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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1846:b0:39d:2ced:e3ee with SMTP id e9e14a558f8ab-3a04f070e0emr98421355ab.8.1725801003228; Sun, 08 Sep 2024 06:10:03 -0700 (PDT) Date: Sun, 08 Sep 2024 06:10:03 -0700 In-Reply-To: <20240908125017.2529-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c0339406219b5b0d@google.com> Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in l2cap_connect (2) From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-use-after-free Read in l2cap_recv_acldata ================================================================== BUG: KASAN: slab-use-after-free in l2cap_recv_acldata+0xa0b/0xb70 net/bluetooth/l2cap_core.c:7480 Read of size 8 at addr ffff888031b08fe8 by task kworker/u9:8/7223 CPU: 0 UID: 0 PID: 7223 Comm: kworker/u9:8 Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci0 hci_rx_work 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 l2cap_recv_acldata+0xa0b/0xb70 net/bluetooth/l2cap_core.c:7480 hci_acldata_packet net/bluetooth/hci_core.c:3792 [inline] hci_rx_work+0xac0/0x1630 net/bluetooth/hci_core.c:4030 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 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 6015: 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:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] __hci_conn_add+0x131/0x1a50 net/bluetooth/hci_conn.c:934 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1043 hci_conn_request_evt+0x8c4/0xb40 net/bluetooth/hci_event.c:3288 hci_event_func net/bluetooth/hci_event.c:7446 [inline] hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7498 hci_rx_work+0x2c6/0x1630 net/bluetooth/hci_core.c:4025 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 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 Freed by task 6017: 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:2256 [inline] slab_free mm/slub.c:4477 [inline] kfree+0x12a/0x3b0 mm/slub.c:4598 device_release+0xa1/0x240 drivers/base/core.c:2582 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e4/0x5a0 lib/kobject.c:737 put_device drivers/base/core.c:3790 [inline] device_unregister+0x2f/0xc0 drivers/base/core.c:3913 hci_conn_del_sysfs+0xb4/0x180 net/bluetooth/hci_sysfs.c:86 hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline] hci_conn_del+0x54e/0xdb0 net/bluetooth/hci_conn.c:1162 hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5583 abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2917 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:328 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 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 ffff888031b08000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4072 bytes inside of freed 8192-byte region [ffff888031b08000, ffff888031b0a000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888031b0c000 pfn:0x31b08 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff88801ac42280 ffffea0001f09000 0000000000000003 raw: ffff888031b0c000 0000000000020001 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff88801ac42280 ffffea0001f09000 0000000000000003 head: ffff888031b0c000 0000000000020001 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0000c6c201 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6015, tgid 6015 (kworker/u9:6), ts 133220298161, free_ts 131544899649 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:2325 allocate_slab mm/slub.c:2488 [inline] new_slab+0x84/0x260 mm/slub.c:2541 ___slab_alloc+0xdac/0x1870 mm/slub.c:3727 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3817 __slab_alloc_node mm/slub.c:3870 [inline] slab_alloc_node mm/slub.c:4029 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4188 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] __hci_conn_add+0x131/0x1a50 net/bluetooth/hci_conn.c:934 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1043 hci_conn_request_evt+0x8c4/0xb40 net/bluetooth/hci_event.c:3288 hci_event_func net/bluetooth/hci_event.c:7446 [inline] hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7498 hci_rx_work+0x2c6/0x1630 net/bluetooth/hci_core.c:4025 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 page last free pid 5957 tgid 5957 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 __put_partials+0x14c/0x170 mm/slub.c:3055 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3992 [inline] slab_alloc_node mm/slub.c:4041 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4048 ptlock_alloc mm/memory.c:6589 [inline] ptlock_init include/linux/mm.h:2944 [inline] pmd_ptlock_init include/linux/mm.h:3048 [inline] pagetable_pmd_ctor include/linux/mm.h:3086 [inline] pmd_alloc_one_noprof include/asm-generic/pgalloc.h:141 [inline] __pmd_alloc+0xc3/0x820 mm/memory.c:6079 pmd_alloc include/linux/mm.h:2835 [inline] alloc_new_pmd mm/mremap.c:96 [inline] move_page_tables+0x2218/0x3780 mm/mremap.c:608 shift_arg_pages+0x1eb/0x410 fs/exec.c:758 setup_arg_pages+0x516/0xc70 fs/exec.c:880 load_elf_binary+0xa66/0x4d90 fs/binfmt_elf.c:1014 search_binary_handler fs/exec.c:1827 [inline] exec_binprm fs/exec.c:1869 [inline] bprm_execve fs/exec.c:1920 [inline] bprm_execve+0x703/0x1960 fs/exec.c:1896 do_execveat_common.isra.0+0x4f1/0x630 fs/exec.c:2027 do_execve fs/exec.c:2101 [inline] __do_sys_execve fs/exec.c:2177 [inline] __se_sys_execve fs/exec.c:2172 [inline] __x64_sys_execve+0x8c/0xb0 fs/exec.c:2172 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: ffff888031b08e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031b08f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888031b08f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888031b09000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031b09080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Tested on: commit: d1f2d51b Merge tag 'clk-fixes-for-linus' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14151f29980000 kernel config: https://syzkaller.appspot.com/x/.config?x=57042fe37c7ee7c2 dashboard link: https://syzkaller.appspot.com/bug?extid=c12e2f941af1feb5632c compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=15449ffb980000