From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3E013D9DA3 for ; Thu, 2 Apr 2026 12:44:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.132 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775133890; cv=none; b=Ng+un1B9Ztq8FuPilJ8m+0C3W+8QFAasFLK8fiIkm2kcB4ZOVUXfS22rzqLGAPnyiub0hu7F44PfsLfjLKACFEP12cSPLqvG+FKMqaNaIuz2l3v1D1IlnI+GRHw+zl25CNjjzcXeLIfJWeh/J8Et0Y13ZOm98jOcJlqpTXy5xCk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775133890; c=relaxed/simple; bh=OM6W7GJovMK2GJsZG64EJ7pmqDJUIyGd7DFylW/DnWY=; h=Message-ID:Date:MIME-Version:Subject:To:References:Cc:From: In-Reply-To:Content-Type; b=FJDPQYopyOReW2lNgpsDlRVoDvxWBvcMiR6ynvGp69aUBS2HhJY7wDFQLcqd4AOl3tzbIgiuirKqByBlIgjBeQ3k1raDf4QKdon9XuHdF0CYevj/0/J2DwN2uJxWz3TcfT9jqIp0JkBS6VdwOq0lf/63uzImg+ypaDW9ArO343Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=x+fBqJ0t; arc=none smtp.client-ip=115.124.30.132 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="x+fBqJ0t" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1775133869; h=Message-ID:Date:MIME-Version:Subject:To:From:Content-Type; bh=KztMsmOUY1Ibu2Pzo0J9qWqTSNS17177ED1rj4a7lDo=; b=x+fBqJ0tDFhN7aXqxAUTA5aL6wW03dMslFUmRZxbXfbIRWA+vSGp90YUfPD2ecLbrsXh4hL4dOzGvWs1okCIaFflcTK6gncVkSRrhT0KhpePvoZi8rd0DcR2jZ5KcTQWSiD1mYBLnMqWSkTofChRAQWOOc7UOpZjG5Fot14ZPk0= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045133197;MF=joseph.qi@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0X0HKSh1_1775133868; Received: from 30.221.145.69(mailfrom:joseph.qi@linux.alibaba.com fp:SMTPD_---0X0HKSh1_1775133868 cluster:ay36) by smtp.aliyun-inc.com; Thu, 02 Apr 2026 20:44:28 +0800 Message-ID: Date: Thu, 2 Apr 2026 20:44:27 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [ocfs2?] KASAN: use-after-free Write in ocfs2_write_end_nolock To: syzbot References: <69ce4799.050a0220.2dbe29.0003.GAE@google.com> Cc: Joel Becker , "linux-kernel@vger.kernel.org" , Mark Fasheh , "ocfs2-devel@lists.linux.dev" , syzkaller-bugs@googlegroups.com From: Joseph Qi In-Reply-To: <69ce4799.050a0220.2dbe29.0003.GAE@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 4/2/26 6:40 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 9147566d8016 Merge tag 'sched_ext-for-7.0-rc6-fixes' of gi.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=13ec1516580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d46eab0cfd31c214 > dashboard link: https://syzkaller.appspot.com/bug?extid=62c1793956716ea8b28a > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9147566d.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/ccabfb43ed2d/vmlinux-9147566d.xz > kernel image: https://storage.googleapis.com/syzbot-assets/2106f2f69253/bzImage-9147566d.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+62c1793956716ea8b28a@syzkaller.appspotmail.com > > loop0: detected capacity change from 0 to 32768 > ======================================================= > WARNING: The mand mount option has been deprecated and > and is ignored by this kernel. Remove the mand > option from the mount to silence this warning. > ======================================================= > JBD2: Ignoring recovery information on journal > ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. > (syz.0.0,5322,0):ocfs2_check_set_options:1244 ERROR: Invalid heartbeat mount options > loop0: detected capacity change from 32768 to 32767 > OCFS2: ERROR (device loop0): int ocfs2_validate_inode_block(struct super_block *, struct buffer_head *): Invalid dinode #17058: signature = ��� > On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. > OCFS2: File system is now read-only. > (syz.0.0,5322,0):ocfs2_assign_bh:2417 ERROR: status = -30 > (syz.0.0,5322,0):ocfs2_inode_lock_full_nested:2512 ERROR: status = -30 > (syz.0.0,5322,0):ocfs2_reflink_inodes_lock:4748 ERROR: status = -30 > ================================================================== > BUG: KASAN: use-after-free in memcpy_from_folio include/linux/highmem.h:586 [inline] > BUG: KASAN: use-after-free in ocfs2_write_end_inline fs/ocfs2/aops.c:1915 [inline] > BUG: KASAN: use-after-free in ocfs2_write_end_nolock+0xbd9/0x18f0 fs/ocfs2/aops.c:1949 > Write of size 4086 at addr ffff888056da54d2 by task syz.0.0/5322 > > CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > Call Trace: > > dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:378 [inline] > print_report+0xba/0x230 mm/kasan/report.c:482 > kasan_report+0x117/0x150 mm/kasan/report.c:595 > check_region_inline mm/kasan/generic.c:-1 [inline] > kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 > __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 > memcpy_from_folio include/linux/highmem.h:586 [inline] > ocfs2_write_end_inline fs/ocfs2/aops.c:1915 [inline] > ocfs2_write_end_nolock+0xbd9/0x18f0 fs/ocfs2/aops.c:1949 > ocfs2_write_end+0x58/0x90 fs/ocfs2/aops.c:2059 > generic_perform_write+0x620/0x8f0 mm/filemap.c:4340 > ocfs2_file_write_iter+0x1663/0x1ed0 