diff options
| author | Florian Weimer <fweimer@redhat.com> | 2021-11-08 18:31:30 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-09 10:02:48 -0800 |
| commit | 0658a0961b0ace06b4cf0e1b73a4f20e349f4346 (patch) | |
| tree | 22f46ff8d9524c438dbb02ae8fa4bec515e7f823 /fs/proc | |
| parent | 83c1fd763b3220458652f7d656d5047292ebcde4 (diff) | |
| download | lwn-0658a0961b0ace06b4cf0e1b73a4f20e349f4346.tar.gz lwn-0658a0961b0ace06b4cf0e1b73a4f20e349f4346.zip | |
procfs: do not list TID 0 in /proc/<pid>/task
If a task exits concurrently, task_pid_nr_ns may return 0.
[akpm@linux-foundation.org: coding style tweaks]
[adobriyan@gmail.com: test that /proc/*/task doesn't contain "0"]
Link: https://lkml.kernel.org/r/YV88AnVzHxPafQ9o@localhost.localdomain
Link: https://lkml.kernel.org/r/8735pn5dx7.fsf@oldenburg.str.redhat.com
Signed-off-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/base.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 533d5836eb9a..5541de99809c 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -3799,7 +3799,10 @@ static int proc_task_readdir(struct file *file, struct dir_context *ctx) task = next_tid(task), ctx->pos++) { char name[10 + 1]; unsigned int len; + tid = task_pid_nr_ns(task, ns); + if (!tid) + continue; /* The task has just exited. */ len = snprintf(name, sizeof(name), "%u", tid); if (!proc_fill_cache(file, ctx, name, len, proc_task_instantiate, task, NULL)) { |