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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1c82:b0:3a3:b1dd:c30b with SMTP id e9e14a558f8ab-3a3b5fb651bmr10837505ab.18.1728621625161; Thu, 10 Oct 2024 21:40:25 -0700 (PDT) Date: Thu, 10 Oct 2024 21:40:25 -0700 In-Reply-To: <000000000000c7e54f0621e8a14f@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6708ac39.050a0220.3e960.000b.GAE@google.com> Subject: Re: [syzbot] [ocfs2?] KASAN: slab-use-after-free Read in ocfs2_fault From: syzbot To: 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" syzbot has found a reproducer for the following issue on: HEAD commit: 2d8bce6e34be KVM: arm64: Shave a few bytes from the EL2 id.. 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=145a1fd0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b9f31443a725c681 dashboard link: https://syzkaller.appspot.com/bug?extid=a49010a0e8fcdeea075f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13ed405f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=139cab27980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8b2745aa8707/disk-2d8bce6e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c62ee63d102f/vmlinux-2d8bce6e.xz kernel image: https://storage.googleapis.com/syzbot-assets/d3b601037e8f/Image-2d8bce6e.gz.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/f3b54e377488/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/24fadc57f66d/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a49010a0e8fcdeea075f@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xe0/0x49c fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff0000cf14e938 by task syz-executor309/8708 CPU: 1 UID: 0 PID: 8708 Comm: syz-executor309 Not tainted 6.12.0-rc1-syzkaller-g2d8bce6e34be #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326 __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 ocfs2_fault+0xe0/0x49c fs/ocfs2/mmap.c:41 __do_fault+0x11c/0x374 mm/memory.c:4876 do_shared_fault mm/memory.c:5346 [inline] do_fault mm/memory.c:5420 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault mm/memory.c:5751 [inline] __handle_mm_fault+0x1d30/0x66c0 mm/memory.c:5894 handle_mm_fault+0x29c/0x8b4 mm/memory.c:6062 do_page_fault+0x570/0x10a8 arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x60/0xbc arch/arm64/kernel/entry-common.c:501 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:593 __arch_copy_to_user+0x190/0x234 arch/arm64/lib/copy_template.S:158 copy_page_to_iter+0x204/0x2fc lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:189 [inline] filemap_read+0x6c0/0xc84 mm/filemap.c:2696 generic_file_read_iter+0x9c/0x34c mm/filemap.c:2833 ocfs2_file_read_iter+0x408/0xbd4 fs/ocfs2/file.c:2574 do_iter_readv_writev+0x490/0x6d4 vfs_readv+0x238/0x844 fs/read_write.c:1025 do_preadv fs/read_write.c:1142 [inline] __do_sys_preadv fs/read_write.c:1192 [inline] __se_sys_preadv fs/read_write.c:1187 [inline] __arm64_sys_preadv+0x18c/0x29c fs/read_write.c:1187 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:732 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:750 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Allocated by task 8719: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_noprof+0x1c0/0x354 mm/slub.c:4142 vm_area_alloc+0x30/0x1bc kernel/fork.c:472 mmap_region+0xccc/0x1e28 mm/mmap.c:1424 do_mmap+0x7e0/0xe00 mm/mmap.c:496 vm_mmap_pgoff+0x1a0/0x38c mm/util.c:588 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:732 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:750 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 8710: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kmem_cache_free+0x19c/0x560 mm/slub.c:4682 __vm_area_free+0xfc/0x148 kernel/fork.c:515 vm_area_free_rcu_cb+0x80/0xa4 kernel/fork.c:526 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x898/0x1b5c kernel/rcu/tree.c:2823 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2840 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:541 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:551 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x104/0xb00 kernel/rcu/tree.c:3190 vm_area_free+0x28/0x38 kernel/fork.c:533 remove_vma mm/vma.c:337 [inline] vms_complete_munmap_vmas+0x5c4/0x840 mm/vma.c:1156 mmap_region+0xc68/0x1e28 mm/mmap.c:1533 do_mmap+0x7e0/0xe00 mm/mmap.c:496 vm_mmap_pgoff+0x1a0/0x38c mm/util.c:588 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:732 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:750 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000cf14e8b8 which belongs to the cache vm_area_struct of size 184 The buggy address is located 128 bytes inside of freed 184-byte region [ffff0000cf14e8b8, ffff0000cf14e970) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f14e ksm flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c182eb40 fffffdffc3620bc0 dead000000000007 raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cf14e800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff0000cf14e880: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb >ffff0000cf14e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff0000cf14e980: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb ffff0000cf14ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ================================================================== --- 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.