CVE-2024-56639

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>