Hello,
syzbot found the following issue on:
HEAD commit: 9221b2819b8a Add linux-next specific files for 20240503
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=130f062f180000
kernel config: https://syzkaller.appspot.com/x/.config?x=8ab537f51a6a0d98
dashboard link: https://syzkaller.appspot.com/bug?extid=8c4acf719c3fc41e8439
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111abc97180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10059004980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3e67dbdc3c37/disk-9221b281.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ade618fa19f8/vmlinux-9221b281.xz
kernel image: https://storage.googleapis.com/syzbot-assets/df12e5073c97/bzImage-9221b281.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/9035c2c41138/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
bcachefs (loop0): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names
bcachefs (loop0): recovering from clean shutdown, journal seq 13
==================================================================
BUG: KASAN: use-after-free in memcpy_dir crypto/scatterwalk.c:23 [inline]
BUG: KASAN: use-after-free in scatterwalk_copychunks+0x1cc/0x460 crypto/scatterwalk.c:38
Read of size 32 at addr ffff888049380000 by task syz-executor169/5094
CPU: 0 PID: 5094 Comm: syz-executor169 Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
memcpy_dir crypto/scatterwalk.c:23 [inline]
scatterwalk_copychunks+0x1cc/0x460 crypto/scatterwalk.c:38
skcipher_next_slow+0x39d/0x480 crypto/skcipher.c:276
skcipher_walk_next+0x634/0xba0 crypto/skcipher.c:361
chacha_simd_stream_xor+0x67f/0xd10 arch/x86/crypto/chacha_glue.c:192
do_encrypt_sg fs/bcachefs/checksum.c:107 [inline]
do_encrypt+0x4de/0x7b0 fs/bcachefs/checksum.c:127
bset_encrypt fs/bcachefs/btree_io.h:120 [inline]
bch2_btree_node_read_done+0x1dca/0x5ed0 fs/bcachefs/btree_io.c:1090
btree_node_read_work+0x665/0x1300 fs/bcachefs/btree_io.c:1345
bch2_btree_node_read+0x2637/0x2c80 fs/bcachefs/btree_io.c:1730
__bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline]
bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1793
read_btree_roots+0x22d/0x7b0 fs/bcachefs/recovery.c:472
bch2_fs_recovery+0x2334/0x36e0 fs/bcachefs/recovery.c:800
bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1030
bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2105
bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917
legacy_get_tree+0xee/0x190 fs/fs_context.c:662
vfs_get_tree+0x90/0x2a0 fs/super.c:1780
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa185da797a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007ffcd1a149e8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffcd1a14a00 RCX: 00007fa185da797a
RDX: 000000002000f640 RSI: 000000002000f680 RDI: 00007ffcd1a14a00
RBP: 0000000000000004 R08: 00007ffcd1a14a40 R09: 000000000000f62b
R10: 0000000000010400 R11: 0000000000000282 R12: 0000000000010400
R13: 00007ffcd1a14a40 R14: 0000000000000003 R15: 0000000001000000
</TASK>
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49380
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffffea0001249008 ffffea0001223008 0000000000000000
raw: 0000000000000000 0000000000000006 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500cc2(GFP_HIGHUSER|__GFP_ACCOUNT), pid 4945, tgid 4945 (sshd), ts 47548197350, free_ts 47548625509
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
prep_new_page mm/page_alloc.c:1476 [inline]
get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
pipe_write+0x657/0x1a40 fs/pipe.c:513
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa72/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 4947 tgid 4947 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1088 [inline]
free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601
__folio_put+0x3b9/0x620 mm/swap.c:129
pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
pipe_update_tail fs/pipe.c:224 [inline]
pipe_read+0x6f2/0x13e0 fs/pipe.c:344
new_sync_read fs/read_write.c:395 [inline]
vfs_read+0x9c4/0xbd0 fs/read_write.c:476
ksys_read+0x1a0/0x2c0 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88804937ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88804937ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888049380000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff888049380080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888049380100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
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.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
#syz set subsystems: bcachefs
On Sat, May 4, 2024 at 11:57 AM syzbot
<[email protected]> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 9221b2819b8a Add linux-next specific files for 20240503
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=130f062f180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8ab537f51a6a0d98
> dashboard link: https://syzkaller.appspot.com/bug?extid=8c4acf719c3fc41e8439
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111abc97180000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10059004980000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/3e67dbdc3c37/disk-9221b281.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ade618fa19f8/vmlinux-9221b281.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/df12e5073c97/bzImage-9221b281.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/9035c2c41138/mount_0.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
>
> bcachefs (loop0): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names
> bcachefs (loop0): recovering from clean shutdown, journal seq 13
> ==================================================================
> BUG: KASAN: use-after-free in memcpy_dir crypto/scatterwalk.c:23 [inline]
