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[23.128.96.18]) by mx.google.com with ESMTP id dd19si1471714edb.594.2020.11.12.05.51.29; Thu, 12 Nov 2020 05:51:51 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728329AbgKLNte convert rfc822-to-8bit (ORCPT + 99 others); Thu, 12 Nov 2020 08:49:34 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:54452 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727264AbgKLNtc (ORCPT ); Thu, 12 Nov 2020 08:49:32 -0500 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-160-14xZjbThOIiOpSvgo6sl3w-1; Thu, 12 Nov 2020 13:49:27 +0000 X-MC-Unique: 14xZjbThOIiOpSvgo6sl3w-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Thu, 12 Nov 2020 13:49:27 +0000 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Thu, 12 Nov 2020 13:49:27 +0000 From: David Laight To: 'Rob Landley' , kernel test robot CC: "linux-kernel@vger.kernel.org" , 0day robot , "lkp@lists.01.org" Subject: RE: ac0e958a00: Kernel_panic-not_syncing:stack-protector:Kernel_stack_is_corrupted_in:run_init_process Thread-Topic: ac0e958a00: Kernel_panic-not_syncing:stack-protector:Kernel_stack_is_corrupted_in:run_init_process Thread-Index: AQHWuPBHLSpk3pJOe0+t4d8Pl80aaanEgitA Date: Thu, 12 Nov 2020 13:49:27 +0000 Message-ID: <2bd72a2f0af948d29eb201e3072e514e@AcuMS.aculab.com> References: <20201112071145.GC17067@xsang-OptiPlex-9020> <87765a0e-3a49-d437-4010-4848b8ece199@landley.net> In-Reply-To: <87765a0e-3a49-d437-4010-4848b8ece199@landley.net> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rob Landley > Sent: 12 November 2020 12:46 > > On 11/12/20 1:11 AM, kernel test robot wrote: > > > > Greeting, > > > > FYI, we noticed the following commit (built with gcc-9): > > Blah, switched from strlcpy to sprintf due to the lack of spaces and didn't > adjust the size. > > (And yes, the compiler's lifetime analysis should free the stack space before > the tail call, and I'd assume exec restarts the stack anyway.) > > Second-attempt-by: Rob Landley > --- > > init/main.c | 15 ++++++++------- > 1 file changed, 8 insertions(+), 7 deletions(-) > > diff --git a/init/main.c b/init/main.c > index 130376ec10ba..e92320816ef8 100644 > --- a/init/main.c > +++ b/init/main.c > @@ -1328,15 +1328,16 @@ static void __init do_pre_smp_initcalls(void) > static int run_init_process(const char *init_filename) > { > const char *const *p; > + char buf[512], *s = buf; > > argv_init[0] = init_filename; > - pr_info("Run %s as init process\n", init_filename); > - pr_debug(" with arguments:\n"); > - for (p = argv_init; *p; p++) > - pr_debug(" %s\n", *p); > - pr_debug(" with environment:\n"); > - for (p = envp_init; *p; p++) > - pr_debug(" %s\n", *p); > + > + for (p = (void *)envp_init; *p; p++) > + s += sprintf(s, "%.*s ", (int)(sizeof(buf)-(s-buf)-2), *p); > + for (p = (void *)argv_init; *p; p++) > + s += sprintf(s, "%.*s ", (int)(sizeof(buf)-(s-buf)-2), *p); > + pr_info("Run init: %s\n", buf); > + Why not use scnprintf() as: len += scnprintf(buf + len, 256 - len, " %s", *p); or even: s = buf + sizeof buf; len = sizeof buf; ... len -= scnprintf(s - len, len, " %s", *p); and remove the " " before the %s in the final pr_info(). David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)