* [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir
@ 2023-05-11 14:29 syzbot
2023-05-17 7:29 ` syzbot
2024-02-17 6:55 ` syzbot
0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2023-05-11 14:29 UTC (permalink / raw)
To: adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel,
syzkaller-bugs, tytso
Hello,
syzbot found the following issue on:
HEAD commit: fc4354c6e5c2 Merge tag 'mm-stable-2023-05-06-10-49' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=144e2512280000
kernel config: https://syzkaller.appspot.com/x/.config?x=73a06f6ef2d5b492
dashboard link: https://syzkaller.appspot.com/bug?extid=34a0f26f0f61c4888ea4
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5f4adc5d40b0/disk-fc4354c6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0e06af6b6985/vmlinux-fc4354c6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d99bbab1361/bzImage-fc4354c6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+34a0f26f0f61c4888ea4@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1523
Read of size 1 at addr ffff88807ed202cc by task syz-executor.2/19699
CPU: 0 PID: 19699 Comm: syz-executor.2 Not tainted 6.3.0-syzkaller-13466-gfc4354c6e5c2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:351 [inline]
print_report+0x163/0x540 mm/kasan/report.c:462
kasan_report+0x176/0x1b0 mm/kasan/report.c:572
ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1523
ext4_find_inline_entry+0x4ba/0x5e0 fs/ext4/inline.c:1708
__ext4_find_entry+0x2b4/0x1b30 fs/ext4/namei.c:1596
ext4_lookup_entry fs/ext4/namei.c:1751 [inline]
ext4_lookup+0x17a/0x750 fs/ext4/namei.c:1819
lookup_one_qstr_excl+0x11b/0x250 fs/namei.c:1605
do_renameat2+0x6e1/0x1660 fs/namei.c:4952
__do_sys_rename fs/namei.c:5048 [inline]
__se_sys_rename fs/namei.c:5046 [inline]
__x64_sys_rename+0x86/0x90 fs/namei.c:5046
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9f7ce8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f9f7dc30168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f9f7cfabf80 RCX: 00007f9f7ce8c169
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000020000440
RBP: 00007f9f7cee7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd9ebba38f R14: 00007f9f7dc30300 R15: 0000000000022000
</TASK>
The buggy address belongs to the physical page:
page:ffffea0001fb4800 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x7ed20
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffffea0001e19608 ffffea00012b0208 0000000000000000
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 15769, tgid 15769 (udevd), ts 3435881805689, free_ts 3440975634402
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731
prep_new_page mm/page_alloc.c:1738 [inline]
get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502
__alloc_pages+0x255/0x670 mm/page_alloc.c:4768
alloc_slab_page+0x6a/0x160 mm/slub.c:1851
allocate_slab mm/slub.c:1998 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2051
___slab_alloc+0xa85/0x10a0 mm/slub.c:3192
__slab_alloc mm/slub.c:3291 [inline]
__slab_alloc_node mm/slub.c:3344 [inline]
slab_alloc_node mm/slub.c:3441 [inline]
slab_alloc mm/slub.c:3459 [inline]
__kmem_cache_alloc_lru mm/slub.c:3466 [inline]
kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:3475
getname_flags+0xbc/0x4e0 fs/namei.c:140
do_sys_openat2+0xd6/0x500 fs/open.c:1350
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x247/0x290 fs/open.c:1383
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 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:1302 [inline]
free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2659
discard_slab mm/slub.c:2097 [inline]
__unfreeze_partials+0x1b1/0x1f0 mm/slub.c:2636
put_cpu_partial+0x116/0x180 mm/slub.c:2712
qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711
slab_alloc_node mm/slub.c:3451 [inline]
kmem_cache_alloc_node+0x157/0x350 mm/slub.c:3496
__alloc_skb+0x181/0x420 net/core/skbuff.c:644
alloc_skb include/linux/skbuff.h:1288 [inline]
