From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3827995-1521496295-2-11841878199224052110 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='com', MailFrom='org', XOriginatingCountry='US' X-Spam-charsets: plain='iso-8859-1' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1521496294; b=kZJ67pPWTXn0ulP1oEBdLX5TwSBzG0CalpLn7/dFJ2MHpu9 p0M/VPwgnP60nMrCx5QI98w49be2FKQhxFyqsME6VRFTLoT3cKcb/p09PfKcz1mM PKlhBIWjrrA8M3Z7iCvLG9G07LXa8h5O3+hbeXotZXS2yzJUV66L0D5JGO3aGbye eTsfJf3UocrVZA9qGgxu/lQZ28TaDdrNWx6Rqga5YmInVaymKpXoPUAoM5EgUDj4 /Rzk7+3VJtrJUwHQ5FsY+8cADzoLdFooqGrCfRyDHHurfpwa9JWwfQkuvUdFN6G0 xMPK+gUsfX37XqoamWALDIQKFL3dMpGbJQNt9FQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :references:in-reply-to:content-type:content-transfer-encoding :mime-version:sender:list-id; s=arctest; t=1521496294; bh=EfvriC eqJJOpvyLlfcMx3nZTr14RoPpCxa0HZlT39T0=; b=dskY5azVo7zEoWESjbB85h D3BAcUstPszWqSRhAhmfau3RGb4s9+OMYtq8c6KMPxAQKtWt4xGymtHnwwcXQurY p0CiBSR2RaTAsMyVZN/7hZVAPe9ui5ouIw3fMseOJ+EVKi4Um8R8mryLSPhzXnyw KmKd5OeVYJ7kCWlX1eDHQ+cEQ8lZNeGpBhkRS1zK7yFRmiyMGOkIyOvTPa+Veh13 Ay3be9xXmVgHPIH/q1J9BNE5EcVOCUyamvT9Ed3nOehQC4qpmBn4ynupHCSxzOxW R3ahw825z/PdPyz+vl806qhb6CTrPn1SZ+WIAUF+ZBXG3X9lZZ7JLKgT9aCo0mSg == ARC-Authentication-Results: i=1; mx3.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=LRw3IaqF x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0 spamcause=gggruggvucftvghtrhhoucdtuddrgedtgedrudefgdduheegucdltddurdegtdefrddttddmucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffuthffkfhfjghitgfggghsphejsehtqhertddttddunecuhfhrohhmpefurghshhgrucfnvghvihhnuceotehlvgigrghnuggvrhdrnfgvvhhinhesmhhitghrohhsohhfthdrtghomheqnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghdpieegrdhssgenucfkphepvddtledrudefvddrudektddrieejpdehvddrudeikedrheegrddvhedvpdhfvgektdemmeefugelsgemjeelvgejmeelgegvsgemheguiedvnecurfgrrhgrmhepihhnvghtpedvtdelrddufedvrddukedtrdeijedphhgvlhhopehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhmrghilhhfrhhomhepoehsthgrsghlvgdqohifnhgvrhesvhhgvghrrdhkvghrnhgvlhdrohhrghequceuqfffjgepkeeukffvoffkoffgucfukfgkgfepuddtudektdenucevlhhushhtvghrufhiiigvpedt; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Authentication-Results: mx3.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=LRw3IaqF x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0 spamcause=gggruggvucftvghtrhhoucdtuddrgedtgedrudefgdduheegucdltddurdegtdefrddttddmucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffuthffkfhfjghitgfggghsphejsehtqhertddttddunecuhfhrohhmpefurghshhgrucfnvghvihhnuceotehlvgigrghnuggvrhdrnfgvvhhinhesmhhitghrohhsohhfthdrtghomheqnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghdpieegrdhssgenucfkphepvddtledrudefvddrudektddrieejpdehvddrudeikedrheegrddvhedvpdhfvgektdemmeefugelsgemjeelvgejmeelgegvsgemheguiedvnecurfgrrhgrmhepihhnvghtpedvtdelrddufedvrddukedtrdeijedphhgvlhhopehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhmrghilhhfrhhomhepoehsthgrsghlvgdqohifnhgvrhesvhhgvghrrdhkvghrnhgvlhdrohhrghequceuqfffjgepkeeukffvoffkoffgucfukfgkgfepuddtudektdenucevlhhushhtvghrufhiiigvpedt; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965030AbeCSVvA (ORCPT ); Mon, 19 Mar 2018 17:51:00 -0400 Received: