From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1B92517BB32 for ; Fri, 20 Sep 2024 14:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726842398; cv=none; b=IRuMlude2WLlg9EQDZH8iTgvsqic/Y/Fursy003mWmfPt10FvRB6Nz7rst5LEL0XtSmrQU7IMPs/yJK7+nAhPKCaq+Us4pnyNyjFIZ9PNX9WG7XZvKMzdE6ATLZc20f4ctKejBm7wbOpaBPk5M6XfHqSC3sE61LRP6PIYDRVIlM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726842398; c=relaxed/simple; bh=TzJp4J2OqTXc4pPy+1Dt7yswjY+gxUBo9GvrpZd5LmE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Now7/z1w4RfiCxL2sMhYgOhA15Vg6MKx9+XCg02o2ASHlMrg9zq3J4/4/dAN2WqRHBlJA2yKkiMTXc8KGioyNh/0l87ghfkVVQgTRtA5vVmbxCKI13bEPnaJmxr2icZcDC6iNK4zw7y2BGabj/6+bq83Ly5wgCuObfyU9HYhXE0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f197.google.com with SMTP id e9e14a558f8ab-3a0cd7722f6so4236165ab.1 for ; Fri, 20 Sep 2024 07:26:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726842395; x=1727447195; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Ab9kvaGxjnKKrLV9AAejHQkW8vzpzTXyhKtnlcip2QE=; b=FRP2RsSpewviwv1q/A12mtKy8RbqY4HL11+RHEmjpou0msZ/MX5H2T5+A0I/yuEOeY uGTbz173srAjDoNWpNtCZA8pPliv4K210pPvyqKbWTOjcBzQk+cq50TPt3itI18Xr8gG Hhvi6QvsYtI5FKSjhm5Wq+UJM/7XHvGX1Rb2O8meKWU1Bw1alKENCVOiYxURrSoqhfQi nAxGOE2QOP9sWC5KGoztSGfKqFQ2n/0q2hDJNHQBQppeOYfVpraU9uPtNHUCtfR49sj0 ZBlzoB14DQ2hwtfDtS6W5EHijEm/Vhq8KQFbFld28Ok206lCEys0RrUDoScpfRaGcDKm CbFg== X-Forwarded-Encrypted: i=1; AJvYcCXrs9mLt7gjW9fOpRxLK8R7vmwx1HgxNfTaK2RfWYu4kZ/ElV19jNqztoNEgKbc4ZLk5jcPAwoVw6+bAjg=@vger.kernel.org X-Gm-Message-State: AOJu0YwsvrOErs/J81BFNkkj3Pzd0/ipsW7kLt4a696Ny4uXjndO3f6c fkkZ6BSj7o4+gWxJsFixnyaBuswXoYkwoDY6fSZmuLEnAJ9M7hNg39cseo0Whx/t3fpb/utQBxn R/0oObPJHWBlKhoFKqIKK8oy+B+2c8cdcNsi96N2n7LiC0xUo1c83JW0= X-Google-Smtp-Source: AGHT+IHeZofzFeA2g4M2K1ddfeOi0NFm7kVhTfhNxQYoMRGTJymSYqzhEPB6oWkM55b2i1u4g7yO64Z7PVjXdca1swJwrdwPhkaj Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a0e:b0:3a0:922f:8e9a with SMTP id e9e14a558f8ab-3a0c9d6f2ffmr30349625ab.17.1726842395072; Fri, 20 Sep 2024 07:26:35 -0700 (PDT) Date: Fri, 20 Sep 2024 07:26:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <66ed861b.050a0220.2abe4d.0016.GAE@google.com> Subject: [syzbot] [netfs?] KASAN: slab-use-after-free Read in iov_iter_revert From: syzbot To: dhowells@redhat.com, jlayton@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netfs@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a940d9a43e62 Merge tag 'soc-arm-6.12' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e1469f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=44d46e514184cd24 dashboard link: https://syzkaller.appspot.com/bug?extid=2625ce08c2659fb9961a compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1785b500580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=177244a9980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a940d9a4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e9929bfe422c/vmlinux-a940d9a4.xz kernel image: https://storage.googleapis.com/syzbot-assets/a6c74ee261ed/bzImage-a940d9a4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2625ce08c2659fb9961a@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in folioq_folio_order include/linux/folio_queue.h:140 [inline] BUG: KASAN: slab-use-after-free in folioq_folio_size include/linux/folio_queue.h:145 [inline] BUG: KASAN: slab-use-after-free in iov_iter_folioq_revert lib/iov_iter.c:597 [inline] BUG: KASAN: slab-use-after-free in iov_iter_revert lib/iov_iter.c:642 [inline] BUG: KASAN: slab-use-after-free in iov_iter_revert+0x503/0x5a0 lib/iov_iter.c:609 Read of size 1 at addr ffff888027bdfd1d by task kworker/u32:4/101 CPU: 1 UID: 0 PID: 101 Comm: kworker/u32:4 Not tainted 6.11.0-syzkaller-03917-ga940d9a43e62 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events_unbound netfs_write_collection_worker Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 folioq_folio_order include/linux/folio_queue.h:140 [inline] folioq_folio_size include/linux/folio_queue.h:145 [inline] iov_iter_folioq_revert lib/iov_iter.c:597 [inline] iov_iter_revert lib/iov_iter.c:642 [inline] iov_iter_revert+0x503/0x5a0 lib/iov_iter.c:609 netfs_retry_write_stream fs/netfs/write_collect.c:181 [inline] netfs_retry_writes