alloc_skb_with_frags+0xa8/0x750 net/core/skbuff.c:6378
sock_alloc_send_pskb+0x919/0xa50 net/core/sock.c:2729
unix_dgram_sendmsg+0x5b5/0x2050 net/unix/af_unix.c:1944
sock_sendmsg_nosec net/socket.c:724 [inline]
sock_sendmsg net/socket.c:747 [inline]
__sys_sendto+0x475/0x630 net/socket.c:2144
__do_sys_sendto net/socket.c:2156 [inline]
__se_sys_sendto net/socket.c:2152 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2152
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff88807ed20180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807ed20200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88807ed20280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88807ed20300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807ed20380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
---
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir 2023-05-11 14:29 [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir syzbot @ 2023-05-17 7:29 ` syzbot 2023-05-22 12:57 ` yebin (H) 2024-02-17 6:55 ` syzbot 1 sibling, 1 reply; 5+ messages in thread From: syzbot @ 2023-05-17 7:29 UTC (permalink / raw) To: adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel, syzkaller-bugs, tytso syzbot has found a reproducer for the following issue on: HEAD commit: f1fcbaa18b28 Linux 6.4-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1064d8fc280000 kernel config: https://syzkaller.appspot.com/x/.config?x=94af80bb8ddd23c4 dashboard link: https://syzkaller.appspot.com/bug?extid=34a0f26f0f61c4888ea4 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1172c85a280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1694e5ce280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2ddd2c9b7bc9/disk-f1fcbaa1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f999d7594125/vmlinux-f1fcbaa1.xz kernel image: https://storage.googleapis.com/syzbot-assets/eff89a0460f3/bzImage-f1fcbaa1.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/e79f7be33fee/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/0571f920dadd/mount_7.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+34a0f26f0f61c4888ea4@syzkaller.appspotmail.com EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ================================================================== BUG: KASAN: slab-out-of-bounds in ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1539 Read of size 1 at addr ffff88801f58d3ed by task syz-executor303/4999 CPU: 0 PID: 4999 Comm: syz-executor303 Not tainted 6.4.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x163/0x540 mm/kasan/report.c:462 kasan_report+0x176/0x1b0 mm/kasan/report.c:572 ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1539 ext4_find_inline_entry+0x4ba/0x5e0 fs/ext4/inline.c:1719 __ext4_find_entry+0x2b4/0x1b30 fs/ext4/namei.c:1612 ext4_lookup_entry fs/ext4/namei.c:1767 [inline] ext4_lookup+0x17a/0x750 fs/ext4/namei.c:1835 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0x11e9/0x3170 fs/namei.c:3788 do_filp_open+0x234/0x490 fs/namei.c:3818 do_sys_openat2+0x13f/0x500 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd8cce6ccf9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff8e028488 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000010c1d RCX: 00007fd8cce6ccf9 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100 RBP: 0000000000000000 R08: 000000000001f210 R09: 00000000200012c0 R10: 00007fd8bc65f000 R11: 0000000000000246 R12: 00007fff8e0284bc R13: 00007fff8e0284f0 R14: 00007fff8e0284d0 R15: 0000000000000004 </TASK> Allocated by task 4730: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 kmem_cache_alloc_bulk+0x3d2/0x4b0 mm/slub.c:4033 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1309 mas_node_count_gfp lib/maple_tree.c:1367 [inline] mas_preallocate+0x131/0x350 lib/maple_tree.c:5781 vma_iter_prealloc mm/internal.h:1029 [inline] __split_vma+0x1e0/0x7f0 mm/mmap.c:2253 