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proc: instantiate only pids that we can ptrace on 'hidepid=4' mount option

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If "hidepid=4" mount option is set then do not instantiate pids that
we can not ptrace. "hidepid=4" means that procfs should only contain
pids that the caller can ptrace.

Signed-off-by: Djalal Harouni <tixxdz@gmail.com>
Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Alexey Gladkov
2020-04-19 16:10:53 +02:00
committed by Eric W. Biederman
parent fa10fed30f
commit 24a71ce5c4
3 changed files with 26 additions and 3 deletions
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include/linux/proc_fs.h
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@@ -47,6 +47,7 @@ enum {
HIDEPID_OFF = 0,
HIDEPID_NO_ACCESS = 1,
HIDEPID_INVISIBLE = 2,
HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
};
struct proc_fs_info {