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Mon, 29 Mar 2021 08:43:24 -0700 (PDT) Date: Mon, 29 Mar 2021 08:43:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f8e51405beaebdde@google.com> Subject: [syzbot] KASAN: use-after-free Read in nfc_llcp_sock_unlink From: syzbot To: akpm@linux-foundation.org, bp@alien8.de, davem@davemloft.net, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kuba@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, masahiroy@kernel.org, mingo@redhat.com, netdev@vger.kernel.org, pbonzini@redhat.com, peterz@infradead.org, rafael.j.wysocki@intel.com, rostedt@goodmis.org, seanjc@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, will@kernel.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 75887e88 Merge branch '40GbE' of git://git.kernel.org/pub/.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=12d6bb06d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5adab0bdee099d7a dashboard link: https://syzkaller.appspot.com/bug?extid=8b7c5fc0cfb74afee8d1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15c2db21d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1091d4bed00000 The issue was bisected to: commit 997acaf6b4b59c6a9c259740312a69ea549cc684 Author: Mark Rutland Date: Mon Jan 11 15:37:07 2021 +0000 lockdep: report broken irq restoration bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12636d06d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11636d06d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=16636d06d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8b7c5fc0cfb74afee8d1@syzkaller.appspotmail.com Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration") ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 Read of size 8 at addr ffff888144614468 by task syz-executor242/8422 CPU: 0 PID: 8422 Comm: syz-executor242 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475 __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] _raw_write_lock+0x2a/0x40 kernel/locking/spinlock.c:295 nfc_llcp_sock_unlink+0x1d/0x1c0 net/nfc/llcp_core.c:32 llcp_sock_release+0x286/0x580 net/nfc/llcp_sock.c:640 __sock_release+0xcd/0x280 net/socket.c:599 sock_close+0x18/0x20 net/socket.c:1258 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xbfc/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43db99 Code: Unable to access opcode bytes at RIP 0x43db6f. RSP: 002b:00007ffdd4d753e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043db99 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488 R10: 0000000000400488 R11: 0000000000000246 R12: 00000000004ae230 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] nfc_llcp_register_device+0x45/0x9d0 net/nfc/llcp_core.c:1572 nfc_register_device+0x6d/0x360 net/nfc/core.c:1124 nfcsim_device_new+0x345/0x5c1 drivers/nfc/nfcsim.c:408 nfcsim_init+0x71/0x14d drivers/nfc/nfcsim.c:455 do_one_initcall+0x103/0x650 init/main.c:1226 do_initcall_level init/main.c:1299 [inline] do_initcalls init/main.c:1315 [inline] do_basic_setup init/main.c:1335 [inline] kernel_init_freeable+0x63e/0x6c2 init/main.c:1537 kernel_init+0xd/0x1b8 init/main.c:1424 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 8422: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4213 local_release net/nfc/llcp_core.c:175 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:183 [inline] nfc_llcp_local_put+0x194/0x200 net/nfc/llcp_core.c:178 llcp_sock_destruct+0x81/0x150 net/nfc/llcp_sock.c:950 __sk_destruct+0x4b/0x900 net/core/sock.c:1795 sk_destruct+0xbd/0xe0 net/core/sock.c:1839 __sk_free+0xef/0x3d0 net/core/sock.c:1850 sk_free+0x78/0xa0 net/core/sock.c:1861 sock_put include/net/sock.h:1803 [inline] llcp_sock_release+0x3c9/0x580 net/nfc/llcp_sock.c:644 __sock_release+0xcd/0x280 net/socket.c:599 sock_close+0x18/0x20 net/socket.c:1258 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xbfc/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888144614000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1128 bytes inside of 2048-byte region [ffff888144614000, ffff888144614800) The buggy address belongs to the page: page:ffffea0005118400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888144616000 pfn:0x144610 head:ffffea0005118400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head) raw: 057ff00000010200 ffffea00050f2008 ffffea00050f1e08 ffff888010842000 raw: ffff888144616000 0000000000080006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888144614300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888144614380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888144614400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888144614480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888144614500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches