syzbot


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

Status: upstream: reported C repro on 2023/01/04 17:37
Reported-by: syzbot+b90cfae120fee25396b5@syzkaller.appspotmail.com
First crash: 531d, last: 470d

Sample crash report:
attempt to access beyond end of device
loop0: rw=2049, want=57344, limit=40427
attempt to access beyond end of device
loop0: rw=2049, want=57352, limit=40427
==================================================================
BUG: KASAN: slab-out-of-bounds in __roll_back_blkaddrs fs/f2fs/file.c:1001 [inline]
BUG: KASAN: slab-out-of-bounds in __exchange_data_block+0x2dbc/0x30a0 fs/f2fs/file.c:1137
Read of size 4 at addr ffff88809236c8a0 by task syz-executor263/8119

CPU: 0 PID: 8119 Comm: syz-executor263 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
 kasan_report mm/kasan/report.c:408 [inline]
 __asan_report_load4_noabort+0x68/0x70 mm/kasan/report.c:428
 __roll_back_blkaddrs fs/f2fs/file.c:1001 [inline]
 __exchange_data_block+0x2dbc/0x30a0 fs/f2fs/file.c:1137
 f2fs_move_file_range fs/f2fs/file.c:2330 [inline]
 f2fs_ioc_move_range fs/f2fs/file.c:2376 [inline]
 f2fs_ioctl+0x52b3/0x6b70 fs/f2fs/file.c:2698
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd26ae79619
RSP: 002b:00007fd263dc22f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd26af037b0 RCX: 00007fd26ae79619
RDX: 0000000020000100 RSI: 00000000c020f509 RDI: 0000000000000004
RBP: 00007fd26aed05a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 6c5f657669746361
R13: 0030656c69662f2e R14: 0031656c69662f2e R15: 00007fd26af037b8

Allocated by task 8119:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x4c/0x70 mm/slab.c:3689
 kmalloc_node include/linux/slab.h:530 [inline]
 kvmalloc_node+0x84/0xc0 mm/util.c:432
 kvmalloc include/linux/mm.h:531 [inline]
 kvzalloc include/linux/mm.h:539 [inline]
 __exchange_data_block+0x132/0x30a0 fs/f2fs/file.c:1111
 f2fs_move_file_range fs/f2fs/file.c:2330 [inline]
 f2fs_ioc_move_range fs/f2fs/file.c:2376 [inline]
 f2fs_ioctl+0x52b3/0x6b70 fs/f2fs/file.c:2698
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888092368900
 which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 16288 bytes inside of
 16384-byte region [ffff888092368900, ffff88809236c900)
The buggy address belongs to the page:
page:ffffea000248da00 count:1 mapcount:0 mapping:ffff888092368900 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff888092368900 0000000000000000 0000000100000001
raw: ffffea00027bea20 ffff88813fe64c48 ffff88813fe65200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809236c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809236c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809236c880: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88809236c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809236c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/27 20:47 linux-4.14.y 7878a41b6cc1 9189cb53 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/03/06 09:33 linux-4.14.y 7878a41b6cc1 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/03/01 02:35 linux-4.14.y 7878a41b6cc1 95aee97a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/02/28 06:29 linux-4.14.y 7878a41b6cc1 95aee97a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/02/27 12:56 linux-4.14.y 7878a41b6cc1 9189cb53 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/02/12 17:02 linux-4.14.y a8ad60f2af58 93e26d60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/01/16 21:03 linux-4.14.y c4215ee4771b a63719e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/01/07 04:11 linux-4.14.y c4215ee4771b 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
2023/01/04 17:37 linux-4.14.y c4215ee4771b 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 KASAN: slab-out-of-bounds Read in __exchange_data_block
* Struck through repros no longer work on HEAD.