From patchwork Fri Apr 16 04:09:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Daniel Walker (danielwa)" X-Patchwork-Id: 12206667 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1BAB5C433B4 for ; Fri, 16 Apr 2021 04:09:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F1EDA611BF for ; Fri, 16 Apr 2021 04:09:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237782AbhDPEJ4 (ORCPT ); Fri, 16 Apr 2021 00:09:56 -0400 Received: from rcdn-iport-1.cisco.com ([173.37.86.72]:61800 "EHLO rcdn-iport-1.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231896AbhDPEJz (ORCPT ); Fri, 16 Apr 2021 00:09:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8964; q=dns/txt; s=iport; t=1618546171; x=1619755771; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Ie6EtdAViAiALCeFYxNqsCsTGUdiUZbe/6PrULxlkAo=; b=KlpEy3MGC//rWefyf330ol3bK8HrsAF8q8pFjjkkyX/owWO9ggghg83b moN5BZ2hqVxC633tiQWQbtQPHVZ7xBVs/EC47L4Y3ChnGLFAjjvwizfoS TPEmfcsafU2aHPCU2Jl2yKgf4iMPjPKSupoobE9rjWVOnpdzZAIw7OYmE E=; IronPort-HdrOrdr: A9a23:WHWvQ6AC+De4gZnlHejxsceALOonbusQ8zAX/mp6ICY4TuWzkceykPMHkSLugDEKV3063fyGMq+MQXTTnKQFhbU5EL++UGDd1leAA5pl6eLZqQHIOyq7zeJF0LclTq4WMqySMXFfreLXpDa1CMwhxt7vytHMuc77w212RQ9nL4Fshj0ZNi+hHkd7RBZLCPMCffL22uN9qzWtYngRZMigb0N1PdTrncHBl57tfHc9aCIP1Q/mt16VwY+/OwSE2FMkXylXx7A5/Sz+jxXh/am4qZiAu3jh/l6Wy5xXndf7o+EiOOW8zu4INz7rlgGkIKNmVrHqhkFNnMifrHA3jdLLvxAse/5W1kqUVGS0rRzxsjOQtgoT1w== X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A0BMAACIDXlg/4sNJK1aHAEBAQEBAQcBARIBAQQEAQGBfgcBAQsBAYIpgU0BOTGMZ4lOgQyZYoF8CwEBAQ80BAEBhFACgXMCJTQJDgIDAQEMAQEFAQEBAgEGBHEThV1DFgGFawYnCwFGEFFXBgESgnGDCKwHgXgzgQGIM4FEFIElAYhrdIN1JxyBSUKBE4JsdIo5BIFVawUBAXsTQ4FCY5ERi1SBf5wtgxaBJptRDyODTop8ljKVGJ8GMYQrgVQ6gVkzGggbFYMkUBkOjigDFo1rAVshAy84AgYKAQEDCYlOg0ABAQ X-IronPort-AV: E=Sophos;i="5.82,226,1613433600"; d="scan'208";a="876181596" Received: from alln-core-6.cisco.com ([173.36.13.139]) by rcdn-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 16 Apr 2021 04:09:30 +0000 Received: from zorba.cisco.com ([10.24.7.67]) by alln-core-6.cisco.com (8.15.2/8.15.2) with ESMTP id 13G49OHh016753; Fri, 16 Apr 2021 04:09:29 GMT From: Daniel Walker To: Will Deacon , Christophe Leroy , Rob Herring , Daniel Gimpelevich , Andrew Morton , x86@kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: xe-linux-external@cisco.com, linux-kernel@vger.kernel.org Subject: [PATCH 2/8] scripts: insert-sys-cert: add command line insert capability Date: Thu, 15 Apr 2021 21:09:13 -0700 Message-Id: <20210416040924.2882771-3-danielwa@cisco.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210416040924.2882771-1-danielwa@cisco.com> References: <20210416040924.2882771-1-danielwa@cisco.com> MIME-Version: 1.0 X-Auto-Response-Suppress: DR, OOF, AutoReply X-Outbound-SMTP-Client: 10.24.7.67, [10.24.7.67] X-Outbound-Node: alln-core-6.cisco.com Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This adds changes to the insert-sys-cert tool to allow updating the cmdline_prepend and cmdline_append symbols in addition to adding certificates. Updating the cmdline symbols was tested on a PVH virtual machine with a vmlinux, and with a bzImage which was repackaged on x86. This commit intentionally keeps the tool filename the same to allow the changes to be seen more easily. The next commit will change the name of the tool. Cc: xe-linux-external@cisco.com Signed-off-by: Daniel Walker --- scripts/insert-sys-cert.c | 241 +++++++++++++++++++++++++++----------- 1 file changed, 170 insertions(+), 71 deletions(-) diff --git a/scripts/insert-sys-cert.c b/scripts/insert-sys-cert.c index 8902836c2342..77d3306cfbfb 100644 --- a/scripts/insert-sys-cert.c +++ b/scripts/insert-sys-cert.c @@ -30,6 +30,9 @@ #define