This is a note to let you know that I've just added the patch titled
block: partition: initialize percpuref before sending out KOBJ_ADD
to the 4.4-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:
block-partition-initialize-percpuref-before-sending-out-kobj_add.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b30a337ca27c4f40439e4bfb290cba5f88d73bb7 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Date: Wed, 30 Mar 2016 08:46:31 +0800
Subject: block: partition: initialize percpuref before sending out KOBJ_ADD
From: Ming Lei <ming.lei@xxxxxxxxxxxxx>
commit b30a337ca27c4f40439e4bfb290cba5f88d73bb7 upstream.
The initialization of partition's percpu_ref should have been done before
sending out KOBJ_ADD uevent, which may cause userspace to read partition
table. So the uninitialized percpu_ref may be accessed in data path.
This patch fixes this issue reported by Naveen.
Reported-by: Naveen Kaje <nkaje@xxxxxxxxxxxxxx>
Tested-by: Naveen Kaje <nkaje@xxxxxxxxxxxxxx>
Fixes: 6c71013ecb7e2(block: partition: convert percpu ref)
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/partition-generic.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -349,15 +349,20 @@ struct hd_struct *add_partition(struct g
goto out_del;
}
+ err = hd_ref_init(p);
+ if (err) {
+ if (flags & ADDPART_FLAG_WHOLEDISK)
+ goto out_remove_file;
+ goto out_del;
+ }
+
/* everything is up and running, commence */
rcu_assign_pointer(ptbl->part[partno], p);
/* suppress uevent if the disk suppresses it */
if (!dev_get_uevent_suppress(ddev))
kobject_uevent(&pdev->kobj, KOBJ_ADD);
-
- if (!hd_ref_init(p))
- return p;
+ return p;
out_free_info:
free_part_info(p);
@@ -366,6 +371,8 @@ out_free_stats:
out_free:
kfree(p);
return ERR_PTR(err);
+out_remove_file:
+ device_remove_file(pdev, &dev_attr_whole_disk);
out_del:
kobject_put(p->holder_dir);
device_del(pdev);
Patches currently in stable-queue which might be from ming.lei@xxxxxxxxxxxxx are
queue-4.4/block-partition-initialize-percpuref-before-sending-out-kobj_add.patch
queue-4.4/block-loop-fix-filesystem-corruption-in-case-of-aio-dio.patch
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