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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,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 D188DECE58F for ; Tue, 15 Oct 2019 21:22:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A605720872 for ; Tue, 15 Oct 2019 21:22:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730262AbfJOVWO (ORCPT ); Tue, 15 Oct 2019 17:22:14 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:44412 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org 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MIME-Version: 1.0 X-Received: by 2002:a02:c608:: with SMTP id i8mr27404680jan.40.1571174527867; Tue, 15 Oct 2019 14:22:07 -0700 (PDT) Date: Tue, 15 Oct 2019 14:22:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009d211f0594f99317@google.com> Subject: KMSAN: uninit-value in sysfs_format_mac From: syzbot To: allison@lohutok.net, bgolaszewski@baylibre.com, daniel@iogearbox.net, davem@davemloft.net, glider@google.com, hkallweit1@gmail.com, linux-kernel@vger.kernel.org, lirongqing@baidu.com, maximmi@mellanox.com, netdev@vger.kernel.org, olteanv@gmail.com, saeedm@mellanox.com, sdf@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c2453450 kmsan: kcov: prettify the code unpoisoning area->.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1342116f600000 kernel config: https://syzkaller.appspot.com/x/.config?x=3684f3c73f43899a dashboard link: https://syzkaller.appspot.com/bug?extid=dac45508e04ca7aba764 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11083f9f600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c7073b600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+dac45508e04ca7aba764@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in hex_string+0x7d8/0x8d0 lib/vsprintf.c:1098 CPU: 0 PID: 12732 Comm: udevd Not tainted 5.4.0-rc3+ #0 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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x14a/0x2f0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245 hex_string+0x7d8/0x8d0 lib/vsprintf.c:1098 pointer+0xbfe/0x1d10 lib/vsprintf.c:2136 vsnprintf+0x1c0c/0x3210 lib/vsprintf.c:2514 vscnprintf lib/vsprintf.c:2613 [inline] scnprintf+0x235/0x300 lib/vsprintf.c:2667 sysfs_format_mac+0xde/0x100 net/ethernet/eth.c:444 address_show+0x159/0x1d0 net/core/net-sysfs.c:150 dev_attr_show+0xd8/0x1e0 drivers/base/core.c:967 sysfs_kf_seq_show+0x434/0x7b0 fs/sysfs/file.c:60 kernfs_seq_show+0x164/0x1e0 fs/kernfs/file.c:167 seq_read+0xac6/0x1d90 fs/seq_file.c:229 kernfs_fop_read+0x2c3/0x9a0 fs/kernfs/file.c:251 __vfs_read+0x1a9/0xc90 fs/read_write.c:425 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x7f90a0b58310 Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 RSP: 002b:00007ffdd54d89d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f90a0b58310 RDX: 0000000000001000 RSI: 00007ffdd54d8e80 RDI: 0000000000000005 RBP: 00007ffdd54d9fb0 R08: 00007ffdd54d9fb0 R09: 00007f90a0bae7d0 R10: 342f346273752f33 R11: 0000000000000246 R12: 00000000024071f0 R13: 00000000024072e0 R14: 0000000000000001 R15: 0000000002410159 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline] kmsan_internal_chain_origin+0xbd/0x170 mm/kmsan/kmsan.c:317 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:253 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:273 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 set_ethernet_addr drivers/net/usb/rtl8150.c:282 [inline] rtl8150_probe+0x1143/0x14a0 drivers/net/usb/rtl8150.c:912 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x581d/0x72f0 drivers/usb/core/hub.c:5441 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----node_id.i@rtl8150_probe Variable was created at: get_registers drivers/net/usb/rtl8150.c:911 [inline] set_ethernet_addr drivers/net/usb/rtl8150.c:281 [inline] rtl8150_probe+0xdc8/0x14a0 drivers/net/usb/rtl8150.c:912 get_registers drivers/net/usb/rtl8150.c:911 [inline] set_ethernet_addr drivers/net/usb/rtl8150.c:281 [inline] rtl8150_probe+0xdc8/0x14a0 drivers/net/usb/rtl8150.c:912 ===================================================== --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches