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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 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-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Luis Chamberlain , linux-kernel@vger.kernel.org, Nicholas Piggin , Jessica Yu Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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,