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EFI fixes for v6.11 #1

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- Wipe screen_info after allocating it from the heap - used by arm32 and
   EFI zboot, other EFI architectures allocate it statically
 
 - Revert to allocating boot_params from the heap on x86 when entering
   via the native PE entrypoint, to work around a regression on older
   Dell hardware
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Merge tag 'efi-fixes-for-v6.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI fixes from Ard Biesheuvel:

 - Wipe screen_info after allocating it from the heap - used by arm32
   and EFI zboot, other EFI architectures allocate it statically

 - Revert to allocating boot_params from the heap on x86 when entering
   via the native PE entrypoint, to work around a regression on older
   Dell hardware

* tag 'efi-fixes-for-v6.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
  x86/efistub: Revert to heap allocated boot_params for PE entrypoint
  efi/libstub: Zero initialize heap allocated struct screen_info
This commit is contained in:
Linus Torvalds 2024-07-25 12:55:21 -07:00
commit bba959f477
2 changed files with 17 additions and 5 deletions
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2
drivers/firmware/efi/libstub/screen_info.c
View File

@ -32,6 +32,8 @@ struct screen_info *__alloc_screen_info(void)
if (status != EFI_SUCCESS)
return NULL;
memset(si, 0, sizeof(*si));
status = efi_bs_call(install_configuration_table,
&screen_info_guid, si);
if (status == EFI_SUCCESS)

20
drivers/firmware/efi/libstub/x86-stub.c
View File

@ -534,11 +534,12 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_system_table_t *sys_table_arg)
{
static struct boot_params boot_params __page_aligned_bss;
struct setup_header *hdr = &boot_params.hdr;
efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
struct boot_params *boot_params;
struct setup_header *hdr;
int options_size = 0;
efi_status_t status;
unsigned long alloc;
char *cmdline_ptr;
efi_system_table = sys_table_arg;
@ -553,6 +554,13 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_exit(handle, status);
}
status = efi_allocate_pages(PARAM_SIZE, &alloc, ULONG_MAX);
if (status != EFI_SUCCESS)
efi_exit(handle, status);
boot_params = memset((void *)alloc, 0x0, PARAM_SIZE);
hdr = &boot_params->hdr;
/* Assign the setup_header fields that the kernel actually cares about */
hdr->root_flags = 1;
hdr->vid_mode = 0xffff;
@ -562,13 +570,15 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
/* Convert unicode cmdline to ascii */
cmdline_ptr = efi_convert_cmdline(image, &options_size);
if (!cmdline_ptr)
if (!cmdline_ptr) {
efi_free(PARAM_SIZE, alloc);
efi_exit(handle, EFI_OUT_OF_RESOURCES);
}
efi_set_u64_split((unsigned long)cmdline_ptr, &hdr->cmd_line_ptr,
&boot_params.ext_cmd_line_ptr);
&boot_params->ext_cmd_line_ptr);
efi_stub_entry(handle, sys_table_arg, &boot_params);
efi_stub_entry(handle, sys_table_arg, boot_params);
/* not reached */
}