diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2024-01-25 14:32:07 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2024-03-09 11:37:18 +0100 |
| commit | 9c55461040a9264b7e44444c53d26480b438eda6 (patch) | |
| tree | 87cbfd816dc4a7b9bcae5ae13e0ec2fe0dd745ed /drivers/firmware | |
| parent | d228814b1913444dfdd9a25519ed7b38a19653e2 (diff) | |
x86/efistub: Remap kernel text read-only before dropping NX attribute
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>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/libstub/x86-stub.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c index d09aa13c7ff0..35413c8dfc25 100644 --- a/drivers/firmware/efi/libstub/x86-stub.c +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -236,6 +236,15 @@ 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, @@ -812,7 +821,7 @@ 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, |