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GET /api/patches/2218960/?format=api
{ "id": 2218960, "url": "http://patchwork.ozlabs.org/api/patches/2218960/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402072701.628293-7-ruanjinjie@huawei.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260402072701.628293-7-ruanjinjie@huawei.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260402072701.628293-7-ruanjinjie@huawei.com/", "date": "2026-04-02T07:26:52", "name": "[v12,06/15] LoongArch: kexec: Fix potential buffer overflow in prepare_elf_headers()", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "3ce215fe36cdff35d822959628d16ed714593511", "submitter": { "id": 84791, "url": "http://patchwork.ozlabs.org/api/people/84791/?format=api", "name": "Jinjie Ruan", "email": "ruanjinjie@huawei.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402072701.628293-7-ruanjinjie@huawei.com/mbox/", "series": [ { "id": 498443, "url": "http://patchwork.ozlabs.org/api/series/498443/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498443", "date": "2026-04-02T07:26:46", "name": "arm64/riscv: Add support for crashkernel CMA reservation", "version": 12, "mbox": "http://patchwork.ozlabs.org/series/498443/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218960/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218960/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19197-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256\n header.s=dkim header.b=54xcYUdu;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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a=rsa-sha256; d=huawei.com; s=dkim;\n\tc=relaxed/relaxed; q=dns/txt;\n\th=From;\n\tbh=sd1rfkCQX0roc8NJSy9Xy3WAJ3YSwR10tehKBLMeGJM=;\n\tb=54xcYUduJo0UMWYr/pt0k0Np2njxzVf31Sm1XJs4s+8NBJyfujKnT9Yq64qKgE+bNo/t3cxN6\n\taFYtruhAdT+Fghs1MDmCQdvh4RUvSrL77tLPc5dDCVcz4Gi4KWEDN3Q27oDNvVf/LZqqnoAk5Z4\n\t+C2/qr++3q+V2Pz2Q1xKxf0=", "From": "Jinjie Ruan <ruanjinjie@huawei.com>", "To": "<corbet@lwn.net>, <skhan@linuxfoundation.org>, <catalin.marinas@arm.com>,\n\t<will@kernel.org>, <chenhuacai@kernel.org>, <kernel@xen0n.name>,\n\t<maddy@linux.ibm.com>, <mpe@ellerman.id.au>, <npiggin@gmail.com>,\n\t<chleroy@kernel.org>, <pjw@kernel.org>, <palmer@dabbelt.com>,\n\t<aou@eecs.berkeley.edu>, <alex@ghiti.fr>, <tglx@kernel.org>,\n\t<mingo@redhat.com>, <bp@alien8.de>, <dave.hansen@linux.intel.com>,\n\t<hpa@zytor.com>, <robh@kernel.org>, <saravanak@kernel.org>,\n\t<akpm@linux-foundation.org>, <bhe@redhat.com>, <vgoyal@redhat.com>,\n\t<dyoung@redhat.com>, <rdunlap@infradead.org>, <peterz@infradead.org>,\n\t<pawan.kumar.gupta@linux.intel.com>, <feng.tang@linux.alibaba.com>,\n\t<dapeng1.mi@linux.intel.com>, <kees@kernel.org>, <elver@google.com>,\n\t<paulmck@kernel.org>, <lirongqing@baidu.com>, <rppt@kernel.org>,\n\t<leitao@debian.org>, <ardb@kernel.org>, <jbohac@suse.cz>,\n\t<cfsworks@gmail.com>, <tangyouling@kylinos.cn>, <sourabhjain@linux.ibm.com>,\n\t<ritesh.list@gmail.com>, <hbathini@linux.ibm.com>, <eajames@linux.ibm.com>,\n\t<guoren@kernel.org>, <songshuaishuai@tinylab.org>, <kevin.brodsky@arm.com>,\n\t<vishal.moola@gmail.com>, <junhui.liu@pigmoral.tech>, <coxu@redhat.com>,\n\t<fuqiang.wang@easystack.cn>, <liaoyuanhong@vivo.com>,\n\t<takahiro.akashi@linaro.org>, <james.morse@arm.com>, <lizhengyu3@huawei.com>,\n\t<x86@kernel.org>, <linux-doc@vger.kernel.org>,\n\t<linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,\n\t<loongarch@lists.linux.dev>, <linuxppc-dev@lists.ozlabs.org>,\n\t<linux-riscv@lists.infradead.org>, <devicetree@vger.kernel.org>,\n\t<kexec@lists.infradead.org>", "CC": "<ruanjinjie@huawei.com>", "Subject": "[PATCH v12 06/15] LoongArch: kexec: Fix potential buffer overflow in\n prepare_elf_headers()", "Date": "Thu, 2 Apr 2026 15:26:52 +0800", "Message-ID": "<20260402072701.628293-7-ruanjinjie@huawei.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20260402072701.628293-1-ruanjinjie@huawei.com>", "References": "<20260402072701.628293-1-ruanjinjie@huawei.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-Originating-IP": "[10.90.53.73]", "X-ClientProxiedBy": "kwepems100002.china.huawei.com (7.221.188.206) To\n dggpemf500011.china.huawei.com (7.185.36.131)", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "There is a race condition between the kexec_load() system call\n(crash kernel loading path) and memory hotplug operations that can lead\nto buffer overflow and potential kernel crash.\n\nDuring prepare_elf_headers(), the following steps occur:\n1. The first for_each_mem_range() queries current System RAM memory ranges\n2. Allocates buffer based on queried count\n3. The 2st for_each_mem_range() populates ranges from memblock\n\nIf memory hotplug occurs between step 1 and step 3, the number of ranges\ncan increase, causing out-of-bounds write when populating cmem->ranges[].\n\nThis happens because kexec_load() uses kexec_trylock (atomic_t) while\nmemory hotplug uses device_hotplug_lock (mutex), so they don't serialize\nwith each other.\n\nJust add bounds checking to prevent out-of-bounds access.\n\nCc: Youling Tang <tangyouling@kylinos.cn>\nCc: Huacai Chen <chenhuacai@loongson.cn>\nFixes: 1bcca8620a91 (\"LoongArch: Add crash dump support for kexec_file\")\nSigned-off-by: Jinjie Ruan <ruanjinjie@huawei.com>\n---\n arch/loongarch/kernel/machine_kexec_file.c | 5 +++++\n 1 file changed, 5 insertions(+)", "diff": "diff --git a/arch/loongarch/kernel/machine_kexec_file.c b/arch/loongarch/kernel/machine_kexec_file.c\nindex 5584b798ba46..167392c1da33 100644\n--- a/arch/loongarch/kernel/machine_kexec_file.c\n+++ b/arch/loongarch/kernel/machine_kexec_file.c\n@@ -75,6 +75,11 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)\n \tcmem->max_nr_ranges = nr_ranges;\n \tcmem->nr_ranges = 0;\n \tfor_each_mem_range(i, &start, &end) {\n+\t\tif (cmem->nr_ranges >= cmem->max_nr_ranges) {\n+\t\t\tret = -ENOMEM;\n+\t\t\tgoto out;\n+\t\t}\n+\n \t\tcmem->ranges[cmem->nr_ranges].start = start;\n \t\tcmem->ranges[cmem->nr_ranges].end = end - 1;\n \t\tcmem->nr_ranges++;\n", "prefixes": [ "v12", "06/15" ] }