fs/netfs/write_collect.c:361 [inline] netfs_collect_write_results fs/netfs/write_collect.c:529 [inline] netfs_write_collection_worker+0x44d2/0x4f80 fs/netfs/write_collect.c:551 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5341: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:690 [inline] netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25 netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421 netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2683 filemap_fdatawrite_wbc mm/filemap.c:397 [inline] filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387 __filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430 v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xaa3/0x2bb0 kernel/exit.c:882 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 get_signal+0x25fb/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 Freed by task 101: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2250 [inline] slab_free mm/slub.c:4474 [inline] kfree+0x12a/0x3b0 mm/slub.c:4595 netfs_delete_buffer_head+0xa6/0x100 fs/netfs/misc.c:59 netfs_writeback_unlock_folios fs/netfs/write_collect.c:139 [inline] netfs_collect_write_results fs/netfs/write_collect.c:493 [inline] netfs_write_collection_worker+0x20f9/0x4f80 fs/netfs/write_collect.c:551 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888027bdfc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 285 bytes inside of freed 512-byte region [ffff888027bdfc00, ffff888027bdfe00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27bdc head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff88801ac42c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff88801ac42c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000002 ffffea00009ef701 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 9199521764, free_ts 9199474394 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2319 allocate_slab mm/slub.c:2482 [inline] new_slab+0x84/0x260 mm/slub.c:2535 ___slab_alloc+0xdac/0x1870 mm/slub.c:3721 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3811 __slab_alloc_node mm/slub.c:3864 [inline] slab_alloc_node mm/slub.c:4026 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4185 kmalloc_noprof include/linux/slab.h:690 [inline] kzalloc_noprof include/linux/slab.h:816 [inline] device_private_init drivers/base/core.c:3527 [inline] device_add+0xccf/0x1a70 drivers/base/core.c:3578 device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4374 device_create+0xe9/0x130 drivers/base/core.c:4413 aoechr_init+0x116/0x1c0 drivers/block/aoe/aoechr.c:305 aoe_init+0x79/0x1f0 drivers/block/aoe/aoemain.c:54 do_one_initcall+0x128/0x700 init/main.c:1269 do_initcall_level init/main.c:1331 [inline] do_initcalls init/main.c:1347 [inline] do_basic_setup init/main.c:1366 [inline] kernel_init_freeable+0x69d/0xca0 init/main.c:1580 kernel_init+0x1c/0x2b0 init/main.c:1469 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2619 stack_depot_save_flags+0x2da/0x8f0 lib/stackdepot.c:666 kasan_save_stack+0x42/0x60 mm/kasan/common.c:48 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:690 [inline] kzalloc_noprof include/linux/slab.h:816 [inline] call_usermodehelper_setup+0x9a/0x340 kernel/umh.c:363 kobject_uevent_env+0x15ff/0x1860 lib/kobject_uevent.c:628 kset_register+0x1b6/0x2b0 lib/kobject.c:877 class_register+0x22e/0x340 drivers/base/class.c:203 aoechr_init+0xb0/0x1c0 drivers/block/aoe/aoechr.c:298 aoe_init+0x79/0x1f0 drivers/block/aoe/aoemain.c:54 do_one_initcall+0x128/0x700 init/main.c:1269 do_initcall_level init/main.c:1331 [inline] do_initcalls init/main.c:1347 [inline] do_basic_setup init/main.c:1366 [inline] kernel_init_freeable+0x69d/0xca0 init/main.c:1580 kernel_init+0x1c/0x2b0 init/main.c:1469 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888027bdfc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027bdfc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027bdfd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027bdfd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027bdfe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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 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