From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,HEXHASH_WORD,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21722C48BD9 for ; Thu, 27 Jun 2019 06:50:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00080205C9 for ; Thu, 27 Jun 2019 06:50:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726502AbfF0GuJ (ORCPT ); Thu, 27 Jun 2019 02:50:09 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:52452 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726054AbfF0GuH (ORCPT ); Thu, 27 Jun 2019 02:50:07 -0400 Received: by mail-io1-f70.google.com with SMTP id p12so1471675iog.19 for ; Wed, 26 Jun 2019 23:50:07 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=xEliJdK9M3/w6rIbLzit+wZM9b/EZDWvsE/5TUp3ZSw=; b=k0Mi13ouMgNKAGlOAH+j6A/z5WanxiiVy+SDLq7IhF1vd/9u5uTYcyP6cLTF8EaMb3 c0LKKkXGgDVYyQagr+dqqKQnRKK/3h0yV3wTXSc0Ck6N2vqrDdm2kkUFRnlM6ppUfu1J BXi7Nx06aFI1Sdi5zJlv6yVSHCdgi5V8WDmdueiEXv8uguJlop4L7OPItb9whWkJrfj7 AfJrOHOmt8SUO7EgPf+dNGoPhwi0Szq85YJJKHX1579SypnMaw+NNqIRRk1luAfya4Za Ud36kCk0GcEl5qgJhCJHxz8xY0kJT//nmcvfSFPaMlEe9Qjsbn86LpEkles938M1m5qH O+gQ== X-Gm-Message-State: APjAAAX5MsEOInmFELo9qMl7y+XNJaH+pBSoYEsvkRqCTHgUi8+5m8JQ nWX0Pgv8OBoQ35shrEQajSnbP4nRtR6ibuYxZ9wKErx4w1ko X-Google-Smtp-Source: APXvYqxz8XXM3GckL+zjAINTnXDWdnY/BTxiabDh+wfVTjxIvNF+aaEw1qAj7GXamGAv60IJO+9OCmU8R5xhMLsnZKcwnwC6u2em MIME-Version: 1.0 X-Received: by 2002:a6b:6b0d:: with SMTP id g13mr2810486ioc.55.1561618206772; Wed, 26 Jun 2019 23:50:06 -0700 (PDT) Date: Wed, 26 Jun 2019 23:50:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007d52ea058c489235@google.com> Subject: KASAN: use-after-free Write in xfrm_policy_flush From: syzbot To: davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 249155c2 Merge branch 'parisc-5.2-4' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10f1198da00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a31528e58cc12e2 dashboard link: https://syzkaller.appspot.com/bug?extid=2daeb7ae5e8245095f65 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2daeb7ae5e8245095f65@syzkaller.appspotmail.com netlink: 168 bytes leftover after parsing attributes in process `syz-executor.2'. ================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:221 [inline] BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:748 [inline] BUG: KASAN: use-after-free in hlist_del_rcu include/linux/rculist.h:455 [inline] BUG: KASAN: use-after-free in __xfrm_policy_unlink net/xfrm/xfrm_policy.c:2217 [inline] BUG: KASAN: use-after-free in xfrm_policy_flush+0x3be/0x900 net/xfrm/xfrm_policy.c:1794 Write of size 8 at addr ffff8880a5cfdd00 by task syz-executor.2/31717 CPU: 0 PID: 31717 Comm: syz-executor.2 Not tainted 5.2.0-rc6+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113 print_address_description+0x6d/0x310 mm/kasan/report.c:188 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:317 kasan_report+0x26/0x50 mm/kasan/common.c:614 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137 __write_once_size include/linux/compiler.h:221 [inline] __hlist_del include/linux/list.h:748 [inline] hlist_del_rcu include/linux/rculist.h:455 [inline] __xfrm_policy_unlink net/xfrm/xfrm_policy.c:2217 [inline] xfrm_policy_flush+0x3be/0x900 net/xfrm/xfrm_policy.c:1794 xfrm_flush_policy+0x132/0x3c0 net/xfrm/xfrm_user.c:2123 xfrm_user_rcv_msg+0x46b/0x720 net/xfrm/xfrm_user.c:2657 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2482 xfrm_netlink_rcv+0x74/0x90 net/xfrm/xfrm_user.c:2665 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x962/0xaf0 net/netlink/af_netlink.c:1333 netlink_sendmsg+0xa7a/0xd40 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg net/socket.c:665 [inline] ___sys_sendmsg+0x66b/0x9a0 net/socket.c:2286 __sys_sendmsg net/socket.c:2324 [inline] __do_sys_sendmsg net/socket.c:2333 [inline] __se_sys_sendmsg net/socket.c:2331 [inline] __x64_sys_sendmsg+0x1cf/0x290 net/socket.c:2331 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4e7b5f5c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519 RDX: 0000000000000000 RSI: 000000002014f000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4e7b5f66d4 R13: 00000000004c7264 R14: 00000000004dc6c8 R15: 00000000ffffffff Allocated by task 8433: save_stack mm/kasan/common.c:71 [inline] set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:489 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc mm/slab.c:3660 [inline] __kmalloc+0x23c/0x310 mm/slab.c:3669 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:742 [inline] xfrm_hash_alloc+0x38/0xe0 net/xfrm/xfrm_hash.c:21 xfrm_policy_init net/xfrm/xfrm_policy.c:4036 [inline] xfrm_net_init+0x269/0xd60 net/xfrm/xfrm_policy.c:4120 ops_init+0x336/0x420 net/core/net_namespace.c:130 setup_net+0x212/0x690 net/core/net_namespace.c:316 copy_net_ns+0x224/0x380 net/core/net_namespace.c:439 create_new_namespaces+0x4ec/0x700 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0x12a/0x190 kernel/nsproxy.c:202 ksys_unshare+0x540/0xac0 kernel/fork.c:2692 __do_sys_unshare kernel/fork.c:2760 [inline] __se_sys_unshare kernel/fork.c:2758 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:2758 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21222: save_stack mm/kasan/common.c:71 [inline] set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xae/0x120 mm/slab.c:3755 xfrm_hash_free+0x38/0xd0 net/xfrm/xfrm_hash.c:35 xfrm_bydst_resize net/xfrm/xfrm_policy.c:602 [inline] xfrm_hash_resize+0x13f1/0x1840 net/xfrm/xfrm_policy.c:680 process_one_work+0x814/0x1130 kernel/workqueue.c:2269 worker_thread+0xc01/0x1640 kernel/workqueue.c:2415 kthread+0x325/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a5cfdd00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880a5cfdd00, ffff8880a5cfdd40) The buggy address belongs to the page: page:ffffea0002973f40 refcount:1 mapcount:0 mapping:ffff8880aa400340 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000267ccc8 ffffea0002a49b08 ffff8880aa400340 raw: 0000000000000000 ffff8880a5cfd000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a5cfdc00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a5cfdc80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc > ffff8880a5cfdd00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880a5cfdd80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a5cfde00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ================================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.