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userns: limit the maximum depth of user_namespace->parent chain

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Ensure that user_namespace->parent chain can't grow too much.
Currently we use the hardroded 32 as limit.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2013-08-08 18:55:32 +02:00 • committed by Linus Torvalds
parent 55f5bfd4c9
commit 8742f229b6
2 changed files with 5 additions and 0 deletions
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include/linux/user_namespace.h
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@ -23,6 +23,7 @@ struct user_namespace {
struct uid_gid_map projid_map;
atomic_t count;
struct user_namespace *parent;
int level;
kuid_t owner;
kgid_t group;
unsigned int proc_inum;