linux-cve-announce - CVE-2024-56639: net: hsr: must allocate more bytes for RedBox support

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Message-ID: <2024122736-CVE-2024-56639-809a@gregkh>
Date: Fri, 27 Dec 2024 16:02:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56639: net: hsr: must allocate more bytes for RedBox support

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

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

net: hsr: must allocate more bytes for RedBox support

Blamed commit forgot to change hsr_init_skb() to allocate
larger skb for RedBox case.

Indeed, send_hsr_supervision_frame() will add
two additional components (struct hsr_sup_tlv
and struct hsr_sup_payload)

syzbot reported the following crash:
skbuff: skb_over_panic: text:ffffffff8afd4b0a len:34 put:6 head:ffff88802ad29e00 data:ffff88802ad29f22 tail:0x144 end:0x140 dev:gretap0
------------[ cut here ]------------
 kernel BUG at net/core/skbuff.c:206 !
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 2 UID: 0 PID: 7611 Comm: syz-executor Not tainted 6.12.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
 RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:206
Code: b6 04 01 84 c0 74 04 3c 03 7e 21 8b 4b 70 41 56 45 89 e8 48 c7 c7 a0 7d 9b 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 9a 76 79 f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 94 76 fb f8 4c
RSP: 0018:ffffc90000858ab8 EFLAGS: 00010282
RAX: 0000000000000087 RBX: ffff8880598c08c0 RCX: ffffffff816d3e69
RDX: 0000000000000000 RSI: ffffffff816de786 RDI: 0000000000000005
RBP: ffffffff8c9b91c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000302 R11: ffffffff961cc1d0 R12: ffffffff8afd4b0a
R13: 0000000000000006 R14: ffff88804b938130 R15: 0000000000000140
FS:  000055558a3d6500(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1295974ff8 CR3: 000000002ab6e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
  skb_over_panic net/core/skbuff.c:211 [inline]
  skb_put+0x174/0x1b0 net/core/skbuff.c:2617
  send_hsr_supervision_frame+0x6fa/0x9e0 net/hsr/hsr_device.c:342
  hsr_proxy_announce+0x1a3/0x4a0 net/hsr/hsr_device.c:436
  call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1794
  expire_timers kernel/time/timer.c:1845 [inline]
  __run_timers+0x6e8/0x930 kernel/time/timer.c:2419
  __run_timer_base kernel/time/timer.c:2430 [inline]
  __run_timer_base kernel/time/timer.c:2423 [inline]
  run_timer_base+0x111/0x190 kernel/time/timer.c:2439
  run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2449
  handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
  __do_softirq kernel/softirq.c:588 [inline]
  invoke_softirq kernel/softirq.c:428 [inline]
  __irq_exit_rcu kernel/softirq.c:637 [inline]
  irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
  sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>

The Linux kernel CVE team has assigned CVE-2024-56639 to this issue.


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

	Issue introduced in 6.10 with commit 5055cccfc2d1cc1a7306f6bcdcd0ee9521d707f5 and fixed in 6.12.5 with commit 688842f47ee9fb392d1c3a1ced1d21d505b14968
	Issue introduced in 6.10 with commit 5055cccfc2d1cc1a7306f6bcdcd0ee9521d707f5 and fixed in 6.13-rc2 with commit af8edaeddbc52e53207d859c912b017fd9a77629

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-2024-56639
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/hsr/hsr_device.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/688842f47ee9fb392d1c3a1ced1d21d505b14968
	https://git.kernel.org/stable/c/af8edaeddbc52e53207d859c912b017fd9a77629