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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Matthew Garrett <mjg59@srcf.ucam.org>
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Date: Mon, 10 Aug 2015 15:27:12 -0700
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Subject: [PATCH] Measure commands
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Measure each command executed by grub, which includes script execution.
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---
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grub-core/script/execute.c | 25 +++++++++++++++++++++++--
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include/grub/tpm.h | 1 +
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2 files changed, 24 insertions(+), 2 deletions(-)
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diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
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index cf6cd6601..9ae04a051 100644
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--- a/grub-core/script/execute.c
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+++ b/grub-core/script/execute.c
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@@ -30,6 +30,7 @@
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#ifdef GRUB_MACHINE_IEEE1275
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#include <grub/ieee1275/ieee1275.h>
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#endif
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+#include <grub/tpm.h>
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/* Max digits for a char is 3 (0xFF is 255), similarly for an int it
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is sizeof (int) * 3, and one extra for a possible -ve sign. */
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@@ -967,8 +968,9 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
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grub_err_t ret = 0;
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grub_script_function_t func = 0;
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char errnobuf[18];
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- char *cmdname;
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- int argc;
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+ char *cmdname, *cmdstring;
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+ int argc, offset = 0, cmdlen = 0;
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+ unsigned int i;
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char **args;
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int invert;
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struct grub_script_argv argv = { 0, 0, 0 };
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@@ -977,6 +979,25 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
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if (grub_script_arglist_to_argv (cmdline->arglist, &argv) || ! argv.args[0])
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return grub_errno;
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+ for (i = 0; i < argv.argc; i++) {
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+ cmdlen += grub_strlen (argv.args[i]) + 1;
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+ }
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+
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+ cmdstring = grub_malloc (cmdlen);
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+ if (!cmdstring)
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+ {
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+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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+ N_("cannot allocate command buffer"));
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+ }
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+
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+ for (i = 0; i < argv.argc; i++) {
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+ offset += grub_snprintf (cmdstring + offset, cmdlen - offset, "%s ",
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+ argv.args[i]);
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+ }
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+ cmdstring[cmdlen-1]= '\0';
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+ grub_tpm_measure ((unsigned char *)cmdstring, cmdlen, GRUB_COMMAND_PCR,
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+ cmdstring);
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+ grub_free(cmdstring);
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invert = 0;
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argc = argv.argc - 1;
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args = argv.args + 1;
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diff --git a/include/grub/tpm.h b/include/grub/tpm.h
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index 40d3cf65b..7fc9d77d2 100644
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--- a/include/grub/tpm.h
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+++ b/include/grub/tpm.h
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@@ -30,6 +30,7 @@
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#define GRUB_KERNEL_PCR 10
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#define GRUB_INITRD_PCR 11
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#define GRUB_CMDLINE_PCR 12
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+#define GRUB_COMMAND_PCR 13
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#define TPM_TAG_RQU_COMMAND 0x00C1
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#define TPM_ORD_Extend 0x14
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