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Date: Tue, 5 Oct 2021 18:47:17 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Kees Cook <keescook@...omium.org> Cc: Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Vlastimil Babka <vbabka@...e.cz>, Andy Whitcroft <apw@...onical.com>, Dennis Zhou <dennis@...nel.org>, Dwaipayan Ray <dwaipayanray1@...il.com>, Joe Perches <joe@...ches.com>, Lukas Bulwahn <lukas.bulwahn@...il.com>, Miguel Ojeda <ojeda@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Tejun Heo <tj@...nel.org>, Daniel Micay <danielmicay@...il.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Masahiro Yamada <masahiroy@...nel.org>, Michal Marek <michal.lkml@...kovi.net>, clang-built-linux@...glegroups.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH v3 4/8] slab: Add __alloc_size attributes for better bounds checking On Thu, 30 Sep 2021 15:27:00 -0700 Kees Cook <keescook@...omium.org> wrote: > As already done in GrapheneOS, add the __alloc_size attribute for regular > kmalloc interfaces, to provide additional hinting for better bounds > checking, assisting CONFIG_FORTIFY_SOURCE and other compiler > optimizations. x86_64 allmodconfig: In file included from ./arch/x86/include/asm/preempt.h:7, from ./include/linux/preempt.h:78, from ./include/linux/spinlock.h:55, from ./include/linux/mmzone.h:8, from ./include/linux/gfp.h:6, from ./include/linux/mm.h:10, from ./include/linux/mman.h:5, from lib/test_kasan_module.c:10: In function 'check_copy_size', inlined from 'copy_user_test' at ./include/linux/uaccess.h:191:6: ./include/linux/thread_info.h:213:4: error: call to '__bad_copy_to' declared with attribute error: copy destination size is too small 213 | __bad_copy_to(); | ^~~~~~~~~~~~~~~ In function 'check_copy_size', inlined from 'copy_user_test' at ./include/linux/uaccess.h:199:6: ./include/linux/thread_info.h:211:4: error: call to '__bad_copy_from' declared with attribute error: copy source size is too small 211 | __bad_copy_from(); | ^~~~~~~~~~~~~~~~~ make[1]: *** [lib/test_kasan_module.o] Error 1 make: *** [lib] Error 2
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