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![Simon J. Gerraty](/assets/img/avatar_default.png)
The vectx API, computes the hash for verifying a file as it is read. This avoids the overhead of reading files twice - once to verify, then again to load. For doing an install via loader, avoiding the need to rewind large files is critical. This API is only used for modules, kernel and mdimage as these are the biggest files read by the loader. The reduction in boot time depends on how expensive the I/O is on any given platform. On a fast VM we see 6% improvement. For install via loader the first file to be verified is likely to be the kernel, so some of the prep work (finding manifest etc) done by verify_file() needs to be factored so it can be reused for vectx_open(). For missing or unrecognized fingerprint entries, we fail in vectx_open() unless verifying is disabled. Otherwise fingerprint check happens in vectx_close() and since this API is only used for files which must be verified (VE_MUST) we panic if we get an incorrect hash. Reviewed by: imp,tsoome MFC after: 1 week Sponsored by: Juniper Networks Differential Revision: https://reviews.freebsd.org//D23827
203 lines
4.8 KiB
C
203 lines
4.8 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Simple commandline interpreter, toplevel and misc.
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*/
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#include <stand.h>
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#include <string.h>
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#include "bootstrap.h"
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INTERP_DEFINE("simp");
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void
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interp_init(void)
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{
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setenv("script.lang", "simple", 1);
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/* Read our default configuration. */
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interp_include("/boot/loader.rc");
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}
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int
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interp_run(const char *input)
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{
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int argc;
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char **argv;
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if (parse(&argc, &argv, input)) {
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printf("parse error\n");
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return CMD_ERROR;
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}
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if (interp_builtin_cmd(argc, argv)) {
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printf("%s: %s\n", argv[0], command_errmsg);
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free(argv);
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return CMD_ERROR;
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}
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free(argv);
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return CMD_OK;
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}
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/*
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* Header prepended to each line. The text immediately follows the header.
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* We try to make this short in order to save memory -- the loader has
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* limited memory available, and some of the forth files are very long.
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*/
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struct includeline
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{
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struct includeline *next;
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int flags;
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int line;
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#define SL_QUIET (1<<0)
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#define SL_IGNOREERR (1<<1)
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char text[0];
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};
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int
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interp_include(const char *filename)
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{
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struct includeline *script, *se, *sp;
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char input[256]; /* big enough? */
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int argc,res;
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char **argv, *cp;
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int fd, flags, line;
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if (((fd = open(filename, O_RDONLY)) == -1)) {
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snprintf(command_errbuf, sizeof(command_errbuf),
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"can't open '%s': %s", filename, strerror(errno));
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return(CMD_ERROR);
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}
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#ifdef LOADER_VERIEXEC
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if (verify_file(fd, filename, 0, VE_GUESS, __func__) < 0) {
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close(fd);
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sprintf(command_errbuf,"can't verify '%s'", filename);
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return(CMD_ERROR);
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}
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#endif
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/*
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* Read the script into memory.
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*/
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script = se = NULL;
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line = 0;
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while (fgetstr(input, sizeof(input), fd) >= 0) {
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line++;
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flags = 0;
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/* Discard comments */
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if (strncmp(input+strspn(input, " "), "\\", 1) == 0)
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continue;
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cp = input;
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/* Echo? */
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if (input[0] == '@') {
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cp++;
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flags |= SL_QUIET;
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}
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/* Error OK? */
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if (input[0] == '-') {
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cp++;
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flags |= SL_IGNOREERR;
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}
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/* Allocate script line structure and copy line, flags */
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if (*cp == '\0')
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continue; /* ignore empty line, save memory */
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sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
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/* On malloc failure (it happens!), free as much as possible and exit */
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if (sp == NULL) {
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while (script != NULL) {
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se = script;
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script = script->next;
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free(se);
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}
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snprintf(command_errbuf, sizeof(command_errbuf),
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"file '%s' line %d: memory allocation failure - aborting",
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filename, line);
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close(fd);
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return (CMD_ERROR);
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}
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strcpy(sp->text, cp);
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sp->flags = flags;
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sp->line = line;
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sp->next = NULL;
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if (script == NULL) {
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script = sp;
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} else {
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se->next = sp;
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}
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se = sp;
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}
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close(fd);
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/*
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* Execute the script
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*/
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argv = NULL;
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res = CMD_OK;
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for (sp = script; sp != NULL; sp = sp->next) {
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/* print if not being quiet */
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if (!(sp->flags & SL_QUIET)) {
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interp_emit_prompt();
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printf("%s\n", sp->text);
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}
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/* Parse the command */
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if (!parse(&argc, &argv, sp->text)) {
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if ((argc > 0) && (interp_builtin_cmd(argc, argv) != 0)) {
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/* normal command */
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printf("%s: %s\n", argv[0], command_errmsg);
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if (!(sp->flags & SL_IGNOREERR)) {
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res=CMD_ERROR;
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break;
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}
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}
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free(argv);
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argv = NULL;
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} else {
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printf("%s line %d: parse error\n", filename, sp->line);
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res=CMD_ERROR;
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break;
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}
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}
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if (argv != NULL)
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free(argv);
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while (script != NULL) {
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se = script;
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script = script->next;
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free(se);
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}
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return(res);
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}
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