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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1fe3:b0:3a6:c976:ed6 with SMTP id e9e14a558f8ab-3a6f199fbf3mr148704705ab.4.1731387864947; Mon, 11 Nov 2024 21:04:24 -0800 (PST) Date: Mon, 11 Nov 2024 21:04:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6732e1d8.050a0220.138bd5.00d3.GAE@google.com> Subject: [syzbot] [nilfs?] KASAN: use-after-free Read in nilfs_find_entry From: syzbot To: konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org, linux-nilfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 906bd684e4b1 Merge tag 'spi-fix-v6.12-rc6' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1418ee30580000 kernel config: https://syzkaller.appspot.com/x/.config?x=64aa0d9945bd5c1 dashboard link: https://syzkaller.appspot.com/bug?extid=96d5d14c47d97015c624 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=1218ee30580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13647f40580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-906bd684.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/88c5c4ba7e33/vmlinux-906bd684.xz kernel image: https://storage.googleapis.com/syzbot-assets/07094e69f47b/bzImage-906bd684.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/b427c083d0d8/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+96d5d14c47d97015c624@syzkaller.appspotmail.com ======================================================= ================================================================== BUG: KASAN: use-after-free in nilfs_find_entry+0x29c/0x660 fs/nilfs2/dir.c:321 Read of size 2 at addr ffff888048f39008 by task syz-executor334/5310 CPU: 0 UID: 0 PID: 5310 Comm: syz-executor334 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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 nilfs_find_entry+0x29c/0x660 fs/nilfs2/dir.c:321 nilfs_inode_by_name+0xad/0x240 fs/nilfs2/dir.c:394 nilfs_lookup+0xed/0x210 fs/nilfs2/namei.c:63 lookup_open fs/namei.c:3573 [inline] open_last_lookups fs/namei.c:3694 [inline] path_openat+0x11a7/0x3590 fs/namei.c:3930 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd472823b99 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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:00007fff91507d48 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6569727261626f6e RCX: 00007fd472823b99 RDX: 000000000000275a RSI: 0000000020000080 RDI: 00000000ffffff9c RBP: 00007fd4728975f0 R08: 0000000000000ee3 R09: 00005555568904c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff91507d70 R13: 00007fff91507f98 R14: 431bde82d7b634db R15: 00007fd47286c03b The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f0a3df02 pfn:0x48f39 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea000123ce88 ffff88801fc44cb0 0000000000000000 raw: 00000007f0a3df02 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5300, tgid 5300 (sshd), ts 68164329439, free_ts 68237870503 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x303f/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 folio_alloc_mpol_noprof mm/mempolicy.c:2283 [inline] vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2314 folio_prealloc+0x31/0x170 alloc_anon_folio mm/memory.c:4727 [inline] do_anonymous_page mm/memory.c:4784 [inline] do_pte_missing mm/memory.c:3963 [inline] handle_pte_fault+0x24dd/0x6820 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6077 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 5300 tgid 5300 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_folios+0xf12/0x18d0 mm/page_alloc.c:2686 folios_put_refs+0x76c/0x860 mm/swap.c:1007 free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 vms_clear_ptes+0x437/0x530 mm/vma.c:1103 vms_complete_munmap_vmas+0x208/0x910 mm/vma.c:1147 do_vmi_align_munmap+0x613/0x730 mm/vma.c:1356 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1404 __vm_munmap+0x24c/0x480 mm/mmap.c:1613 __do_sys_munmap mm/mmap.c:1630 [inline] __se_sys_munmap mm/mmap.c:1627 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1627 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888048f38f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888048f38f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888048f39000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888048f39080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888048f39100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== --- This report is generated by a bot. 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