diff options
| author | Cyrill Gorcunov <[email protected]> | 2012-10-19 13:56:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2012-10-19 14:07:47 -0700 |
| commit | bbc2e3ef87851bc5430b2b4cf4ca3a2f29baeda6 (patch) | |
| tree | d9cef396c8370184f23e99480725aa8fde4bea08 /include/linux | |
| parent | dc36d7e7cd422d69b15e7ec7cc1f021f581a6b6d (diff) | |
pidns: remove recursion from free_pid_ns()
free_pid_ns() operates in a recursive fashion:
free_pid_ns(parent)
put_pid_ns(parent)
kref_put(&ns->kref, free_pid_ns);
free_pid_ns
thus if there was a huge nesting of namespaces the userspace may trigger
avalanche calling of free_pid_ns leading to kernel stack exhausting and a
panic eventually.
This patch turns the recursion into an iterative loop.
Based on a patch by Andrew Vagin.
[[email protected]: export put_pid_ns() to modules]
Signed-off-by: Cyrill Gorcunov <[email protected]>
Cc: Andrew Vagin <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pid_namespace.h | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index 00474b047145..65e3e87eacc5 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -47,15 +47,9 @@ static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) } extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns); -extern void free_pid_ns(struct kref *kref); extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); - -static inline void put_pid_ns(struct pid_namespace *ns) -{ - if (ns != &init_pid_ns) - kref_put(&ns->kref, free_pid_ns); -} +extern void put_pid_ns(struct pid_namespace *ns); #else /* !CONFIG_PID_NS */ #include <linux/err.h> |