On Wed, 09 Sep, at 10:08:16AM, Ard Biesheuvel wrote:
> 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 <[email protected]>
> ---
> drivers/firmware/efi/efi.c | 15 +++++++++++++++
> include/linux/efi.h | 1 +
> 2 files changed, 16 insertions(+)
The design looks fine just some very minor stylistic changes.
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 5cbb8d31da33..8befd0b53472 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -425,6 +425,21 @@ 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 */
Capital 'P', please.
> + if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
> + efi_properties_table_t *tbl;
> +
> + tbl = early_memremap(efi.properties_table, sizeof (*tbl));
No space between sizeof and '(', please.
> + if (tbl == NULL) {
> + pr_err("Could not map Properties table!\n");
> + return -ENOMEM;
> + }
Insert a newline here.
> + if (tbl->memory_protection_attribute &
> +
> EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
> + set_bit(EFI_NX_PE_DATA, &efi.flags);
Insert a newline here.
> + early_memunmap(tbl, sizeof(*tbl));
> + }
Insert a newline here.
> return 0;
> }
>
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 5b4f3ac08053..4f2ab71e1b8a 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -972,6 +972,7 @@ 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 /* whether PE/COFF images are
> split */
How about "Can runtime data regions be mapped non-executable?"
--
Matt Fleming, Intel Open Source Technology Center
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