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 383F9C433F5 for ; Fri, 7 Sep 2018 08:01:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E3FEA206BB for ; Fri, 7 Sep 2018 08:01:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E3FEA206BB 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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APzg51AHRixvEhsMKOEnPH4Ref2QX3+2T9jracGTxYlrG4mWujaB5oeL yt27j5oBD2ZmfEFBU+ScfSiAUfackUXYOSrBddkjoNmNps2u X-Google-Smtp-Source: ANB0VdaoTbqDHtdsgs5kj3Kdi982SlSATL+9XI/QVETRdgaa0tbAflW/ZmGHieNTK38XSCsW72xtxKf6ZMI7CB25u5V0CZak22v9 MIME-Version: 1.0 X-Received: by 2002:a24:9f84:: with SMTP id c126-v6mr5753623ite.29.1536307263273; Fri, 07 Sep 2018 01:01:03 -0700 (PDT) Date: Fri, 07 Sep 2018 01:01:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b18a4605754368bd@google.com> Subject: KASAN: use-after-free Write in ucma_put_ctx From: syzbot To: dledford@redhat.com, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, parav@mellanox.com, roland@purestorage.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 Hello, syzbot found the following crash on: HEAD commit: b36fdc6853a3 Merge tag 'gpio-v4.19-2' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16a18421400000 kernel config: https://syzkaller.appspot.com/x/.config?x=6c9564cd177daf0c dashboard link: https://syzkaller.appspot.com/bug?extid=cfe3c1e8ef634ba8964b compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154f2056400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+cfe3c1e8ef634ba8964b@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 hrtimer: interrupt took 27351 ns ================================================================== BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline] BUG: KASAN: use-after-free in ucma_put_ctx+0x1d/0x60 drivers/infiniband/core/ucma.c:158 Write of size 4 at addr ffff8801d9193858 by task syz-executor0/5348 CPU: 1 PID: 5348 Comm: syz-executor0 Not tainted 4.19.0-rc2+ #224 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline] ucma_put_ctx+0x1d/0x60 drivers/infiniband/core/ucma.c:158 ucma_resolve_ip+0x24d/0x2a0 drivers/infiniband/core/ucma.c:713 ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 __vfs_write+0x117/0x9d0 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: 0033:0x457099 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:00007f95c9f42c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f95c9f436d4 RCX: 0000000000457099 RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d8100 R14: 00000000004c1c28 R15: 0000000000000001 Allocated by task 5348: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x730 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] ucma_alloc_ctx+0xd5/0x670 drivers/infiniband/core/ucma.c:205 ucma_create_id+0x276/0x9d0 drivers/infiniband/core/ucma.c:496 ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 __vfs_write+0x117/0x9d0 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 5344: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x210 mm/slab.c:3813 ucma_free_ctx+0x9e2/0xe20 drivers/infiniband/core/ucma.c:595 ucma_close+0x10d/0x300 drivers/infiniband/core/ucma.c:1764 __fput+0x38a/0xa40 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 ffff8801d9193800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 88 bytes inside of 256-byte region [ffff8801d9193800, ffff8801d9193900) The buggy address belongs to the page: page:ffffea00076464c0 count:1 mapcount:0 mapping:ffff8801dac007c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0007658488 ffffea000766a688 ffff8801dac007c0 raw: 0000000000000000 ffff8801d9193080 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d9193700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801d9193780: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801d9193800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d9193880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d9193900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ================================================================== --- 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#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches