linux-cve-announce - CVE-2023-54145: bpf: drop unnecessary user-triggerable WARN

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Message-ID: <2025122424-CVE-2023-54145-421d@gregkh>
Date: Wed, 24 Dec 2025 14:07:42 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54145: bpf: drop unnecessary user-triggerable WARN_ONCE in verifierl log

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

bpf: drop unnecessary user-triggerable WARN_ONCE in verifierl log

It's trivial for user to trigger "verifier log line truncated" warning,
as verifier has a fixed-sized buffer of 1024 bytes (as of now), and there are at
least two pieces of user-provided information that can be output through
this buffer, and both can be arbitrarily sized by user:
  - BTF names;
  - BTF.ext source code lines strings.

Verifier log buffer should be properly sized for typical verifier state
output. But it's sort-of expected that this buffer won't be long enough
in some circumstances. So let's drop the check. In any case code will
work correctly, at worst truncating a part of a single line output.

The Linux kernel CVE team has assigned CVE-2023-54145 to this issue.


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

	Fixed in 6.1.107 with commit 40c88c429a598006f91ad7a2b89856cd50b3a008
	Fixed in 6.4.7 with commit 926a175026fed5d534f587ea4ec3ec49265cd3c5
	Fixed in 6.5 with commit cff36398bd4c7d322d424433db437f3c3391c491

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-2023-54145
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:
	kernel/bpf/log.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/40c88c429a598006f91ad7a2b89856cd50b3a008
	https://git.kernel.org/stable/c/926a175026fed5d534f587ea4ec3ec49265cd3c5
	https://git.kernel.org/stable/c/cff36398bd4c7d322d424433db437f3c3391c491