USED_SYM "system_extra_cert_used" #define LSIZE_SYM "system_certificate_list_size" +#define CMDLINE_APPEND "cmdline_append" +#define CMDLINE_PREPEND "cmdline_prepend" + #define info(format, args...) fprintf(stderr, "INFO: " format, ## args) #define warn(format, args...) fprintf(stdout, "WARNING: " format, ## args) #define err(format, args...) fprintf(stderr, "ERROR: " format, ## args) @@ -267,95 +270,46 @@ static void print_sym(Elf_Ehdr *hdr, struct sym *s) static void print_usage(char *e) { - printf("Usage %s [-s ] -b -c \n", e); + printf("Usage %s [-s ] -b [ -c | -p | -a ]-\n", e); } -int main(int argc, char **argv) +static char *cmdline_prepend, *cmdline_append; +static char *system_map_file; +static char *cert_file; +static char *cli_name; + +static int insert_certificate(Elf_Ehdr *hdr) { - char *system_map_file = NULL; - char *vmlinux_file = NULL; - char *cert_file = NULL; - int vmlinux_size; + struct sym cert_sym, lsize_sym, used_sym; + Elf_Shdr *symtab = NULL; + unsigned long *lsize; + FILE *system_map; int cert_size; - Elf_Ehdr *hdr; char *cert; - FILE *system_map; - unsigned long *lsize; int *used; - int opt; - Elf_Shdr *symtab = NULL; - struct sym cert_sym, lsize_sym, used_sym; - - while ((opt = getopt(argc, argv, "b:c:s:")) != -1) { - switch (opt) { - case 's': - system_map_file = optarg; - break; - case 'b': - vmlinux_file = optarg; - break; - case 'c': - cert_file = optarg; - break; - default: - break; - } - } - if (!vmlinux_file || !cert_file) { - print_usage(argv[0]); - exit(EXIT_FAILURE); + if (!cert_file) { + print_usage(cli_name); + return EXIT_FAILURE; } cert = read_file(cert_file, &cert_size); if (!cert) - exit(EXIT_FAILURE); - - hdr = map_file(vmlinux_file, &vmlinux_size); - if (!hdr) - exit(EXIT_FAILURE); - - if (vmlinux_size < sizeof(*hdr)) { - err("Invalid ELF file.\n"); - exit(EXIT_FAILURE); - } - - if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || - (hdr->e_ident[EI_MAG1] != ELFMAG1) || - (hdr->e_ident[EI_MAG2] != ELFMAG2) || - (hdr->e_ident[EI_MAG3] != ELFMAG3)) { - err("Invalid ELF magic.\n"); - exit(EXIT_FAILURE); - } - - if (hdr->e_ident[EI_CLASS] != CURRENT_ELFCLASS) { - err("ELF class mismatch.\n"); - exit(EXIT_FAILURE); - } - - if (hdr->e_ident[EI_DATA] != endianness()) { - err("ELF endian mismatch.\n"); - exit(EXIT_FAILURE); - } - - if (hdr->e_shoff > vmlinux_size) { - err("Could not find section header.\n"); - exit(EXIT_FAILURE); - } + return EXIT_FAILURE; symtab = get_symbol_table(hdr); if (!symtab) { warn("Could not find the symbol table.\n"); if (!system_map_file) { err("Please provide a System.map file.\n"); - print_usage(argv[0]); - exit(EXIT_FAILURE); + print_usage(cli_name); + return EXIT_FAILURE; } system_map = fopen(system_map_file, "r"); if (!system_map) { perror(system_map_file); - exit(EXIT_FAILURE); + return EXIT_FAILURE; } get_symbol_from_map(hdr, system_map, CERT_SYM, &cert_sym); get_symbol_from_map(hdr, system_map, USED_SYM, &used_sym); @@ -371,7 +325,7 @@ int main(int argc, char **argv) } if (!cert_sym.offset || !lsize_sym.offset || !used_sym.offset) - exit(EXIT_FAILURE); + return EXIT_FAILURE; print_sym(hdr, &cert_sym); print_sym(hdr, &used_sym); @@ -382,14 +336,14 @@ int main(int argc, char **argv) if (cert_sym.size < cert_size) { err("Certificate is larger than the reserved area!\n"); - exit(EXIT_FAILURE); + return EXIT_FAILURE; } /* If the existing cert is the same, don't overwrite */ if (cert_size == *used && strncmp(cert_sym.content, cert, cert_size) == 0) { warn("Certificate was already inserted.\n"); - exit(EXIT_SUCCESS); + return EXIT_SUCCESS; } if (*used > 0) @@ -406,5 +360,150 @@ int main(int argc, char **argv) cert_sym.address); info("Used %d bytes out of %d bytes reserved.