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Tue, 20 Apr 2021 16:50:13 +0000 Received: from MWHPR10MB1582.namprd10.prod.outlook.com ([fe80::353a:1802:6e91:1811]) by MWHPR10MB1582.namprd10.prod.outlook.com ([fe80::353a:1802:6e91:1811%8]) with mapi id 15.20.4042.024; Tue, 20 Apr 2021 16:50:13 +0000 From: Liam Howlett To: Catalin Marinas , Will Deacon , Julien Grall CC: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Liam Howlett , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "netdev@vger.kernel.org" , "bpf@vger.kernel.org" Subject: [PATCH 2/3] arm64: signal: sigreturn() and rt_sigreturn() sometime returns the wrong signals Thread-Topic: [PATCH 2/3] arm64: signal: sigreturn() and rt_sigreturn() sometime returns the wrong signals Thread-Index: AQHXNgU7cqnWwo9uSUqkb8fv6D7LrA== Date: Tue, 20 Apr 2021 16:50:13 +0000 Message-ID: <20210420165001.3790670-2-Liam.Howlett@Oracle.com> References: <20210420165001.3790670-1-Liam.Howlett@Oracle.com> In-Reply-To: <20210420165001.3790670-1-Liam.Howlett@Oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 authentication-results: arm.com; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR10MB1582.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e0744ab1-4791-486f-fa11-08d9041c5e57 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Apr 2021 16:50:13.3897 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: laZ5VI74wb9uhFf2ZShI/3EYvuwIlpwp46iwZGb8YmG5AzcAF2u4s0t7e3wtW8C6iSnVcTlTYqv1JIlcPlnJvQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB1536 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9960 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 bulkscore=0 malwarescore=0 suspectscore=0 phishscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104200117 X-Proofpoint-ORIG-GUID: YcnjrERkwVhP-xy0laVrSODAkpWcIFea X-Proofpoint-GUID: YcnjrERkwVhP-xy0laVrSODAkpWcIFea X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9960 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxscore=0 adultscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 suspectscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104200117 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org arm64_notify_segfault() was used to force a SIGSEGV in all error cases in sigreturn() and rt_sigreturn() to avoid writing a new sig handler. There is now a better sig handler to use which does not search the VMA address space and return a slightly incorrect error code. Restore the older and correct si_code of SI_KERNEL by using arm64_notify_die(). In the case of !access_ok(), simply return SIGSEGV with si_code SEGV_ACCERR. This change requires exporting arm64_notfiy_die() to the arm64 traps.h Fixes: f71016a8a8c5 (arm64: signal: Call arm64_notify_segfault when failing to deliver signal) Signed-off-by: Liam R. Howlett --- arch/arm64/include/asm/traps.h | 2 ++ arch/arm64/kernel/signal.c | 8 ++++++-- arch/arm64/kernel/signal32.c | 18 ++++++++++++++---- 3 files changed, 22 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.= h index 54f32a0675df..9b76144fcba6 100644 --- a/arch/arm64/include/asm/traps.h +++ b/arch/arm64/include/asm/traps.h @@ -29,6 +29,8 @@ void arm64_notify_segfault(unsigned long addr); void arm64_force_sig_fault(int signo, int code, unsigned long far, const c= har *str); void arm64_force_sig_mceerr(int code, unsigned long far, short lsb, const = char *str); void arm64_force_sig_ptrace_errno_trap(int errno, unsigned long far, const= char *str); +void arm64_notify_die(const char *str, struct pt_regs *regs, int signo, + int sicode, unsigned long far, int err); =20 /* * Move regs->pc to next instruction and do necessary setup before it diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 6237486ff6bb..9fde6dc760c3 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -544,7 +544,7 @@ SYSCALL_DEFINE0(rt_sigreturn) frame =3D (struct rt_sigframe __user *)regs->sp; =20 if (!access_ok(frame, sizeof (*frame))) - goto badframe; + goto e_access; =20 if (restore_sigframe(regs, frame)) goto badframe; @@ -555,7 +555,11 @@ SYSCALL_DEFINE0(rt_sigreturn) return regs->regs[0]; =20 badframe: - arm64_notify_segfault(regs->sp); + arm64_notify_die("Bad frame", regs, SIGSEGV, SI_KERNEL, regs->sp, 0); + return 0; + +e_access: + force_signal_inject(SIGSEGV, SEGV_ACCERR, regs->sp, 0); return 0; } =20 diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index 2f507f565c48..af8b6c0eb8aa 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -248,7 +248,7 @@ COMPAT_SYSCALL_DEFINE0(sigreturn) frame =3D (struct compat_sigframe __user *)regs->compat_sp; =20 if (!access_ok(frame, sizeof (*frame))) - goto badframe; + goto e_access; =20 if (compat_restore_sigframe(regs, frame)) goto badframe; @@ -256,7 +256,12 @@ COMPAT_SYSCALL_DEFINE0(sigreturn) return regs->regs[0]; =20 badframe: - arm64_notify_segfault(regs->compat_sp); + arm64_notify_die("Bad frame", regs, SIGSEGV, SI_KERNEL, + regs->compat_sp, 0); + return 0; + +e_access: + force_signal_inject(SIGSEGV, SEGV_ACCERR, regs->compat_sp, 0); return 0; } =20 @@ -279,7 +284,7 @@ COMPAT_SYSCALL_DEFINE0(rt_sigreturn) frame =3D (struct compat_rt_sigframe __user *)regs->compat_sp; =20 if (!access_ok(frame, sizeof (*frame))) - goto badframe; + goto e_access; =20 if (compat_restore_sigframe(regs, &frame->sig)) goto badframe; @@ -290,7 +295,12 @@ COMPAT_SYSCALL_DEFINE0(rt_sigreturn) return regs->regs[0]; =20 badframe: - arm64_notify_segfault(regs->compat_sp); + arm64_notify_die("Bad frame", regs, SIGSEGV, SI_KERNEL, + regs->compat_sp, 0); + return 0; + +e_access: + force_signal_inject(SIGSEGV, SEGV_ACCERR, regs->compat_sp, 0); return 0; } =20 --=20 2.30.2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DFB0C433B4 for ; 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Tue, 20 Apr 2021 16:50:13 +0000 From: Liam Howlett To: Catalin Marinas , Will Deacon , Julien Grall CC: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Liam Howlett , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "netdev@vger.kernel.org" , "bpf@vger.kernel.org" Subject: [PATCH 2/3] arm64: signal: sigreturn() and rt_sigreturn() sometime returns the wrong signals Thread-Topic: [PATCH 2/3] arm64: signal: sigreturn() and rt_sigreturn() sometime returns the wrong signals Thread-Index: AQHXNgU7cqnWwo9uSUqkb8fv6D7LrA== Date: Tue, 20 Apr 2021 16:50:13 +0000 Message-ID: <20210420165001.3790670-2-Liam.Howlett@Oracle.com> References: <20210420165001.3790670-1-Liam.Howlett@Oracle.com> In-Reply-To: <20210420165001.3790670-1-Liam.Howlett@Oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 authentication-results: arm.com; dkim=none (message not signed) header.d=none;arm.com; dmarc=none action=none header.from=oracle.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org arm64_notify_segfault() was used to force a SIGSEGV in all error cases in sigreturn() and rt_sigreturn() to avoid writing a new sig handler. There is now a better sig handler to use which does not search the VMA address space and return a slightly incorrect error code. Restore the older and correct si_code of SI_KERNEL by using arm64_notify_die(). In the case of !access_ok(), simply return SIGSEGV with si_code SEGV_ACCERR. This change requires exporting arm64_notfiy_die() to the arm64 traps.h Fixes: f71016a8a8c5 (arm64: signal: Call arm64_notify_segfault when failing to deliver signal) Signed-off-by: Liam R. Howlett --- arch/arm64/include/asm/traps.h | 2 ++ arch/arm64/kernel/signal.c | 8 ++++++-- arch/arm64/kernel/signal32.c | 18 ++++++++++++++---- 3 files changed, 22 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h index 54f32a0675df..9b76144fcba6 100644 --- a/arch/arm64/include/asm/traps.h +++ b/arch/arm64/include/asm/traps.h @@ -29,6 +29,8 @@ void arm64_notify_segfault(unsigned long addr); void arm64_force_sig_fault(int signo, int code, unsigned long far, const char *str); void arm64_force_sig_mceerr(int code, unsigned long far, short lsb, const char *str); void arm64_force_sig_ptrace_errno_trap(int errno, unsigned long far, const char *str); +void arm64_notify_die(const char *str, struct pt_regs *regs, int signo, + int sicode, unsigned long far, int err); /* * Move regs->pc to next instruction and do necessary setup before it diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 6237486ff6bb..9fde6dc760c3 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -544,7 +544,7 @@ SYSCALL_DEFINE0(rt_sigreturn) frame = (struct rt_sigframe __user *)regs->sp; if (!access_ok(frame, sizeof (*frame))) - goto badframe; + goto e_access; if (restore_sigframe(regs, frame)) goto badframe; @@ -555,7 +555,11 @@ SYSCALL_DEFINE0(rt_sigreturn) return regs->regs[0]; badframe: - arm64_notify_segfault(regs->sp); + arm64_notify_die("Bad frame", regs, SIGSEGV, SI_KERNEL, regs->sp, 0); + return 0; + +e_access: + force_signal_inject(SIGSEGV, SEGV_ACCERR, regs->sp, 0); return 0; } diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index 2f507f565c48..af8b6c0eb8aa 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -248,7 +248,7 @@ COMPAT_SYSCALL_DEFINE0(sigreturn) frame = (struct compat_sigframe __user *)regs->compat_sp; if (!access_ok(frame, sizeof (*frame))) - goto badframe; + goto e_access; if (compat_restore_sigframe(regs, frame)) goto badframe; @@ -256,7 +256,12 @@ COMPAT_SYSCALL_DEFINE0(sigreturn) return regs->regs[0]; badframe: - arm64_notify_segfault(regs->compat_sp); + arm64_notify_die("Bad frame", regs, SIGSEGV, SI_KERNEL, + regs->compat_sp, 0); + return 0; + +e_access: + force_signal_inject(SIGSEGV, SEGV_ACCERR, regs->compat_sp, 0); return 0; } @@ -279,7 +284,7 @@ COMPAT_SYSCALL_DEFINE0(rt_sigreturn) frame = (struct compat_rt_sigframe __user *)regs->compat_sp; if (!access_ok(frame, sizeof (*frame))) - goto badframe; + goto e_access; if (compat_restore_sigframe(regs, &frame->sig)) goto badframe; @@ -290,7 +295,12 @@ COMPAT_SYSCALL_DEFINE0(rt_sigreturn) return regs->regs[0]; badframe: - arm64_notify_segfault(regs->compat_sp); + arm64_notify_die("Bad frame", regs, SIGSEGV, SI_KERNEL, + regs->compat_sp, 0); + return 0; + +e_access: + force_signal_inject(SIGSEGV, SEGV_ACCERR, regs->compat_sp, 0); return 0; } -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel