[arm-soc:to-build 1/3] arch/x86/include/asm/thread_info.h:174:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe
kbuild test robot
fengguang.wu at intel.com
Wed Oct 12 15:06:26 PDT 2016
tree: https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git to-build
head: b0a8f2c6d232f3f8463955e5927c56dd057495b1
commit: 3ddcb978f68b765b3af38bf45bf4a1a4b0a87df1 [1/3] Revert "Disable "maybe-uninitialized" warning globally"
config: i386-randconfig-s1-201641 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 3ddcb978f68b765b3af38bf45bf4a1a4b0a87df1
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
In file included from include/linux/thread_info.h:69:0,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/gfp.h:5,
from include/linux/mm.h:9,
from mm/usercopy.c:17:
arch/x86/include/asm/thread_info.h: In function 'check_stack_object':
>> arch/x86/include/asm/thread_info.h:174:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
oldframe = __builtin_frame_address(1);
~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/thread_info.h:176:9: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
frame = __builtin_frame_address(2);
~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/__builtin_frame_address +174 arch/x86/include/asm/thread_info.h
0f60a8ef Kees Cook 2016-07-12 158 * Walks up the stack frames to make sure that the specified object is
0f60a8ef Kees Cook 2016-07-12 159 * entirely contained by a single stack frame.
0f60a8ef Kees Cook 2016-07-12 160 *
0f60a8ef Kees Cook 2016-07-12 161 * Returns:
0f60a8ef Kees Cook 2016-07-12 162 * 1 if within a frame
0f60a8ef Kees Cook 2016-07-12 163 * -1 if placed across a frame boundary (or outside stack)
0f60a8ef Kees Cook 2016-07-12 164 * 0 unable to determine (no frame pointers, etc)
0f60a8ef Kees Cook 2016-07-12 165 */
0f60a8ef Kees Cook 2016-07-12 166 static inline int arch_within_stack_frames(const void * const stack,
0f60a8ef Kees Cook 2016-07-12 167 const void * const stackend,
0f60a8ef Kees Cook 2016-07-12 168 const void *obj, unsigned long len)
0f60a8ef Kees Cook 2016-07-12 169 {
0f60a8ef Kees Cook 2016-07-12 170 #if defined(CONFIG_FRAME_POINTER)
0f60a8ef Kees Cook 2016-07-12 171 const void *frame = NULL;
0f60a8ef Kees Cook 2016-07-12 172 const void *oldframe;
0f60a8ef Kees Cook 2016-07-12 173
0f60a8ef Kees Cook 2016-07-12 @174 oldframe = __builtin_frame_address(1);
0f60a8ef Kees Cook 2016-07-12 175 if (oldframe)
0f60a8ef Kees Cook 2016-07-12 176 frame = __builtin_frame_address(2);
0f60a8ef Kees Cook 2016-07-12 177 /*
0f60a8ef Kees Cook 2016-07-12 178 * low ----------------------------------------------> high
0f60a8ef Kees Cook 2016-07-12 179 * [saved bp][saved ip][args][local vars][saved bp][saved ip]
0f60a8ef Kees Cook 2016-07-12 180 * ^----------------^
0f60a8ef Kees Cook 2016-07-12 181 * allow copies only within here
0f60a8ef Kees Cook 2016-07-12 182 */
:::::: The code at line 174 was first introduced by commit
:::::: 0f60a8efe4005ab5e65ce000724b04d4ca04a199 mm: Implement stack frame object validation
:::::: TO: Kees Cook <keescook at chromium.org>
:::::: CC: Kees Cook <keescook at chromium.org>
---
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https://lists.01.org/pipermail/kbuild-all Intel Corporation
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