[syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

[syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    610a9b8f49fb Linux 6.7-rc8
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1419f31ae80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e51fe20c3e51ba7f
dashboard link: https://syzkaller.appspot.com/bug?extid=60a66d44892b66b56545
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12551029e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12595b95e80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/28ecdd56de1e/disk-610a9b8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3c5afc17c174/vmlinux-610a9b8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/96ff79b2992d/bzImage-610a9b8f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60a66d44892b66b56545@syzkaller.appspotmail.com

=====================================================
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:494 [inline]
 dgram_sendmsg+0xd1d/0x1500 net/ieee802154/socket.c:677
 ieee802154_sock_sendmsg+0x91/0xc0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x9c2/0xd60 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+0x307/0x490 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Local variable hdr created at:
 ieee802154_header_create+0x4e/0xc00 net/mac802154/iface.c:360
 wpan_dev_hard_header include/net/cfg802154.h:494 [inline]
 dgram_sendmsg+0xd1d/0x1500 net/ieee802154/socket.c:677

CPU: 1 PID: 5009 Comm: syz-executor271 Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

[syzbot]

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.

Re: [syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+60a66d44892b66b56545@syzkaller.appspotmail.com

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=16edfe42180000
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1096c324180000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

[syzbot]

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+0x9ac/0xa30 net/ieee802154/header_ops.c:108
 ieee802154_hdr_push_sechdr net/ieee802154/header_ops.c:54 [inline]
 ieee802154_hdr_push+0x9ac/0xa30 net/ieee802154/header_ops.c:108
 ieee802154_header_create+0x812/0xb60 net/mac802154/iface.c:402
 wpan_dev_hard_header include/net/cfg802154.h:525 [inline]
 dgram_sendmsg+0xb40/0x16d0 net/ieee802154/socket.c:677
 ieee802154_sock_sendmsg+0x92/0xd0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681
 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ieee802154_hdr_push_sechdr net/ieee802154/header_ops.c:54 [inline]
 ieee802154_hdr_push+0x9a5/0xa30 net/ieee802154/header_ops.c:108
 ieee802154_header_create+0x812/0xb60 net/mac802154/iface.c:402
 wpan_dev_hard_header include/net/cfg802154.h:525 [inline]
 dgram_sendmsg+0xb40/0x16d0 net/ieee802154/socket.c:677
 ieee802154_sock_sendmsg+0x92/0xd0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681
 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable hdr created at:
 ieee802154_header_create+0x4e/0xb60 net/mac802154/iface.c:366
 wpan_dev_hard_header include/net/cfg802154.h:525 [inline]
 dgram_sendmsg+0xb40/0x16d0 net/ieee802154/socket.c:677

CPU: 1 UID: 0 PID: 6600 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================


Tested on:

commit:         4a298a43 Merge tag 'smp-urgent-2025-12-12' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118609c2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=47c3d24c6e93e95d
dashboard link: https://syzkaller.appspot.com/bug?extid=60a66d44892b66b56545
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17099e1a580000

Re: [syzbot] [wpan?] KMSAN: uninit-value in ieee802154_hdr_push (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+60a66d44892b66b56545@syzkaller.appspotmail.com
Tested-by: syzbot+60a66d44892b66b56545@syzkaller.appspotmail.com

Tested on:

commit:         4a298a43 Merge tag 'smp-urgent-2025-12-12' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14f47e1a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=47c3d24c6e93e95d
dashboard link: https://syzkaller.appspot.com/bug?extid=60a66d44892b66b56545
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=171971b4580000

Note: testing is done by a robot and is best-effort only.