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x86/efistub: Remap kernel text read-only before dropping NX attribute 

commit 9c55461040 upstream.

Currently, the EFI stub invokes the EFI memory attributes protocol to
strip any NX restrictions from the entire loaded kernel, resulting in
all code and data being mapped read-write-execute.

The point of the EFI memory attributes protocol is to remove the need
for all memory allocations to be mapped with both write and execute
permissions by default, and make it the OS loader's responsibility to
transition data mappings to code mappings where appropriate.

Even though the UEFI specification does not appear to leave room for
denying memory attribute changes based on security policy, let's be
cautious and avoid relying on the ability to create read-write-execute
mappings. This is trivially achievable, given that the amount of kernel
code executing via the firmware's 1:1 mapping is rather small and
limited to the .head.text region. So let's drop the NX restrictions only
on that subregion, but not before remapping it as read-only first.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ard Biesheuvel 2024-01-25 14:32:07 +01:00 committed by Greg Kroah-Hartman
parent 4947db8687
commit 70a2425a13
4 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/boot/compressed/Makefile
View File

@ -84,7 +84,7 @@ LDFLAGS_vmlinux += -T
hostprogs := mkpiggy
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__start_rodata\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
quiet_cmd_voffset = VOFFSET $@
cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@

1
arch/x86/boot/compressed/misc.c
View File

@ -330,6 +330,7 @@ static size_t parse_elf(void *output)
return ehdr.e_entry - LOAD_PHYSICAL_ADDR;
}
const unsigned long kernel_text_size = VO___start_rodata - VO__text;
const unsigned long kernel_total_size = VO__end - VO__text;
static u8 boot_heap[BOOT_HEAP_SIZE] __aligned(4);

1
arch/x86/include/asm/boot.h
View File

@ -81,6 +81,7 @@
#ifndef __ASSEMBLY__
extern unsigned int output_len;
extern const unsigned long kernel_text_size;
extern const unsigned long kernel_total_size;
unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr,

11
drivers/firmware/efi/libstub/x86-stub.c
View File

@ -238,6 +238,15 @@ efi_status_t efi_adjust_memory_range_protection(unsigned long start,
rounded_end = roundup(start + size, EFI_PAGE_SIZE);
if (memattr != NULL) {
status = efi_call_proto(memattr, set_memory_attributes,
rounded_start,
rounded_end - rounded_start,
EFI_MEMORY_RO);
if (status != EFI_SUCCESS) {
efi_warn("Failed to set EFI_MEMORY_RO attribute\n");
return status;
}
status = efi_call_proto(memattr, clear_memory_attributes,
rounded_start,
rounded_end - rounded_start,
@ -818,7 +827,7 @@ static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
*kernel_entry = addr + entry;
return efi_adjust_memory_range_protection(addr, kernel_total_size);
return efi_adjust_memory_range_protection(addr, kernel_text_size);
}
static void __noreturn enter_kernel(unsigned long kernel_addr,