do_vmi_align_munmap+0x4ac/0x1820 mm/mmap.c:2398 do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2530 mmap_region+0x811/0x2250 mm/mmap.c:2578 do_mmap+0x8c9/0xf70 mm/mmap.c:1394 vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4730: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] kmem_cache_free_bulk+0x506/0x760 mm/slub.c:3904 mt_free_bulk lib/maple_tree.c:169 [inline] mas_destroy+0x1c50/0x2310 lib/maple_tree.c:5836 mas_store_prealloc+0x351/0x460 lib/maple_tree.c:5766 vma_complete+0x1ec/0xb40 mm/mmap.c:585 __split_vma+0x7c2/0x7f0 mm/mmap.c:2290 do_vmi_align_munmap+0x4ac/0x1820 mm/mmap.c:2398 do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2530 mmap_region+0x811/0x2250 mm/mmap.c:2578 do_mmap+0x8c9/0xf70 mm/mmap.c:1394 vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801f58d200 which belongs to the cache maple_node of size 256 The buggy address is located 237 bytes to the right of allocated 256-byte region [ffff88801f58d200, ffff88801f58d300) The buggy address belongs to the physical page: page:ffffea00007d6300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f58c head:ffffea00007d6300 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012e4d000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4730, tgid 4730 (S50sshd), ts 42005657182, free_ts 36967331489 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502 __alloc_pages+0x255/0x670 mm/page_alloc.c:4768 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline] kmem_cache_alloc_bulk+0x196/0x4b0 mm/slub.c:4026 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1309 mas_node_count_gfp lib/maple_tree.c:1367 [inline] mas_preallocate+0x131/0x350 lib/maple_tree.c:5781 vma_iter_prealloc mm/internal.h:1029 [inline] mmap_region+0x1342/0x2250 mm/mmap.c:2711 do_mmap+0x8c9/0xf70 mm/mmap.c:1394 vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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:1302 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2659 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc_lru+0x11f/0x2e0 mm/slub.c:3482 __d_alloc+0x31/0x710 fs/dcache.c:1769 d_alloc fs/dcache.c:1849 [inline] d_alloc_parallel+0xce/0x13a0 fs/dcache.c:2638 lookup_open fs/namei.c:3417 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0x90e/0x3170 fs/namei.c:3788 do_filp_open+0x234/0x490 fs/namei.c:3818 do_sys_openat2+0x13f/0x500 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1383 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88801f58d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f58d300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801f58d380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801f58d400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f58d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir 2023-05-17 7:29 ` syzbot @ 2023-05-22 12:57 ` yebin (H) 0 siblings, 0 replies; 5+ messages in thread From: yebin (H) @ 2023-05-22 12:57 UTC (permalink / raw) To: syzbot, adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel, syzkaller-bugs, tytso On 2023/5/17 15:29, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: f1fcbaa18b28 Linux 6.4-rc2 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1064d8fc280000 > kernel config: https://syzkaller.appspot.com/x/.config?x=94af80bb8ddd23c4 > dashboard link: https://syzkaller.appspot.com/bug?extid=34a0f26f0f61c4888ea4 > compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1172c85a280000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1694e5ce280000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/2ddd2c9b7bc9/disk-f1fcbaa1.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/f999d7594125/vmlinux-f1fcbaa1.xz > kernel image: https://storage.googleapis.com/syzbot-assets/eff89a0460f3/bzImage-f1fcbaa1.xz > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/e79f7be33fee/mount_0.gz > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/0571f920dadd/mount_7.