from mail-co1nam03on0117.outbound.protection.outlook.com ([104.47.40.117]:30064 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S964868AbeCSP57 (ORCPT ); Mon, 19 Mar 2018 11:57:59 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Josh Poimboeuf , Cong Wang , "David S . Miller" , Dmitry Vyukov , Eric Dumazet , Kostya Serebryany , Linus Torvalds , Marcelo Ricardo Leitner , Neil Horman , Peter Zijlstra , Thomas Gleixner , Vlad Yasevich , "linux-sctp@vger.kernel.org" , netdev , syzkaller , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 005/281] x86/asm: Don't use RBP as a temporary register in csum_partial_copy_generic() Thread-Topic: [PATCH AUTOSEL for 4.9 005/281] x86/asm: Don't use RBP as a temporary register in csum_partial_copy_generic() Thread-Index: AQHTv5sKjQIotZEP+0SYyIoaGkWIEQ== Date: Mon, 19 Mar 2018 15:57:54 +0000 Message-ID: <20180319155742.13731-5-alexander.levin@microsoft.com> References: <20180319155742.13731-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155742.13731-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0933;7:hprdSMCdVZ73mSzv2kVDFZnXUsbjQtlVIE74aUkS9qPiNgBGGF35u4aqRV1uRm37Ot/SAObrze45QI8rmtY+j0kAUIAbNeSdqfvu12z4MQc1MOg8y4hh1F4wOZUoM3AQpTsLXKJk/v0xqyqeFAAXpL0c2MnzcFVIY6lub1dbnnKKy3egR4V+L8LdpzgfMfraJkFajNIn58jt79PsvScS45h6SlCH8udBJzi/0SH93NI+uA/QOyEKYZsmP9YoyzxT;20:RJ4ITic+Ed2x1lQX8duZa4S5oQ1q30p2hZt5r+OQb2kUTblmludh1TupvW6KB6eujOqXhBJ9DgyhQVUAcBJHEBrDY+to8ToiQ3xV94zIIRFAOKaTp43BpKY+AMECp/BKj6aPMSfXpN9CD1VIbo9tDjw47gF2K/8hR9YV8t+S4Gk= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 2b56844b-2bd2-442b-07c2-08d58db22d8a x-microsoft-antispam: UriScan:(215639381216008);BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0933; x-ms-traffictypediagnostic: DM5PR2101MB0933: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(215639381216008)(89211679590171)(9452136761055)(85827821059158)(788757137089)(211936372134217)(42068640409301)(153496737603132); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(10201501046)(3002001)(93006095)(93001095)(3231221)(944501300)(52105095)(6055026)(61426038)(61427038)(6041310)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123562045)(20161123560045)(20161123564045)(6072148)(201708071742011);SRVR:DM5PR2101MB0933;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0933; x-forefront-prvs: 06167FAD59 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(39860400002)(396003)(39380400002)(366004)(346002)(376002)(199004)(189003)(2501003)(72206003)(1076002)(7416002)(66066001)(10290500003)(99286004)(10090500001)(7736002)(14454004)(6116002)(5660300001)(2906002)(97736004)(6346003)(102836004)(22452003)(86612001)(3660700001)(186003)(966005)(2900100001)(25786009)(478600001)(5250100002)(26005)(39060400002)(6486002)(6436002)(6306002)(81156014)(81166006)(36756003)(4326008)(86362001)(76176011)(6512007)(8936002)(106356001)(3846002)(53936002)(105586002)(3280700002)(305945005)(68736007)(110136005)(2950100002)(54906003)(8676002)(107886003)(316002)(6506007)(59450400001)(22906009)(41533002)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0933;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: