linux-kernel - Re: [syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr

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Date: Tue, 13 Feb 2024 06:51:03 -0800
From: syzbot <syzbot+60a66d44892b66b56545@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, n.zhandarovich@...tech.ru, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in ieee802154_hdr_push

=====================================================
BUG: KMSAN: uninit-value in ieee802154_hdr_push_sechdr net/ieee802154/header_ops.c:54 [inline]
BUG: KMSAN: uninit-value in ieee802154_hdr_push+0x971/0xb90 net/ieee802154/header_ops.c:108
 ieee802154_hdr_push_sechdr net/ieee802154/header_ops.c:54 [inline]
 ieee802154_hdr_push+0x971/0xb90 net/ieee802154/header_ops.c:108
 ieee802154_header_create+0x9c0/0xc00 net/mac802154/iface.c:396
 wpan_dev_hard_header include/net/cfg802154.h:524 [inline]
 dgram_sendmsg+0xd1e/0x1500 net/ieee802154/socket.c:677
 ieee802154_sock_sendmsg+0x96/0xd0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x30e/0x380 net/socket.c:745
 ____sys_sendmsg+0x877/0xb60 net/socket.c:2584
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
 __sys_sendmsg net/socket.c:2667 [inline]
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x307/0x4a0 net/socket.c:2674
 do_syscall_64+0x76/0x150
 entry_SYSCALL_64_after_hwframe+0x6c/0x74

Local variable hdr created at:
 ieee802154_header_create+0x4e/0xc00 net/mac802154/iface.c:360
 wpan_dev_hard_header include/net/cfg802154.h:524 [inline]
 dgram_sendmsg+0xd1e/0x1500 net/ieee802154/socket.c:677

CPU: 0 PID: 5449 Comm: syz-executor.0 Not tainted 6.8.0-rc4-next-20240213-syzkaller-g46d4e2eb58e1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================


Tested on:

commit:         46d4e2eb Add linux-next specific files for 20240213
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1553bdec180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e558550134480d4a
dashboard link: https://syzkaller.appspot.com/bug?extid=60a66d44892b66b56545
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.