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+34a0f26f0f61c4888ea4@syzkaller.appspotmail.com > > EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem > EXT4-fs (loop0): 1 truncate cleaned up > EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. > ================================================================== > BUG: KASAN: slab-out-of-bounds in ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1539 > Read of size 1 at addr ffff88801f58d3ed by task syz-executor303/4999 > > CPU: 0 PID: 4999 Comm: syz-executor303 Not tainted 6.4.0-rc2-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:351 [inline] > print_report+0x163/0x540 mm/kasan/report.c:462 > kasan_report+0x176/0x1b0 mm/kasan/report.c:572 > ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1539 > ext4_find_inline_entry+0x4ba/0x5e0 fs/ext4/inline.c:1719 > __ext4_find_entry+0x2b4/0x1b30 fs/ext4/namei.c:1612 > ext4_lookup_entry fs/ext4/namei.c:1767 [inline] > ext4_lookup+0x17a/0x750 fs/ext4/namei.c:1835 > lookup_open fs/namei.c:3470 [inline] > open_last_lookups fs/namei.c:3560 [inline] > path_openat+0x11e9/0x3170 fs/namei.c:3788 > do_filp_open+0x234/0x490 fs/namei.c:3818 > do_sys_openat2+0x13f/0x500 fs/open.c:1356 > do_sys_open fs/open.c:1372 [inline] > __do_sys_open fs/open.c:1380 [inline] > __se_sys_open fs/open.c:1376 [inline] > __x64_sys_open+0x225/0x270 fs/open.c:1376 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7fd8cce6ccf9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fff8e028488 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 > RAX: ffffffffffffffda RBX: 0000000000010c1d RCX: 00007fd8cce6ccf9 > RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100 > RBP: 0000000000000000 R08: 000000000001f210 R09: 00000000200012c0 > R10: 00007fd8bc65f000 R11: 0000000000000246 R12: 00007fff8e0284bc > R13: 00007fff8e0284f0 R14: 00007fff8e0284d0 R15: 0000000000000004 > </TASK> > > Allocated by task 4730: > kasan_save_stack mm/kasan/common.c:45 [inline] > kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 > __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 > kasan_slab_alloc include/linux/kasan.h:186 [inline] > slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 > kmem_cache_alloc_bulk+0x3d2/0x4b0 mm/slub.c:4033 > mt_alloc_bulk lib/maple_tree.c:164 [inline] > mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1309 > mas_node_count_gfp lib/maple_tree.c:1367 [inline] > mas_preallocate+0x131/0x350 lib/maple_tree.c:5781 > vma_iter_prealloc mm/internal.h:1029 [inline] > __split_vma+0x1e0/0x7f0 mm/mmap.c:2253 > do_vmi_align_munmap+0x4ac/0x1820 mm/mmap.c:2398 > do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2530 > mmap_region+0x811/0x2250 mm/mmap.c:2578 > do_mmap+0x8c9/0xf70 mm/mmap.c:1394 > vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 > ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > > Freed by task 4730: > kasan_save_stack mm/kasan/common.c:45 [inline] > kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 > kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 > ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 > kasan_slab_free include/linux/kasan.h:162 [inline] > slab_free_hook mm/slub.c:1781 [inline] > slab_free_freelist_hook mm/slub.c:1807 [inline] > slab_free mm/slub.c:3786 [inline] > kmem_cache_free_bulk+0x506/0x760 mm/slub.c:3904 > mt_free_bulk lib/maple_tree.c:169 [inline] > mas_destroy+0x1c50/0x2310 lib/maple_tree.c:5836 > mas_store_prealloc+0x351/0x460 lib/maple_tree.c:5766 > vma_complete+0x1ec/0xb40 mm/mmap.c:585 > __split_vma+0x7c2/0x7f0 mm/mmap.c:2290 > do_vmi_align_munmap+0x4ac/0x1820 mm/mmap.c:2398 > do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2530 > mmap_region+0x811/0x2250 mm/mmap.c:2578 > do_mmap+0x8c9/0xf70 mm/mmap.c:1394 > vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 > ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > > The buggy address belongs to the object at ffff88801f58d200 > which belongs to the cache maple_node of size 256 > The buggy address is located 237 bytes to the right of > allocated 256-byte region [ffff88801f58d200, ffff88801f58d300) > > The buggy address belongs to the physical page: > page:ffffea00007d6300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f58c > head:ffffea00007d6300 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) > page_type: 0xffffffff() > raw: 00fff00000010200 ffff888012e4d000 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4730, tgid 4730 (S50sshd), ts 42005657182, free_ts 36967331489 > set_page_owner include/linux/page_owner.h:31 [inline] > post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731 > prep_new_page mm/page_alloc.c:1738 [inline] > get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502 > __alloc_pages+0x255/0x670 mm/page_alloc.c:4768 > alloc_slab_page+0x6a/0x160 mm/slub.c:1851 > allocate_slab mm/slub.c:1998 [inline] > new_slab+0x84/0x2f0 mm/slub.c:2051 > ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192 > __kmem_cache_alloc_bulk mm/slub.c:3951 [inline] > kmem_cache_alloc_bulk+0x196/0x4b0 mm/slub.c:4026 > mt_alloc_bulk lib/maple_tree.c:164 [inline] > mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1309 > mas_node_count_gfp lib/maple_tree.c:1367 [inline] > mas_preallocate+0x131/0x350 lib/maple_tree.c:5781 > vma_iter_prealloc mm/internal.h:1029 [inline] > mmap_region+0x1342/0x2250 mm/mmap.c:2711 > do_mmap+0x8c9/0xf70 mm/mmap.c:1394 > vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 > ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x41/0xc0 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:1302 [inline] > free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564 > free_unref_page+0x37/0x3f0 mm/page_alloc.c:2659 > qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 > kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 > __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 > kasan_slab_alloc include/linux/kasan.h:186 [inline] > slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 > slab_alloc_node mm/slub.c:3451 [inline] > slab_alloc mm/slub.c:3459 [inline] > __kmem_cache_alloc_lru mm/slub.c:3466 [inline] > kmem_cache_alloc_lru+0x11f/0x2e0 mm/slub.c:3482 > __d_alloc+0x31/0x710 fs/dcache.c:1769 > d_alloc fs/dcache.c:1849 [inline] > d_alloc_parallel+0xce/0x13a0 fs/dcache.c:2638 > lookup_open fs/namei.c:3417 [inline] > open_last_lookups fs/namei.c:3560 [inline] > path_openat+0x90e/0x3170 fs/namei.c:3788 > do_filp_open+0x234/0x490 fs/namei.c:3818 > do_sys_openat2+0x13f/0x500 fs/open.c:1356 > do_sys_open fs/open.c:1372 [inline] > __do_sys_openat fs/open.c:1388 [inline] > __se_sys_openat fs/open.c:1383 [inline] > __x64_sys_openat+0x247/0x290 fs/open.c:1383 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > > Memory state around the buggy address: > ffff88801f58d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88801f58d300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >> ffff88801f58d380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ^ > ffff88801f58d400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88801f58d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > > --- > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > . According to C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1694e5ce280000. Above issue is is caused by write raw block device. ... syz_mount_image(0x20000080, 0x20000480, 0xc0ed0006, 0x20000140, 0xfe, 0x43e, 0x200004c0); memcpy((void*)0x20000040, "./bus\000", 6); syscall(__NR_creat, 0x20000040ul, 0ul); memcpy((void*)0x20001280, "/dev/loop", 9); *(uint8_t*)0x20001289 = 0x30; *(uint8_t*)0x2000128a = 0; memcpy((void*)0x20001240, "./bus\000", 6); syscall(__NR_mount, 0x20001280ul, 0x20001240ul, 0ul, 0x1000ul, 0ul); --> 'bus' is mounted bind to /dev/loop0 memcpy((void*)0x20000780, "./bus\000", 