The patch titled
Subject: zram: refuse to use zero sized block device as backing device
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
zram-refuse-to-use-zero-sized-block-device-as-backing-device.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-refuse-to-use-zero-sized-block-device-as-backing-device.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kairui Song <kasong@xxxxxxxxxxx>
Subject: zram: refuse to use zero sized block device as backing device
Date: Tue, 10 Dec 2024 00:57:15 +0800
Patch series "zram: fix backing device setup issue", v2.
This series fixes two bugs of backing device setting:
- ZRAM should reject using a zero sized (or the uninitialized ZRAM
device itself) as the backing device.
- Fix backing device leaking when removing a uninitialized ZRAM
device.
This patch (of 2):
Setting a zero sized block device as backing device is pointless, and one
can easily create a recursive loop by setting the uninitialized ZRAM
device itself as its own backing device by (zram0 is uninitialized):
echo /dev/zram0 > /sys/block/zram0/backing_dev
It's definitely a wrong config, and the module will pin itself, kernel
should refuse doing so in the first place.
By refusing to use zero sized device we avoided misuse cases including
this one above.
Link: https://lkml.kernel.org/r/20241209165717.94215-1-ryncsn@xxxxxxxxx
Link: https://lkml.kernel.org/r/20241209165717.94215-2-ryncsn@xxxxxxxxx
Fixes: 013bf95a83ec ("zram: add interface to specif backing device")
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
Reported-by: Desheng Wu <deshengwu@xxxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/block/zram/zram_drv.c~zram-refuse-to-use-zero-sized-block-device-as-backing-device
+++ a/drivers/block/zram/zram_drv.c
@@ -614,6 +614,12 @@ static ssize_t backing_dev_store(struct
}
nr_pages = i_size_read(inode) >> PAGE_SHIFT;
+ /* Refuse to use zero sized device (also prevents self reference) */
+ if (!nr_pages) {
+ err = -EINVAL;
+ goto out;
+ }
+
bitmap_sz = BITS_TO_LONGS(nr_pages) * sizeof(long);
bitmap = kvzalloc(bitmap_sz, GFP_KERNEL);
if (!bitmap) {
_
Patches currently in -mm which might be from kasong@xxxxxxxxxxx are
zram-refuse-to-use-zero-sized-block-device-as-backing-device.patch
zram-fix-uninitialized-zram-not-releasing-backing-device.patch
