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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:170b:b0:3eb:b030:e6eb with SMTP id e9e14a558f8ab-3ebb030e7d0mr71193615ab.0.1756111890166; Mon, 25 Aug 2025 01:51:30 -0700 (PDT) Date: Mon, 25 Aug 2025 01:51:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68ac2412.050a0220.37038e.0088.GAE@google.com> Subject: [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_get_system_file_inode From: syzbot To: akpm@linux-foundation.org, heming.zhao@suse.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, linux-kernel@vger.kernel.org, mark@fasheh.com, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8f5ae30d69d7 Linux 6.17-rc1 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1171aa34580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb dashboard link: https://syzkaller.appspot.com/bug?extid=900962ac9bf1860033f2 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14460ef0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12055062580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/b8731c8da9c9/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=10460ef0580000) The issue was bisected to: commit bd1261b16d9131d79723d982d54295e7f309797a Author: Heming Zhao Date: Mon Apr 14 06:01:23 2025 +0000 ocfs2: fix the issue with discontiguous allocation in the global_bitmap bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11473062580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13473062580000 console output: https://syzkaller.appspot.com/x/log.txt?x=15473062580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+900962ac9bf1860033f2@syzkaller.appspotmail.com Fixes: bd1261b16d91 ("ocfs2: fix the issue with discontiguous allocation in the global_bitmap") ================================================================== BUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x17c/0x650 fs/ocfs2/sysfile.c:102 Read of size 8 at addr ffff0000dea2ae10 by task syz-executor/6666 CPU: 1 UID: 0 PID: 6666 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 ocfs2_get_system_file_inode+0x17c/0x650 fs/ocfs2/sysfile.c:102 ocfs2_remove_inode fs/ocfs2/inode.c:723 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:894 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline] ocfs2_evict_inode+0x12e8/0x3bf8 fs/ocfs2/inode.c:1292 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1897 [inline] iput+0x6e4/0x83c fs/inode.c:1923 d_delete_notify include/linux/fsnotify.h:377 [inline] vfs_rmdir+0x358/0x464 fs/namei.c:4474 do_rmdir+0x214/0x4c4 fs/namei.c:4516 __do_sys_unlinkat fs/namei.c:4690 [inline] __se_sys_unlinkat fs/namei.c:4684 [inline] __arm64_sys_unlinkat+0xc8/0xf8 fs/namei.c:4684 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 6734: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x238/0x3e8 mm/slub.c:4236 anon_vma_chain_alloc mm/rmap.c:142 [inline] __anon_vma_prepare+0xc4/0x3fc mm/rmap.c:195 __vmf_anon_prepare mm/memory.c:3506 [inline] vmf_anon_prepare mm/internal.h:432 [inline] do_anonymous_page mm/memory.c:5050 [inline] do_pte_missing mm/memory.c:4232 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x4308/0x4d34 mm/memory.c:6364 do_page_fault+0x410/0x13cc arch/arm64/mm/fault.c:653 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:789 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el0_da+0x64/0x164 arch/arm64/kernel/entry-common.c:697 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 6734: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x74/0x98 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x184/0x550 mm/slub.c:4782 anon_vma_chain_free mm/rmap.c:147 [inline] unlink_anon_vmas+0x48c/0x520 mm/rmap.c:447 free_pgtables+0x3c8/0x5d4 mm/memory.c:413 exit_mmap+0x350/0xabc mm/mmap.c:1291 __mmput+0xec/0x3f4 kernel/fork.c:1130 mmput+0x70/0xac kernel/fork.c:1152 exit_mm+0x13c/0x200 kernel/exit.c:582 do_exit+0x4bc/0x1a14 kernel/exit.c:949 do_group_exit+0x194/0x22c kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] pid_child_should_wake+0x0/0x1dc kernel/exit.c:1111 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000dea2ae00 which belongs to the cache anon_vma_chain of size 80 The buggy address is located 16 bytes inside of freed 80-byte region [ffff0000dea2ae00, ffff0000dea2ae50) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ea2a flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c18ad280 fffffdffc37a8980 0000000000000002 raw: 0000000000000000 0000000000240024 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dea2ad00: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc ffff0000dea2ad80: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff0000dea2ae00: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ^ ffff0000dea2ae80: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ffff0000dea2af00: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address fbd5200000000030 KASAN: maybe wild-memory-access in range [0xdead000000000180-0xdead000000000187] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [fbd5200000000030] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 6666 Comm: syz-executor Tainted: G B 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] pc : do_raw_spin_lock+0x84/0x2cc kernel/locking/spinlock_debug.c:115 lr : __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] lr : _raw_spin_lock+0x50/0x60 kernel/locking/spinlock.c:154 sp : ffff8000a28a7040 x29: ffff8000a28a70c0 x28: 0000000000000000 x27: ffff8000a28a7180 x26: dfff800000000000 x25: ffff700014514e30 x24: dfff800000000000 x23: 0000000000000800 x22: ffff0000dea2ae10 x21: ffff0000c68f0000 x20: dead000000000184 x19: dead000000000180 x18: 00000000ffffffff x17: 3d3d3d3d3d3d3d3d x16: ffff8000805354d8 x15: 0000000000000001 x14: 1ffff0001260d8fc x13: 0000000000000000 x12: 0000000000000000 x11: 1ffff00014514e0c x10: ffff80008efad53b x9 : f3f3f304f1f1f1f1 x8 : 1bd5a00000000030 x7 : 0000000000000001 x6 : ffff800080dd7c18 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : ffff80008b6577c0 x0 : dead000000000180 Call trace: debug_spin_lock_before kernel/locking/spinlock_debug.c:-1 [inline] (P) do_raw_spin_lock+0x84/0x2cc kernel/locking/spinlock_debug.c:115 (P) __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock+0x50/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] igrab+0x20/0xd8 fs/inode.c:1540 ocfs2_get_system_file_inode+0x188/0x650 fs/ocfs2/sysfile.c:104 ocfs2_remove_inode fs/ocfs2/inode.c:723 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:894 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline] ocfs2_evict_inode+0x12e8/0x3bf8 fs/ocfs2/inode.c:1292 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1897 [inline] iput+0x6e4/0x83c fs/inode.c:1923 d_delete_notify include/linux/fsnotify.h:377 [inline] vfs_rmdir+0x358/0x464 fs/namei.c:4474 do_rmdir+0x214/0x4c4 fs/namei.c:4516 __do_sys_unlinkat fs/namei.c:4690 [inline] __se_sys_unlinkat fs/namei.c:4684 [inline] __arm64_sys_unlinkat+0xc8/0xf8 fs/namei.c:4684 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: aa0003f3 f9000feb f2fe7e69 f8386969 (38f86908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: aa0003f3 mov x19, x0 4: f9000feb str x11, [sp, #24] 8: f2fe7e69 movk x9, #0xf3f3, lsl #48 c: f8386969 str x9, [x11, x24] * 10: 38f86908 ldrsb w8, [x8, x24] <-- trapping instruction --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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