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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 S934716AbeCSP5f (ORCPT ); Mon, 19 Mar 2018 11:57:35 -0400 Received: from mail-cys01nam02on0135.outbound.protection.outlook.com ([104.47.37.135]:19273 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934696AbeCSP5c (ORCPT ); Mon, 19 Mar 2018 11:57:32 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: "Eric W. Biederman" , Paul Mackerras , Kumar Gala , Michael Ellerman , Benjamin Herrenschmidt , "linuxppc-dev@lists.ozlabs.org" , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 93/97] signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP Thread-Topic: [PATCH AUTOSEL for 4.14 93/97] signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP Thread-Index: AQHTv5rbBePkbspQaE+7wQ+kiH2pyg== Date: Mon, 19 Mar 2018 15:56:34 +0000 Message-ID: <20180319155411.12348-93-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:sKmftt6T/KPuM8R6XGDdX5QAmW88G58WrAv95BNJA5S9VQvVZceiUHd0QXcDYcAj8WJnFkqStxwD9JWSkxC9Nh7k4mCa+wWOLGwz6lF9fOnoJ5tL1k990ksWL/tTfYHVORLAdLS2Qw6mZHMyaAYZH+gJNZD5E/91tT+feLphkjb9ygvsi/aXjJCtxmafrH4AtPWl5cmFooJbLU029ZMfA7fqLblNGmL9IN7vUfPiyJ1bs2Xjqg9B+URo04i+bXg6;20:Z8c9rcXljP5H0jUct1smhIa81BEZgTynOG5MEg57yrcXq2wn0UY5MICznkwTL6GeN91USt49/kgCGfbruJdegKppw5Cgdwpzk3Vo8nhKLMFdpXdjESFu8yU/knClbp00YXgZUiXJrwOy0nFgr70eN4l6fZsVCSZ+AsgfZAgby8I= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 7a78252a-e32b-40c8-ef61-08d58db21c0f 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)(65623756079841)(101931422205132)(84791874153150); 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)(966005)(86362001)(54906003)(575784001)(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)(6306002)(6512007)(8666007)(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: LRfvrJE0NBRo5Ig9tOg33zn6ekxQwWu6rFrlc08r9If7gFj3SbVMD6KkdrBBsBcFy4338Ljo10WDaZVogHLpLwjUlKjiEmo5f2z/Rn7Ww0yrzmMj180gYbE9nkQJlA3cQBeR8W/ffMNHC+Q2eEOqTM3ZC0bC/adRyLY4Kkx6bNH6UqzXWfOXCMXHc9CagBLRh31B4gGwwNX9il36OPZgou2G0Vqov9C3nIkOqVFxx9EJldDk/xR+1MGw+OUiw3uQ+gMcN6iObKPraHO4Ye6JeLn6ouIhKO6FAjLReFGxBmIqNeEmU3PEJdq+4oqhQ79sF5ZKExgsjkdwQvdjJQ7qJQ== 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: 7a78252a-e32b-40c8-ef61-08d58db21c0f X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 15:56:34.8530 (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 cf4674c46c66e45f238f8f7e81af2a444b970c0a ] 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 that 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 and TRAP_FIXME, siginfo_layout() will now return SIL_FAULT and the appropriate fields will be reliably 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: Paul Mackerras Cc: Kumar Gala Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: linuxppc-dev@lists.ozlabs.org Ref: 9bad068c24d7 ("[PATCH] ppc32: support for e500 and 85xx") Ref: 0ed70f6105ef ("PPC32: Provide proper siginfo information on various ex= ceptions.") History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.= git Signed-off-by: "Eric W. Biederman" Signed-off-by: Sasha Levin --- arch/powerpc/include/uapi/asm/siginfo.h | 15 +++++++++++++++ arch/powerpc/kernel/traps.c | 10 +++++----- 2 files changed, 20 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/uapi/asm/siginfo.h b/arch/powerpc/include= /uapi/asm/siginfo.h index 1a691141e49f..444ca6c9989a 100644 --- a/arch/powerpc/include/uapi/asm/siginfo.h +++ b/arch/powerpc/include/uapi/asm/siginfo.h @@ -18,4 +18,19 @@ #undef NSIGTRAP #define NSIGTRAP 4 =20 +/* + * SIGFPE si_codes + */ +#ifdef __KERNEL__ +#define FPE_FIXME 0 /* Broken dup of SI_USER */ +#endif /* __KERNEL__ */ + +/* + * SIGTRAP si_codes + */ +#ifdef __KERNEL__ +#define TRAP_FIXME 0 /* Broken dup of SI_USER */ +#endif /* __KERNEL__ */ + + #endif /* _ASM_POWERPC_SIGINFO_H */ diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 13c9dcdcba69..f6f6d4bf147c 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -720,7 +720,7 @@ void unknown_exception(struct pt_regs *regs) printk("Bad trap at PC: %lx, SR: %lx, vector=3D%lx\n", regs->nip, regs->msr, regs->trap); =20 - _exception(SIGTRAP, regs, 0, 0); + _exception(SIGTRAP, regs, TRAP_FIXME, 0); =20 exception_exit(prev_state); } @@ -742,7 +742,7 @@ void instruction_breakpoint_exception(struct pt_regs *r= egs) =20 void RunModeException(struct pt_regs *regs) { - _exception(SIGTRAP, regs, 0, 0); + _exception(SIGTRAP, regs, TRAP_FIXME, 0); } =20 void single_step_exception(struct pt_regs *regs) @@ -781,7 +781,7 @@ static void emulate_single_step(struct pt_regs *regs) =20 static inline int __parse_fpscr(unsigned long fpscr) { - int ret =3D 0; + int ret =3D FPE_FIXME; =20 /* Invalid operation */ if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX)) @@ -1769,7 +1769,7 @@ void SPEFloatingPointException(struct pt_regs *regs) extern int do_spe_mathemu(struct pt_regs *regs); unsigned long spefscr; int fpexc_mode; - int code =3D 0; + int code =3D FPE_FIXME; int err; =20 flush_spe_to_thread(current); @@ -1838,7 +1838,7 @@ void SPEFloatingPointRoundException(struct pt_regs *r= egs) printk(KERN_ERR "unrecognized spe instruction " "in %s at %lx\n", current->comm, regs->nip); } else { - _exception(SIGFPE, regs, 0, regs->nip); + _exception(SIGFPE, regs, FPE_FIXME, regs->nip); return; } } --=20 2.14.1