grub2/0004-Rework-linux-command.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Matthew Garrett <mjg59@coreos.com>
Date: Sun, 9 Aug 2015 16:12:39 -0700
Subject: [PATCH] Rework linux command
We want a single buffer that contains the entire kernel image in order to
perform a TPM measurement. Allocate one and copy the entire kernel into it
before pulling out the individual blocks later on.
Signed-off-by: Matthew Garrett <mjg59@coreos.com>
---
grub-core/loader/i386/linux.c | 35 +++++++++++++++++++++++------------
1 file changed, 23 insertions(+), 12 deletions(-)
diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
index 977757f2cc9..10f967f2563 100644
--- a/grub-core/loader/i386/linux.c
+++ b/grub-core/loader/i386/linux.c
@@ -661,13 +661,15 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
{
grub_file_t file = 0;
struct linux_i386_kernel_header lh;
+ grub_uint8_t *linux_params_ptr;
grub_uint8_t setup_sects;
- grub_size_t real_size, prot_size, prot_file_size;
+ grub_size_t real_size, prot_size, prot_file_size, kernel_offset;
grub_ssize_t len;
int i;
grub_size_t align, min_align;
int relocatable;
grub_uint64_t preferred_address = GRUB_LINUX_BZIMAGE_ADDR;
+ grub_uint8_t *kernel = NULL;
grub_dl_ref (my_mod);
@@ -681,7 +683,15 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
if (! file)
goto fail;
- if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
+ len = grub_file_size (file);
+ kernel = grub_malloc (len);
+ if (!kernel)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer"));
+ goto fail;
+ }
+
+ if (grub_file_read (file, kernel, len) != len)
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
@@ -689,6 +699,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
goto fail;
}
+ grub_memcpy (&lh, kernel, sizeof (lh));
+ kernel_offset = sizeof (lh);
+
if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55))
{
grub_error (GRUB_ERR_BAD_OS, "invalid magic number");
@@ -796,13 +809,11 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
/* We've already read lh so there is no need to read it second time. */
len -= sizeof(lh);
- if ((len > 0) &&
- (grub_file_read (file, (char *) &linux_params + sizeof (lh), len) != len))
+ linux_params_ptr = (void *)&linux_params;
+ if (len > 0)
{
- if (!grub_errno)
- grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
- argv[0]);
- goto fail;
+ grub_memcpy (linux_params_ptr + sizeof (lh), kernel + kernel_offset, len);
+ kernel_offset += len;
}
linux_params.code32_start = prot_mode_target + lh.code32_start - GRUB_LINUX_BZIMAGE_ADDR;
@@ -865,7 +876,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
/* The other parameters are filled when booting. */
- grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE);
+ kernel_offset = real_size + GRUB_DISK_SECTOR_SIZE;
grub_dprintf ("linux", "bzImage, setup=0x%x, size=0x%x\n",
(unsigned) real_size, (unsigned) prot_size);
@@ -1019,9 +1030,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
}
len = prot_file_size;
- if (grub_file_read (file, prot_mode_mem, len) != len && !grub_errno)
- grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
- argv[0]);
+ grub_memcpy (prot_mode_mem, kernel + kernel_offset, len);
if (grub_errno == GRUB_ERR_NONE)
{
@@ -1032,6 +1041,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
fail:
+ grub_free (kernel);
+
if (file)
grub_file_close (file);