KMSAN: uninit-value in hfs_read

KMSAN: uninit-value in hfs_read_inode

Status: upstream: reported C repro on 2024/11/22 04:48
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+2db3c7526ba68f4ea776@syzkaller.appspotmail.com
Fix commit: b905bafdea21 hfs: Sanity check the root record
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 130d, last: 115d

▶ ▼ Discussions (9)

Title	Replies (including bot)	Last reply
[PATCH AUTOSEL 5.4 1/4] mac802154: check local interfaces before deleting sdata list	2 (2)	2025/01/13 18:36
[PATCH AUTOSEL 5.10 1/5] mac802154: check local interfaces before deleting sdata list	2 (2)	2025/01/13 18:36
[PATCH AUTOSEL 5.15 1/6] mac802154: check local interfaces before deleting sdata list	2 (2)	2025/01/13 18:35
[PATCH AUTOSEL 6.1 01/10] mac802154: check local interfaces before deleting sdata list	2 (2)	2025/01/13 18:35
[PATCH AUTOSEL 6.6 01/10] mac802154: check local interfaces before deleting sdata list	2 (2)	2025/01/13 18:35
[PATCH AUTOSEL 6.12 01/20] mac802154: check local interfaces before deleting sdata list	3 (3)	2025/01/13 18:34
[PATCH v2] hfs: Sanity check the root record	3 (3)	2024/12/02 14:32
[PATCH] hfs: Sanity check the root record	5 (5)	2024/12/01 04:27
[syzbot] [hfs?] KMSAN: uninit-value in hfs_read_inode	1 (3)	2024/11/22 22:52

▶ ▼ Last patch testing requests (2)


Created	Duration	User	Patch	Repo	Result
2024/12/02 18:35	28m	retest repro		upstream	report log
2024/11/22 22:21	29m	leocstone@gmail.com	patch	upstream	OK log

Sample crash report:

loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in hfs_inode_read_fork fs/hfs/inode.c:287 [inline]
BUG: KMSAN: uninit-value in hfs_read_inode+0x10ae/0x1690 fs/hfs/inode.c:343
 hfs_inode_read_fork fs/hfs/inode.c:287 [inline]
 hfs_read_inode+0x10ae/0x1690 fs/hfs/inode.c:343
 inode_insert5+0x1dd/0x970 fs/inode.c:1281
 iget5_locked+0xfe/0x1d0 fs/inode.c:1338
 hfs_iget+0x121/0x240 fs/hfs/inode.c:403
 hfs_fill_super+0x2098/0x23c0 fs/hfs/super.c:431
 mount_bdev+0x39a/0x520 fs/super.c:1693
 hfs_mount+0x4d/0x60 fs/hfs/super.c:457
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507
 path_mount+0x742/0x1f10 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:4034
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034
 x64_sys_call+0x255a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable rec created at:
 hfs_fill_super+0x67/0x23c0 fs/hfs/super.c:383
 mount_bdev+0x39a/0x520 fs/super.c:1693

CPU: 1 UID: 0 PID: 5790 Comm: syz-executor415 Not tainted 6.12.0-rc7-syzkaller-00216-gf66d6acccbc0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
=====================================================

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2024/11/18 07:13	upstream	f66d6acccbc0	cfe3a04a	.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_read_inode
2024/11/18 04:41	upstream	f66d6acccbc0	cfe3a04a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kmsan-gce-root	KMSAN: uninit-value in hfs_read_inode

* ~~Struck through~~ repros no longer work on HEAD.