3.11.10.2 -stable review patch. If anyone has any objections, please let me know.
------------------
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>
Cc: linux-aio@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Acked-by: Benjamin LaHaise <bcrl@xxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/aio.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index 9b5ca11..975a5d5 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -425,10 +425,12 @@ static void kill_ioctx_rcu(struct rcu_head *head)
* 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
@@ -496,7 +498,7 @@ void exit_aio(struct mm_struct *mm)
*/
ctx->mmap_size = 0;
- kill_ioctx(ctx);
+ kill_ioctx(mm, ctx);
}
}
@@ -854,7 +856,7 @@ SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
if (!IS_ERR(ioctx)) {
ret = put_user(ioctx->user_id, ctxp);
if (ret)
- kill_ioctx(ioctx);
+ kill_ioctx(current->mm, ioctx);
put_ioctx(ioctx);
}
@@ -872,7 +874,7 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
{
struct kioctx *ioctx = lookup_ioctx(ctx);
if (likely(NULL != ioctx)) {
- kill_ioctx(ioctx);
+ kill_ioctx(current->mm, ioctx);
put_ioctx(ioctx);
return 0;
}
--
1.8.3.2
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