forked from OSchip/llvm-project
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
|
// RUN: %clang_scudo %s -o %t
|
||
|
|
// RUN: %run %t after 2>&1 | FileCheck %s
|
||
|
|
// RUN: %run %t before 2>&1 | FileCheck %s
|
||
|
|
|
||
|
|
// Test that we hit a guard page when writing past the end of a chunk
|
||
|
|
// allocated by the Secondary allocator, or writing too far in front of it.
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
#include <malloc.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
void handler(int signo, siginfo_t *info, void *uctx) {
|
||
|
|
if (info->si_code == SEGV_ACCERR) {
|
||
|
|
fprintf(stderr, "SCUDO SIGSEGV\n");
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
// The size must be large enough to be serviced by the secondary allocator.
|
||
|
|
long page_size = sysconf(_SC_PAGESIZE);
|
||
|
|
size_t size = (1U << 17) + page_size;
|
||
|
|
struct sigaction a;
|
||
|
|
|
||
|
|
assert(argc == 2);
|
||
|
|
memset(&a, 0, sizeof(a));
|
||
|
|
a.sa_sigaction = handler;
|
||
|
|
a.sa_flags = SA_SIGINFO;
|
||
|
|
|
||
|
|
char *p = (char *)malloc(size);
|
||
|
|
assert(p);
|
||
|
|
memset(p, 'A', size); // This should not trigger anything.
|
||
|
|
// Set up the SIGSEGV handler now, as the rest should trigger an AV.
|
||
|
|
sigaction(SIGSEGV, &a, NULL);
|
||
|
|
if (!strcmp(argv[1], "after")) {
|
||
|
|
for (int i = 0; i < page_size; i++)
|
||
|
|
p[size + i] = 'A';
|
||
|
|
}
|
||
|
|
if (!strcmp(argv[1], "before")) {
|
||
|
|
for (int i = 1; i < page_size; i++)
|
||
|
|
p[-i] = 'A';
|
||
|
|
}
|
||
|
|
free(p);
|
||
|
|
|
||
|
|
return 1; // A successful test means we shouldn't reach this.
|
||
|
|
}
|
||
|
|
|
||
|
|
// CHECK: SCUDO SIGSEGV
|