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Pull request for UEFI sub-system for efi-2020-07-rc4

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This patch series addresses the following issues:
 
 * allow compiling with clang
 * add missing function descriptions to the HTML documentation
 * simplify the validation of UEFI images
 * validate load options in the UEFI boot manager
 
 In a preparatory patch a structure definition is moved.
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Merge tag 'efi-2020-07-rc4' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-07-rc4

This patch series addresses the following issues:

* allow compiling with clang
* add missing function descriptions to the HTML documentation
* simplify the validation of UEFI images
* validate load options in the UEFI boot manager

In a preparatory patch a structure definition is moved.
This commit is contained in:
Tom Rini 2020-06-03 14:10:03 -04:00
commit 1b6ae82a5a
8 changed files with 87 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm/include/asm/global_data.h
View File

@ -117,4 +117,13 @@ static inline gd_t *get_gd(void)
#endif
#endif
static inline void set_gd(volatile gd_t *gd_ptr)
{
#ifdef CONFIG_ARM64
__asm__ volatile("ldr x18, %0\n" : : "m"(gd_ptr));
#else
__asm__ volatile("ldr r9, %0\n" : : "m"(gd_ptr));
#endif
}
#endif /* __ASM_GBL_DATA_H */

21
cmd/efidebug.c
View File

@ -694,14 +694,19 @@ static int do_efi_boot_rm(struct cmd_tbl *cmdtp, int flag,
*
* Decode the value of UEFI load option variable and print information.
*/
static void show_efi_boot_opt_data(u16 *varname16, void *data, size_t size)
static void show_efi_boot_opt_data(u16 *varname16, void *data, size_t *size)
{
struct efi_load_option lo;
char *label, *p;
size_t label_len16, label_len;
u16 *dp_str;
efi_status_t ret;
efi_deserialize_load_option(&lo, data);
ret = efi_deserialize_load_option(&lo, data, size);
if (ret != EFI_SUCCESS) {
printf("%ls: invalid load option\n", varname16);
return;
}
label_len16 = u16_strlen(lo.label);
label_len = utf16_utf8_strnlen(lo.label, label_len16);
@ -728,8 +733,7 @@ static void show_efi_boot_opt_data(u16 *varname16, void *data, size_t size)
printf(" data:\n");
print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1,
lo.optional_data, size + (u8 *)data -
(u8 *)lo.optional_data, true);
lo.optional_data, *size, true);
free(label);
}
@ -759,7 +763,7 @@ static void show_efi_boot_opt(u16 *varname16)
&efi_global_variable_guid,
NULL, &size, data));
if (ret == EFI_SUCCESS)
show_efi_boot_opt_data(varname16, data, size);
show_efi_boot_opt_data(varname16, data, &size);
free(data);
}
}
@ -920,7 +924,12 @@ static int show_efi_boot_order(void)
goto out;
}
efi_deserialize_load_option(&lo, data);
ret = efi_deserialize_load_option(&lo, data, &size);
if (ret != EFI_SUCCESS) {
printf("%ls: invalid load option\n", var_name16);
ret = CMD_RET_FAILURE;
goto out;
}
label_len16 = u16_strlen(lo.label);
label_len = utf16_utf8_strnlen(lo.label, label_len16);

3
include/efi_loader.h
View File

@ -708,7 +708,8 @@ struct efi_load_option {
const u8 *optional_data;
};
void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
efi_uintn_t *size);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
efi_status_t efi_bootmgr_load(efi_handle_t *handle);

46
lib/efi_loader/efi_bootmgr.c
View File

@ -36,24 +36,50 @@ static const struct efi_runtime_services *rs;
*
* @lo: pointer to target
* @data: serialized data
* @size: size of the load option, on return size of the optional data
* Return: status code
*/
void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data)
efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
efi_uintn_t *size)
{
efi_uintn_t len;
len = sizeof(u32);
if (*size < len + 2 * sizeof(u16))
return EFI_INVALID_PARAMETER;
lo->attributes = get_unaligned_le32(data);
data += sizeof(u32);
data += len;
*size -= len;
len = sizeof(u16);
lo->file_path_length = get_unaligned_le16(data);
data += sizeof(u16);
data += len;
*size -= len;
/* FIXME */
lo->label = (u16 *)data;
data += (u16_strlen(lo->label) + 1) * sizeof(u16);
len = u16_strnlen(lo->label, *size / sizeof(u16) - 1);
if (lo->label[len])
return EFI_INVALID_PARAMETER;
len = (len + 1) * sizeof(u16);
if (*size < len)
return EFI_INVALID_PARAMETER;
data += len;
*size -= len;
/* FIXME */
len = lo->file_path_length;
if (*size < len)
return EFI_INVALID_PARAMETER;
lo->file_path = (struct efi_device_path *)data;
data += lo->file_path_length;
/*
* TODO: validate device path. There should be an end node within
* the indicated file_path_length.
*/
data += len;
*size -= len;
lo->optional_data = data;
return EFI_SUCCESS;
}
/**
@ -168,7 +194,11 @@ static efi_status_t try_load_entry(u16 n, efi_handle_t *handle)
if (!load_option)
return EFI_LOAD_ERROR;
efi_deserialize_load_option(&lo, load_option);
ret = efi_deserialize_load_option(&lo, load_option, &size);
if (ret != EFI_SUCCESS) {
log_warning("Invalid load option for %ls\n", varname);
goto error;
}
if (lo.attributes & LOAD_OPTION_ACTIVE) {
u32 attributes;

