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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id g9-20020aa79f09000000b005383a0d9699sm13685497pfr.144.2022.09.07.16.43.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Sep 2022 16:43:48 -0700 (PDT) From: Kees Cook To: Yoshinori Sato Cc: Kees Cook , Rich Felker , linux-sh@vger.kernel.org, Geert Uytterhoeven , Paul Mundt , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] sh: machvec: Use char[] for section boundaries Date: Wed, 7 Sep 2022 16:43:45 -0700 Message-Id: <20220907234345.96798-1-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2689; h=from:subject; bh=VZiYjvR44EJrL43OjO6/kVB+zyBxpEcmV4VSvS2gY7M=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjGSyxwU78M7qHr/kbU1BnTKhKqsZPN/KhR7KHhdww LvoofFGJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYxkssQAKCRCJcvTf3G3AJsjWD/ 4z6YJ8958oetqjO+jDQOZ2cNv/kH8FvINrvfVQFDDaG6itCtm0ruTe//BckDtNgrIsE8RTbpqZqzz4 mvFqC8DXT/wcD5gOGJU7OHekgCcCdp3DaKc7a7Rn/LTBmF9HzGFMH8ADMhIyxjWjR3Uvlu8Jn8Qz4b ZCcML8jrACpc/GTQ1p7+PecKedfNWbgnQyxjG/6SOsm3IhAIMV57PJD8fu/0bmNBEy/0OxNGq0nmXW 35TfEPm7THDj40axqRfQUCz/gbdaq6xXwRRcP0lK07zlTJc6DvPBXOl2XyTvY9YJ4J0c6Pj3fZVCjs bdHEHwztvuGun0roSCrzLXYDfyaHr6X++J4eIEU4QjT0bECMNj+frRpkrov1532EdC+Tc/WpQFpuRp lHyBW4J039trGwcxkOIiOyrzVlbt1d5h7rjxdGf3RtXOmy9zh/mJ8Qs6sYPE5RxD5psD/vMuyCPH3G XBWsA2MPs+UEw/lVAvfoMFK41fSI2gk2n92oSx8syex76Rsn1VqSLsE5YNorGItHTVOlwSU+8TkgeG sf90gM9mgEgtNkt826mC5WBXRSz4dTb7DpXvUkBgd6am3EkwSMXKzMJppV/YxPXLXviBebWiGzjnxT ZO+k2/uOYd5d3mL2euZSYi7z9I0qR1ZZplqgFnxzqjaigMsiEJCkLiECxOXg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org As done for other sections, define the extern as a character array, which relaxes many of the compiler-time object size checks, which would otherwise assume it's a single long. Solves the following build error: arch/sh/kernel/machvec.c: error: array subscript 'struct sh_machine_vector[0]' is partly outside array bounds of 'long int[1]' [-Werror=array-bounds]: => 105:33 Cc: Yoshinori Sato Cc: Rich Felker Cc: linux-sh@vger.kernel.org Reported-by: Geert Uytterhoeven Link: https://lore.kernel.org/lkml/alpine.DEB.2.22.394.2209050944290.964530@ramsan.of.borg/ Fixes: 9655ad03af2d ("sh: Fixup machvec support.") Signed-off-by: Kees Cook --- arch/sh/include/asm/sections.h | 2 +- arch/sh/kernel/machvec.c | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/sh/include/asm/sections.h b/arch/sh/include/asm/sections.h index 8edb824049b9..0cb0ca149ac3 100644 --- a/arch/sh/include/asm/sections.h +++ b/arch/sh/include/asm/sections.h @@ -4,7 +4,7 @@ #include -extern long __machvec_start, __machvec_end; +extern char __machvec_start[], __machvec_end[]; extern char __uncached_start, __uncached_end; extern char __start_eh_frame[], __stop_eh_frame[]; diff --git a/arch/sh/kernel/machvec.c b/arch/sh/kernel/machvec.c index d606679a211e..57efaf5b82ae 100644 --- a/arch/sh/kernel/machvec.c +++ b/arch/sh/kernel/machvec.c @@ -20,8 +20,8 @@ #define MV_NAME_SIZE 32 #define for_each_mv(mv) \ - for ((mv) = (struct sh_machine_vector *)&__machvec_start; \ - (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \ + for ((mv) = (struct sh_machine_vector *)__machvec_start; \ + (mv) && (unsigned long)(mv) < (unsigned long)__machvec_end; \ (mv)++) static struct sh_machine_vector * __init get_mv_byname(const char *name) @@ -87,8 +87,8 @@ void __init sh_mv_setup(void) if (!machvec_selected) { unsigned long machvec_size; - machvec_size = ((unsigned long)&__machvec_end - - (unsigned long)&__machvec_start); + machvec_size = ((unsigned long)__machvec_end - + (unsigned long)__machvec_start); /* * Sanity check for machvec section alignment. Ensure @@ -102,7 +102,7 @@ void __init sh_mv_setup(void) * vector (usually the only one) from .machvec.init. */ if (machvec_size >= sizeof(struct sh_machine_vector)) - sh_mv = *(struct sh_machine_vector *)&__machvec_start; + sh_mv = *(struct sh_machine_vector *)__machvec_start; } pr_notice("Booting machvec: %s\n", get_system_type()); -- 2.34.1