syzbot


KASAN: slab-out-of-bounds Read in fuse_inode_eq

Status: auto-closed as invalid on 2021/12/28 07:13
Reported-by: syzbot+253c77522241e1826d72@syzkaller.appspotmail.com
First crash: 459d, last: 427d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in fuse_inode_eq (2) 3 43d 84d 0/24 upstream: reported on 2022/09/07 09:11
android-5-10 KASAN: slab-out-of-bounds Read in fuse_inode_eq 5 278d 286d 0/2 auto-closed as invalid on 2022/05/26 03:34

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in get_node_id fs/fuse/fuse_i.h:864 [inline]
BUG: KASAN: slab-out-of-bounds in fuse_inode_eq+0x75/0x80 fs/fuse/inode.c:300
Read of size 8 at addr ffff8880385ca1a0 by task syz-executor.0/947

CPU: 0 PID: 947 Comm: syz-executor.0 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 get_node_id fs/fuse/fuse_i.h:864 [inline]
 fuse_inode_eq+0x75/0x80 fs/fuse/inode.c:300
 find_inode+0xe4/0x220 fs/inode.c:835
 ilookup5_nowait fs/inode.c:1345 [inline]
 ilookup5 fs/inode.c:1374 [inline]
 iget5_locked+0xbd/0x2e0 fs/inode.c:1155
 fuse_iget+0x1cc/0x6b0 fs/fuse/inode.c:341
 fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:394
 fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:424
 fuse_lookup fs/fuse/dir.c:420 [inline]
 fuse_atomic_open+0x2db/0x440 fs/fuse/dir.c:577
 atomic_open fs/namei.c:3144 [inline]
 lookup_open.isra.0+0xa25/0x13d0 fs/namei.c:3253
 open_last_lookups fs/namei.c:3352 [inline]
 path_openat+0x9a5/0x2740 fs/namei.c:3558
 do_filp_open+0x1aa/0x400 fs/namei.c:3588
 do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_openat fs/open.c:1232 [inline]
 __se_sys_openat fs/open.c:1227 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f0b34b02709
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0b32058188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0b34c07020 RCX: 00007f0b34b02709
RDX: 0000000000000000 RSI: 00000000200020c0 RDI: ffffffffffffff9c
RBP: 00007f0b34b5ccb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffd6fb3d2f R14: 00007f0b32058300 R15: 0000000000022000

Allocated by task 1374:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x83/0xb0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x142/0x390 mm/slub.c:3219
 nilfs_alloc_inode+0x19/0xe0 fs/nilfs2/super.c:154
 alloc_inode+0x61/0x230 fs/inode.c:237
 iget5_locked fs/inode.c:1158 [inline]
 iget5_locked+0x1e7/0x2e0 fs/inode.c:1151
 nilfs_iget_locked+0x9c/0xd0 fs/nilfs2/inode.c:570
 nilfs_ifile_read+0x2c/0x1a0 fs/nilfs2/ifile.c:187
 nilfs_attach_checkpoint+0x258/0x4b0 fs/nilfs2/super.c:540
 nilfs_fill_super fs/nilfs2/super.c:1063 [inline]
 nilfs_mount+0xb12/0xfb0 fs/nilfs2/super.c:1316
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount fs/namespace.c:3516 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:2987 [inline]
 call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067
 destroy_inode+0x129/0x1b0 fs/inode.c:292
 iput_final fs/inode.c:1664 [inline]
 iput.part.0+0x539/0x850 fs/inode.c:1690
 iput+0x58/0x70 fs/inode.c:1680
 nilfs_put_root+0xa9/0xd0 fs/nilfs2/the_nilfs.c:802
 nilfs_segctor_destroy fs/nilfs2/segment.c:2744 [inline]
 nilfs_detach_log_writer+0x57b/0x9f0 fs/nilfs2/segment.c:2807
 nilfs_put_super+0x3f/0x1a0 fs/nilfs2/super.c:467
 generic_shutdown_super+0x14c/0x370 fs/super.c:465
 kill_block_super+0x97/0xf0 fs/super.c:1395
 deactivate_locked_super+0x94/0x160 fs/super.c:335
 deactivate_super+0xad/0xd0 fs/super.c:366
 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1137
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:2987 [inline]
 call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067
 destroy_inode+0x129/0x1b0 fs/inode.c:292
 iput_final fs/inode.c:1664 [inline]
 iput.part.0+0x539/0x850 fs/inode.c:1690
 iput+0x58/0x70 fs/inode.c:1680
 nilfs_put_super+0x108/0x1a0 fs/nilfs2/super.c:477
 generic_shutdown_super+0x14c/0x370 fs/super.c:465
 kill_block_super+0x97/0xf0 fs/super.c:1395
 deactivate_locked_super+0x94/0x160 fs/super.c:335
 deactivate_super+0xad/0xd0 fs/super.c:366
 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1137
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff8880385c9998
 which belongs to the cache nilfs2_inode_cache of size 2056
The buggy address is located 0 bytes to the right of
 2056-byte region [ffff8880385c9998, ffff8880385ca1a0)
The buggy address belongs to the page:
page:ffffea0000e17200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880385ca220 pfn:0x385c8
head:ffffea0000e17200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000fb6c00 0000000500000005 ffff8881443ac3c0
raw: ffff8880385ca220 00000000800f000a 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 27643, ts 828871828391, free_ts 813513340859
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2197
 alloc_slab_page mm/slub.c:1763 [inline]
 allocate_slab mm/slub.c:1900 [inline]
 new_slab+0x319/0x490 mm/slub.c:1963
 ___slab_alloc+0x921/0xfe0 mm/slub.c:2994
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3081
 slab_alloc_node mm/slub.c:3172 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x365/0x390 mm/slub.c:3219
 nilfs_alloc_inode+0x19/0xe0 fs/nilfs2/super.c:154
 alloc_inode+0x61/0x230 fs/inode.c:237
 iget5_locked fs/inode.c:1158 [inline]
 iget5_locked+0x1e7/0x2e0 fs/inode.c:1151
 nilfs_iget_locked+0x9c/0xd0 fs/nilfs2/inode.c:570
 nilfs_dat_read+0x80/0x2c0 fs/nilfs2/dat.c:483
 nilfs_load_super_root fs/nilfs2/the_nilfs.c:120 [inline]
 load_nilfs+0x327/0x11d0 fs/nilfs2/the_nilfs.c:269
 nilfs_fill_super fs/nilfs2/super.c:1058 [inline]
 nilfs_mount+0xa9a/0xfb0 fs/nilfs2/super.c:1316
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3394
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x209/0x390 mm/slub.c:3219
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 lsm_file_alloc security/security.c:572 [inline]
 security_file_alloc+0x34/0x170 security/security.c:1515
 __alloc_file+0xd8/0x280 fs/file_table.c:106
 alloc_empty_file+0x6d/0x170 fs/file_table.c:150
 path_openat+0xe4/0x2740 fs/namei.c:3547
 do_filp_open+0x1aa/0x400 fs/namei.c:3588
 do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_open fs/open.c:1224 [inline]
 __se_sys_open fs/open.c:1220 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1220
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff8880385ca080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880385ca100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880385ca180: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8880385ca200: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880385ca280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2021/09/29 07:12 upstream a4e6f95a891a d82cb927 .config log report info KASAN: slab-out-of-bounds Read in fuse_inode_eq
ci-upstream-kasan-gce-smack-root 2021/08/27 22:22 upstream 77dd11439b86 d5a29e53 .config log report info KASAN: slab-out-of-bounds Read in fuse_inode_eq
* Struck through repros no longer work on HEAD.