From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751123AbeCZDnD (ORCPT ); Sun, 25 Mar 2018 23:43:03 -0400 Received: from mail-it0-f71.google.com ([209.85.214.71]:42844 "EHLO mail-it0-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750999AbeCZDnC (ORCPT ); Sun, 25 Mar 2018 23:43:02 -0400 X-Google-Smtp-Source: AG47ELtKFKrJoR4UJokD7dZI3Vqdq+E/97kZbQrE/P26gtydxn46ayTQtrkNz6TCEAvcITeF+kEKggmoG0fG7ARJq4PBrrsakyME MIME-Version: 1.0 Date: Sun, 25 Mar 2018 20:43:01 -0700 In-Reply-To: <001a1141551246502d056845782e@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <001a1140f6ac1677460568489287@google.com> Subject: Re: KASAN: use-after-free Read in __list_del_entry_valid (4) From: syzbot To: dasaratharaman.chandramouli@intel.com, dledford@redhat.com, jgg@ziepe.ca, leonro@mellanox.com, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, markb@mellanox.com, monis@mellanox.com, parav@mellanox.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found reproducer for the following crash on upstream commit 3eb2ce825ea1ad89d20f7a3b5780df850e4be274 (Sun Mar 25 22:44:30 2018 +0000) Linux 4.16-rc7 syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=29ee8f76017ce6cf03da So far this crash happened 4 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4763014771245056 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5870647779524608 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=4652258302099456 Kernel config: https://syzkaller.appspot.com/x/.config?id=-2340295454854568752 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+29ee8f76017ce6cf03da@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready 8021q: adding VLAN 0 to HW filter on device bond0 IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x144/0x150 lib/list_debug.c:54 Read of size 8 at addr ffff8801b6022fa0 by task syzkaller871713/4346 CPU: 1 PID: 4346 Comm: syzkaller871713 Not tainted 4.16.0-rc7+ #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0x144/0x150 lib/list_debug.c:54 __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] cma_cancel_listens drivers/infiniband/core/cma.c:1569 [inline] cma_cancel_operation+0x455/0xd60 drivers/infiniband/core/cma.c:1597 rdma_destroy_id+0xff/0xda0 drivers/infiniband/core/cma.c:1661 ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1728 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x447529 RSP: 002b:00007f782c2b0cf8 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00000000006ddc5c RCX: 0000000000447529 RDX: 0000000000447529 RSI: 0000000000000001 RDI: 00000000006ddc5c RBP: 00000000006ddc58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007fff8bb3d8cf R14: 00007f782c2b19c0 R15: 0000000000000005 Allocated by task 4343: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3607 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] rdma_create_id+0xd0/0x630 drivers/infiniband/core/cma.c:787 ucma_create_id+0x35f/0x920 drivers/infiniband/core/ucma.c:480 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4346: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kfree+0xd9/0x260 mm/slab.c:3800 rdma_destroy_id+0x821/0xda0 drivers/infiniband/core/cma.c:1691 ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1728 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801b6022dc0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 480 bytes inside of 1024-byte region [ffff8801b6022dc0, ffff8801b60231c0) The buggy address belongs to the page: page:ffffea0006d80880 count:1 mapcount:0 mapping:ffff8801b6022040 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801b6022040 0000000000000000 0000000100000007 raw: ffffea0006dca520 ffffea0006d88720 ffff8801dac00ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b6022e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b6022f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801b6022f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b6023000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b6023080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================