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area_is_valid with write

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This commit is contained in:
Andrea Fioraldi
2021-03-01 17:16:34 +01:00
parent 75d6a8b701
commit a29b360d55
1 changed files with 11 additions and 3 deletions
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14
instrumentation/afl-compiler-rt.o.c
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@ -123,6 +123,10 @@ static u8 is_persistent;
static u8 _is_sancov; static u8 _is_sancov;
/* Dummy pipe for area_is_valid() */
static int dummy_pipe;
/* ensure we kill the child on termination */ /* ensure we kill the child on termination */
void at_exit(int signal) { void at_exit(int signal) {
@ -476,6 +480,11 @@ static void __afl_map_shm(void) {
} }
if (id_str) { if (id_str) {
if (pipe(dummy_pipe) < 0) {
perror("pipe() failed\n");
exit(1);
}
#ifdef USEMMAP #ifdef USEMMAP
const char * shm_file_path = id_str; const char * shm_file_path = id_str;
@ -1567,9 +1576,8 @@ static int area_is_valid(void *ptr, size_t len) {
char *p = (char *)ptr; char *p = (char *)ptr;
char *page = (char *)((uintptr_t)p & ~(sysconf(_SC_PAGE_SIZE) - 1)); char *page = (char *)((uintptr_t)p & ~(sysconf(_SC_PAGE_SIZE) - 1));
int r = syscall(SYS_msync, page, (p - page) + len, MS_ASYNC); int r = syscall(dummy_pipe[1], SYS_write, page, (p - page) + len);
if (r < 0) return errno != ENOMEM; return errno != EFAULT;
return 1;
} }