IAd1khrmgIJdQmqhPbjXW24JbMZfhHDHSjoP+wv4Eue9br3RR2QY7gi66s0mw0nzcv/VxDiPLtCodeVjdXUvxBOKL5/mN2Y1EEoRnKmr00bM9iWnDBdHknqifBvOARmtEDeWjbr8SWQXXqYHlAfjtuuP/ACOoIZXfTTCsHRf1CYq4Ev5eAP9VEflZImqMm5VOZoq07DM+/vBf3MBJ/NIPY/UOzid7rk1+xPcBJ+eFutqNt/3j4W3LfBhXqfGAK8QoWsh3Lso8jdtbgz5Hd4+PE+wYJCqY5Ryv2phS2FCUGL35RCZ57XUAwUvHewAMpevTQzOYm1Jf9Q6wuhE6LiS8w== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2b56844b-2bd2-442b-07c2-08d58db22d8a X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 15:57:54.8697 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0933 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Josh Poimboeuf [ Upstream commit 42fc6c6cb1662ba2fa727dd01c9473c63be4e3b6 ] Andrey Konovalov reported the following warning while fuzzing the kernel with syzkaller: WARNING: kernel stack regs at ffff8800686869f8 in a.out:4933 has bad 'bp'= value c3fc855a10167ec0 The unwinder dump revealed that RBP had a bad value when an interrupt occurred in csum_partial_copy_generic(). That function saves RBP on the stack and then overwrites it, using it as a scratch register. That's problematic because it breaks stack traces if an interrupt occurs in the middle of the function. Replace the usage of RBP with another callee-saved register (R15) so stack traces are no longer affected. Reported-by: Andrey Konovalov Tested-by: Andrey Konovalov Signed-off-by: Josh Poimboeuf Cc: Cong Wang Cc: David S . Miller Cc: Dmitry Vyukov Cc: Eric Dumazet Cc: Kostya Serebryany Cc: Linus Torvalds Cc: Marcelo Ricardo Leitner Cc: Neil Horman Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Vlad Yasevich Cc: linux-sctp@vger.kernel.org Cc: netdev Cc: syzkaller Link: http://lkml.kernel.org/r/4b03a961efda5ec9bfe46b7b9c9ad72d1efad343.149= 3909486.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- arch/x86/lib/csum-copy_64.S | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/lib/csum-copy_64.S b/arch/x86/lib/csum-copy_64.S index 7e48807b2fa1..45a53dfe1859 100644 --- a/arch/x86/lib/csum-copy_64.S +++ b/arch/x86/lib/csum-copy_64.S @@ -55,7 +55,7 @@ ENTRY(csum_partial_copy_generic) movq %r12, 3*8(%rsp) movq %r14, 4*8(%rsp) movq %r13, 5*8(%rsp) - movq %rbp, 6*8(%rsp) + movq %r15, 6*8(%rsp) =20 movq %r8, (%rsp) movq %r9, 1*8(%rsp) @@ -74,7 +74,7 @@ ENTRY(csum_partial_copy_generic) /* main loop. clear in 64 byte blocks */ /* r9: zero, r8: temp2, rbx: temp1, rax: sum, rcx: saved length */ /* r11: temp3, rdx: temp4, r12 loopcnt */ - /* r10: temp5, rbp: temp6, r14 temp7, r13 temp8 */ + /* r10: temp5, r15: temp6, r14 temp7, r13 temp8 */ .p2align 4 .Lloop: source @@ -89,7 +89,7 @@ ENTRY(csum_partial_copy_generic) source movq 32(%rdi), %r10 source - movq 40(%rdi), %rbp + movq 40(%rdi), %r15 source movq 48(%rdi), %r14 source @@ -103,7 +103,7 @@ ENTRY(csum_partial_copy_generic) adcq %r11, %rax adcq %rdx, %rax adcq %r10, %rax - adcq %rbp, %rax + adcq %r15, %rax adcq %r14, %rax adcq %r13, %rax =20 @@ -121,7 +121,7 @@ ENTRY(csum_partial_copy_generic) dest movq %r10, 32(%rsi) dest - movq %rbp, 40(%rsi) + movq %r15, 40(%rsi) dest movq %r14, 48(%rsi) dest @@ -203,7 +203,7 @@ ENTRY(csum_partial_copy_generic) movq 3*8(%rsp), %r12 movq 4*8(%rsp), %r14 movq 5*8(%rsp), %r13 - movq 6*8(%rsp), %rbp + movq 6*8(%rsp), %r15 addq $7*8, %rsp ret =20 --=20 2.14.1