linux-cve-announce - CVE-2022-49877: bpf, sockmap: Fix the sk->sk_forward_alloc warning of sk_stream_kill

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Message-ID: <2025050153-CVE-2022-49877-1f59@gregkh>
Date: Thu,  1 May 2025 16:11:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49877: bpf, sockmap: Fix the sk->sk_forward_alloc warning of sk_stream_kill_queues

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

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

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

bpf, sockmap: Fix the sk->sk_forward_alloc warning of sk_stream_kill_queues

When running `test_sockmap` selftests, the following warning appears:

  WARNING: CPU: 2 PID: 197 at net/core/stream.c:205 sk_stream_kill_queues+0xd3/0xf0
  Call Trace:
  <TASK>
  inet_csk_destroy_sock+0x55/0x110
  tcp_rcv_state_process+0xd28/0x1380
  ? tcp_v4_do_rcv+0x77/0x2c0
  tcp_v4_do_rcv+0x77/0x2c0
  __release_sock+0x106/0x130
  __tcp_close+0x1a7/0x4e0
  tcp_close+0x20/0x70
  inet_release+0x3c/0x80
  __sock_release+0x3a/0xb0
  sock_close+0x14/0x20
  __fput+0xa3/0x260
  task_work_run+0x59/0xb0
  exit_to_user_mode_prepare+0x1b3/0x1c0
  syscall_exit_to_user_mode+0x19/0x50
  do_syscall_64+0x48/0x90
  entry_SYSCALL_64_after_hwframe+0x44/0xae

The root case is in commit 84472b436e76 ("bpf, sockmap: Fix more uncharged
while msg has more_data"), where I used msg->sg.size to replace the tosend,
causing breakage:

  if (msg->apply_bytes && msg->apply_bytes < tosend)
    tosend = psock->apply_bytes;

The Linux kernel CVE team has assigned CVE-2022-49877 to this issue.


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

	Issue introduced in 5.4.189 with commit 244ce90c8d0bd10ebf957da02c6f3fcd5d920bdf and fixed in 5.4.225 with commit d975bec1eaeb52341acc9273db79ddb078220399
	Issue introduced in 5.10.110 with commit 7b812a369e6416ab06d83cdd39d8e3f752781dd0 and fixed in 5.10.155 with commit cc21dc48a78cc9e5af9a4d039cd456446a6e73ff
	Issue introduced in 5.15.33 with commit 168ff181f5b6e7fce684c98a30d35da1dbf8f82a and fixed in 5.15.79 with commit 95adbd2ac8de82e43fd6b347e7e1b47f74dc1abb
	Issue introduced in 5.18 with commit 84472b436e760ba439e1969a9e3c5ae7c86de39d and fixed in 6.0.9 with commit 14e8bc3bf7bd6af64d7538a0684c8238d96cdfd7
	Issue introduced in 5.18 with commit 84472b436e760ba439e1969a9e3c5ae7c86de39d and fixed in 6.1 with commit 8ec95b94716a1e4d126edc3fb2bc426a717e2dba
	Issue introduced in 5.16.19 with commit 87d532d41ef937e16f61b3d2094f3a2ac49be365
	Issue introduced in 5.17.2 with commit abb4caa477a5450817d2aa1198edce66450aecf8

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-2022-49877
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:
	net/ipv4/tcp_bpf.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/d975bec1eaeb52341acc9273db79ddb078220399
	https://git.kernel.org/stable/c/cc21dc48a78cc9e5af9a4d039cd456446a6e73ff
	https://git.kernel.org/stable/c/95adbd2ac8de82e43fd6b347e7e1b47f74dc1abb
	https://git.kernel.org/stable/c/14e8bc3bf7bd6af64d7538a0684c8238d96cdfd7
	https://git.kernel.org/stable/c/8ec95b94716a1e4d126edc3fb2bc426a717e2dba