linux-cve-announce - CVE-2021-47170: USB: usbfs: Don't WARN about excessively large memory allocations

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Date: Mon, 25 Mar 2024 10:16:46 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2021-47170: USB: usbfs: Don't WARN about excessively large memory allocations

Description
===========

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

USB: usbfs: Don't WARN about excessively large memory allocations

Syzbot found that the kernel generates a WARNing if the user tries to
submit a bulk transfer through usbfs with a buffer that is way too
large.  This isn't a bug in the kernel; it's merely an invalid request
from the user and the usbfs code does handle it correctly.

In theory the same thing can happen with async transfers, or with the
packet descriptor table for isochronous transfers.

To prevent the MM subsystem from complaining about these bad
allocation requests, add the __GFP_NOWARN flag to the kmalloc calls
for these buffers.

The Linux kernel CVE team has assigned CVE-2021-47170 to this issue.


Affected and fixed versions
===========================

	Fixed in 4.19.193 with commit 2ab21d6e1411
	Fixed in 5.4.124 with commit 2c835fede13e
	Fixed in 5.10.42 with commit 8d83f109e920
	Fixed in 5.12.9 with commit 9f7cb3f01a10
	Fixed in 5.13 with commit 4f2629ea67e7

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2021-47170
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/usb/core/devio.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002eb
	https://git.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83
	https://git.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2ed
	https://git.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098
	https://git.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de