diff options
| author | Dmitry Vyukov <dvyukov@google.com> | 2018-08-08 12:48:06 +0200 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2018-08-08 12:48:06 +0200 |
| commit | 9a791c399266a650acac45ac55a066a84aad7c64 (patch) | |
| tree | 681c84b68c945f14cc64087bd19c6d04ee2f25cb /executor/executor_linux.h | |
| parent | ddeb9f8d8828ea4f297656445164e17a9f4c2591 (diff) | |
executor: remap cover fd's to higher values
Remap cover fd's to 24x range to prevent interference
with fd's used during fuzzing and also to make
fd number consistent with/without cover enabled.
Diffstat (limited to 'executor/executor_linux.h')
| -rw-r--r-- | executor/executor_linux.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/executor/executor_linux.h b/executor/executor_linux.h index 1cdb2dc46..2eab98560 100644 --- a/executor/executor_linux.h +++ b/executor/executor_linux.h @@ -40,9 +40,12 @@ static long execute_syscall(const call_t* c, long a[kMaxArgs]) static void cover_open(cover_t* cov) { - cov->fd = open("/sys/kernel/debug/kcov", O_RDWR); - if (cov->fd == -1) + int fd = open("/sys/kernel/debug/kcov", O_RDWR); + if (fd == -1) fail("open of /sys/kernel/debug/kcov failed"); + if (dup2(fd, cov->fd) < 0) + fail("filed to dup2(%d, %d) cover fd", fd, cov->fd); + close(fd); const int kcov_init_trace = is_kernel_64_bit ? KCOV_INIT_TRACE64 : KCOV_INIT_TRACE32; if (ioctl(cov->fd, kcov_init_trace, kCoverSize)) fail("cover init trace write failed"); |