10
lib/efi_loader/efi_boottime.c
View File

@ -49,7 +49,7 @@ static efi_handle_t current_image;
* restriction so we need to manually swap its and our view of that register on
* EFI callback entry/exit.
*/
static volatile void *efi_gd, *app_gd;
static volatile gd_t *efi_gd, *app_gd;
#endif
/* 1 if inside U-Boot code, 0 if inside EFI payload code */
@ -89,7 +89,7 @@ int __efi_entry_check(void)
#ifdef CONFIG_ARM
assert(efi_gd);
app_gd = gd;
gd = efi_gd;
set_gd(efi_gd);
#endif
return ret;
}
@ -99,7 +99,7 @@ int __efi_exit_check(void)
{
int ret = --entry_count == 0;
#ifdef CONFIG_ARM
gd = app_gd;
set_gd(app_gd);
#endif
return ret;
}
@ -123,7 +123,7 @@ void efi_restore_gd(void)
/* Only restore if we're already in EFI context */
if (!efi_gd)
return;
gd = efi_gd;
set_gd(efi_gd);
#endif
}
@ -2920,7 +2920,7 @@ efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
* otherwise __efi_entry_check() will put the wrong value into
* app_gd.
*/
gd = app_gd;
set_gd(app_gd);
#endif
/*
* To get ready to call EFI_EXIT below we have to execute the

35
lib/efi_loader/efi_image_loader.c
View File

@ -212,14 +212,16 @@ static void efi_set_code_and_data_type(
#ifdef CONFIG_EFI_SECURE_BOOT
/**
* cmp_pe_section - compare two sections
* @arg1: Pointer to pointer to first section
* @arg2: Pointer to pointer to second section
* cmp_pe_section() - compare virtual addresses of two PE image sections
* @arg1: pointer to pointer to first section header
* @arg2: pointer to pointer to second section header
*
* Compare two sections in PE image.
* Compare the virtual addresses of two sections of an portable executable.
* The arguments are defined as const void * to allow usage with qsort().
*
* Return: -1, 0, 1 respectively if arg1 < arg2, arg1 == arg2 or
* arg1 > arg2
* Return: -1 if the virtual address of arg1 is less than that of arg2,
* 0 if the virtual addresses are equal, 1 if the virtual address
* of arg1 is greater than that of arg2.
*/
static int cmp_pe_section(const void *arg1, const void *arg2)
{
@ -237,7 +239,7 @@ static int cmp_pe_section(const void *arg1, const void *arg2)
}
/**
* efi_image_parse - parse a PE image
* efi_image_parse() - parse a PE image
* @efi: Pointer to image
* @len: Size of @efi
* @regp: Pointer to a list of regions
@ -404,7 +406,7 @@ err:
}
/**
* efi_image_unsigned_authenticate - authenticate unsigned image with
* efi_image_unsigned_authenticate() - authenticate unsigned image with
* SHA256 hash
* @regs: List of regions to be verified
*
@ -451,7 +453,7 @@ out:
}
/**
* efi_image_authenticate - verify a signature of signed image
* efi_image_authenticate() - verify a signature of signed image
* @efi: Pointer to image
* @efi_size: Size of @efi
*
@ -635,21 +637,18 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle,
goto err;
}
/* assume sizeof(IMAGE_NT_HEADERS32) <= sizeof(IMAGE_NT_HEADERS64) */
if (efi_size < dos->e_lfanew + sizeof(IMAGE_NT_HEADERS32)) {
/*
* Check if the image section header fits into the file. Knowing that at
* least one section header follows we only need to check for the length
* of the 64bit header which is longer than the 32bit header.
*/
if (efi_size < dos->e_lfanew + sizeof(IMAGE_NT_HEADERS64)) {
printf("%s: Invalid offset for Extended Header\n", __func__);
ret = EFI_LOAD_ERROR;
goto err;
}
nt = (void *) ((char *)efi + dos->e_lfanew);
if ((nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) &&
(efi_size < dos->e_lfanew + sizeof(IMAGE_NT_HEADERS64))) {
printf("%s: Invalid offset for Extended Header\n", __func__);
ret = EFI_LOAD_ERROR;
goto err;
}
if (nt->Signature != IMAGE_NT_SIGNATURE) {
printf("%s: Invalid NT Signature\n", __func__);
ret = EFI_LOAD_ERROR;

1
lib/efi_loader/efi_signature.c
View File

@ -22,6 +22,7 @@ const efi_guid_t efi_guid_sha256 = EFI_CERT_SHA256_GUID;
const efi_guid_t efi_guid_cert_rsa2048 = EFI_CERT_RSA2048_GUID;
const efi_guid_t efi_guid_cert_x509 = EFI_CERT_X509_GUID;
const efi_guid_t efi_guid_cert_x509_sha256 = EFI_CERT_X509_SHA256_GUID;
const efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
#ifdef CONFIG_EFI_SECURE_BOOT

1
lib/efi_loader/efi_variable.c
View File

@ -26,7 +26,6 @@ enum efi_secure_mode {
EFI_MODE_DEPLOYED,
};
const efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
static bool efi_secure_boot;
static int efi_secure_mode;
static u8 efi_vendor_keys;