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efi: Introduce EFI_NX_PE_DATA bit and set it from properties table

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UEFI v2.5 introduces a runtime memory protection feature that splits
PE/COFF runtime images into separate code and data regions. Since this
may require special handling by the OS, allocate a EFI_xxx bit to
keep track of whether this feature is currently active or not.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Ard Biesheuvel 2015-09-23 07:29:34 -07:00 committed by Matt Fleming
parent bf924863c9
commit a104171334
2 changed files with 19 additions and 0 deletions
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18
drivers/firmware/efi/efi.c
View File

@ -426,6 +426,24 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz,
}
pr_cont("\n");
set_bit(EFI_CONFIG_TABLES, &efi.flags);
/* Parse the EFI Properties table if it exists */
if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
efi_properties_table_t *tbl;
tbl = early_memremap(efi.properties_table, sizeof(*tbl));
if (tbl == NULL) {
pr_err("Could not map Properties table!\n");
return -ENOMEM;
}
if (tbl->memory_protection_attribute &
EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
set_bit(EFI_NX_PE_DATA, &efi.flags);
early_memunmap(tbl, sizeof(*tbl));
}
return 0;
}

1
include/linux/efi.h
View File

@ -973,6 +973,7 @@ extern int __init efi_setup_pcdp_console(char *);
#define EFI_PARAVIRT 6 /* Access is via a paravirt interface */
#define EFI_ARCH_1 7 /* First arch-specific bit */
#define EFI_DBG 8 /* Print additional debug info at runtime */
#define EFI_NX_PE_DATA 9 /* Can runtime data regions be mapped non-executable? */
#ifdef CONFIG_EFI
/*