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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:160c:b0:3ce:88b1:7f21 with SMTP id e9e14a558f8ab-3cf7449070emr29027315ab.15.1737133885397; Fri, 17 Jan 2025 09:11:25 -0800 (PST) Date: Fri, 17 Jan 2025 09:11:25 -0800 In-Reply-To: <000000000000a4a7550611e234f5@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <678a8f3d.050a0220.303755.000f.GAE@google.com> Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Read in handle_tx (2) From: syzbot To: andrew+netdev@lunn.ch, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 9bffa1ad25b8 Merge tag 'drm-fixes-2025-01-17' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=107a69df980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1cb4a1f148c0861 dashboard link: https://syzkaller.appspot.com/bug?extid=827272712bd6d12c79a4 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=15783a18580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d6c2b0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9bffa1ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0c65d8091a25/vmlinux-9bffa1ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/1d98f79a18b7/bzImage-9bffa1ad.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+827272712bd6d12c79a4@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in handle_tx+0x5a5/0x630 drivers/net/caif/caif_serial.c:236 Read of size 8 at addr ffff888027ef3020 by task aoe_tx0/1417 CPU: 3 UID: 0 PID: 1417 Comm: aoe_tx0 Not tainted 6.13.0-rc7-syzkaller-00149-g9bffa1ad25b8 #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+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 handle_tx+0x5a5/0x630 drivers/net/caif/caif_serial.c:236 __netdev_start_xmit include/linux/netdevice.h:5002 [inline] netdev_start_xmit include/linux/netdevice.h:5011 [inline] xmit_one net/core/dev.c:3620 [inline] dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3636 __dev_queue_xmit+0x7f0/0x43e0 net/core/dev.c:4466 dev_queue_xmit include/linux/netdevice.h:3168 [inline] tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62 kthread+0x1e7/0x3c0 drivers/block/aoe/aoecmd.c:1237 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 9336: 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:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] alloc_tty_struct+0x98/0x8d0 drivers/tty/tty_io.c:3116 tty_init_dev.part.0+0x1e/0x660 drivers/tty/tty_io.c:1409 tty_init_dev include/linux/err.h:67 [inline] tty_open_by_driver drivers/tty/tty_io.c:2082 [inline] tty_open+0xac1/0xf80 drivers/tty/tty_io.c:2129 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0xf59/0x1ea0 fs/open.c:945 vfs_open+0x82/0x3f0 fs/open.c:1075 do_open fs/namei.c:3828 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 3233: 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:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 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 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:544 insert_work+0x36/0x230 kernel/workqueue.c:2183 __queue_work+0x97e/0x1080 kernel/workqueue.c:2339 queue_work_on+0x11a/0x140 kernel/workqueue.c:2390 kref_put include/linux/kref.h:65 [inline] tty_kref_put drivers/tty/tty_io.c:1566 [inline] tty_kref_put drivers/tty/tty_io.c:1563 [inline] release_tty+0x4de/0x5d0 drivers/tty/tty_io.c:1602 tty_release_struct+0xb7/0xe0 drivers/tty/tty_io.c:1701 tty_release+0xe25/0x1410 drivers/tty/tty_io.c:1861 __fput+0x3f8/0xb60 fs/file_table.c:450 __fput_sync+0xa1/0xc0 fs/file_table.c:535 __do_sys_close fs/open.c:1554 [inline] __se_sys_close fs/open.c:1539 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1539 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888027ef3000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 32 bytes inside of freed 2048-byte region [ffff888027ef3000, ffff888027ef3800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27ef0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802da23f81 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b050140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000001f5000000 ffff88802da23f81 head: 00fff00000000040 ffff88801b050140 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000001f5000000 ffff88802da23f81 head: 00fff00000000003 ffffea00009fbc01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5950, tgid 5950 (syz-executor374), ts 92233424258, free_ts 92129665975 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c8/0x620 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xd7d/0x17a0 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_noprof+0x2f0/0x510 mm/slub.c:4304 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:645 kvmalloc_array_node_noprof include/linux/slab.h:1063 [inline] alloc_fdtable+0xee/0x2b0 fs/file.c:199 dup_fd+0x83b/0xb90 fs/file.c:400 copy_files kernel/fork.c:1797 [inline] copy_process+0x25d2/0x8e50 kernel/fork.c:2382 kernel_clone+0xfd/0x960 kernel/fork.c:2806 __do_sys_clone+0xba/0x100 kernel/fork.c:2949 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6083 tgid 6083 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 __put_partials+0x14c/0x170 mm/slub.c:3157 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4175 getname_flags.part.0+0x4c/0x550 fs/namei.c:139 getname_flags include/linux/audit.h:322 [inline] getname+0x8d/0xe0 fs/namei.c:223 getname_maybe_null include/linux/fs.h:2796 [inline] vfs_fstatat+0xdf/0xf0 fs/stat.c:361 __do_sys_newfstatat+0xa2/0x130 fs/stat.c:530 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888027ef2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027ef2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888027ef3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027ef3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027ef3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.