KMSAN: uninit-value in reiserfs_new

KMSAN: uninit-value in reiserfs_new_inode
Status: upstream: reported on 2021/02/01 09:07
Reported-by: syzbot+2a318f14e5e6bb69b96b@syzkaller.appspotmail.com
First crash: 28d, last: 21d

Sample crash report:
REISERFS (device loop2): Using r5 hash to sort names
REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage.
=====================================================
BUG: KMSAN: uninit-value in reiserfs_new_inode+0x207c/0x3c30 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/inode.c:2058
CPU: 0 PID: 11141 Comm: syz-executor.2 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack syzkaller/managers/upstream-kmsan-gce-386/kernel/lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 syzkaller/managers/upstream-kmsan-gce-386/kernel/lib/dump_stack.c:118
 kmsan_report+0xfb/0x1e0 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan_instr.c:197
 reiserfs_new_inode+0x207c/0x3c30 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/inode.c:2058
 reiserfs_create+0x89b/0xf00 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/namei.c:667
 xattr_create syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:69 [inline]
 xattr_lookup+0x495/0x6a0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:412
 reiserfs_xattr_set_handle+0x1eb/0x2ab0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:540
 reiserfs_xattr_set+0x84d/0x9f0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:640
 security_set+0x1b5/0x210 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr_security.c:31
 __vfs_setxattr+0x90e/0x960 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:177
 __vfs_setxattr_noperm+0x376/0xc70 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:208
 __vfs_setxattr_locked+0x5ed/0x690 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:266
 vfs_setxattr+0x1e4/0x4d0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:283
 setxattr+0x446/0x900 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:548
 path_setxattr+0x2cd/0x4e0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:567
 __do_sys_lsetxattr syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:589 [inline]
 __se_sys_lsetxattr+0xeb/0x110 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:585
 __ia32_sys_lsetxattr+0x62/0x80 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/xattr.c:585
 do_syscall_32_irqs_on syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x102/0x160 syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fec549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f55e65fc EFLAGS: 00000296 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 0000000020000080
RDX: 00000000200000c0 RSI: 0000000000000018 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan.c:121
 kmsan_alloc_page+0xd3/0x1f0 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/kmsan/kmsan_shadow.c:274
 __alloc_pages_nodemask+0x827/0xf90 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/page_alloc.c:4989
 alloc_pages_current+0x7b6/0xb60 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/mempolicy.c:2271
 alloc_pages syzkaller/managers/upstream-kmsan-gce-386/kernel/./include/linux/gfp.h:547 [inline]
 alloc_slab_page syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:1630 [inline]
 allocate_slab+0x346/0x11a0 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:1773
 new_slab syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:1834 [inline]
 new_slab_objects syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2593 [inline]
 ___slab_alloc+0xd42/0x1930 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2756
 __slab_alloc syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2796 [inline]
 slab_alloc_node syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2871 [inline]
 slab_alloc syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2915 [inline]
 kmem_cache_alloc+0xb71/0x1040 syzkaller/managers/upstream-kmsan-gce-386/kernel/mm/slub.c:2920
 reiserfs_alloc_inode+0x5a/0x170 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/super.c:642
 alloc_inode syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/inode.c:234 [inline]
 new_inode_pseudo+0xa7/0x580 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/inode.c:930
 new_inode+0x5a/0x3d0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/inode.c:959
 reiserfs_mkdir+0x2c2/0x1440 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/namei.c:811
 xattr_mkdir syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:76 [inline]
 create_privroot syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:889 [inline]
 reiserfs_xattr_init+0x4d3/0xea0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/xattr.c:1011
 reiserfs_fill_super+0x5c01/0x6010 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/super.c:2177
 mount_bdev+0x618/0x900 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/super.c:1419
 get_super_block+0xc9/0xe0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/reiserfs/super.c:2606
 legacy_get_tree+0x163/0x2e0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/fs_context.c:592
 vfs_get_tree+0xd8/0x5e0 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/super.c:1549
 do_new_mount syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/namespace.c:2875 [inline]
 path_mount+0x3df0/0x5e50 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/namespace.c:3205
 do_mount syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/namespace.c:3218 [inline]
 __do_sys_mount syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/namespace.c:3426 [inline]
 __se_sys_mount+0x921/0xa10 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/namespace.c:3403
 __ia32_sys_mount+0x62/0x80 syzkaller/managers/upstream-kmsan-gce-386/kernel/fs/namespace.c:3403
 do_syscall_32_irqs_on syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x102/0x160 syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 syzkaller/managers/upstream-kmsan-gce-386/kernel/arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
=====================================================
Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kmsan-gce-386	2021/02/07 06:24	https://github.com/google/kmsan.git master	73d62e81	0655e081	.config	log	report			info	KMSAN: uninit-value in reiserfs_new_inode
ci-upstream-kmsan-gce-386	2021/01/31 22:12	https://github.com/google/kmsan.git master	73d62e81	fc9fd31e	.config	log	report			info	KMSAN: uninit-value in reiserfs_new_inode