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[193.116.106.251]) by smtp.gmail.com with ESMTPSA id p17-20020a170902e75100b0017e64da44c5sm1595134plf.203.2022.10.31.05.07.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 05:07:48 -0700 (PDT) From: Nicholas Piggin To: linux-modules@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: Nicholas Piggin , linux-kernel@vger.kernel.org, Michael Ellerman , Jessica Yu , Luis Chamberlain Subject: [PATCH v5 1/2] module: add module_elf_check_arch for module-specific checks Date: Mon, 31 Oct 2022 22:07:32 +1000 Message-Id: <20221031120733.3956781-2-npiggin@gmail.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20221031120733.3956781-1-npiggin@gmail.com> References: <20221031120733.3956781-1-npiggin@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748205239671340159?= X-GMAIL-MSGID: =?utf-8?q?1748205239671340159?= The elf_check_arch() function is also used to test compatibility of usermode binaries. Kernel modules may have more specific requirements, for example powerpc would like to test for ABI version compatibility. Add a weak module_elf_check_arch() that defaults to true, and call it from elf_validity_check(). Cc: Michael Ellerman Signed-off-by: Jessica Yu [np: added changelog, adjust name, rebase] Signed-off-by: Nicholas Piggin Acked-by: Luis Chamberlain --- include/linux/moduleloader.h | 3 +++ kernel/module/main.c | 10 ++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h index 9e09d11ffe5b..7b4587a19189 100644 --- a/include/linux/moduleloader.h +++ b/include/linux/moduleloader.h @@ -13,6 +13,9 @@ * must be implemented by each architecture. */ +/* arch may override to do additional checking of ELF header architecture */ +bool module_elf_check_arch(Elf_Ehdr *hdr); + /* Adjust arch-specific sections. Return 0 on success. */ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, diff --git a/kernel/module/main.c b/kernel/module/main.c index d02d39c7174e..7b3f6fb0d428 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1674,6 +1674,11 @@ static int elf_validity_check(struct load_info *info) info->hdr->e_machine); goto no_exec; } + if (!module_elf_check_arch(info->hdr)) { + pr_err("Invalid module architecture in ELF header: %u\n", + info->hdr->e_machine); + goto no_exec; + } if (info->hdr->e_shentsize != sizeof(Elf_Shdr)) { pr_err("Invalid ELF section header size\n"); goto no_exec; @@ -2247,6 +2252,11 @@ static void flush_module_icache(const struct module *mod) (unsigned long)mod->core_layout.base + mod->core_layout.size); } +bool __weak module_elf_check_arch(Elf_Ehdr *hdr) +{ + return true; +} + int __weak module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, From patchwork Mon Oct 31 12:07:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 13252 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp2276569wru; Mon, 31 Oct 2022 05:16:09 -0700 (PDT) X-Google-Smtp-Source: AMsMyM5M2FOa9/oulovYRxHYy14s+FKDwH2XSGyt//kkst3CChLphXdz3efBTEvoph7y63Pe3+jy X-Received: by 2002:a17:907:25c9:b0:77b:a343:bd62 with SMTP id ae9-20020a17090725c900b0077ba343bd62mr13407422ejc.660.1667218569656; Mon, 31 Oct 2022 05:16:09 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1667218569; cv=none; d=google.com; s=arc-20160816; b=EqKsHyvXl88kzqHesPNNgrwRJXE4Ot+F6LAovkJnLQbe+K+RPrqsENKa3CgKN9vG+D yFKAtvtsDfRXmlflDoZh42vW4G/u4ehJmDuoSd6U9Z5cZxFQriDZ/6V4JrDzCcq5PaTy Jx74Tpy4ZrZncM+7NpHXAV6bpwAwVGvOtxwY5FosNJ19HiChzPpU2eQ++dwZ7HJTGxu9 9nmuIUHOkEMsiNWq8FuKQAiiZjUbkbcbq71QdiZRLJOP6IwEPlGnTVabIKgdHKoijNfk PEXGVs2CLYQ+F8nXl8ELkILx1/L92ZsaEeuoiIVZALurS59mS/bYC28x8y9a7bfM7FQI fHTQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=1zed+8ilXn6MGIJcL2z90P1TobfWQ+njImejMWMmf58=; b=dqwBJq9wubw/ntLlX4UhYaKuvt1MhKT3gtCUs0svU/2cT+eywGPDc5L4hsU5OW/kS7 LdaiqQucz4mrqb/qpHtrO3JkuVZpdmzdFAF25xHJn6VHSBLqZmT5DbsvU5vDNPv7iMOC 0/cEatV3ahrVkkbdqLTo2zQpP8OToi7EXzVnsbRecaKTML36bRA06wTZBGNIofN7cgqf 3xds1jP1S+cHQxu2hpQzB7L71ezMUIoeBXzo+vdgA+u5zJAg28dnGWak7FlqxKA9yZ30 vAeJR/GoeA69Z1Lwi38utcQuP2x3uvgPdaDHsVJoy4mgaNxHy+dGJlz54kqFMR+kkCSx 08vw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=VBJYqllw; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (out1.vger.email. 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[193.116.106.251]) by smtp.gmail.com with ESMTPSA id p17-20020a170902e75100b0017e64da44c5sm1595134plf.203.2022.10.31.05.07.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 05:07:52 -0700 (PDT) From: Nicholas Piggin To: linux-modules@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: Nicholas Piggin , linux-kernel@vger.kernel.org, Michael Ellerman , Jessica Yu , Luis Chamberlain Subject: [PATCH v5 2/2] powerpc/64: Add module check for ELF ABI version Date: Mon, 31 Oct 2022 22:07:33 +1000 Message-Id: <20221031120733.3956781-3-npiggin@gmail.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20221031120733.3956781-1-npiggin@gmail.com> References: <20221031120733.3956781-1-npiggin@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748205378913775998?= X-GMAIL-MSGID: =?utf-8?q?1748205378913775998?= Override the generic module ELF check to provide a check for the ELF ABI version. This becomes important if we allow big-endian ELF ABI V2 builds but it doesn't hurt to check now. Cc: Jessica Yu Signed-off-by: Michael Ellerman [np: split patch, added changelog, adjust to Jessica's proposal] Signed-off-by: Nicholas Piggin --- arch/powerpc/kernel/module.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c index f6d6ae0a1692..d46bf9bfda26 100644 --- a/arch/powerpc/kernel/module.c +++ b/arch/powerpc/kernel/module.c @@ -19,6 +19,23 @@ static LIST_HEAD(module_bug_list); +#ifdef CONFIG_PPC64 +bool module_elf_check_arch(Elf_Ehdr *hdr) +{ + unsigned long abi_level = hdr->e_flags & 0x3; + + if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2)) { + if (abi_level != 2) + return false; + } else { + if (abi_level >= 2) + return false; + } + + return true; +} +#endif + static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, const char *name)