The patch titled
Subject: procfs: do not list TID 0 in /proc/<pid>/task
has been added to the -mm tree. Its filename is
procfs-do-not-list-tid-0-in-proc-pid-task.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/procfs-do-not-list-tid-0-in-proc-pid-task.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/procfs-do-not-list-tid-0-in-proc-pid-task.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Florian Weimer <fweimer@xxxxxxxxxx>
Subject: procfs: do not list TID 0 in /proc/<pid>/task
If a task exits concurrently, task_pid_nr_ns may return 0.
Link: https://lkml.kernel.org/r/8735pn5dx7.fsf@xxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/base.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/proc/base.c~procfs-do-not-list-tid-0-in-proc-pid-task
+++ a/fs/proc/base.c
@@ -3800,6 +3800,9 @@ static int proc_task_readdir(struct file
char name[10 + 1];
unsigned int len;
tid = task_pid_nr_ns(task, ns);
+ if (!tid)
+ /* The task has just exited. */
+ continue;
len = snprintf(name, sizeof(name), "%u", tid);
if (!proc_fill_cache(file, ctx, name, len,
proc_task_instantiate, task, NULL)) {
_
Patches currently in -mm which might be from fweimer@xxxxxxxxxx are
procfs-do-not-list-tid-0-in-proc-pid-task.patch
