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Biederman" , James Hogan , "linux-metag@vger.kernel.org" , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 92/97] signal/metag: Document a conflict with SI_USER with SIGFPE Thread-Topic: [PATCH AUTOSEL for 4.14 92/97] signal/metag: Document a conflict with SI_USER with SIGFPE Thread-Index: AQHTv5ragmxY3baYQ02Dymbfz7UF7g== Date: Mon, 19 Mar 2018 15:56:32 +0000 Message-ID: <20180319155411.12348-92-alexander.levin@microsoft.com> References: <20180319155411.12348-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155411.12348-1-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;DM5PR2101MB1096;7:EQVIuL5doPVMZtgIXyL+qiykHELSY4ZFO1cMgRsKPvPYdrsbtV8PmBmN193PXg1ueqiEdyNvZlQNxgLyk7IGxyJoSlhuFiGwb6FrRfCZIHlEAZE8J1izgC/x1U/8P2N9I2l720e+yG4wsM7/PSbcLLTErc6RhAHTBQ2Vmq6l/zCRz4XESJDIL6rF7WTsZ+BVTX3KQI1oWjZc3L3+GWvqKb5jSeFMI+e28zSeJvFiTvPTyZSE2+/8vcpHZjw48Drr;20:3EoECHA1pymKQ+8/v18eQ65NzaVP90TY6hLhiqeX+jlUcXZEd8en9LWRwBLTtA5U0ZBINrQ7fmfLG3w8/Mb7pJ90/pdE4U8cLniop9MQqXzs31toWGa+Q4mFpMWbfw7nSKgzf/uyP4YEexSvkX6UjJyHoMD/BC4BFAsNIMTg1p0= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 833c3c9f-1506-4301-e40b-08d58db21bc3 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1096; x-ms-traffictypediagnostic: DM5PR2101MB1096: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(9452136761055); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(3231221)(944501300)(52105095)(3002001)(93006095)(93001095)(10201501046)(6055026)(61426038)(61427038)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(20161123562045)(20161123564045)(20161123558120)(6072148)(201708071742011);SRVR:DM5PR2101MB1096;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1096; x-forefront-prvs: 06167FAD59 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(346002)(39860400002)(396003)(366004)(376002)(39380400002)(189003)(199004)(86612001)(316002)(26005)(72206003)(4326008)(25786009)(110136005)(10290500003)(86362001)(54906003)(575784001)(59450400001)(14454004)(53936002)(36756003)(107886003)(3280700002)(22452003)(6506007)(5660300001)(68736007)(186003)(99286004)(478600001)(76176011)(6666003)(10090500001)(102836004)(2950100002)(6116002)(5250100002)(2501003)(97736004)(3660700001)(106356001)(81156014)(81166006)(8936002)(8676002)(7736002)(305945005)(2900100001)(105586002)(3846002)(1076002)(2906002)(6436002)(66066001)(6512007)(6486002)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1096;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; x-microsoft-antispam-message-info: JGzLlz1q6vi3Q8kVB08wFj82TRwoK5XjqO8Eo8Z7MtmL8xGUdopQXBXmyIxfTQBoTCBj0ZygAy+6hkTg19QY+zB5dCAF+bENEDajaNxCAaXM8q8EICoFiGnhDPihgOMQ66lMS4zlLKVeSK3uZ2x0z39ULAdYzn0Rh/x1SAaGJNEDx0pr7iSqMs7LRiR8085JlVyPFBzYGpB+HMgctCrs9Vwy3+hSzjN3QON8k/D/Gfnzp5Ly4pih1ls3BvIcn6up3qlS4Z+2vkyR7FnhuVlg68x4LmjL3EMZxTfJ/myWz/Gg7dCH9exo1k4zvNa+37MHTRO09O7ZPR45h81Ar8U3QA== 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: 833c3c9f-1506-4301-e40b-08d58db21bc3 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 15:56:32.9066 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1096 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: "Eric W. Biederman" [ Upstream commit b80328be53c215346b153769267b38f531d89b4f ] Setting si_code to 0 results in a userspace seeing an si_code of 0. This is the same si_code as SI_USER. Posix and common sense requires that SI_USER not be a signal specific si_code. As such this use of 0 for the si_code is a pretty horribly broken ABI. Further use of si_code =3D=3D 0 guaranteed that copy_siginfo_to_user saw a value of __SI_KILL and now sees a value of SIL_KILL with the result hat uid and pid fields are copied and which might copying the si_addr field by accident but certainly not by design. Making this a very flakey implementation. Utilizing FPE_FIXME siginfo_layout will now return SIL_FAULT and the appropriate fields will reliably be copied. Possible ABI fixes includee: - Send the signal without siginfo - Don't generate a signal - Possibly assign and use an appropriate si_code - Don't handle cases which can't happen Cc: James Hogan Cc: linux-metag@vger.kernel.org Ref: ac919f0883e5 ("metag: Traps") Signed-off-by: "Eric W. Biederman" Signed-off-by: Sasha Levin --- arch/metag/include/uapi/asm/siginfo.h | 7 +++++++ arch/metag/kernel/traps.c | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/metag/include/uapi/asm/siginfo.h b/arch/metag/include/uap= i/asm/siginfo.h index b54ef7186ca3..9a3f6cde9487 100644 --- a/arch/metag/include/uapi/asm/siginfo.h +++ b/arch/metag/include/uapi/asm/siginfo.h @@ -6,4 +6,11 @@ =20 #include =20 +/* + * SIGFPE si_codes + */ +#ifdef __KERNEL__ +#define FPE_FIXME 0 /* Broken dup of SI_USER */ +#endif /* __KERNEL__ */ + #endif diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c index 444851e510d5..3b62b1b0c0b5 100644 --- a/arch/metag/kernel/traps.c +++ b/arch/metag/kernel/traps.c @@ -735,7 +735,7 @@ TBIRES fpe_handler(TBIRES State, int SigNum, int Trigge= rs, int Inst, PTBI pTBI) else if (error_state & TXSTAT_FPE_INEXACT_BIT) info.si_code =3D FPE_FLTRES; else - info.si_code =3D 0; + info.si_code =3D FPE_FIXME; info.si_errno =3D 0; info.si_addr =3D (__force void __user *)regs->ctx.CurrPC; force_sig_info(SIGFPE, &info, current); --=20 2.14.1