syzbot

 sign-in | mailing list | source | docs
🐞 Open [988] ≡ Subsystems 🐞 Fixed [5242] 🐞 Invalid [12509] ⬇ Missing Backports [83] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

BUG: unable to handle kernel paging request in reiserfs_readdir_inode

Status: fixed on 2024/02/21 18:23
Subsystems: reiserfs
[Documentation on labels]
Reported-by: syzbot+3f6ef04b7cf85153b528@syzkaller.appspotmail.com
Fix commit: 6f861765464f fs: Block writes to mounted block devices
First crash: 476d, last: 110d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <jack@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

  fs: Block writes to mounted block devices

  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [reiserfs?] [jfs?] BUG: unable to handle kernel paging request in reiserfs_readdir_inode 1 (4) 2024/02/15 13:21
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: out-of-bounds Read in reiserfs_readdir_inode origin:upstream C 1 27d 361d 0/3 upstream: reported C repro on 2023/04/30 22:45
linux-6.1 KASAN: use-after-free Read in reiserfs_readdir_inode origin:upstream C 1 14d 354d 0/3 upstream: reported C repro on 2023/05/07 23:16
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2024/01/20 10:51 20m retest repro upstream OK log
2024/01/06 08:39 1h45m retest repro upstream report log
2023/12/22 20:14 27m retest repro linux-next OK log
2023/12/22 20:14 15m retest repro upstream report log
2023/12/22 20:14 26m retest repro linux-next OK log
2023/12/08 14:48 14m retest repro upstream report log
2023/10/30 15:59 17m retest repro upstream report log
2023/10/16 09:03 17m retest repro upstream report log
2023/10/16 07:59 31m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2023/10/02 05:43 27m retest repro linux-next report log
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2024/02/15 08:28 4h09m bisect fix upstream job log (1)
2023/08/20 21:08 1h30m bisect fix upstream job log (0) log
2023/05/30 18:25 46m bisect fix upstream job log (0) log
2023/04/18 00:34 51m bisect fix upstream job log (0) log

Sample crash report:
REISERFS (device loop0): Using r5 hash to sort names
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: use-after-free in test_bit_le include/asm-generic/bitops/le.h:21 [inline]
BUG: KASAN: use-after-free in reiserfs_readdir_inode+0xce1/0x14b0 fs/reiserfs/dir.c:147
Read of size 8 at addr ffff8880752af000 by task syz-executor286/5068

CPU: 1 PID: 5068 Comm: syz-executor286 Not tainted 6.7.0-rc2-syzkaller-00095-gd3fa86b1a7b4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0xef/0x190 mm/kasan/generic.c:187
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 test_bit_le include/asm-generic/bitops/le.h:21 [inline]
 reiserfs_readdir_inode+0xce1/0x14b0 fs/reiserfs/dir.c:147
 iterate_dir+0x1e5/0x5b0 fs/readdir.c:106
 __do_sys_getdents64 fs/readdir.c:405 [inline]
 __se_sys_getdents64 fs/readdir.c:390 [inline]
 __x64_sys_getdents64+0x14f/0x2e0 fs/readdir.c:390
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f003cc220e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdb83cfcc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f003cc220e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000004 R08: 00007ffdb83cfcf0 R09: 00007ffdb83cfcf0
R10: 0000000000001131 R11: 0000000000000246 R12: 00007ffdb83cfd10
R13: 00007ffdb83cfd50 R14: 0000000000000003 R15: 0000000000400000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001d4abc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x752af
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0001d05b08 ffffe8ffffc01770 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x100cca(GFP_HIGHUSER_MOVABLE), pid 5064, tgid 5064 (udevd), ts 79382272913, free_ts 79384772944
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 shmem_alloc_folio+0x10d/0x140 mm/shmem.c:1613
 shmem_alloc_and_add_folio+0x147/0x7b0 mm/shmem.c:1653
 shmem_get_folio_gfp+0x623/0x1360 mm/shmem.c:2037
 shmem_get_folio mm/shmem.c:2119 [inline]
 shmem_write_begin+0x15a/0x360 mm/shmem.c:2702
 generic_perform_write+0x278/0x600 mm/filemap.c:3918
 shmem_file_write_iter+0x110/0x140 mm/shmem.c:2878
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x4fa/0xaa0 mm/page_alloc.c:2347
 free_unref_page_list+0xe6/0xb40 mm/page_alloc.c:2533
 release_pages+0x32a/0x14f0 mm/swap.c:1042
 __folio_batch_release+0x77/0xe0 mm/swap.c:1062
 folio_batch_release include/linux/pagevec.h:83 [inline]
 shmem_undo_range+0x57a/0x1030 mm/shmem.c:1004
 shmem_truncate_range mm/shmem.c:1096 [inline]
 shmem_evict_inode+0x39f/0xba0 mm/shmem.c:1224
 evict+0x2ed/0x6b0 fs/inode.c:664
 iput_final fs/inode.c:1775 [inline]
 iput.part.0+0x560/0x7b0 fs/inode.c:1801
 iput+0x5c/0x80 fs/inode.c:1791
 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
 __dentry_kill+0x3b8/0x640 fs/dcache.c:607
 dentry_kill fs/dcache.c:745 [inline]
 dput+0x6de/0xd90 fs/dcache.c:913
 do_renameat2+0xc4c/0xdc0 fs/namei.c:4998
 __do_sys_rename fs/namei.c:5042 [inline]
 __se_sys_rename fs/namei.c:5040 [inline]
 __x64_sys_rename+0x81/0xa0 fs/namei.c:5040
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff8880752aef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880752aef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880752af000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880752af080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880752af100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/24 14:25 upstream d3fa86b1a7b4 5b429f39 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-selinux-root KASAN: use-after-free Read in reiserfs_readdir_inode
2023/08/29 16:29 upstream 1c59d383390f 7ba13a15 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in reiserfs_readdir_inode
2023/06/05 04:42 upstream 6f64a5ebe1dc a4ae4f42 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root KASAN: use-after-free Read in reiserfs_readdir_inode
2023/03/19 00:33 upstream 534293368afa 7939252e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: out-of-bounds Read in reiserfs_readdir_inode
2023/07/08 19:40 linux-next 123212f53f3e 668cb1fa .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in reiserfs_readdir_inode
2023/03/18 20:21 linux-next 6f08c1de13a9 7939252e .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in reiserfs_readdir_inode
2023/01/05 19:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 247f34f7b803 1dac8c7a .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in reiserfs_readdir_inode
2023/01/05 16:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 247f34f7b803 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in reiserfs_readdir_inode
2023/09/04 04:33 upstream db906f0ca6bb 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root UBSAN: array-index-out-of-bounds in reiserfs_readdir_inode
2023/03/18 19:48 linux-next 6f08c1de13a9 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in reiserfs_readdir_inode
2023/04/26 02:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 14f8db1c0f9a 7560799c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in reiserfs_readdir_inode
* Struck through repros no longer work on HEAD.