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Biederman" , Paul Mackerras , Kumar Gala , Michael Ellerman , Benjamin Herrenschmidt , "linuxppc-dev@lists.ozlabs.org" , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 279/281] signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP Thread-Topic: [PATCH AUTOSEL for 4.9 279/281] signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP Thread-Index: AQHTv5vQDL36gzrybkG1qKWZGFmRsQ== Date: Mon, 19 Mar 2018 16:03:26 +0000 Message-ID: <20180319155742.13731-279-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;DM5PR2101MB0728;7:D5hC2hLs4ihv5tss0q7g/ZDHj8eh25Rw0n4eQ9Xo2eChbCd2J3t3rOE8RSYFYJAZlRhHsFIq1pewlllyXp7OU8LO5YLxH1AvNkM4EA3jz0j/00E4Ijr/R4BMHb68gwyPqFea/3l6LD1GFEqAcfrQaWP1TiZ1gMk5qpzH6UZCXL2Cqbcaw3vZyteizuAJE3UCOvM6Z200hg8xT5X3kp6vbHGkR9O6eEGSo9VWV9AYmBFTfC5X3kVSphR6AX7D1GIs;20:qC+6GqJXV6KcO7IJq7K9pCr9KRYtwKnntbivaKrbu/NCi5QSmVQYFLER+YvMj49yuBWScxjiCepx4eOyOQfl/lA4aubcPc64hJnHoPB1i+ofO0hUBMQFTd7DE96GBXxQeXWsiwdXJOIkP6yRlcMYNc7W7pVqDC0kcRLNENpGgMQ= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 1bac99cd-1e70-45d0-69ab-08d58db364e4 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0728; x-ms-traffictypediagnostic: DM5PR2101MB0728: 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:DM5PR2101MB0728;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0728; x-forefront-prvs: 06167FAD59 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(366004)(39380400002)(346002)(376002)(39860400002)(396003)(199004)(189003)(8936002)(99286004)(575784001)(478600001)(53936002)(107886003)(966005)(110136005)(86612001)(72206003)(97736004)(76176011)(316002)(3280700002)(5250100002)(2501003)(36756003)(2906002)(105586002)(1076002)(86362001)(14454004)(6436002)(54906003)(8666007)(6512007)(6116002)(6486002)(6306002)(106356001)(3846002)(22452003)(3660700001)(186003)(68736007)(66066001)(25786009)(102836004)(4326008)(10290500003)(26005)(6666003)(305945005)(2950100002)(7736002)(10090500001)(81156014)(81166006)(8676002)(6506007)(5660300001)(2900100001)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0728;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-microsoft-antispam-message-info: jl265l1mymNmKWiFw2LJ12n3YBeUS6iYGDmMwupRuluiBwJ0/aKSzFD8cVSeBc4qH7CTRDQnNv6yHwY1OkBLJ6mDVbRDkGX+DRkemi/oQw9bvVVJ5xi/3c6ipYaRVxDv05s3/EJcCs9RG/NFFBoNsHkPCL90OvO3g/GBGtfB1iTKs4PTZJwiCoDebcDAUx87/FPXqcKG+PtAjyTZl2xVFm+YJpljCASMRQrPSZSxJ2geHeaEotdh8VlWOlK2h3Gcvkm3/OBzSvS9W0v3ZDAoLIBjRyJCMrrDFZsbI/OcqmcOdAV8ESYSZvMPRnwJSKBILJLZOZRvxcK7mAsR2Ta+Hw== 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: 1bac99cd-1e70-45d0-69ab-08d58db364e4 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 16:03:26.5274 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0728 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 ccce3ef5cd86..9c437eaf7c21 100644 --- a/arch/powerpc/include/uapi/asm/siginfo.h +++ b/arch/powerpc/include/uapi/asm/siginfo.h @@ -17,4 +17,19 @@ #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 43021f8e47a6..7e5b0bbbe4c8 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -793,7 +793,7 @@ 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); } @@ -815,7 +815,7 @@ 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) @@ -851,7 +851,7 @@ 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)) @@ -1855,7 +1855,7 @@ 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); @@ -1924,7 +1924,7 @@ 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