From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938925AbdEAPh7 (ORCPT ); Mon, 1 May 2017 11:37:59 -0400 Received: from mout.gmx.net ([212.227.15.18]:51323 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932894AbdEAPfc (ORCPT ); Mon, 1 May 2017 11:35:32 -0400 To: Linux Kernel From: =?UTF-8?Q?Toralf_F=c3=b6rster?= Subject: UBSAN warnings in kernel/sysctl.c:2215:10 for 4.10.13 Message-ID: <6ca26fb1-b7cb-ff3e-ac76-760eec019eef@gmx.de> Date: Mon, 1 May 2017 17:11:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K0:ZucRivSGOfF1KaGG9MR6dcGsJFb9/EIqDI2Ey903SYnlLOI4l5U FpaHlGnGxaJbOp+dDa04SwOE0y6ZYZrdItnGNe3a3htBZ3fELlmeRMq6UX7kHmoT3uR1Z2q h87+uVmd8eCmgyN06XPXKxsgVB4Ldugr/IcQNApU3OndsZgc22RKfd9jsLfpVkn+mhzpJdG pOMMePPpW56bYtjfYbrGA== X-UI-Out-Filterresults: notjunk:1;V01:K0:AuD3kap6bQE=:ztKW1wnQUMN8v9zn9GZSV4 cO+ntLAHrMB0pCQXMBk12jDNhJnhB8Re3TSsXtjNCjeySALItzffNsgo/s3YRM/+WGH0/9jsA eEXEIXIOIkF7lJt40LFlOZWFxwD/Z7WUMry4H2lZNTSNGMhAkxD/z8YX+UvFtKsGEBDG265rZ ngWGIRrRMelqQ9wlo28+kp5at7ti9HCOqLvkePBmxdYGGYg1FkMxzNn7oi/86FmVhCYMTYv96 nlbHt0PfXIwIWHgcz+8zP7T2GDVZXeCaM0C5yUr69GhP+s495eHNxu2R+sfaZPUDR105MAxH4 jzJYqswQ/W82/ko/naxK4zTi8fLUeYVkODt79czjp5jXf3zJ9RvTPvMMZch/ApIIxy7ims/iW EVH0YUeHJlXvJpKmF7ctlucz47ZYfW0UFEu1WNg/X6OEWY1jKyO5vKEzfhLcTEJk0RK9Re+B1 usJPwJ6XEywAbHn2954MW6ix+iiBnRcK+l0VcoA8jcqdzV5oLEKMcW7/+wEHYiEzj/bE/6KLV hFrpEc0Q/xgoPr+UlEqoRSflSTBEhOExUel5Gim7sFWkq0+mi9qCowmtZZHTz66hDrz9jKaI4 EtMY6wprPhZgmUYzi/+3geukBv2+n+KxdsSTvF0B/EZJmgWK7+7ursyDgdifZOIeT4NLr2pvI yu5Refm/9HbslF4V4cIJ4kOW7KJmS4vGVNWSzVTLRnYh8/X7pMHCTpfjafjKo8ErB9JIuzCBv MBBtSokjvBozGnECgse7pgPWZRLxjW653J++g//LK8RmjJ5m7IsrNKhIOwCfi8AGSwIlJfDCV BWQQ5H0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Whilst I'm wondering about missing kern.log entries of my server for about 13 hours within last night I stumbled over this : May 1 05:53:19 mr-fox kernel: [63395.062218] ================================================================================ May 1 05:53:19 mr-fox kernel: [63395.062221] UBSAN: Undefined behaviour in kernel/sysctl.c:2215:10 May 1 05:53:19 mr-fox kernel: [63395.062223] load of value 255 is not a valid value for type '_Bool' May 1 05:53:19 mr-fox kernel: [63395.062226] CPU: 3 PID: 12243 Comm: sysctl Not tainted 4.10.13 #4 May 1 05:53:19 mr-fox kernel: [63395.062227] Hardware name: /DX79TO, BIOS SIX7910J.86A.0650.2014.0307.0138 03/07/2014 May 1 05:53:19 mr-fox kernel: [63395.062228] Call Trace: May 1 05:53:19 mr-fox kernel: [63395.062236] dump_stack+0x60/0x9c May 1 05:53:19 mr-fox kernel: [63395.062239] ubsan_epilogue+0xd/0x40 May 1 05:53:19 mr-fox kernel: [63395.062242] __ubsan_handle_load_invalid_value+0x75/0xa0 May 1 05:53:19 mr-fox kernel: [63395.062245] ? terminate_walk+0x10a/0x1b0 May 1 05:53:19 mr-fox kernel: [63395.062249] __do_proc_dointvec+0x447/0x4d0 May 1 05:53:19 mr-fox kernel: [63395.062250] ? do_proc_dointvec_conv+0x1f0/0x1f0 May 1 05:53:19 mr-fox kernel: [63395.062252] proc_douintvec+0x3f/0x70 May 1 05:53:19 mr-fox kernel: [63395.062254] ? do_proc_dointvec_conv+0x1f0/0x1f0 May 1 05:53:19 mr-fox kernel: [63395.062256] ? sysctl_perm+0x7e/0xe0 May 1 05:53:19 mr-fox kernel: [63395.062258] proc_sys_call_handler+0xe4/0x130 May 1 05:53:19 mr-fox kernel: [63395.062259] proc_sys_read+0xc/0x10 May 1 05:53:19 mr-fox kernel: [63395.062262] __vfs_read+0x54/0x2a0 May 1 05:53:19 mr-fox kernel: [63395.062263] vfs_read+0xbc/0x210 May 1 05:53:19 mr-fox kernel: [63395.062265] SyS_read+0x50/0xc0 May 1 05:53:19 mr-fox kernel: [63395.062269] entry_SYSCALL_64_fastpath+0x13/0x94 May 1 05:53:19 mr-fox kernel: [63395.062270] RIP: 0033:0x7f202f39da40 May 1 05:53:19 mr-fox kernel: [63395.062272] RSP: 002b:00007ffcf606b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 May 1 05:53:19 mr-fox kernel: [63395.062274] RAX: ffffffffffffffda RBX: 0000000000002010 RCX: 00007f202f39da40 May 1 05:53:19 mr-fox kernel: [63395.062275] RDX: 0000000000000400 RSI: 000000000070c020 RDI: 0000000000000006 May 1 05:53:19 mr-fox kernel: [63395.062276] RBP: 00007f202f66baa0 R08: 0000000000000411 R09: 0000000000000000 May 1 05:53:19 mr-fox kernel: [63395.062278] R10: 0000000000006d50 R11: 0000000000000246 R12: 00007f202f66bed1 May 1 05:53:19 mr-fox kernel: [63395.062278] R13: 00000000000000e1 R14: 0000000000000000 R15: 0000000000000000 May 1 05:53:19 mr-fox kernel: [63395.062279] ================================================================================ Line 2215 was last changed 7 years ago: err = proc_put_long(&buffer, &left, lval, neg); so is UBSAN wrong here ? -- Toralf PGP C4EACDDE 0076E94E