6); res = syscall(__NR_open, 0x20000780ul, 0x14103eul, 0ul); if (res != -1) r[0] = res; memcpy((void*)0x20000040, "./file0\000", 8); syscall(__NR_chdir, 0x20000040ul); memcpy((void*)0x20000000, "cpuacct.usage_sys\000", 18); syscall(__NR_openat, 0xffffff9c, 0x20000000ul, 0x275aul, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x600000ul, 0x2000002ul, 0x11ul, r[0], 0ul); --> mmap 'bus' memcpy((void*)0x20000200, "ntfs3\000", 6); memcpy((void*)0x20000100, "./bus\000", 6); sprintf((char*)0x20000240, "0x%016llx", (long long)-1); sprintf((char*)0x20000252, "0x%016llx", (long long)-1); *(uint8_t*)0x20000264 = r[0]; memcpy( (void*)0x200012c0, "\x78\x9c\xec\xdd\x09\x9c\x4d\xe5\xff\x07\xf0\xe7\xec\xfb\xbe\x5c\xbb\xc1" "\x58\x43\xb6\x44\xb2\xef\xb2\x6f\x21\xd9\xb2\xef\xd9\x42\x2a\x24\x5b\x92" "\x22\x24\x5b\x92\x2d\x49\xa8\x24\x89\x24\x5a\x44\x65\x4b\x48\x92\x24\x49" "\x25\x24\xf1\x7f\xcd\x9d\x3b\x93\x99\xb9\x7e\x35\xea\x5f\xe9\xf9\xbc\x5f" "\x2f\x73\xee\x3d\xf7\x9c\xe7\x39\xe7\x7c\xee\x19\xf3\x3d\xe7\xdc\x73\xbf" ... ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir 2023-05-11 14:29 [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir syzbot 2023-05-17 7:29 ` syzbot @ 2024-02-17 6:55 ` syzbot 2024-02-19 11:38 ` Jan Kara 1 sibling, 1 reply; 5+ messages in thread From: syzbot @ 2024-02-17 6:55 UTC (permalink / raw) To: adilger.kernel, axboe, brauner, jack, linux-ext4, linux-fsdevel, linux-kernel, syzkaller-bugs, tytso, yebin10 syzbot suspects this issue was fixed by commit: commit 6f861765464f43a71462d52026fbddfc858239a5 Author: Jan Kara <jack@suse.cz> Date: Wed Nov 1 17:43:10 2023 +0000 fs: Block writes to mounted block devices bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12d6758a180000 start commit: 7475e51b8796 Merge tag 'net-6.7-rc2' of git://git.kernel.o.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=d05dd66e2eb2c872 dashboard link: https://syzkaller.appspot.com/bug?extid=34a0f26f0f61c4888ea4 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10221a14e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112fd18f680000 If the result looks correct, please mark the issue as fixed by replying with: #syz fix: fs: Block writes to mounted block devices For information about bisection process see: https://goo.gl/tpsmEJ#bisection ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir 2024-02-17 6:55 ` syzbot @ 2024-02-19 11:38 ` Jan Kara 0 siblings, 0 replies; 5+ messages in thread From: Jan Kara @ 2024-02-19 11:38 UTC (permalink / raw) To: syzbot Cc: adilger.kernel, axboe, brauner, jack, linux-ext4, linux-fsdevel, linux-kernel, syzkaller-bugs, tytso, yebin10 On Fri 16-02-24 22:55:04, syzbot wrote: > syzbot suspects this issue was fixed by commit: > > commit 6f861765464f43a71462d52026fbddfc858239a5 > Author: Jan Kara <jack@suse.cz> > Date: Wed Nov 1 17:43:10 2023 +0000 > > fs: Block writes to mounted block devices > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12d6758a180000 > start commit: 7475e51b8796 Merge tag 'net-6.7-rc2' of git://git.kernel.o.. > git tree: upstream > kernel config: https://syzkaller.appspot.com/x/.config?x=d05dd66e2eb2c872 > dashboard link: https://syzkaller.appspot.com/bug?extid=34a0f26f0f61c4888ea4 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10221a14e80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112fd18f680000 > > If the result looks correct, please mark the issue as fixed by replying with: Makes sense. #syz fix: fs: Block writes to mounted block devices Honza -- Jan Kara <jack@suse.com> SUSE Labs, CR ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-02-19 11:38 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-05-11 14:29 [syzbot] [ext4?] KASAN: use-after-free Read in ext4_search_dir syzbot 2023-05-17 7:29 ` syzbot 2023-05-22 12:57 ` yebin (H) 2024-02-17 6:55 ` syzbot 2024-02-19 11:38 ` Jan Kara
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