\n", *used, cert_sym.size); - exit(EXIT_SUCCESS); + return EXIT_SUCCESS; +} + +static int insert_cmdline(Elf_Ehdr *hdr) +{ + struct sym cmdline_prepend_sym, cmdline_append_sym; + Elf_Shdr *symtab = NULL; + FILE *system_map; + + symtab = get_symbol_table(hdr); + if (!symtab) { + warn("Could not find the symbol table.\n"); + if (!system_map_file) { + err("Please provide a System.map file.\n"); + print_usage(cli_name); + return EXIT_FAILURE; + } + + system_map = fopen(system_map_file, "r"); + if (!system_map) { + perror(system_map_file); + return EXIT_FAILURE; + } + get_symbol_from_map(hdr, system_map, CMDLINE_PREPEND, &cmdline_prepend_sym); + get_symbol_from_map(hdr, system_map, CMDLINE_APPEND, &cmdline_append_sym); + } else { + info("Symbol table found.\n"); + if (system_map_file) + warn("System.map is ignored.\n"); + get_symbol_from_table(hdr, symtab, CMDLINE_PREPEND, &cmdline_prepend_sym); + get_symbol_from_table(hdr, symtab, CMDLINE_APPEND, &cmdline_append_sym); + } + + print_sym(hdr, &cmdline_prepend_sym); + print_sym(hdr, &cmdline_append_sym); + + + if (cmdline_prepend) { + if ((strlen(cmdline_prepend) + 1) > cmdline_prepend_sym.size) { + err("cmdline prepend is larger than the reserved area!\n"); + return EXIT_FAILURE; + } + + memcpy(cmdline_prepend_sym.content, cmdline_prepend, strlen(cmdline_prepend) + 1); + if ((strlen(cmdline_prepend) + 1) < cmdline_prepend_sym.size) + memset(cmdline_prepend_sym.content + strlen(cmdline_prepend) + 1, + 0, cmdline_prepend_sym.size - (strlen(cmdline_prepend) + 1)); + + info("Inserted cmdline prepend of \"%s\" into vmlinux.\n", cmdline_prepend); + + } + if (cmdline_append) { + if ((strlen(cmdline_append) + 1) > cmdline_append_sym.size) { + err("cmdline append is larger than the reserved area!\n"); + return EXIT_FAILURE; + } + + memcpy(cmdline_append_sym.content, cmdline_append, strlen(cmdline_append) + 1); + if ((strlen(cmdline_append) + 1) < cmdline_append_sym.size) + memset(cmdline_append_sym.content + strlen(cmdline_append) + 1, + 0, cmdline_append_sym.size - (strlen(cmdline_append) + 1)); + + info("Inserted cmdline append of \"%s\" into vmlinux.\n", cmdline_append); + + } + return EXIT_SUCCESS; +} + +int main(int argc, char **argv) +{ + char *vmlinux_file = NULL; + int vmlinux_size; + Elf_Ehdr *hdr; + int opt; + int ret = EXIT_SUCCESS; + + while ((opt = getopt(argc, argv, "b:c:s:p:a:")) != -1) { + switch (opt) { + case 's': + system_map_file = optarg; + break; + case 'b': + vmlinux_file = optarg; + break; + case 'c': + cert_file = optarg; + break; + case 'p': + cmdline_prepend = optarg; + break; + case 'a': + cmdline_append = optarg; + break; + default: + break; + } + } + + cli_name = argv[0]; + + if (!vmlinux_file) { + print_usage(cli_name); + exit(EXIT_FAILURE); + } + + hdr = map_file(vmlinux_file, &vmlinux_size); + if (!hdr) + exit(EXIT_FAILURE); + + if (vmlinux_size < sizeof(*hdr)) { + err("Invalid ELF file.\n"); + exit(EXIT_FAILURE); + } + + if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || + (hdr->e_ident[EI_MAG1] != ELFMAG1) || + (hdr->e_ident[EI_MAG2] != ELFMAG2) || + (hdr->e_ident[EI_MAG3] != ELFMAG3)) { + err("Invalid ELF magic.\n"); + exit(EXIT_FAILURE); + } + + if (hdr->e_ident[EI_CLASS] != CURRENT_ELFCLASS) { + err("ELF class mismatch.\n"); + exit(EXIT_FAILURE); + } + + if (hdr->e_ident[EI_DATA] != endianness()) { + err("ELF endian mismatch.\n"); + exit(EXIT_FAILURE); + } + + if (hdr->e_shoff > vmlinux_size) { + err("Could not find section header.\n"); + exit(EXIT_FAILURE); + } + + if (cert_file) { + ret = insert_certificate(hdr); + printf("%s\n", cert_file); + } + + if (cmdline_append || cmdline_prepend) + ret = insert_cmdline(hdr); + + exit(ret); }