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authorFlorian Weimer <fweimer@redhat.com>2021-11-08 18:31:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-09 10:02:48 -0800
commit0658a0961b0ace06b4cf0e1b73a4f20e349f4346 (patch)
tree22f46ff8d9524c438dbb02ae8fa4bec515e7f823 /fs/proc
parent83c1fd763b3220458652f7d656d5047292ebcde4 (diff)
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.c3
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)) {