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fs-util: check for /proc mounted in access_fd()

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It's a very basic function very similar to other cases where we go via
/proc/self/fd/, hence do the explicit proc_mounted() check here too.
This commit is contained in:
Lennart Poettering 2020-09-23 18:19:21 +02:00
parent 48d837cd92
commit 4265a66a5e
1 changed files with 14 additions and 5 deletions
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19
src/basic/fs-util.c
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@ -1298,16 +1298,25 @@ int chase_symlinks_and_stat(
int access_fd(int fd, int mode) {
char p[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
int r;
/* Like access() but operates on an already open fd */
xsprintf(p, "/proc/self/fd/%i", fd);
r = access(p, mode);
if (r < 0)
return -errno;
if (access(p, mode) < 0) {
if (errno != ENOENT)
return -errno;
return r;
/* ENOENT can mean two things: that the fd does not exist or that /proc is not mounted. Let's
* make things debuggable and distinguish the two. */
if (proc_mounted() == 0)
return -ENOSYS; /* /proc is not available or not set up properly, we're most likely in some chroot
* environment. */
return -EBADF; /* The directory exists, hence it's the fd that doesn't. */
}
return 0;
}
void unlink_tempfilep(char (*p)[]) {