgu+OBMyCqcJOpb65kbedFPUbzopfOmelbZ1ozBAF XOHE95FqQI/0pBAPCo2Ko3xESmQaE2Uoi1++3FeH5sRMfCch2oehzmMKik8g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org GCC 11 (incorrectly[1]) assumes that literal values cast to (void *) should be treated like a NULL pointer with an offset, and raises diagnostics when doing bounds checking: In function '__memset', inlined from '__bad_pagetable' at arch/alpha/mm/init.c:79:2: ./arch/alpha/include/asm/string.h:37:32: error: '__builtin_memset' offset [0, 8191] is out of the bounds [0, 0] [-Werror=array-bounds] 37 | return __builtin_memset(s, c, n); | ^~~~~~~~~~~~~~~~~~~~~~~~~ In function '__memset', inlined from '__bad_page' at arch/alpha/mm/init.c:86:2: ./arch/alpha/include/asm/string.h:37:32: error: '__builtin_memset' offset [0, 8191] is out of the bounds [0, 0] [-Werror=array-bounds] 37 | return __builtin_memset(s, c, n); | ^~~~~~~~~~~~~~~~~~~~~~~~~ In function '__memset', inlined from 'paging_init' at arch/alpha/mm/init.c:256:2: ./arch/alpha/include/asm/string.h:37:32: error: '__builtin_memset' offset [0, 8191] is out of the bounds [0, 0] [-Werror=array-bounds] 37 | return __builtin_memset(s, c, n); This has been solved in other places[2] already by using the recently added absolute_pointer() macro. Do the same here. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578 [2] https://lore.kernel.org/all/20210912160149.2227137-1-linux@roeck-us.net/ Signed-off-by: Kees Cook --- arch/alpha/mm/init.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c index f6114d03357c..7511723b7669 100644 --- a/arch/alpha/mm/init.c +++ b/arch/alpha/mm/init.c @@ -76,14 +76,14 @@ pgd_alloc(struct mm_struct *mm) pmd_t * __bad_pagetable(void) { - memset((void *) EMPTY_PGT, 0, PAGE_SIZE); + memset(absolute_pointer(EMPTY_PGT), 0, PAGE_SIZE); return (pmd_t *) EMPTY_PGT; } pte_t __bad_page(void) { - memset((void *) EMPTY_PGE, 0, PAGE_SIZE); + memset(absolute_pointer(EMPTY_PGE), 0, PAGE_SIZE); return pte_mkdirty(mk_pte(virt_to_page(EMPTY_PGE), PAGE_SHARED)); } @@ -253,7 +253,7 @@ void __init paging_init(void) free_area_init(max_zone_pfn); /* Initialize the kernel's ZERO_PGE. */ - memset((void *)ZERO_PGE, 0, PAGE_SIZE); + memset(absolute_pointer(ZERO_PGE), 0, PAGE_SIZE); } #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM) -- 2.30.2