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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id d8-20020a170902cec800b00186e2b3e12fsm2254854plg.261.2022.11.17.19.52.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Nov 2022 19:52:01 -0800 (PST) From: Kees Cook To: Vlastimil Babka Cc: Kees Cook , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v2 1/2] slab: Clean up SLOB vs kmalloc() definition Date: Thu, 17 Nov 2022 19:51:58 -0800 Message-Id: <20221118035200.1269184-1-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221118034713.gonna.754-kees@kernel.org> References: <20221118034713.gonna.754-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2026; h=from:subject; bh=XCqnPjfv4o/NKArWFRHDgYWfDTlT2kWs5IGt+A3wTyQ=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjdwFfTA7j/LHUkXVUp6HAaWlDXQgvh/IdCZT/aouq MnYGyIOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY3cBXwAKCRCJcvTf3G3AJp8VEA CnjcKb2iCpqmX0eLs3YrJn7gR2VmSD2hbc20QVLE5MxIZJBJgcap3GTy5i1qgCFw2KASeJLxX0fboz KIcE1Mw81hfNEkXWK6vKZ5xFg/pYKmvV6RV7AyQC947FQXvZIi0BaGFsNkS1H1zkCCkAeVMfN80mI0 1dX8ervJ42PpR9KAL7ySYtqYc5nKiffXK78XUMp0GBTZPg5qaurwfYUORKYh3QgkS5uq37EH6B5l0T uHDTLHL8dx2eDshTmfH5c+aw49XVD8zMUwoFc1A1jeD4exIqQHuOahoU0ZSyyjQW1LRXIQTuCzVJC/ o+tEaCPzfAVUa/qfEBHzHbRQW7rMwSguwAz0QAb+bdJLKrN7MR/LtheapmaVMGQjpjJU3Z3DPEt/wi Aq0IbtyxN6RooERZkVULRpRfS9DRzUv6YnmAXOhC0nXVnSVkHSGjOHyjnRfRDxizmrGvl2J0ZORyGE ehH2e6SDBf8yXy3C2gujb+9Xemv/Z2BxHV4BzI46EpD2x9xHZdgIoffQYFanYzr3R8BADb8voGurr+ PSgtL/PqvYl1cj6TsrtAgXAMpDc4VyT7rSMYo6rpO9XUYPhy9iH8YvnGWQ/R5/YwaqcOYjZ2Qq5KpN h6BaSq7PorQjdZiIwkoCEbhD9KEgyIBjAavfzOHXAo+MmXKGPmUKxMabAB2w== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" As already done for kmalloc_node(), clean up the #ifdef usage in the definition of kmalloc() so that the SLOB-only version is an entirely separate and much more readable function. Cc: Vlastimil Babka Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Andrew Morton Cc: Roman Gushchin Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: linux-mm@kvack.org Signed-off-by: Kees Cook Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- include/linux/slab.h | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/include/linux/slab.h b/include/linux/slab.h index 1c670c16c737..9033937c758e 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -558,15 +558,15 @@ void *kmalloc_large_node(size_t size, gfp_t flags, in= t node) __assume_page_align * Try really hard to succeed the allocation but fail * eventually. */ +#ifndef CONFIG_SLOB static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t fl= ags) { if (__builtin_constant_p(size)) { -#ifndef CONFIG_SLOB unsigned int index; -#endif + if (size > KMALLOC_MAX_CACHE_SIZE) return kmalloc_large(size, flags); -#ifndef CONFIG_SLOB + index =3D kmalloc_index(size); =20 if (!index) @@ -575,10 +575,18 @@ static __always_inline __alloc_size(1) void *kmalloc(= size_t size, gfp_t flags) return kmalloc_trace( kmalloc_caches[kmalloc_type(flags)][index], flags, size); -#endif } return __kmalloc(size, flags); } +#else +static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t fl= ags) +{ + if (__builtin_constant_p(size) && size > KMALLOC_MAX_CACHE_SIZE) + return kmalloc_large(size, flags); + + return __kmalloc(size, flags); +} +#endif =20 #ifndef CONFIG_SLOB static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp= _t flags, int node) --=20 2.34.1