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Oliver Neukum 78e892874c USB: chaoskey: fail open after removal [ Upstream commit `422dc0a4d1` ] chaoskey_open() takes the lock only to increase the counter of openings. That means that the mutual exclusion with chaoskey_disconnect() cannot prevent an increase of the counter and chaoskey_open() returning a success. If that race is hit, chaoskey_disconnect() will happily free all resources associated with the device after it has dropped the lock, as it has read the counter as zero. To prevent this race chaoskey_open() has to check the presence of the device under the lock. However, the current per device lock cannot be used, because it is a part of the data structure to be freed. Hence an additional global mutex is needed. The issue is as old as the driver. Signed-off-by: Oliver Neukum <oneukum@suse.com> Reported-by: syzbot+422188bce66e76020e55@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=422188bce66e76020e55 Fixes: `66e3e59189` ("usb: Add driver for Altus Metrum ChaosKey device (v2)") Rule: add Link: https://lore.kernel.org/stable/20241002132201.552578-1-oneukum%40suse.com Link: https://lore.kernel.org/r/20241002132201.552578-1-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-12-14 19:53:53 +01:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.