syzbot


UBSAN: array-index-out-of-bounds in truncate_inode_pages_range

Status: upstream: reported C repro on 2022/09/01 00:13
Reported-by: syzbot+5867885efe39089b339b@syzkaller.appspotmail.com
First crash: 91d, last: 6d03h

Cause bisection: failed (bisect log)
Patch testing requests:
Created Duration User Patch Repo Result
2022/10/14 17:35 20m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 55be6084c8e0e0ada9278c2ab60b7a584378efda report log
2022/10/12 18:20 0m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4899a36f91a9f9b06878471096bd143e7253006d error
2022/10/12 17:48 0m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4899a36f91a9f9b06878471096bd143e7253006d error
2022/10/12 17:33 0m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4899a36f91a9f9b06878471096bd143e7253006d error
2022/10/12 01:58 19m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4899a36f91a9f9b06878471096bd143e7253006d report log
2022/10/12 01:54 19m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4899a36f91a9f9b06878471096bd143e7253006d report log
2022/10/11 23:31 12m vishal.moola@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4899a36f91a9f9b06878471096bd143e7253006d report log

Sample crash report:
ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512)
==================================================================
BUG: KASAN: out-of-bounds in folio_batch_count include/linux/pagevec.h:108 [inline]
BUG: KASAN: out-of-bounds in truncate_inode_pages_range+0x512/0x17b0 mm/truncate.c:366
Read of size 1 at addr ffffc9000b40f8a0 by task syz-executor300/12162

CPU: 1 PID: 12162 Comm: syz-executor300 Not tainted 6.0.0-syzkaller-07994-ge8bc52cb8df8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x220 mm/kasan/report.c:433
 kasan_report+0xfb/0x130 mm/kasan/report.c:495
 folio_batch_count include/linux/pagevec.h:108 [inline]
 truncate_inode_pages_range+0x512/0x17b0 mm/truncate.c:366
 ntfs_evict_inode+0x18/0xb0 fs/ntfs3/inode.c:1741
 evict+0x2a4/0x620 fs/inode.c:664
 ntfs_fill_super+0x3c6c/0x4420 fs/ntfs3/super.c:1190
 get_tree_bdev+0x400/0x620 fs/super.c:1323
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1170f482fa
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 a8 00 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f1170eee168 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f1170f482fa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f1170eee180
RBP: 0000000000000004 R08: 00007f1170eee1c0 R09: 00007f1170eee6b8
R10: 0000000000000000 R11: 0000000000000286 R12: 00007f1170eee1c0
R13: 0000000000000110 R14: 00007f1170eee180 R15: 0000000020001b80
 </TASK>

The buggy address belongs to stack of task syz-executor300/12162
 and is located at offset 32 in frame:
 truncate_inode_pages_range+0x0/0x17b0

This frame has 2 objects:
 [32, 160) 'fbatch'
 [192, 312) 'indices'

The buggy address belongs to the virtual mapping at
 [ffffc9000b408000, ffffc9000b411000) created by:
 dup_task_struct+0x8b/0x490 kernel/fork.c:977

The buggy address belongs to the physical page:
page:ffffea0001d7b300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x75ecc
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 12161, tgid 12161 (syz-executor300), ts 362387697256, free_ts 362353989799
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 vm_area_alloc_pages mm/vmalloc.c:2958 [inline]
 __vmalloc_area_node mm/vmalloc.c:3026 [inline]
 __vmalloc_node_range+0x8f4/0x1290 mm/vmalloc.c:3196
 alloc_thread_stack_node+0x307/0x500 kernel/fork.c:312
 dup_task_struct+0x8b/0x490 kernel/fork.c:977
 copy_process+0x637/0x3f60 kernel/fork.c:2085
 kernel_clone+0x22f/0x7a0 kernel/fork.c:2671
 __do_sys_clone kernel/fork.c:2805 [inline]
 __se_sys_clone kernel/fork.c:2789 [inline]
 __x64_sys_clone+0x276/0x2e0 kernel/fork.c:2789
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
 mm_free_pgd kernel/fork.c:737 [inline]
 __mmdrop+0xae/0x3f0 kernel/fork.c:788
 exit_mm+0x211/0x2f0 kernel/exit.c:510
 do_exit+0x4e1/0x20a0 kernel/exit.c:782
 do_group_exit+0x23b/0x2f0 kernel/exit.c:925
 get_signal+0x172f/0x1780 kernel/signal.c:2857
 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffffc9000b40f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000b40f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000b40f880: f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 00
                                  ^
 ffffc9000b40f900: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00
 ffffc9000b40f980: 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
==================================================================

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/11/20 23:41 upstream 894909f95aa1 aea5da89 .config log report syz C
* Struck through repros no longer work on HEAD.
Crashes (30):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/10/08 18:49 upstream e8bc52cb8df8 aea5da89 .config log report syz C KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-qemu-upstream 2022/10/03 19:52 upstream 4fe89d07dcc2 feb56351 .config log report info UBSAN: array-index-out-of-bounds in truncate_inode_pages_range
ci-qemu-upstream-386 2022/09/19 03:39 upstream 38eddeedbbea dd9a85ff .config log report info UBSAN: array-index-out-of-bounds in truncate_inode_pages_range
ci-qemu-upstream-386 2022/08/28 00:09 upstream 89b749d8552d 07177916 .config log report info UBSAN: array-index-out-of-bounds in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/20 10:11 upstream 55be6084c8e0 b31320fc .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/20 03:12 upstream 55be6084c8e0 b31320fc .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/19 00:24 upstream 55be6084c8e0 b31320fc .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/17 14:52 upstream 55be6084c8e0 67cb024c .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/17 00:18 upstream 55be6084c8e0 67cb024c .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/16 23:53 upstream 55be6084c8e0 67cb024c .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/16 12:14 upstream 55be6084c8e0 67cb024c .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/16 00:23 upstream 55be6084c8e0 67cb024c .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/15 11:36 upstream 55be6084c8e0 67cb024c .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/14 16:27 upstream 55be6084c8e0 4954e4b2 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/13 17:08 upstream 55be6084c8e0 adf90437 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/12 01:33 upstream 55be6084c8e0 1353c374 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/12 01:15 upstream 55be6084c8e0 1353c374 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/12 00:09 upstream 55be6084c8e0 1353c374 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/10 17:37 upstream 4899a36f91a9 aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/10 17:33 upstream 4899a36f91a9 aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/10 16:10 upstream 4899a36f91a9 aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/10 01:03 upstream a6afa4199d3d aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/09 22:28 upstream a6afa4199d3d aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/09 21:35 upstream a6afa4199d3d aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/09 19:20 upstream a6afa4199d3d aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/09 10:40 upstream a6afa4199d3d aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/09 07:42 upstream a6afa4199d3d aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/08 20:28 upstream e8bc52cb8df8 aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/08 14:31 upstream e8bc52cb8df8 aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
ci-upstream-kasan-gce-smack-root 2022/10/08 10:05 upstream e8bc52cb8df8 aea5da89 .config log report info KASAN: out-of-bounds Read in truncate_inode_pages_range
* Struck through repros no longer work on HEAD.