bb3473d7c8
Rework TPM measurements to use fewer PCRs. After discussion with upstream, it's preferable to avoid using so many PCRs. Instead, measure into PCRs 8 and 9 but use a prefix in the event log to indicate which subsystem carried out the measurements.
112 lines
2.2 KiB
C
112 lines
2.2 KiB
C
/* cmdline.c - linux command line handling */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/lib/cmdline.h>
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#include <grub/misc.h>
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#include <grub/tpm.h>
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static unsigned int check_arg (char *c, int *has_space)
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{
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int space = 0;
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unsigned int size = 0;
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while (*c)
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{
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if (*c == '\\' || *c == '\'' || *c == '"')
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size++;
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else if (*c == ' ')
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space = 1;
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size++;
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c++;
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}
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if (space)
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size += 2;
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if (has_space)
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*has_space = space;
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return size;
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}
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unsigned int grub_loader_cmdline_size (int argc, char *argv[])
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{
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int i;
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unsigned int size = 0;
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for (i = 0; i < argc; i++)
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{
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size += check_arg (argv[i], 0);
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size++; /* Separator space or NULL. */
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}
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if (size == 0)
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size = 1;
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return size;
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}
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int grub_create_loader_cmdline (int argc, char *argv[], char *buf,
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grub_size_t size)
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{
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int i, space;
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unsigned int arg_size;
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char *c, *orig = buf;
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for (i = 0; i < argc; i++)
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{
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c = argv[i];
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arg_size = check_arg(argv[i], &space);
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arg_size++; /* Separator space or NULL. */
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if (size < arg_size)
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break;
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size -= arg_size;
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if (space)
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*buf++ = '"';
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while (*c)
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{
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if (*c == '\\' || *c == '\'' || *c == '"')
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*buf++ = '\\';
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*buf++ = *c;
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c++;
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}
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if (space)
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*buf++ = '"';
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*buf++ = ' ';
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}
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/* Replace last space with null. */
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if (i)
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buf--;
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*buf = 0;
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grub_tpm_measure ((void *)orig, grub_strlen (orig), GRUB_ASCII_PCR,
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"grub_kernel_cmdline", orig);
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return i;
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}
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