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[PATCH] namespaces: fix exit race by splitting exit

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Fix exit race by splitting the nsproxy putting into two pieces.  First
piece reduces the nsproxy refcount.  If we dropped the last reference, then
it puts the mnt_ns, and returns the nsproxy as a hint to the caller.  Else
it returns NULL.  The second piece of exiting task namespaces sets
tsk->nsproxy to NULL, and drops the references to other namespaces and
frees the nsproxy only if an nsproxy was passed in.

A little awkward and should probably be reworked, but hopefully it fixes
the NFS oops.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Daniel Hokka Zakrisson <daniel@hozac.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Serge E. Hallyn
2007-01-29 13:19:40 -08:00
committed by Linus Torvalds
parent c0d4d573fe
commit 7a238fcba0
4 changed files with 40 additions and 16 deletions
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4
kernel/fork.c
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@@ -1265,7 +1265,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
return p;
bad_fork_cleanup_namespaces:
exit_task_namespaces(p);
put_and_finalize_nsproxy(p->nsproxy);
bad_fork_cleanup_keys:
exit_keys(p);
bad_fork_cleanup_mm:
@@ -1711,7 +1711,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
}
if (new_nsproxy)
put_nsproxy(new_nsproxy);
put_and_finalize_nsproxy(new_nsproxy);
bad_unshare_cleanup_ipc:
if (new_ipc)