{"id":2218960,"url":"http://patchwork.ozlabs.org/api/patches/2218960/?format=json","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=json","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=json","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=json","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 ","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 ","To":", , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, ,\n\t, , ,\n\t, ,\n\t, ,\n\t, ,\n\t, ,\n\t","CC":"","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":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","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 \nCc: Huacai Chen \nFixes: 1bcca8620a91 (\"LoongArch: Add crash dump support for kexec_file\")\nSigned-off-by: Jinjie Ruan \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"]}