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ca18e2360f4ac-834f7d62631mr1471835839f.11.1728335701913; Mon, 07 Oct 2024 14:15:01 -0700 (PDT) Date: Mon, 07 Oct 2024 14:15:01 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67044f55.050a0220.20acde.1ecd.GAE@google.com> Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Write in sco_sock_timeout From: syzbot To: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, 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 Write in sco_sock_timeout ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:184 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:241 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:258 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:781 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0xa2/0x2d0 net/bluetooth/sco.c:140 Write of size 4 at addr ffff888140eac080 by task kworker/0:2/921 CPU: 0 UID: 0 PID: 921 Comm: kworker/0:2 Not tainted 6.12.0-rc2-syzkaller-g87d6aab2389e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:184 [inline] __refcount_inc include/linux/refcount.h:241 [inline] refcount_inc include/linux/refcount.h:258 [inline] sock_hold include/net/sock.h:781 [inline] sco_sock_timeout+0xa2/0x2d0 net/bluetooth/sco.c:140 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5764: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2164 sk_alloc+0x38/0x370 net/core/sock.c:2217 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:543 [inline] sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:574 bt_sock_create+0x163/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x492/0x920 net/socket.c:1576 sock_create net/socket.c:1627 [inline] __sys_socket_create net/socket.c:1664 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1711 __do_sys_socket net/socket.c:1725 [inline] __se_sys_socket net/socket.c:1723 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1723 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5765: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x1a0/0x440 mm/slub.c:4727 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2292 sco_sock_release+0x25e/0x320 net/bluetooth/sco.c:1302 __sock_release net/socket.c:658 [inline] sock_close+0xbe/0x240 net/socket.c:1426 __fput+0x241/0x880 fs/file_table.c:431 task_work_run+0x251/0x310 kernel/task_work.c:228 get_signal+0x15e8/0x1740 kernel/signal.c:2690 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888140eac000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff888140eac000, ffff888140eac800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888140eab000 pfn:0x140ea8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000240 ffff888015442000 ffffea000515b410 ffffea000510e610 raw: ffff888140eab000 0000000000080006 00000001f5000000 0000000000000000 head: 057ff00000000240 ffff888015442000 ffffea000515b410 ffffea000510e610 head: ffff888140eab000 0000000000080006 00000001f5000000 0000000000000000 head: 057ff00000000003 ffffea000503aa01 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 1, tgid 1 (swapper/0), ts 2263006817, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2412 allocate_slab+0x5a/0x2f0 mm/slub.c:2578 new_slab mm/slub.c:2631 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 __slab_alloc+0x58/0xa0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] acpi_ds_create_walk_state+0x103/0x2a0 drivers/acpi/acpica/dswstate.c:518 acpi_ds_auto_serialize_method+0xe7/0x240 drivers/acpi/acpica/dsmethod.c:81 acpi_ds_init_one_object+0x1bb/0x370 drivers/acpi/acpica/dsinit.c:110 acpi_ns_walk_namespace+0x296/0x4f0 acpi_ds_initialize_objects+0x199/0x2b0 drivers/acpi/acpica/dsinit.c:189 acpi_ns_load_table+0xfd/0x120 drivers/acpi/acpica/nsload.c:106 acpi_tb_load_namespace+0x291/0x6d0 drivers/acpi/acpica/tbxfload.c:158 page_owner free stack trace missing Memory state around the buggy address: ffff888140eabf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888140eac000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888140eac080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888140eac100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888140eac180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Tested on: commit: 87d6aab2 Merge tag 'for_linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=101aa707980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a5119ec8290b5433 dashboard link: https://syzkaller.appspot.com/bug?extid=4c0d0c4cde787116d465 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=124a3b80580000