grub2/SOURCES/0132-Measure-commands.patch

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2021-02-12 08:18:34 +00:00
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Matthew Garrett <mjg59@srcf.ucam.org>
Date: Mon, 10 Aug 2015 15:27:12 -0700
Subject: [PATCH] Measure commands
Measure each command executed by grub, which includes script execution.
---
grub-core/script/execute.c | 25 +++++++++++++++++++++++--
include/grub/tpm.h | 1 +
2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index cf6cd6601d6..9ae04a05160 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -30,6 +30,7 @@
#ifdef GRUB_MACHINE_IEEE1275
#include <grub/ieee1275/ieee1275.h>
#endif
+#include <grub/tpm.h>
/* Max digits for a char is 3 (0xFF is 255), similarly for an int it
is sizeof (int) * 3, and one extra for a possible -ve sign. */
@@ -967,8 +968,9 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
grub_err_t ret = 0;
grub_script_function_t func = 0;
char errnobuf[18];
- char *cmdname;
- int argc;
+ char *cmdname, *cmdstring;
+ int argc, offset = 0, cmdlen = 0;
+ unsigned int i;
char **args;
int invert;
struct grub_script_argv argv = { 0, 0, 0 };
@@ -977,6 +979,25 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
if (grub_script_arglist_to_argv (cmdline->arglist, &argv) || ! argv.args[0])
return grub_errno;
+ for (i = 0; i < argv.argc; i++) {
+ cmdlen += grub_strlen (argv.args[i]) + 1;
+ }
+
+ cmdstring = grub_malloc (cmdlen);
+ if (!cmdstring)
+ {
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ N_("cannot allocate command buffer"));
+ }
+
+ for (i = 0; i < argv.argc; i++) {
+ offset += grub_snprintf (cmdstring + offset, cmdlen - offset, "%s ",
+ argv.args[i]);
+ }
+ cmdstring[cmdlen-1]= '\0';
+ grub_tpm_measure ((unsigned char *)cmdstring, cmdlen, GRUB_COMMAND_PCR,
+ cmdstring);
+ grub_free(cmdstring);
invert = 0;
argc = argv.argc - 1;
args = argv.args + 1;
diff --git a/include/grub/tpm.h b/include/grub/tpm.h
index 40d3cf65ba6..7fc9d77d277 100644
--- a/include/grub/tpm.h
+++ b/include/grub/tpm.h
@@ -30,6 +30,7 @@
#define GRUB_KERNEL_PCR 10
#define GRUB_INITRD_PCR 11
#define GRUB_CMDLINE_PCR 12
+#define GRUB_COMMAND_PCR 13
#define TPM_TAG_RQU_COMMAND 0x00C1
#define TPM_ORD_Extend 0x14