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: syzbot+8c4acf719c3fc41e8439@xxxxxxxxxxxxxxxxxxxxxxxxx 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 syzkaller@xxxxxxxxxxxxxxxx. 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
