Vulnerability CVE-2024-27009
Published: 2024-05-01

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

s390/cio: fix race condition during online processing

A race condition exists in ccw_device_set_online() that can cause the
online process to fail, leaving the affected device in an inconsistent
state. As a result, subsequent attempts to set that device online fail
with return code ENODEV.

The problem occurs when a path verification request arrives after
a wait for final device state completed, but before the result state
is evaluated.

Fix this by ensuring that the CCW-device lock is held between
determining final state and checking result state.

Note that since:

commit 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")

path verification requests are much more likely to occur during boot,
resulting in an increased chance of this race condition occurring.

 References:
https://git.kernel.org/stable/c/3076b3c38a704e10df5e143c213653309d532538
https://git.kernel.org/stable/c/559f3a6333397ab6cd4a696edd65a70b6be62c6e
https://git.kernel.org/stable/c/2df56f4ea769ff81e51bbb05699989603bde9c49
https://git.kernel.org/stable/c/a4234decd0fe429832ca81c4637be7248b88b49e
https://git.kernel.org/stable/c/2d8527f2f911fab84aec04df4788c0c23af3df48
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