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

Title	Replies (including bot)	Last reply
[PATCH 4.14 000/217] 4.14.67-stable review	213 (213)	2018/08/24 05:19
[PATCH 4.17 00/67] 4.17.7-stable review	74 (74)	2018/07/17 09:41
[PATCH 1/5] f2fs: give message and set need_fsck given broken node id	16 (16)	2018/04/27 01:52
KASAN: slab-out-of-bounds Read in build_segment_manager	0 (1)	2018/04/20 16:55

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: slab-out-of-bounds Read in build_segment_manager f2fs	C		error	5	441d	1299d	0/1	upstream: reported C repro on 2020/10/05 08:04
android-49	KASAN: slab-out-of-bounds Read in build_segment_manager	C			1	2197d	2197d	0/3	closed as invalid on 2020/03/24 18:50

linux-4.14

KASAN: slab-out-of-bounds Read in build_segment_manager f2fs

error

441d

1299d

0/1

upstream: reported C repro on 2020/10/05 08:04

android-49

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

2197d

0/3

closed as invalid on 2020/03/24 18:50

F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop0): invalid crc value ================================================================== BUG: KASAN: slab-out-of-bounds in build_sit_entries fs/f2fs/segment.c:3653 [inline] BUG: KASAN: slab-out-of-bounds in build_segment_manager+0xb92d/0xbf70 fs/f2fs/segment.c:3852 Read of size 4 at addr ffff8801ac7b66e0 by task syzkaller806281/4519 CPU: 0 PID: 4519 Comm: syzkaller806281 Not tainted 4.17.0-rc1+ #8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 build_sit_entries fs/f2fs/segment.c:3653 [inline] build_segment_manager+0xb92d/0xbf70 fs/f2fs/segment.c:3852 f2fs_fill_super+0x4095/0x7bf0 fs/f2fs/super.c:2803 mount_bdev+0x30c/0x3e0 fs/super.c:1165 f2fs_mount+0x34/0x40 fs/f2fs/super.c:3020 mount_fs+0xae/0x328 fs/super.c:1268 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2517 [inline] do_mount+0x564/0x3070 fs/namespace.c:2847 ksys_mount+0x12d/0x140 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4477ca RSP: 002b:00007fff69213888 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000b70 RCX: 00000000004477ca RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff692138c0 RBP: 0000000000000064 R08: 0000000020016600 R09: 000000000000000a R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000064 R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 2845: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 getname_flags+0xd0/0x5a0 fs/namei.c:140 getname+0x19/0x20 fs/namei.c:211 do_sys_open+0x39a/0x740 fs/open.c:1087 __do_sys_open fs/open.c:1111 [inline] __se_sys_open fs/open.c:1106 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1106 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2845: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 putname+0xf2/0x130 fs/namei.c:261 do_sys_open+0x554/0x740 fs/open.c:1102 __do_sys_open fs/open.c:1111 [inline] __se_sys_open fs/open.c:1106 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1106 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801ac7b69c0 which belongs to the cache names_cache of size 4096 The buggy address is located 736 bytes to the left of 4096-byte region [ffff8801ac7b69c0, ffff8801ac7b79c0) The buggy address belongs to the page: page:ffffea0006b1ed80 count:1 mapcount:0 mapping:ffff8801ac7b69c0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801ac7b69c0 0000000000000000 0000000100000001 raw: ffffea0006b1f7a0 ffffea0006b1eea0 ffff8801da988dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ac7b6580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801ac7b6600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801ac7b6680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801ac7b6700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801ac7b6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================