diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2020-08-13 22:29:19 +0900 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2020-08-13 15:56:42 +0200 |
| commit | 598f4936eb24a3835f35dfbf7840f0c7065634a8 (patch) | |
| tree | 6d9931222646872b13816db579f251f9d46e6a2b | |
| parent | 60d836d3726332d1a13cf2e62806471ccbdb5e50 (diff) | |
executor/linux: dump more information when failed to open kcov file
With commit 50e21c6be6188f42 ("executor/linux: dump mount information when
failed to open kcov file"), we got an unexpected result.
/sys/kernel/ does not exist despite /sys/ exists.
/proc/mounts cannot be opened despite /proc/ exists.
If sysfs is not mounted on /sys/ and proc is not mounted on /proc/ ,
maybe other filesystems (e.g. devtmpfs, cgroup) are not mounted as well.
Let's dump "/", "/proc/" and "/sys/", and then mount /proc/ and dump /proc/mounts .
| -rw-r--r-- | executor/executor_linux.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/executor/executor_linux.h b/executor/executor_linux.h index e8105f65f..fce380561 100644 --- a/executor/executor_linux.h +++ b/executor/executor_linux.h @@ -91,11 +91,28 @@ static intptr_t execute_syscall(const call_t* c, intptr_t a[kMaxArgs]) return res; } +static void dump_dir(const char* path) +{ + DIR* dir = opendir(path); + struct dirent* d = NULL; + if (!dir) + return; + fprintf(stderr, "Index of %s\n", path); + while ((d = readdir(dir)) != NULL) + fprintf(stderr, " %s\n", d->d_name); + closedir(dir); +} + static void cover_open(cover_t* cov, bool extra) { int fd = open("/sys/kernel/debug/kcov", O_RDWR); if (fd == -1) { const int err = errno; + dump_dir("/"); + dump_dir("/proc/"); + dump_dir("/sys/"); + if (mount("/proc/", "/proc/", "proc", 0, NULL)) + fprintf(stderr, "Can't mount proc on /proc/\n"); if (chdir("/sys/")) fprintf(stderr, "/sys/ does not exist.\n"); else if (chdir("/sys/kernel/")) |