[syzbot] KMSAN: uninit-value in hfs_revalidate_dentry

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a472f15b3d1e kmsan: allow using __msan_instrument_asm_stor..
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1206a7fd880000
kernel config: https://syzkaller.appspot.com/x/.config?x=1429f86b132e6d40
dashboard link: https://syzkaller.appspot.com/bug?extid=3ae6be33a50b5aae4dab
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a8bf743ab4c3/disk-a472f15b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7248eae68bc7/vmlinux-a472f15b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0e33e55592a5/bzImage-a472f15b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3ae6be...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in hfs_revalidate_dentry+0x17f/0x3e0 fs/hfs/sysdep.c:30
hfs_revalidate_dentry+0x17f/0x3e0 fs/hfs/sysdep.c:30
d_revalidate fs/namei.c:856 [inline]
lookup_open fs/namei.c:3345 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x115a/0x5600 fs/namei.c:3710
do_filp_open+0x249/0x660 fs/namei.c:3740
do_sys_openat2+0x1f0/0x910 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_compat_sys_openat fs/open.c:1386 [inline]
__se_compat_sys_openat fs/open.c:1384 [inline]
__ia32_compat_sys_openat+0x2a7/0x330 fs/open.c:1384
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
__alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578
alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285
alloc_slab_page mm/slub.c:1794 [inline]
allocate_slab+0x1b5/0x1010 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429
alloc_inode_sb include/linux/fs.h:3117 [inline]
hfs_alloc_inode+0x56/0xc0 fs/hfs/super.c:165
alloc_inode+0x83/0x440 fs/inode.c:259
iget_locked+0x2a1/0xe20 fs/inode.c:1286
hfs_btree_open+0x162/0x1ab0 fs/hfs/btree.c:38
hfs_mdb_get+0x207d/0x29b0 fs/hfs/mdb.c:199
hfs_fill_super+0x1d13/0x2400 fs/hfs/super.c:406
mount_bdev+0x508/0x840 fs/super.c:1401
hfs_mount+0x49/0x60 fs/hfs/super.c:456
legacy_get_tree+0x10c/0x280 fs/fs_context.c:610
vfs_get_tree+0xa1/0x500 fs/super.c:1531
do_new_mount+0x694/0x1580 fs/namespace.c:3040
path_mount+0x71a/0x1eb0 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x734/0x840 fs/namespace.c:3568
__ia32_sys_mount+0xdf/0x140 fs/namespace.c:3568
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 0 PID: 4234 Comm: syz-executor.0 Not tainted 6.1.0-rc6-syzkaller-63555-ga472f15b3d1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
=====================================================


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 8c89ecf5c13b kmsan: silence -Wmissing-prototypes warnings

git tree: https://github.com/google/kmsan.git master

console output: https://syzkaller.appspot.com/x/log.txt?x=10b53fff480000
kernel config: https://syzkaller.appspot.com/x/.config?x=91d3152219aa6b45
dashboard link: https://syzkaller.appspot.com/bug?extid=3ae6be33a50b5aae4dab
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1409f0b3480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c76993480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fa537cffb53c/disk-8c89ecf5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5b9d03c04a3e/vmlinux-8c89ecf5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/55c166dec3af/bzImage-8c89ecf5.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/b234e4e5c704/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3ae6be...@syzkaller.appspotmail.com

=======================================================
WARNING: The mand mount option has been deprecated and
and is ignored by this kernel. Remove the mand
option from the mount to silence this warning.
=======================================================
=====================================================
BUG: KMSAN: uninit-value in hfs_ext_read_extent fs/hfs/extent.c:196 [inline]
BUG: KMSAN: uninit-value in hfs_get_block+0x92d/0x1620 fs/hfs/extent.c:366
hfs_ext_read_extent fs/hfs/extent.c:196 [inline]
hfs_get_block+0x92d/0x1620 fs/hfs/extent.c:366
block_read_full_folio+0x4ff/0x11b0 fs/buffer.c:2271
hfs_read_folio+0x55/0x60 fs/hfs/inode.c:39
filemap_read_folio+0x148/0x4f0 mm/filemap.c:2426
do_read_cache_folio+0x7c8/0xd90 mm/filemap.c:3553
do_read_cache_page mm/filemap.c:3595 [inline]
read_cache_page+0xfb/0x2f0 mm/filemap.c:3604
read_mapping_page include/linux/pagemap.h:755 [inline]
hfs_btree_open+0x928/0x1ae0 fs/hfs/btree.c:78
hfs_mdb_get+0x260c/0x3000 fs/hfs/mdb.c:204
hfs_fill_super+0x1fb1/0x2790 fs/hfs/super.c:406
mount_bdev+0x628/0x920 fs/super.c:1359
hfs_mount+0xcd/0xe0 fs/hfs/super.c:456
legacy_get_tree+0x167/0x2e0 fs/fs_context.c:610
vfs_get_tree+0xdc/0x5d0 fs/super.c:1489
do_new_mount+0x7a9/0x16f0 fs/namespace.c:3145
path_mount+0xf98/0x26a0 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount+0x919/0x9e0 fs/namespace.c:3674
__ia32_sys_mount+0x15b/0x1b0 fs/namespace.c:3674

do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178

do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246

entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:

__alloc_pages+0x926/0x10a0 mm/page_alloc.c:5572
alloc_pages+0xb4b/0xec0
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab mm/slub.c:1998 [inline]
new_slab+0x5c5/0x19b0 mm/slub.c:2051
___slab_alloc+0x132b/0x3790 mm/slub.c:3193
__slab_alloc mm/slub.c:3292 [inline]
__slab_alloc_node mm/slub.c:3345 [inline]
slab_alloc_node mm/slub.c:3442 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc_lru+0x72f/0xb80 mm/slub.c:3483
alloc_inode_sb include/linux/fs.h:3119 [inline]
hfs_alloc_inode+0x80/0xf0 fs/hfs/super.c:165
alloc_inode+0xad/0x4b0 fs/inode.c:259
iget_locked+0x340/0xf80 fs/inode.c:1286
hfs_btree_open+0x20d/0x1ae0 fs/hfs/btree.c:38
hfs_mdb_get+0x2519/0x3000 fs/hfs/mdb.c:199
hfs_fill_super+0x1fb1/0x2790 fs/hfs/super.c:406
mount_bdev+0x628/0x920 fs/super.c:1359
hfs_mount+0xcd/0xe0 fs/hfs/super.c:456
legacy_get_tree+0x167/0x2e0 fs/fs_context.c:610
vfs_get_tree+0xdc/0x5d0 fs/super.c:1489
do_new_mount+0x7a9/0x16f0 fs/namespace.c:3145
path_mount+0xf98/0x26a0 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount+0x919/0x9e0 fs/namespace.c:3674
__ia32_sys_mount+0x15b/0x1b0 fs/namespace.c:3674

do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178

do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 5015 Comm: syz-executor119 Not tainted 6.2.0-rc7-syzkaller-80760-g8c89ecf5c13b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
=====================================================