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Date: Fri, 18 May 2012 03:33:02 +0100 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Mike Galbraith <efault@....de>, Oleg Nesterov <oleg@...hat.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Pavel Emelyanov <xemul@...allels.com>, Cyrill Gorcunov <gorcunov@...nvz.org>, Louis Rilling <louis.rilling@...labs.com> Subject: [ 08/53] namespaces, pid_ns: fix leakage on fork() failure 3.2.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mike Galbraith <efault@....de> commit 5e2bf0142231194d36fdc9596b36a261ed2b9fe7 upstream. Fork() failure post namespace creation for a child cloned with CLONE_NEWPID leaks pid_namespace/mnt_cache due to proc being mounted during creation, but not unmounted during cleanup. Call pid_ns_release_proc() during cleanup. Signed-off-by: Mike Galbraith <efault@....de> Acked-by: Oleg Nesterov <oleg@...hat.com> Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Pavel Emelyanov <xemul@...allels.com> Cc: Cyrill Gorcunov <gorcunov@...nvz.org> Cc: Louis Rilling <louis.rilling@...labs.com> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- kernel/fork.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/fork.c b/kernel/fork.c index b9372a0..687a15d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -47,6 +47,7 @@ #include <linux/audit.h> #include <linux/memcontrol.h> #include <linux/ftrace.h> +#include <linux/proc_fs.h> #include <linux/profile.h> #include <linux/rmap.h> #include <linux/ksm.h> @@ -1464,6 +1465,8 @@ bad_fork_cleanup_io: if (p->io_context) exit_io_context(p); bad_fork_cleanup_namespaces: + if (unlikely(clone_flags & CLONE_NEWPID)) + pid_ns_release_proc(p->nsproxy->pid_ns); exit_task_namespaces(p); bad_fork_cleanup_mm: if (p->mm) -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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