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asan: fix a test 

Page size is not necessary 4096.
Use sysconf to obtain page size.

llvm-svn: 242651
This commit is contained in:
Dmitry Vyukov 2015-07-19 21:44:49 +00:00
parent 9c25418424
commit 2e2ac45655
1 changed files with 7 additions and 4 deletions
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11
compiler-rt/test/sanitizer_common/TestCases/Linux/signal_segv_handler.cc
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@ -18,24 +18,27 @@
#include <signal.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
unsigned long page_size;
void *guard;
void handler(int signo, siginfo_t *info, void *uctx) {
mprotect(guard, 4096, PROT_READ | PROT_WRITE);
mprotect(guard, page_size, PROT_READ | PROT_WRITE);
}
int main() {
page_size = sysconf(_SC_PAGESIZE);
struct sigaction a, old;
memset(&a, 0, sizeof(a));
memset(&old, 0, sizeof(old));
a.sa_sigaction = handler;
a.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV, &a, &old);
guard = (char *)mmap(0, 3 * 4096, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0) +
4096;
guard = mmap(0, 3 * page_size, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
guard = (char*)guard + page_size; // work around a kernel bug
for (int i = 0; i < 1000000; i++) {
mprotect(guard, 4096, PROT_NONE);
mprotect(guard, page_size, PROT_NONE);
*(int*)guard = 1;
}
sigaction(SIGSEGV, &old, 0);