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 #include <assert.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <unistd.h> 10 #include <sys/mman.h> 11 #include <sys/resource.h> 12 13 const int BS = 1024; 14 volatile char x; 15 volatile int y = 1; 16 17 void recursive_func(char *p) { 18 char buf[BS]; 19 buf[rand() % BS] = 1; 20 buf[rand() % BS] = 2; 21 x = buf[rand() % BS]; 22 if (y) 23 recursive_func(buf); 24 x = 1; // prevent tail call optimization 25 // CHECK: {{stack-overflow on address 0x.* \(pc 0x.* bp 0x.* sp 0x.* T.*\)}} 26 } 27 28 void LimitStackAndReexec(int argc, char **argv) { 29 struct rlimit rlim; 30 int res = getrlimit(RLIMIT_STACK, &rlim); 31 assert(res == 0); 32 if (rlim.rlim_cur == RLIM_INFINITY) { 33 rlim.rlim_cur = 256 * 1024; 34 res = setrlimit(RLIMIT_STACK, &rlim); 35 assert(res == 0); 36 37 execv(argv[0], argv); 38 assert(0 && "unreachable"); 39 } 40 } 41 42 int main(int argc, char **argv) { 43 LimitStackAndReexec(argc, argv); 44 45 // Map some memory just before the start of the current stack vma. 46 // When the stack grows down and crashes into it, Linux can send 47 // SIGBUS instead of SIGSEGV. See: 48 // http://lkml.iu.edu/hypermail/linux/kernel/1008.1/02299.html 49 const long pagesize = sysconf(_SC_PAGESIZE); 50 FILE *f = fopen("/proc/self/maps", "r"); 51 char a[1000]; 52 void *p = 0; 53 while (fgets(a, sizeof a, f)) { 54 if (strstr(a, "[stack]")) { 55 unsigned long addr; 56 if (sscanf(a, "%lx", &addr) == 1) 57 p = mmap((void *)(addr - 4 * pagesize), pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 58 } 59 } 60 assert(p); 61 62 recursive_func(0); 63 return 0; 64 } 65
