This is a note to let you know that I've just added the patch titled
s390/dasd: protect device queue against concurrent access
to the 5.4-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:
s390-dasd-protect-device-queue-against-concurrent-access.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From db46cd1e0426f52999d50fa72cfa97fa39952885 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20H=C3=B6ppner?= <hoeppner@xxxxxxxxxxxxx>
Date: Wed, 25 Oct 2023 15:24:37 +0200
Subject: s390/dasd: protect device queue against concurrent access
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From: Jan Höppner <hoeppner@xxxxxxxxxxxxx>
commit db46cd1e0426f52999d50fa72cfa97fa39952885 upstream.
In dasd_profile_start() the amount of requests on the device queue are
counted. The access to the device queue is unprotected against
concurrent access. With a lot of parallel I/O, especially with alias
devices enabled, the device queue can change while dasd_profile_start()
is accessing the queue. In the worst case this leads to a kernel panic
due to incorrect pointer accesses.
Fix this by taking the device lock before accessing the queue and
counting the requests. Additionally the check for a valid profile data
pointer can be done earlier to avoid unnecessary locking in a hot path.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 4fa52aa7a82f ("[S390] dasd: add enhanced DASD statistics interface")
Reviewed-by: Stefan Haberland <sth@xxxxxxxxxxxxx>
Signed-off-by: Jan Höppner <hoeppner@xxxxxxxxxxxxx>
Signed-off-by: Stefan Haberland <sth@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231025132437.1223363-3-sth@xxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/block/dasd.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -737,18 +737,20 @@ static void dasd_profile_start(struct da
* we count each request only once.
*/
device = cqr->startdev;
- if (device->profile.data) {
- counter = 1; /* request is not yet queued on the start device */
- list_for_each(l, &device->ccw_queue)
- if (++counter >= 31)
- break;
- }
+ if (!device->profile.data)
+ return;
+
+ spin_lock(get_ccwdev_lock(device->cdev));
+ counter = 1; /* request is not yet queued on the start device */
+ list_for_each(l, &device->ccw_queue)
+ if (++counter >= 31)
+ break;
+ spin_unlock(get_ccwdev_lock(device->cdev));
+
spin_lock(&device->profile.lock);
- if (device->profile.data) {
- device->profile.data->dasd_io_nr_req[counter]++;
- if (rq_data_dir(req) == READ)
- device->profile.data->dasd_read_nr_req[counter]++;
- }
+ device->profile.data->dasd_io_nr_req[counter]++;
+ if (rq_data_dir(req) == READ)
+ device->profile.data->dasd_read_nr_req[counter]++;
spin_unlock(&device->profile.lock);
}
Patches currently in stable-queue which might be from hoeppner@xxxxxxxxxxxxx are
queue-5.4/s390-dasd-protect-device-queue-against-concurrent-access.patch
