Message-ID: <673046ce.050a0220.320e73.031d.GAE@google.com>
Date: Sat, 09 Nov 2024 21:38:22 -0800
From: syzbot <syzbot+6b97c7810fd3600a03e0@...kaller.appspotmail.com>
To: almaz.alexandrovich@...agon-software.com, linux-kernel@...r.kernel.org, 
	ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_read_hdr

Hello,

syzbot found the following issue on:

HEAD commit:    da4373fbcf00 Merge tag 'thermal-6.12-rc7' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16c5e0c0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e4580d62ee1893a5
dashboard link: https://syzkaller.appspot.com/bug?extid=6b97c7810fd3600a03e0
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/204d5ed3c12b/disk-da4373fb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b51aa0c6ab3a/vmlinux-da4373fb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/197213720e0c/bzImage-da4373fb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6b97c7810fd3600a03e0@...kaller.appspotmail.com

ntfs3(loop4): Different NTFS sector size (2048) and media sector size (512).
=====================================================
BUG: KMSAN: uninit-value in ntfs_dir_emit fs/ntfs3/dir.c:333 [inline]
BUG: KMSAN: uninit-value in ntfs_read_hdr+0xfba/0x1290 fs/ntfs3/dir.c:383
 ntfs_dir_emit fs/ntfs3/dir.c:333 [inline]
 ntfs_read_hdr+0xfba/0x1290 fs/ntfs3/dir.c:383
 ntfs_readdir+0xf48/0x1a10 fs/ntfs3/dir.c:494
 iterate_dir+0x5b3/0x9e0 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x16e/0x550 fs/readdir.c:392
 __x64_sys_getdents64+0x96/0xe0 fs/readdir.c:392
 x64_sys_call+0x3430/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:218
 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

Uninit was stored to memory at:
 ntfs_read_run_nb+0x786/0x1070 fs/ntfs3/fsntfs.c:1252
 ntfs_read_bh+0x64/0xde0 fs/ntfs3/fsntfs.c:1313
 indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
 ntfs_readdir+0xe07/0x1a10 fs/ntfs3/dir.c:489
 iterate_dir+0x5b3/0x9e0 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x16e/0x550 fs/readdir.c:392
 __x64_sys_getdents64+0x96/0xe0 fs/readdir.c:392
 x64_sys_call+0x3430/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:218
 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

Uninit was stored to memory at:
 ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
 indx_write fs/ntfs3/index.c:1027 [inline]
 indx_insert_into_buffer+0xd8f/0x2010 fs/ntfs3/index.c:1811
 indx_insert_entry+0xa3c/0xee0 fs/ntfs3/index.c:1988
 ni_add_name+0xe5d/0x10d0 fs/ntfs3/frecord.c:3120
 ntfs_link_inode+0x265/0x310 fs/ntfs3/inode.c:1735
 ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
 vfs_link+0x94c/0xb70 fs/namei.c:4739
 do_linkat+0x4f5/0xfd0 fs/namei.c:4809
 __do_sys_linkat fs/namei.c:4837 [inline]
 __se_sys_linkat fs/namei.c:4834 [inline]
 __x64_sys_linkat+0x186/0x230 fs/namei.c:4834
 x64_sys_call+0x37e1/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:266
 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

Uninit was stored to memory at:
 hdr_insert_de fs/ntfs3/index.c:838 [inline]
 indx_insert_into_buffer+0xcdf/0x2010 fs/ntfs3/index.c:1807
 indx_insert_entry+0xa3c/0xee0 fs/ntfs3/index.c:1988
 ni_add_name+0xe5d/0x10d0 fs/ntfs3/frecord.c:3120
 ntfs_link_inode+0x265/0x310 fs/ntfs3/inode.c:1735
 ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
 vfs_link+0x94c/0xb70 fs/namei.c:4739
 do_linkat+0x4f5/0xfd0 fs/namei.c:4809
 __do_sys_linkat fs/namei.c:4837 [inline]
 __se_sys_linkat fs/namei.c:4834 [inline]
 __x64_sys_linkat+0x186/0x230 fs/namei.c:4834
 x64_sys_call+0x37e1/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:266
 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

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4091 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 kmem_cache_alloc_noprof+0x637/0xb20 mm/slub.c:4141
 ntfs_link_inode+0x8f/0x310 fs/ntfs3/inode.c:1723
 ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
 vfs_link+0x94c/0xb70 fs/namei.c:4739
 do_linkat+0x4f5/0xfd0 fs/namei.c:4809
 __do_sys_linkat fs/namei.c:4837 [inline]
 __se_sys_linkat fs/namei.c:4834 [inline]
 __x64_sys_linkat+0x186/0x230 fs/namei.c:4834
 x64_sys_call+0x37e1/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:266
 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

CPU: 0 UID: 0 PID: 10448 Comm: syz.4.1589 Not tainted 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
=====================================================


---
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