fs/ocfs2/file.c:2476 > iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736 > do_splice_from fs/splice.c:936 [inline] > direct_splice_actor+0x101/0x160 fs/splice.c:1159 > splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103 > do_splice_direct_actor fs/splice.c:1202 [inline] > do_splice_direct+0x195/0x290 fs/splice.c:1228 > vfs_copy_file_range+0xb02/0x1370 fs/read_write.c:1634 > __do_sys_copy_file_range fs/read_write.c:1683 [inline] > __se_sys_copy_file_range+0x2fb/0x480 fs/read_write.c:1650 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f08bb59c819 > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f08bc45dfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 > RAX: ffffffffffffffda RBX: 00007f08bb815fa0 RCX: 00007f08bb59c819 > RDX: 0000000000000004 RSI: 00002000000001c0 RDI: 0000000000000005 > RBP: 00007f08bb632c91 R08: ffffffffa003e45b R09: 0700000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f08bb816038 R14: 00007f08bb815fa0 R15: 00007ffcc83fcca8 > > > The buggy address belongs to the physical page: > page: refcount:2 mapcount:0 mapping:ffff88801cc2e6c8 index:0x854 pfn:0x56da5 > memcg:ffff88801c6c0d40 > aops:def_blk_aops ino:700000 dentry name(?):"" > flags: 0x4fff38000004224(referenced|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff) > raw: 04fff38000004224 ffffea000112e0c8 ffff8880304509e0 ffff88801cc2e6c8 > raw: 0000000000000854 ffff888055d47488 00000002ffffffff ffff88801c6c0d40 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5322, tgid 5321 (syz.0.0), ts 84485822747, free_ts 84440366295 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 > prep_new_page mm/page_alloc.c:1897 [inline] > get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 > __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 > alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2490 > alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] > alloc_pages_noprof+0xa8/0x1a0 mm/mempolicy.c:2581 > folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591 > filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013 > __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2011 > __filemap_get_folio include/linux/pagemap.h:763 [inline] > grow_dev_folio fs/buffer.c:1047 [inline] > grow_buffers fs/buffer.c:1113 [inline] > __getblk_slow fs/buffer.c:1131 [inline] > bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1458 > __getblk include/linux/buffer_head.h:380 [inline] > sb_getblk include/linux/buffer_head.h:386 [inline] > ocfs2_read_blocks+0x57e/0x15e0 fs/ocfs2/buffer_head_io.c:236 > ocfs2_read_inode_block_full fs/ocfs2/inode.c:1735 [inline] > ocfs2_read_inode_block+0xec/0x1d0 fs/ocfs2/inode.c:1749 > ocfs2_assign_bh fs/ocfs2/dlmglue.c:2415 [inline] > ocfs2_inode_lock_full_nested+0x2ac/0x1bd0 fs/ocfs2/dlmglue.c:2510 > ocfs2_reflink_inodes_lock+0x477/0xc50 fs/ocfs2/refcounttree.c:4744 > ocfs2_remap_file_range+0x236/0x6f0 fs/ocfs2/file.c:2721 > vfs_copy_file_range+0xd80/0x1370 fs/read_write.c:1600 > __do_sys_copy_file_range fs/read_write.c:1683 [inline] > __se_sys_copy_file_range+0x2fb/0x480 fs/read_write.c:1650 > page last free pid 5322 tgid 5321 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > __free_pages_prepare mm/page_alloc.c:1433 [inline] > free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040 > folios_put_refs+0x789/0x8d0 mm/swap.c:1002 > folio_batch_release include/linux/pagevec.h:101 [inline] > mapping_try_invalidate+0x3c2/0x4c0 mm/truncate.c:579 > loop_set_status+0x29b/0xe40 drivers/block/loop.c:1246 > loop_set_status_old drivers/block/loop.c:1362 [inline] > lo_ioctl+0xce6/0x1fb0 drivers/block/loop.c:1551 > blkdev_ioctl+0x5e3/0x740 block/ioctl.c:804 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Memory state around the buggy address: > ffff888056da5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff888056da5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> ffff888056da6000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ^ > ffff888056da6080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff888056da6100: 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@googlegroups.com. > > 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 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 test diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c index 03a51662ea8e..a2ccd8011706 100644 --- a/fs/ocfs2/inode.c +++ b/fs/ocfs2/inode.c @@ -1505,6 +1505,16 @@ int ocfs2_validate_inode_block(struct super_block *sb, goto bail; } + if (le16_to_cpu(data->id_count) > + ocfs2_max_inline_data_with_xattr(sb, di)) { + rc = ocfs2_error(sb, + "Invalid dinode #%llu: inline data id_count %u exceeds max %d\n", + (unsigned long long)bh->b_blocknr, + le16_to_cpu(data->id_count), + ocfs2_max_inline_data_with_xattr(sb, di)); + goto bail; + } + if (le64_to_cpu(di->i_size) > le16_to_cpu(data->id_count)) { rc = ocfs2_error(sb, "Invalid dinode #%llu: inline data i_size %llu exceeds id_count %u\n",