> BUG: KASAN: use-after-free in scatterwalk_copychunks+0x1cc/0x460 crypto/scatterwalk.c:38
> Read of size 32 at addr ffff888049380000 by task syz-executor169/5094
>
> CPU: 0 PID: 5094 Comm: syz-executor169 Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
> print_address_description mm/kasan/report.c:377 [inline]
> print_report+0x169/0x550 mm/kasan/report.c:488
> kasan_report+0x143/0x180 mm/kasan/report.c:601
> kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
> __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
> memcpy_dir crypto/scatterwalk.c:23 [inline]
> scatterwalk_copychunks+0x1cc/0x460 crypto/scatterwalk.c:38
> skcipher_next_slow+0x39d/0x480 crypto/skcipher.c:276
> skcipher_walk_next+0x634/0xba0 crypto/skcipher.c:361
> chacha_simd_stream_xor+0x67f/0xd10 arch/x86/crypto/chacha_glue.c:192
> do_encrypt_sg fs/bcachefs/checksum.c:107 [inline]
> do_encrypt+0x4de/0x7b0 fs/bcachefs/checksum.c:127
> bset_encrypt fs/bcachefs/btree_io.h:120 [inline]
> bch2_btree_node_read_done+0x1dca/0x5ed0 fs/bcachefs/btree_io.c:1090
> btree_node_read_work+0x665/0x1300 fs/bcachefs/btree_io.c:1345
> bch2_btree_node_read+0x2637/0x2c80 fs/bcachefs/btree_io.c:1730
> __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline]
> bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1793
> read_btree_roots+0x22d/0x7b0 fs/bcachefs/recovery.c:472
> bch2_fs_recovery+0x2334/0x36e0 fs/bcachefs/recovery.c:800
> bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1030
> bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2105
> bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917
> legacy_get_tree+0xee/0x190 fs/fs_context.c:662
> vfs_get_tree+0x90/0x2a0 fs/super.c:1780
> do_new_mount+0x2be/0xb40 fs/namespace.c:3352
> do_mount fs/namespace.c:3692 [inline]
> __do_sys_mount fs/namespace.c:3898 [inline]
> __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fa185da797a
> Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007ffcd1a149e8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 00007ffcd1a14a00 RCX: 00007fa185da797a
> RDX: 000000002000f640 RSI: 000000002000f680 RDI: 00007ffcd1a14a00
> RBP: 0000000000000004 R08: 00007ffcd1a14a40 R09: 000000000000f62b
> R10: 0000000000010400 R11: 0000000000000282 R12: 0000000000010400
> R13: 00007ffcd1a14a40 R14: 0000000000000003 R15: 0000000001000000
> </TASK>
>
> The buggy address belongs to the physical page:
> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49380
> flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
> page_type: 0xffffff7f(buddy)
> raw: 00fff00000000000 ffffea0001249008 ffffea0001223008 0000000000000000
> raw: 0000000000000000 0000000000000006 00000000ffffff7f 0000000000000000
> page dumped because: kasan: bad access detected
> page_owner tracks the page as freed
> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500cc2(GFP_HIGHUSER|__GFP_ACCOUNT), pid 4945, tgid 4945 (sshd), ts 47548197350, free_ts 47548625509
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
> prep_new_page mm/page_alloc.c:1476 [inline]
> get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438
> __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696
> alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
> pipe_write+0x657/0x1a40 fs/pipe.c:513
> new_sync_write fs/read_write.c:497 [inline]
> vfs_write+0xa72/0xc90 fs/read_write.c:590
> ksys_write+0x1a0/0x2c0 fs/read_write.c:643
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> page last free pid 4947 tgid 4947 stack trace:
> reset_page_owner include/linux/page_owner.h:25 [inline]
> free_pages_prepare mm/page_alloc.c:1088 [inline]
> free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601
> __folio_put+0x3b9/0x620 mm/swap.c:129
> pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
> pipe_update_tail fs/pipe.c:224 [inline]
> pipe_read+0x6f2/0x13e0 fs/pipe.c:344
> new_sync_read fs/read_write.c:395 [inline]
> vfs_read+0x9c4/0xbd0 fs/read_write.c:476
> ksys_read+0x1a0/0x2c0 fs/read_write.c:619
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Memory state around the buggy address:
> ffff88804937ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff88804937ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> >ffff888049380000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ^
> ffff888049380080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ffff888049380100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ==================================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at [email protected].
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> 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.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
> --
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syzbot has bisected this issue to:
commit dc6f2eb000d76ac8f93f4d59a8012ddfccca927a
Author: Kent Overstreet <[email protected]>
Date: Wed Apr 17 05:26:02 2024 +0000
bcachefs: make btree read errors silent during scan
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16629450980000
start commit: 9221b2819b8a Add linux-next specific files for 20240503
git tree: linux-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=15629450980000
console output: https://syzkaller.appspot.com/x/log.txt?x=11629450980000
kernel config: https://syzkaller.appspot.com/x/.config?x=8ab537f51a6a0d98
dashboard link: https://syzkaller.appspot.com/bug?extid=8c4acf719c3fc41e8439
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111abc97180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10059004980000
Reported-by: [email protected]
Fixes: dc6f2eb000d7 ("bcachefs: make btree read errors silent during scan")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection