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KMSAN: uninit-value in hfs_bnode_dump

Status: upstream: reported C repro on 2025/03/31 14:06
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+efd267470a41bc34bd98@syzkaller.appspotmail.com
First crash: 50d, last: 8d02h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [hfs?] KMSAN: uninit-value in hfs_bnode_dump 0 (2) 2025/04/14 10:16

Sample crash report:
loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in hfs_bnode_read_u8 fs/hfs/bnode.c:54 [inline]
BUG: KMSAN: uninit-value in hfs_bnode_dump+0x30e/0x4c0 fs/hfs/bnode.c:172
 hfs_bnode_read_u8 fs/hfs/bnode.c:54 [inline]
 hfs_bnode_dump+0x30e/0x4c0 fs/hfs/bnode.c:172
 hfs_brec_remove+0x868/0x9a0 fs/hfs/brec.c:225
 hfs_cat_move+0xfc9/0x12e0 fs/hfs/catalog.c:364
 hfs_rename+0x344/0x500 fs/hfs/dir.c:299
 vfs_rename+0x1d9d/0x2280 fs/namei.c:5086
 do_renameat2+0x1577/0x1b80 fs/namei.c:5235
 __do_sys_rename fs/namei.c:5282 [inline]
 __se_sys_rename fs/namei.c:5280 [inline]
 __x64_sys_rename+0xe8/0x140 fs/namei.c:5280
 x64_sys_call+0x3a1e/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable data.i created at:
 hfs_bnode_read_u16 fs/hfs/bnode.c:-1 [inline]
 hfs_bnode_dump+0x3c5/0x4c0 fs/hfs/bnode.c:156
 hfs_brec_remove+0x868/0x9a0 fs/hfs/brec.c:225

CPU: 0 UID: 0 PID: 5795 Comm: syz-executor436 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/14 12:38 upstream 8ffd015db85f 0bd6db41 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/14 10:41 upstream 8ffd015db85f 0bd6db41 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/14 10:15 upstream 8ffd015db85f 0bd6db41 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/09 04:01 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/09 04:01 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/06 06:30 upstream 02ddfb981de8 ae98e6b9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/02 22:38 upstream 02ddfb981de8 b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/02 22:38 upstream 02ddfb981de8 b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/30 21:29 upstream 02ddfb981de8 ce7952f4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/27 09:32 upstream 02ddfb981de8 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/27 09:31 upstream 02ddfb981de8 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/25 00:36 upstream e72e9e693307 9c80ffa0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/21 11:53 upstream 9d7a0577c9db 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/14 07:55 upstream 8ffd015db85f 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/03/27 13:59 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/03/27 13:58 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/06 10:04 upstream 02ddfb981de8 ae98e6b9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/03 03:11 upstream 02ddfb981de8 b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
2025/05/03 03:10 upstream 02ddfb981de8 b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/27 02:27 upstream 02ddfb981de8 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/27 02:26 upstream 02ddfb981de8 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/21 14:56 upstream 9d7a0577c9db 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
2025/04/14 17:20 upstream 8ffd015db85f 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in hfs_bnode_dump
* Struck through repros no longer work on HEAD.