syzbot


KMSAN: uninit-value in hsr_get_node (3)

Status: upstream: reported C repro on 2024/04/18 04:08
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+a81f2759d022496b40ab@syzkaller.appspotmail.com
First crash: 37d, last: 6d12h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] KMSAN: uninit-value in hsr_get_node (3) 3 (7) 2024/04/19 16:45
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in copyout (2) net C 6723 348d 1517d 22/26 fixed on 2023/06/08 14:41
upstream KMSAN: uninit-value in hsr_get_node net 304 1138d 1380d 0/26 auto-closed as invalid on 2021/07/08 06:23
upstream KMSAN: kernel-infoleak in _copy_to_iter (7) net C 138977 452d 804d 22/26 fixed on 2023/02/24 13:50
upstream KMSAN: uninit-value in hsr_get_node (2) net C 49 42d 128d 26/26 fixed on 2024/04/10 03:59
upstream KMSAN: uninit-value in IP6_ECN_decapsulate net C 981 154d 2069d 25/26 fixed on 2023/12/21 03:45
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/04/19 15:51 28m aha310510@gmail.com patch upstream OK log
2024/04/19 13:03 27m aha310510@gmail.com patch upstream OK log
2024/04/18 08:40 1h31m aha310510@gmail.com upstream report log

Sample crash report:
syz_tun: entered promiscuous mode
batadv_slave_0: entered promiscuous mode
=====================================================
BUG: KMSAN: uninit-value in hsr_get_node+0xab0/0xad0 net/hsr/hsr_framereg.c:250
 hsr_get_node+0xab0/0xad0 net/hsr/hsr_framereg.c:250
 fill_frame_info net/hsr/hsr_forward.c:577 [inline]
 hsr_forward_skb+0x330/0x30e0 net/hsr/hsr_forward.c:615
 hsr_handle_frame+0xa20/0xb50 net/hsr/hsr_slave.c:69
 __netif_receive_skb_core+0x1cff/0x6190 net/core/dev.c:5432
 __netif_receive_skb_one_core net/core/dev.c:5536 [inline]
 __netif_receive_skb+0xca/0xa00 net/core/dev.c:5652
 netif_receive_skb_internal net/core/dev.c:5738 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5798
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549
 tun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002
 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb63/0x1520 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264
 alloc_pages+0x1bf/0x1e0 mm/mempolicy.c:2335
 skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:2921
 tun_build_skb drivers/net/tun.c:1679 [inline]
 tun_get_user+0x1258/0x69e0 drivers/net/tun.c:1819
 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb63/0x1520 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 PID: 5050 Comm: syz-executor387 Not tainted 6.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/16 06:48 upstream 0bbac3facb5d 0d592ce4 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hsr_get_node
2024/05/12 11:20 upstream cf87f46fd34d 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hsr_get_node
2024/04/29 08:43 upstream e67572cd2204 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hsr_get_node
2024/04/24 03:21 upstream 71b1543c83d6 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hsr_get_node
2024/04/15 20:10 upstream 0bbac3facb5d 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hsr_get_node
2024/04/14 04:03 upstream fa4022cb7361 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hsr_get_node
2024/05/15 07:43 upstream 101b7a97143a fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hsr_get_node
2024/05/12 12:31 upstream cf87f46fd34d 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hsr_get_node
* Struck through repros no longer work on HEAD.