From patchwork Tue Nov 14 09:29:08 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamalesh Babulal X-Patchwork-Id: 837761 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybj4z15kjz9s0Z for ; Tue, 14 Nov 2017 20:34:11 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybj4z077nzDqrG for ; Tue, 14 Nov 2017 20:34:11 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=kamalesh@linux.vnet.ibm.com; receiver=) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3ybhzl725pzDqwP for ; Tue, 14 Nov 2017 20:29:39 +1100 (AEDT) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vAE9TRLj115333 for ; Tue, 14 Nov 2017 04:29:37 -0500 Received: from e06smtp11.uk.ibm.com (e06smtp11.uk.ibm.com [195.75.94.107]) by mx0b-001b2d01.pphosted.com with ESMTP id 2e7vjm476p-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 14 Nov 2017 04:29:37 -0500 Received: from localhost by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 14 Nov 2017 09:29:31 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id vAE9TVwj42598622; Tue, 14 Nov 2017 09:29:31 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D13EBAE051; Tue, 14 Nov 2017 09:22:57 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 09CD7AE045; Tue, 14 Nov 2017 09:22:56 +0000 (GMT) Received: from localhost.localdomain (unknown [9.40.192.198]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 14 Nov 2017 09:22:55 +0000 (GMT) From: Kamalesh Babulal To: Michael Ellerman Subject: [PATCH v4 1/3] kernel/modules: Add REL24 relocation support of livepatch symbols Date: Tue, 14 Nov 2017 04:29:08 -0500 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20171114092910.20399-1-kamalesh@linux.vnet.ibm.com> References: <20171114092910.20399-1-kamalesh@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17111409-0040-0000-0000-0000040E0AF8 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17111409-0041-0000-0000-000020B0BD51 Message-Id: <20171114092910.20399-2-kamalesh@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-11-14_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1711140129 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Aravinda Prasad , Jessica Yu , linux-kernel@vger.kernel.org, Kamalesh Babulal , Torsten Duwe , Josh Poimboeuf , live-patching@vger.kernel.org, "Naveen N . Rao" , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Livepatch re-uses module loader function apply_relocate_add() to write relocations, instead of managing them by arch-dependent klp_write_module_reloc() function. apply_relocate_add() doesn't understand livepatch symbols (marked with SHN_LIVEPATCH symbol section index) and assumes them to be local symbols by default for R_PPC64_REL24 relocation type. It fails with an error, when trying to calculate offset with local_entry_offset(): module_64: kpatch_meminfo: REL24 -1152921504897399800 out of range! Whereas livepatch symbols are essentially SHN_UNDEF, should be called via stub used for global calls. This issue can be fixed by teaching apply_relocate_add() to handle both SHN_UNDEF/SHN_LIVEPATCH symbols via the same stub. This patch extends SHN_UNDEF code to handle livepatch symbols too. Signed-off-by: Kamalesh Babulal CC: Balbir Singh Cc: Naveen N. Rao Cc: Josh Poimboeuf Cc: Jessica Yu Cc: Ananth N Mavinakayanahalli Cc: Aravinda Prasad Cc: Torsten Duwe --- arch/powerpc/kernel/module_64.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index 0b0f896..39b01fd 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -613,7 +613,8 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, case R_PPC_REL24: /* FIXME: Handle weak symbols here --RR */ - if (sym->st_shndx == SHN_UNDEF) { + if (sym->st_shndx == SHN_UNDEF || + sym->st_shndx == SHN_LIVEPATCH) { /* External: go via stub */ value = stub_for_addr(sechdrs, value, me); if (!value) From patchwork Tue Nov 14 09:29:09 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamalesh Babulal X-Patchwork-Id: 837762 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybj6N11HGz9s0Z for ; Tue, 14 Nov 2017 20:35:24 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybj6N05X8zDqn7 for ; Tue, 14 Nov 2017 20:35:24 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=kamalesh@linux.vnet.ibm.com; receiver=) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3ybhzp07vDzDqpq for ; Tue, 14 Nov 2017 20:29:41 +1100 (AEDT) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vAE9TONn107775 for ; Tue, 14 Nov 2017 04:29:40 -0500 Received: from e06smtp11.uk.ibm.com (e06smtp11.uk.ibm.com [195.75.94.107]) by mx0a-001b2d01.pphosted.com with ESMTP id 2e7utre5by-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 14 Nov 2017 04:29:39 -0500 Received: from localhost by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 14 Nov 2017 09:29:34 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id vAE9TXGI4325684; Tue, 14 Nov 2017 09:29:33 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 40D8BAE053; Tue, 14 Nov 2017 09:23:00 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 21996AE04D; Tue, 14 Nov 2017 09:22:59 +0000 (GMT) Received: from localhost.localdomain (unknown [9.40.192.198]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 14 Nov 2017 09:22:58 +0000 (GMT) From: Kamalesh Babulal To: Michael Ellerman Subject: [PATCH v4 2/3] powerpc/modules: Don't try to restore r2 after a sibling call Date: Tue, 14 Nov 2017 04:29:09 -0500 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20171114092910.20399-1-kamalesh@linux.vnet.ibm.com> References: <20171114092910.20399-1-kamalesh@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17111409-0040-0000-0000-0000040E0AFA X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17111409-0041-0000-0000-000020B0BD52 Message-Id: <20171114092910.20399-3-kamalesh@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-11-14_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1711140129 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, Kamalesh Babulal , Josh Poimboeuf , live-patching@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Josh Poimboeuf When attempting to load a livepatch module, I got the following error: module_64: patch_module: Expect noop after relocate, got 3c820000 The error was triggered by the following code in unregister_netdevice_queue(): 14c: 00 00 00 48 b 14c 14c: R_PPC64_REL24 net_set_todo 150: 00 00 82 3c addis r4,r2,0 GCC didn't insert a nop after the branch to net_set_todo() because it's a sibling call, so it never returns. The nop isn't needed after the branch in that case. Signed-off-by: Josh Poimboeuf Signed-off-by: Kamalesh Babulal Acked-by: Naveen N. Rao --- arch/powerpc/kernel/module_64.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index 39b01fd..9e5391f 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -489,6 +489,10 @@ static int restore_r2(u32 *instruction, struct module *me) if (is_early_mcount_callsite(instruction - 1)) return 1; + /* Sibling calls don't return, so they don't need to restore r2 */ + if (instruction[-1] == PPC_INST_BRANCH) + return 1; + if (*instruction != PPC_INST_NOP) { pr_err("%s: Expect noop after relocate, got %08x\n", me->name, *instruction); From patchwork Tue Nov 14 09:29:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamalesh Babulal X-Patchwork-Id: 837763 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybj8T2n5pz9s0Z for ; Tue, 14 Nov 2017 20:37:13 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybj8T1xSfzDrSZ for ; Tue, 14 Nov 2017 20:37:13 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=kamalesh@linux.vnet.ibm.com; receiver=) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3ybj2X2ZN1zDqlS for ; Tue, 14 Nov 2017 20:32:04 +1100 (AEDT) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vAE9VOR0025455 for ; Tue, 14 Nov 2017 04:32:01 -0500 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0b-001b2d01.pphosted.com with ESMTP id 2e7wbrsruu-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 14 Nov 2017 04:31:30 -0500 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 14 Nov 2017 09:29:36 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id vAE9TaYG40763550; Tue, 14 Nov 2017 09:29:36 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A6694AE056; Tue, 14 Nov 2017 09:23:02 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 85D9AAE045; Tue, 14 Nov 2017 09:23:01 +0000 (GMT) Received: from localhost.localdomain (unknown [9.40.192.198]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 14 Nov 2017 09:23:01 +0000 (GMT) From: Kamalesh Babulal To: Michael Ellerman Subject: [PATCH v4 3/3] powerpc/modules: Improve restore_r2() error message Date: Tue, 14 Nov 2017 04:29:10 -0500 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20171114092910.20399-1-kamalesh@linux.vnet.ibm.com> References: <20171114092910.20399-1-kamalesh@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17111409-0020-0000-0000-000003CC089D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17111409-0021-0000-0000-00004261379A Message-Id: <20171114092910.20399-4-kamalesh@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-11-14_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1711140129 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, Kamalesh Babulal , Josh Poimboeuf , live-patching@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Josh Poimboeuf Print the function address associated with the restore_r2() error to make it easier to debug the problem. Also clarify the wording a bit. Before: module_64: patch_foo: Expect noop after relocate, got 3c820000 After: module_64: patch_foo: Expected noop after call, got 7c630034 at netdev_has_upper_dev+0x54/0xb0 [patch_foo] Signed-off-by: Josh Poimboeuf Signed-off-by: Kamalesh Babulal --- arch/powerpc/kernel/module_64.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index 9e5391f..dad3ea5 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -494,8 +494,8 @@ static int restore_r2(u32 *instruction, struct module *me) return 1; if (*instruction != PPC_INST_NOP) { - pr_err("%s: Expect noop after relocate, got %08x\n", - me->name, *instruction); + pr_err("%s: Expected noop after call, got %08x at %pS\n", + me->name, *instruction, instruction); return 0; } /* ld r2,R2_STACK_OFFSET(r1) */