123 lines
4.6 KiB
Diff
123 lines
4.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
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Date: Tue, 12 Jun 2018 20:04:09 +0200
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Subject: [PATCH] mbi: Use per segment a separate relocator chunk
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Instead of setting up a all comprising relocator chunk for all segments,
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use per segment a separate relocator chunk.
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Currently, if the ELF is non-relocatable, a single relocator chunk will
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comprise memory (between the segments) which gets overridden by the relst()
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invocation of the movers code in grub_relocator16/32/64_boot().
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The overridden memory may contain reserved ranges like VGA memory or ACPI
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tables, which may lead to crashes or at least to strange boot behaviour.
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Signed-off-by: Alexander Boettcher <alexander.boettcher@genode-labs.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/loader/multiboot_elfxx.c | 63 ++++++++++++++++++++++++--------------
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1 file changed, 40 insertions(+), 23 deletions(-)
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diff --git a/grub-core/loader/multiboot_elfxx.c b/grub-core/loader/multiboot_elfxx.c
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index 67daf5944b0..ae36d9d49da 100644
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--- a/grub-core/loader/multiboot_elfxx.c
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+++ b/grub-core/loader/multiboot_elfxx.c
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@@ -57,9 +57,9 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
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char *phdr_base;
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grub_err_t err;
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grub_relocator_chunk_t ch;
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- grub_uint32_t load_offset, load_size;
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+ grub_uint32_t load_offset = 0, load_size;
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int i;
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- void *source;
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+ void *source = NULL;
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if (ehdr->e_ident[EI_MAG0] != ELFMAG0
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|| ehdr->e_ident[EI_MAG1] != ELFMAG1
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@@ -97,10 +97,15 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
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return grub_error (GRUB_ERR_BAD_OS, "segment crosses 4 GiB border");
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#endif
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- load_size = highest_load - mld->link_base_addr;
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-
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if (mld->relocatable)
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{
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+ load_size = highest_load - mld->link_base_addr;
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+
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+ grub_dprintf ("multiboot_loader", "align=0x%lx, preference=0x%x, "
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+ "load_size=0x%x, avoid_efi_boot_services=%d\n",
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+ (long) mld->align, mld->preference, load_size,
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+ mld->avoid_efi_boot_services);
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+
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if (load_size > mld->max_addr || mld->min_addr > mld->max_addr - load_size)
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return grub_error (GRUB_ERR_BAD_OS, "invalid min/max address and/or load size");
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@@ -108,27 +113,22 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
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mld->min_addr, mld->max_addr - load_size,
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load_size, mld->align ? mld->align : 1,
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mld->preference, mld->avoid_efi_boot_services);
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+
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+ if (err)
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+ {
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+ grub_dprintf ("multiboot_loader", "Cannot allocate memory for OS image\n");
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+ return err;
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+ }
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+
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+ mld->load_base_addr = get_physical_target_address (ch);
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+ source = get_virtual_current_address (ch);
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}
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else
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- err = grub_relocator_alloc_chunk_addr (GRUB_MULTIBOOT (relocator), &ch,
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- mld->link_base_addr, load_size);
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+ mld->load_base_addr = mld->link_base_addr;
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- if (err)
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- {
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- grub_dprintf ("multiboot_loader", "Cannot allocate memory for OS image\n");
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- return err;
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- }
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-
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- mld->load_base_addr = get_physical_target_address (ch);
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- source = get_virtual_current_address (ch);
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-
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- grub_dprintf ("multiboot_loader", "link_base_addr=0x%x, load_base_addr=0x%x, "
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- "load_size=0x%x, relocatable=%d\n", mld->link_base_addr,
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- mld->load_base_addr, load_size, mld->relocatable);
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-
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- if (mld->relocatable)
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- grub_dprintf ("multiboot_loader", "align=0x%lx, preference=0x%x, avoid_efi_boot_services=%d\n",
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- (long) mld->align, mld->preference, mld->avoid_efi_boot_services);
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+ grub_dprintf ("multiboot_loader", "relocatable=%d, link_base_addr=0x%x, "
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+ "load_base_addr=0x%x\n", relocatable,
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+ mld->link_base_addr, mld->load_base_addr);
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/* Load every loadable segment in memory. */
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for (i = 0; i < ehdr->e_phnum; i++)
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@@ -139,7 +139,24 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
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grub_dprintf ("multiboot_loader", "segment %d: paddr=0x%lx, memsz=0x%lx, vaddr=0x%lx\n",
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i, (long) phdr(i)->p_paddr, (long) phdr(i)->p_memsz, (long) phdr(i)->p_vaddr);
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- load_offset = phdr(i)->p_paddr - mld->link_base_addr;
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+ if (mld->relocatable)
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+ {
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+ load_offset = phdr(i)->p_paddr - mld->link_base_addr;
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+ grub_dprintf ("multiboot_loader", "segment %d: load_offset=0x%x\n", i, load_offset);
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+ }
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+ else
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+ {
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+ err = grub_relocator_alloc_chunk_addr (GRUB_MULTIBOOT (relocator), &ch,
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+ phdr(i)->p_paddr, phdr(i)->p_memsz);
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+
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+ if (err)
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+ {
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+ grub_dprintf ("multiboot_loader", "Cannot allocate memory for OS image\n");
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+ return err;
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+ }
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+
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+ source = get_virtual_current_address (ch);
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+ }
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if (phdr(i)->p_filesz != 0)
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{
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