]> git.baikalelectronics.ru Git - kernel.git/commit
[PATCH] namespaces: fix exit race by splitting exit
authorSerge E. Hallyn <serue@us.ibm.com>
Mon, 29 Jan 2007 21:19:40 +0000 (13:19 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 30 Jan 2007 16:26:44 +0000 (08:26 -0800)
commit97b3ae0569873d94bede4e084c914267a11f7872
treead556f0ec00637df5b4c4a2063c6b3325666d2f1
parente5f30c35f9f2dcf587254db58e7f8a38b4b262fb
[PATCH] namespaces: fix exit race by splitting exit

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>
include/linux/nsproxy.h
kernel/exit.c
kernel/fork.c
kernel/nsproxy.c