Vulnerability CVE-2024-26775
Published: 2024-04-03

Description:
In the Linux kernel, the following vulnerability has been resolved:

aoe: avoid potential deadlock at set_capacity

Move set_capacity() outside of the section procected by (&d->lock).
To avoid possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
[1] lock(&bdev->bd_size_lock);
local_irq_disable();
[2] lock(&d->lock);
[3] lock(&bdev->bd_size_lock);
<Interrupt>
[4] lock(&d->lock);

*** DEADLOCK ***

Where [1](&bdev->bd_size_lock) hold by zram_add()->set_capacity().
[2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc()
is trying to acquire [3](&bdev->bd_size_lock) at set_capacity() call.
In this situation an attempt to acquire [4]lock(&d->lock) from
aoecmd_cfg_rsp() will lead to deadlock.

So the simplest solution is breaking lock dependency
[2](&d->lock) -> [3](&bdev->bd_size_lock) by moving set_capacity()
outside.

 References:
https://git.kernel.org/stable/c/2d623c94fbba3554f4446ba6f3c764994e8b0d26
https://git.kernel.org/stable/c/673629018ba04906899dcb631beec34d871f709c
https://git.kernel.org/stable/c/19a77b27163820f793b4d022979ffdca8f659b77
https://git.kernel.org/stable/c/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86
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