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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 6B144C4646A for ; Wed, 12 Sep 2018 01:13:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 250FC20882 for ; Wed, 12 Sep 2018 01:13:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 250FC20882 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by 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X-Gm-Message-State: APzg51AlqQZd/Go5jodxlABAsObdWOz8FcbwPMJErq1Y3G0feWsw19o2 sK6DLxpo4PQvZTH9RsCFbydmhcJyeB7kNEiDUfX5N/k9IlSa X-Google-Smtp-Source: ANB0Vda4ekfhCdE6l0d5DoFA0H37X7CNn3F6k5LDvVE4SZkn/n0JlP1P3OTF9WJDDz0LtLVIODhG4N/mYASwDKcWyX1EkeRQSnlL MIME-Version: 1.0 X-Received: by 2002:a24:364e:: with SMTP id l75-v6mr3659005itl.46.1536714782670; Tue, 11 Sep 2018 18:13:02 -0700 (PDT) Date: Tue, 11 Sep 2018 18:13:02 -0700 In-Reply-To: <000000000000fca96a057543ecea@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000be0a7a0575a24a7b@google.com> Subject: Re: KASAN: use-after-free Read in cma_bind_port From: syzbot To: danielj@mellanox.com, dledford@redhat.com, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, parav@mellanox.com, swise@opengridcomputing.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 syzbot has found a reproducer for the following crash on: HEAD commit: 11da3a7f84f1 Linux 4.19-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11766c69400000 kernel config: https://syzkaller.appspot.com/x/.config?x=9917ff4b798e1a1e dashboard link: https://syzkaller.appspot.com/bug?extid=da2591e115d57a9cbb8b compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1686969e400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+da2591e115d57a9cbb8b@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 hrtimer: interrupt took 34369 ns ================================================================== BUG: KASAN: use-after-free in cma_bind_port+0x35d/0x420 drivers/infiniband/core/cma.c:3059 Read of size 2 at addr ffff8801b7b056a0 by task syz-executor3/7271 CPU: 1 PID: 7271 Comm: syz-executor3 Not tainted 4.19.0-rc3+ #231 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431 cma_bind_port+0x35d/0x420 drivers/infiniband/core/cma.c:3059 cma_alloc_port+0x115/0x180 drivers/infiniband/core/cma.c:3095 cma_alloc_any_port drivers/infiniband/core/cma.c:3160 [inline] cma_get_port drivers/infiniband/core/cma.c:3314 [inline] rdma_bind_addr+0x1765/0x23d0 drivers/infiniband/core/cma.c:3434 cma_bind_addr drivers/infiniband/core/cma.c:2963 [inline] rdma_resolve_addr+0x4e2/0x2770 drivers/infiniband/core/cma.c:2974 ucma_resolve_ip+0x242/0x2a0 drivers/infiniband/core/ucma.c:711 ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 __vfs_write+0x119/0x9f0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4572d9 Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f71074b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f71074b16d4 RCX: 00000000004572d9 RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000008 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d83c0 R14: 00000000004c1e90 R15: 0000000000000000 Allocated by task 7285: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] __rdma_create_id+0xdf/0x790 drivers/infiniband/core/cma.c:782 ucma_create_id+0x39b/0x990 drivers/infiniband/core/ucma.c:502 ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 __vfs_write+0x119/0x9f0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7261: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 rdma_destroy_id+0x835/0xcc0 drivers/infiniband/core/cma.c:1737 ucma_close+0x100/0x300 drivers/infiniband/core/ucma.c:1759 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801b7b05680 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 32 bytes inside of 2048-byte region [ffff8801b7b05680, ffff8801b7b05e80) The buggy address belongs to the page: page:ffffea0006dec100 count:1 mapcount:0 mapping:ffff8801da800c40 index:0xffff8801b7b04580 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006debf88 ffffea0006deb708 ffff8801da800c40 raw: ffff8801b7b04580 ffff8801b7b04580 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b7b05580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b7b05600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801b7b05680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b7b05700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b7b05780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================