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EFI fixes for v6.7 #2

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- Deal with a regression in the recently refactored x86 EFI stub code on
   older Dell systems by disabling randomization of the physical load
   address
 - Use the correct load address for relocatable Loongarch kernels
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Merge tag 'efi-urgent-for-v6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI fixes from Ard Biesheuvel:

 - Deal with a regression in the recently refactored x86 EFI stub code
   on older Dell systems by disabling randomization of the physical load
   address

 - Use the correct load address for relocatable Loongarch kernels

* tag 'efi-urgent-for-v6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
  efi/x86: Avoid physical KASLR on older Dell systems
  efi/loongarch: Use load address to calculate kernel entry address
This commit is contained in:
Linus Torvalds 2023-12-13 10:54:50 -08:00
commit af2a9c6a83
4 changed files with 30 additions and 13 deletions
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2
arch/loongarch/include/asm/efi.h
View File

@ -32,6 +32,6 @@ static inline unsigned long efi_get_kimg_min_align(void)
#define EFI_KIMG_PREFERRED_ADDRESS PHYSADDR(VMLINUX_LOAD_ADDRESS)
unsigned long kernel_entry_address(void);
unsigned long kernel_entry_address(unsigned long kernel_addr);
#endif /* _ASM_LOONGARCH_EFI_H */

4
drivers/firmware/efi/libstub/loongarch-stub.c
View File

@ -35,9 +35,9 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
return status;
}
unsigned long kernel_entry_address(void)
unsigned long kernel_entry_address(unsigned long kernel_addr)
{
unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
return (unsigned long)&kernel_entry - base + kernel_addr;
}

6
drivers/firmware/efi/libstub/loongarch.c
View File

@ -37,9 +37,9 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
return EFI_SUCCESS;
}
unsigned long __weak kernel_entry_address(void)
unsigned long __weak kernel_entry_address(unsigned long kernel_addr)
{
return *(unsigned long *)(PHYSADDR(VMLINUX_LOAD_ADDRESS) + 8);
return *(unsigned long *)(kernel_addr + 8) - VMLINUX_LOAD_ADDRESS + kernel_addr;
}
efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
@ -73,7 +73,7 @@ efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
real_kernel_entry = (void *)kernel_entry_address();
real_kernel_entry = (void *)kernel_entry_address(kernel_addr);
real_kernel_entry(true, (unsigned long)cmdline_ptr,
(unsigned long)efi_system_table);

31
drivers/firmware/efi/libstub/x86-stub.c
View File

@ -307,17 +307,20 @@ static void setup_unaccepted_memory(void)
efi_err("Memory acceptance protocol failed\n");
}
static efi_char16_t *efistub_fw_vendor(void)
{
unsigned long vendor = efi_table_attr(efi_system_table, fw_vendor);
return (efi_char16_t *)vendor;
}
static const efi_char16_t apple[] = L"Apple";
static void setup_quirks(struct boot_params *boot_params)
{
efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
efi_table_attr(efi_system_table, fw_vendor);
if (!memcmp(fw_vendor, apple, sizeof(apple))) {
if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
retrieve_apple_device_properties(boot_params);
}
if (IS_ENABLED(CONFIG_APPLE_PROPERTIES) &&
!memcmp(efistub_fw_vendor(), apple, sizeof(apple)))
retrieve_apple_device_properties(boot_params);
}
/*
@ -765,11 +768,25 @@ static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size;
static const efi_char16_t ami[] = L"American Megatrends";
efi_get_seed(seed, sizeof(seed));
virt_addr += (range * seed[1]) >> 32;
virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1);
/*
* Older Dell systems with AMI UEFI firmware v2.0 may hang
* while decompressing the kernel if physical address
* randomization is enabled.
*
* https://bugzilla.kernel.org/show_bug.cgi?id=218173
*/
if (efi_system_table->hdr.revision <= EFI_2_00_SYSTEM_TABLE_REVISION &&
!memcmp(efistub_fw_vendor(), ami, sizeof(ami))) {
efi_debug("AMI firmware v2.0 or older detected - disabling physical KASLR\n");
seed[0] = 0;
}
}
status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr,