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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id y25sm231806pfn.44.2020.12.02.16.44.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Dec 2020 16:44:46 -0800 (PST) From: Kees Cook To: Andrew Morton Cc: Kees Cook , Linus Torvalds , Nathan Chancellor , Ard Biesheuvel , Arnd Bergmann , Masahiro Yamada , Michal Marek , Nick Desaulniers , Marco Elver , Randy Dunlap , Dmitry Vyukov , George Popescu , Herbert Xu , Peter Oberparleiter , Andrey Ryabinin , clang-built-linux@googlegroups.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/7] ubsan: Disable object-size sanitizer under GCC Date: Wed, 2 Dec 2020 16:44:33 -0800 Message-Id: <20201203004437.389959-4-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201203004437.389959-1-keescook@chromium.org> References: <20201203004437.389959-1-keescook@chromium.org> MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=21c865d368e205cfd26bd9d13e0f9f89f171384b; i=L4GcuPKCev5MNqQc0RCGb8oc+Sj9uj4IyIr1ANDlbWc=; m=PBJG7bVEbrc41Z+BEj2wLGOXm7yrIzzNY1qvha6xoa8=; p=jGS9rva7ilUpon3Qx1DX+0oWwKBNC+al8p6dZtl31EM= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAl/INPMACgkQiXL039xtwCbIUQ/+OkV vjffTNt2uERV7vMRuPwpM9Ir02sn2AX3wrTDxTrLYtPKqDQ6Nv0c6If7kt/ix1Z9j6iPVez1vmnT7 N3DCeyorgb97zQFmYBlpuyEHsIix9bA2anZmEsjoB1l0ipZbjuPM2TiXeD+MppW23DcZkVyrhwXe5 ztJkUJ4H2yark/GEYoKKRqU99wCbLNkcd+UqpOEKZramY8SmOXaWZOrARgDtd9mEWSvQ5ZU0cFQxV cmki5bWEQ4VjPbJNFbICL19bQ67TR/fhZk8BkUbW0+YNozVxOCgkRA64YO+CZHnw3kUq5fcP0y/Dl VVqQ1VAvlBXwSZxjrbZxfdY7PtVGDkIUwuWqECT0wgn0Uv8KYFVPABjnI379t1+JrPiQ338pGRCIJ yL5xJCYeuZOKTFinRoko5o9qODMwVFpx/3CAmafnoItqQ9mrD9Oo/a3sCliuPaXSD1Dn6+ISruKdm s1Tv5MeTaEMHnAnsCgr7ZPExglNSNE2hhlciEJhqcOsad6qivPuIoeVt1qIQxfHMhZv56BH15ndSZ zvn0HcwnYU87shYo5CmlStdL4qMi+TaX9t8zUmiAt4mgDgWnzcD9h04B5WKo6Uf0+AaaDUjJd+ZmZ BuA2kGzeINXkrbt45W/br+R2YMpnWBFPx8go/Psajs84OaxalYGLC2AGy0MzUeVQ= Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org GCC's -fsanitize=object-size (as part of CONFIG_UBSAN_MISC) greatly increases stack utilization. Do not allow this under GCC. Suggested-by: Linus Torvalds Link: https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@mail.gmail.com/ Reviewed-by: Nathan Chancellor Signed-off-by: Kees Cook --- lib/Kconfig.ubsan | 3 +++ 1 file changed, 3 insertions(+) diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan index 05147112b355..4190a99b1eaa 100644 --- a/lib/Kconfig.ubsan +++ b/lib/Kconfig.ubsan @@ -113,6 +113,9 @@ config UBSAN_UNSIGNED_OVERFLOW config UBSAN_OBJECT_SIZE def_bool UBSAN_MISC + # gcc hugely expands stack usage with -fsanitize=object-size + # https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@mail.gmail.com/ + depends on !CC_IS_GCC depends on $(cc-option,-fsanitize=object-size) config UBSAN_BOOL -- 2.25.1