tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core head: c4dfe2b515b510d7db6858c14f9b2492130a543b commit: 589bcab3e46636fc4fb4f56b3f51adba98f50ee0 [1/2] seqlock,headers: Untangle the spaghetti monster config: i386-randconfig-a014-20200731 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout 589bcab3e46636fc4fb4f56b3f51adba98f50ee0 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/x86/include/asm/smp.h:18, from arch/x86/include/asm/apic.h:485, from arch/x86/kernel/apic/local.h:13, from arch/x86/kernel/apic/ipi.c:6: arch/x86/include/asm/thread_info.h: In function 'arch_within_stack_frames': 208 | GOOD_FRAME : BAD_STACK; | ^~~~~~~~~~ arch/x86/include/asm/thread_info.h:208:5: note: each undeclared identifier is reported only once for each function it appears in 208 | GOOD_FRAME : BAD_STACK; | ^~~~~~~~~ arch/x86/kernel/apic/ipi.c: At top level: arch/x86/kernel/apic/ipi.c:315:5: warning: no previous prototype for 'safe_smp_processor_id' [-Wmissing-prototypes] 315 | int safe_smp_processor_id(void) | ^~~~~~~~~~~~~~~~~~~~~ -- In file included from arch/x86/include/asm/smp.h:18, from arch/x86/include/asm/apic.h:485, from arch/x86/kernel/apic/probe_32.c:13: arch/x86/include/asm/thread_info.h: In function 'arch_within_stack_frames': 208 | GOOD_FRAME : BAD_STACK; | ^~~~~~~~~~ arch/x86/include/asm/thread_info.h:208:5: note: each undeclared identifier is reported only once for each function it appears in 208 | GOOD_FRAME : BAD_STACK; | ^~~~~~~~~ vim +/GOOD_FRAME +208 arch/x86/include/asm/thread_info.h 2052e8d40ad58b1 include/asm-x86/thread_info.h Christoph Lameter 2008-05-12 172 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 173 /* 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 174 * Walks up the stack frames to make sure that the specified object is 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 175 * entirely contained by a single stack frame. 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 176 * 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 177 * Returns: 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 178 * GOOD_FRAME if within a frame 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 179 * BAD_STACK if placed across a frame boundary (or outside stack) 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 180 * NOT_STACK unable to determine (no frame pointers, etc) 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 181 */ 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 182 static inline int arch_within_stack_frames(const void * const stack, 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 183 const void * const stackend, 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 184 const void *obj, unsigned long len) 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 185 { 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 186 #if defined(CONFIG_FRAME_POINTER) 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 187 const void *frame = NULL; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 188 const void *oldframe; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 189 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 190 oldframe = __builtin_frame_address(1); 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 191 if (oldframe) 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 192 frame = __builtin_frame_address(2); 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 193 /* 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 194 * low ----------------------------------------------> high 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 195 * [saved bp][saved ip][args][local vars][saved bp][saved ip] 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 196 * ^----------------^ 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 197 * allow copies only within here 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 198 */ 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 199 while (stack <= frame && frame < stackend) { 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 200 /* 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 201 * If obj + len extends past the last frame, this 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 202 * check won't pass and the next frame will be 0, 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 203 * causing us to bail out and correctly report 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 204 * the copy as invalid. 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 205 */ 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 206 if (obj + len <= frame) 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 207 return obj >= oldframe + 2 * sizeof(void *) ? 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 @208 GOOD_FRAME : BAD_STACK; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 209 oldframe = frame; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 210 frame = *(const void * const *)frame; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 211 } 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 212 return BAD_STACK; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 213 #else 96dc4f9fb64690f arch/x86/include/asm/thread_info.h Sahara 2017-02-16 214 return NOT_STACK; 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 215 #endif 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 216 } 0f60a8efe4005ab arch/x86/include/asm/thread_info.h Kees Cook 2016-07-12 217 :::::: The code at line 208 was first introduced by commit :::::: 96dc4f9fb64690fc34410415fd1fc609cf803f61 usercopy: Move enum for arch_within_stack_frames() :::::: TO: Sahara <keun-o.park(a)darkmatter.ae&gt; :::::: CC: Kees Cook <keescook(a)chromium.org&gt; 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