1 // Test ASan detection of stack-overflow condition when Linux sends SIGBUS. 2 3 // RUN: %clangxx_asan -O0 %s -o %t && %env_asan_opts=use_sigaltstack=1 not %run %t 2>&1 | FileCheck %s 4 5 // Issue #109771 6 // XFAIL: target={{sparc.*-.*-linux.*}} 7 8 #include <assert.h> 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 #include <unistd.h> 13 #include <sys/mman.h> 14 #include <sys/resource.h> 15 16 const int BS = 1024; 17 volatile char x; 18 volatile int y = 1; 19 20 void recursive_func(char *p) { 21 char buf[BS]; 22 buf[rand() % BS] = 1; 23 buf[rand() % BS] = 2; 24 x = buf[rand() % BS]; 25 if (y) 26 recursive_func(buf); 27 x = 1; // prevent tail call optimization 28 // CHECK: {{stack-overflow on address 0x.* \(pc 0x.* bp 0x.* sp 0x.* T.*\)}} 29 } 30 31 void LimitStackAndReexec(int argc, char **argv) { 32 struct rlimit rlim; 33 int res = getrlimit(RLIMIT_STACK, &rlim); 34 assert(res == 0); 35 if (rlim.rlim_cur == RLIM_INFINITY) { 36 rlim.rlim_cur = 256 * 1024; 37 res = setrlimit(RLIMIT_STACK, &rlim); 38 assert(res == 0); 39 40 execv(argv[0], argv); 41 assert(0 && "unreachable"); 42 } 43 } 44 45 int main(int argc, char **argv) { 46 LimitStackAndReexec(argc, argv); 47 48 // Map some memory just before the start of the current stack vma. 49 // When the stack grows down and crashes into it, Linux can send 50 // SIGBUS instead of SIGSEGV. See: 51 // http://lkml.iu.edu/hypermail/linux/kernel/1008.1/02299.html 52 const long pagesize = sysconf(_SC_PAGESIZE); 53 FILE *f = fopen("/proc/self/maps", "r"); 54 char a[1000]; 55 void *p = 0; 56 while (fgets(a, sizeof a, f)) { 57 if (strstr(a, "[stack]")) { 58 unsigned long addr; 59 if (sscanf(a, "%lx", &addr) == 1) 60 p = mmap((void *)(addr - 4 * pagesize), pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 61 } 62 } 63 assert(p); 64 65 recursive_func(0); 66 return 0; 67 } 68