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efi/libstub/x86: Permit bootparams struct to be allocated above 4 GB 

We now support bootparams structures that are located in memory that
is not 32-bit addressable, so relax the allocation limit on systems
where this feature is enabled.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-02-10 17:02:39 +01:00
parent a46a290a01
commit 6a4db9bfdd
1 changed files with 6 additions and 1 deletions
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7
drivers/firmware/efi/libstub/x86-stub.c
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@ -363,6 +363,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
char *cmdline_ptr;
unsigned long ramdisk_addr;
unsigned long ramdisk_size;
bool above4g;
sys_table = sys_table_arg;
@ -376,7 +377,11 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
return status;
}
status = efi_low_alloc(0x4000, 1, (unsigned long *)&boot_params);
hdr = &((struct boot_params *)image->image_base)->hdr;
above4g = hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G;
status = efi_allocate_pages(0x4000, (unsigned long *)&boot_params,
above4g ? ULONG_MAX : UINT_MAX);
if (status != EFI_SUCCESS) {
efi_printk("Failed to allocate lowmem for boot params\n");
return status;