This is a note to let you know that I've just added the patch titled
aio: restore locking of ioctx list on removal
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
aio-restore-locking-of-ioctx-list-on-removal.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From mguzik@xxxxxxxxxx Fri Dec 6 09:24:03 2013
From: Mateusz Guzik <mguzik@xxxxxxxxxx>
Date: Thu, 5 Dec 2013 11:09:02 +0100
Subject: aio: restore locking of ioctx list on removal
To: stable@xxxxxxxxxxxxxxx
Cc: Eryu Guan <eguan@xxxxxxxxxx>, Jeff Moyer <jmoyer@xxxxxxxxxx>, Kent Overstreet <kmo@xxxxxxxxxxxxx>, linux-aio@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Message-ID: <1386238142-21792-1-git-send-email-mguzik@xxxxxxxxxx>
From: Mateusz Guzik <mguzik@xxxxxxxxxx>
Commit 36f5588905c10a8c4568a210d601fe8c3c27e0f0
"aio: refcounting cleanup" resulted in ioctx_lock not being held
during ctx removal, leaving the list susceptible to corruptions.
In mainline kernel the issue went away as a side effect of
db446a08c23d5475e6b08c87acca79ebb20f283c "aio: convert the ioctx list to
table lookup v3".
Fix the problem by restoring appropriate locking.
Signed-off-by: Mateusz Guzik <mguzik@xxxxxxxxxx>
Reported-by: Eryu Guan <eguan@xxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Acked-by: Benjamin LaHaise <bcrl@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/aio.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -423,10 +423,12 @@ static void kill_ioctx_rcu(struct rcu_he
* when the processes owning a context have all exited to encourage
* the rapid destruction of the kioctx.
*/
-static void kill_ioctx(struct kioctx *ctx)
+static void kill_ioctx(struct mm_struct *mm, struct kioctx *ctx)
{
if (!atomic_xchg(&ctx->dead, 1)) {
+ spin_lock(&mm->ioctx_lock);
hlist_del_rcu(&ctx->list);
+ spin_unlock(&mm->ioctx_lock);
/*
* It'd be more correct to do this in free_ioctx(), after all
@@ -494,7 +496,7 @@ void exit_aio(struct mm_struct *mm)
*/
ctx->mmap_size = 0;
- kill_ioctx(ctx);
+ kill_ioctx(mm, ctx);
}
}
@@ -852,7 +854,7 @@ SYSCALL_DEFINE2(io_setup, unsigned, nr_e
if (!IS_ERR(ioctx)) {
ret = put_user(ioctx->user_id, ctxp);
if (ret)
- kill_ioctx(ioctx);
+ kill_ioctx(current->mm, ioctx);
put_ioctx(ioctx);
}
@@ -870,7 +872,7 @@ SYSCALL_DEFINE1(io_destroy, aio_context_
{
struct kioctx *ioctx = lookup_ioctx(ctx);
if (likely(NULL != ioctx)) {
- kill_ioctx(ioctx);
+ kill_ioctx(current->mm, ioctx);
put_ioctx(ioctx);
return 0;
}
Patches currently in stable-queue which might be from mguzik@xxxxxxxxxx are
queue-3.10/aio-restore-locking-of-ioctx-list-on-removal.patch
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