linux-kernel - Re: [PATCH 1/1] gtp: fix use-after-free and null-ptr-deref in gtp_genl_dump

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Date: Wed, 24 Jan 2024 14:20:04 +0300
From: kovalev@...linux.org
To: Eric Dumazet <edumazet@...gle.com>
Cc: pablo@...filter.org, laforge@...monks.org, davem@...emloft.net,
 kuba@...nel.org, pabeni@...hat.com, osmocom-net-gprs@...ts.osmocom.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, nickel@...linux.org,
 oficerovas@...linux.org, dutyrok@...linux.org, kovalev@...linux.org
Subject: Re: [PATCH 1/1] gtp: fix use-after-free and null-ptr-deref in
 gtp_genl_dump_pdp()

24.01.2024 13:57, Eric Dumazet wrote:
> Oh wait, this is a 5.10 kernel ?
Yes, but the bug is reproduced on the latest stable kernels.
> Please generate a stack trace using a recent tree, it is possible the
> bug has been fixed already.

See [PATCH 0/1] above, there's a stack for the 6.6.13 kernel at the 
bottom of the message.

[  523.915255] Call Trace:
[  523.915255]  <TASK>
[  523.915255]  ? __die+0x1f/0x70
[  523.915255]  ? page_fault_oops+0x14d/0x4a0
[  523.915255]  ? exc_page_fault+0x7b/0x180
[  523.915255]  ? asm_exc_page_fault+0x22/0x30
[  523.915255]  ? gtp_genl_dump_pdp+0x82/0x190 [gtp]
[  523.915255]  ? gtp_genl_dump_pdp+0x82/0x190 [gtp]
[  523.915255]  genl_dumpit+0x2f/0x90
[  523.915255]  netlink_dump+0x126/0x320
[  523.915255]  __netlink_dump_start+0x1da/0x2a0
[  523.915255]  genl_family_rcv_msg_dumpit+0x93/0x100
[  523.915255]  ? __pfx_genl_start+0x10/0x10
[  523.915255]  ? __pfx_genl_dumpit+0x10/0x10
[  523.915255]  ? __pfx_genl_done+0x10/0x10
[  523.915255]  genl_rcv_msg+0x112/0x2a0
[  523.915255]  ? __pfx_gtp_genl_dump_pdp+0x10/0x10 [gtp]
[  523.915255]  ? __pfx_genl_rcv_msg+0x10/0x10
[  523.915255]  netlink_rcv_skb+0x54/0x110
[  523.915255]  genl_rcv+0x24/0x40
[  523.915255]  netlink_unicast+0x19f/0x290
[  523.915255]  netlink_sendmsg+0x250/0x4e0
[  523.915255]  ____sys_sendmsg+0x376/0x3b0
[  523.915255]  ? copy_msghdr_from_user+0x6d/0xb0
[  523.915255]  ___sys_sendmsg+0x86/0xe0
[  523.915255]  ? do_fault+0x296/0x470
[  523.915255]  ? __handle_mm_fault+0x771/0xda0
[  523.915255]  __sys_sendmsg+0x57/0xb0
[  523.915255]  do_syscall_64+0x59/0x90
[  523.915255]  ? ct_kernel_exit.isra.0+0x71/0x90
[  523.915255]  ? __ct_user_enter+0x5a/0xd0
[  523.915255]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
[  523.915255] RIP: 0033:0x7f2bcb93cd49

-- 
Regards,
Vasiliy Kovalev