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multiboot2: Do not pass memory maps to image if EFI boot services are enabled 

If image requested EFI boot services then skip multiboot2 memory maps.
Main reason for not providing maps is because they will likely be
invalid. We do a few allocations after filling them, e.g. for relocator
needs. Usually we do not care as we would have finished boot services.
If we keep boot services then it is easier/safer to not provide maps.
However, if image needs memory maps and they are not provided by bootloader
then it should get itself just before ExitBootServices() call.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
This commit is contained in:
Daniel Kiper 2015-07-18 00:09:31 +02:00
parent ba89c19f49
commit f2b6c20a25
1 changed files with 35 additions and 36 deletions
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71
grub-core/loader/multiboot_mbi2.c
View File

@ -390,7 +390,7 @@ static grub_size_t
grub_multiboot_get_mbi_size (void)
{
#ifdef GRUB_MACHINE_EFI
if (!efi_mmap_size)
if (!keep_bs && !efi_mmap_size)
find_efi_mmap_size ();
#endif
return 2 * sizeof (grub_uint32_t) + sizeof (struct multiboot_tag)
@ -755,12 +755,13 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
}
}
{
struct multiboot_tag_mmap *tag = (struct multiboot_tag_mmap *) ptrorig;
grub_fill_multiboot_mmap (tag);
ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
/ sizeof (grub_properly_aligned_t);
}
if (!keep_bs)
{
struct multiboot_tag_mmap *tag = (struct multiboot_tag_mmap *) ptrorig;
grub_fill_multiboot_mmap (tag);
ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
/ sizeof (grub_properly_aligned_t);
}
{
struct multiboot_tag_elf_sections *tag
@ -776,18 +777,19 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
/ sizeof (grub_properly_aligned_t);
}
{
struct multiboot_tag_basic_meminfo *tag
= (struct multiboot_tag_basic_meminfo *) ptrorig;
tag->type = MULTIBOOT_TAG_TYPE_BASIC_MEMINFO;
tag->size = sizeof (struct multiboot_tag_basic_meminfo);
if (!keep_bs)
{
struct multiboot_tag_basic_meminfo *tag
= (struct multiboot_tag_basic_meminfo *) ptrorig;
tag->type = MULTIBOOT_TAG_TYPE_BASIC_MEMINFO;
tag->size = sizeof (struct multiboot_tag_basic_meminfo);
/* Convert from bytes to kilobytes. */
tag->mem_lower = grub_mmap_get_lower () / 1024;
tag->mem_upper = grub_mmap_get_upper () / 1024;
ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
/ sizeof (grub_properly_aligned_t);
}
/* Convert from bytes to kilobytes. */
tag->mem_lower = grub_mmap_get_lower () / 1024;
tag->mem_upper = grub_mmap_get_upper () / 1024;
ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
/ sizeof (grub_properly_aligned_t);
}
{
struct grub_net_network_level_interface *net;
@ -886,27 +888,24 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
grub_efi_uintn_t efi_desc_size;
grub_efi_uint32_t efi_desc_version;
tag->type = MULTIBOOT_TAG_TYPE_EFI_MMAP;
tag->size = sizeof (*tag) + efi_mmap_size;
if (!keep_bs)
err = grub_efi_finish_boot_services (&efi_mmap_size, tag->efi_mmap, NULL,
&efi_desc_size, &efi_desc_version);
else
{
if (grub_efi_get_memory_map (&efi_mmap_size, (void *) tag->efi_mmap,
NULL,
&efi_desc_size, &efi_desc_version) <= 0)
err = grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
}
if (err)
return err;
tag->descr_size = efi_desc_size;
tag->descr_vers = efi_desc_version;
tag->size = sizeof (*tag) + efi_mmap_size;
tag->type = MULTIBOOT_TAG_TYPE_EFI_MMAP;
tag->size = sizeof (*tag) + efi_mmap_size;
ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
/ sizeof (grub_properly_aligned_t);
err = grub_efi_finish_boot_services (&efi_mmap_size, tag->efi_mmap, NULL,
&efi_desc_size, &efi_desc_version);
if (err)
return err;
tag->descr_size = efi_desc_size;
tag->descr_vers = efi_desc_version;
tag->size = sizeof (*tag) + efi_mmap_size;
ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
/ sizeof (grub_properly_aligned_t);
}
}
if (keep_bs)