Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 369 by [email protected]: asan should handle SIGBUS on Linux
https://code.google.com/p/address-sanitizer/issues/detail?id=369
On Linux, some stack overflows generate SIGBUS instead of SIGSEGV. Asan
should handle SIGBUS so that it can report these stack overflows properly.
Here's a test case:
$ cat bus.c
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
void foo()
{
foo();
}
int main()
{
const long pagesize = sysconf(_SC_PAGESIZE);
FILE *f = fopen("/proc/self/maps", "r");
char a[1000];
while (fgets(a, sizeof a, f))
{
if (strstr(a, "[stack]"))
{
unsigned long addr;
if (sscanf(a, "%lx", &addr) == 1)
mmap((void *)(addr - 4 * pagesize), pagesize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
}
}
foo();
return 0;
}
$ clang -o bus bus.c -fsanitize=address && ulimit -Ss 8192 && ./bus
Bus error (core dumped)
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