Add a tool that can generate GUIDs that match those generated internally by U-Boot for capsule update fw_images.
Dynamic UUIDs in U-Boot work by taking a namespace UUID and hashing it with the board compatible and fw_image name.
This tool accepts the same inputs and will produce the same GUID as U-Boot would at runtime.
Signed-off-by: Caleb Connolly caleb.connolly@linaro.org --- doc/mkeficapsule.1 | 23 ++++++++ tools/Makefile | 3 + tools/mkeficapsule.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++++-- 3 files changed, 178 insertions(+), 5 deletions(-)
diff --git a/doc/mkeficapsule.1 b/doc/mkeficapsule.1 index c4c2057d5c7a..bf735295effa 100644 --- a/doc/mkeficapsule.1 +++ b/doc/mkeficapsule.1 @@ -9,8 +9,11 @@ mkeficapsule - Generate EFI capsule file for U-Boot .SH SYNOPSIS .B mkeficapsule .RI [ options ] " " [ image-blob ] " " capsule-file
+.B mkeficapsule +.RI guidgen " " [ GUID ] " " DTB " " IMAGE_NAME... + .SH "DESCRIPTION" The .B mkeficapsule command is used to create an EFI capsule file to be used by U-Boot for firmware @@ -41,8 +44,12 @@ format is the same as used in the new uImage format and allows for multiple binary blobs in a single capsule file. This type of image file can be generated by .BR mkimage .
+mkeficapsule can also be used to simulate the dynamic GUID generation used to +identify firmware images in capsule updates by providing the namespace guid, dtb +for the board, and a list of firmware images. + .SH "OPTIONS"
.TP .BI "-g\fR,\fB --guid " guid-string @@ -112,8 +119,24 @@ at every firmware update. .TP .B "-d\fR,\fB --dump_sig" Dump signature data into *.p7 file
+.SH "GUIDGEN OPTIONS" + +.TP +.B "[GUID]" +The namespace/salt GUID, by default this is EFI_CAPSULE_NAMESPACE_GUID. +The format is: + xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx + +.TP +.B DTB +The device tree blob file for the board. + +.TP +.B IMAGE_NAME... +The names of the firmware images to generate GUIDs for. + .PP .SH FILES .TP .I /EFI/UpdateCapsule diff --git a/tools/Makefile b/tools/Makefile index ee08a9675df8..7d1b29943471 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -253,8 +253,11 @@ mkeficapsule-objs := generated/lib/uuid.o \ $(LIBFDT_OBJS) \ mkeficapsule.o hostprogs-$(CONFIG_TOOLS_MKEFICAPSULE) += mkeficapsule
+genguid-objs := generated/lib/uuid.o generated/lib/sha1.o genguid.o +hostprogs-$(CONFIG_TOOLS_GENGUID) += genguid + mkfwumdata-objs := mkfwumdata.o generated/lib/crc32.o HOSTLDLIBS_mkfwumdata += -luuid hostprogs-$(CONFIG_TOOLS_MKFWUMDATA) += mkfwumdata
diff --git a/tools/mkeficapsule.c b/tools/mkeficapsule.c index 54fb4dee3ee5..593380e4236a 100644 --- a/tools/mkeficapsule.c +++ b/tools/mkeficapsule.c @@ -19,12 +19,16 @@ #include <gnutls/gnutls.h> #include <gnutls/pkcs7.h> #include <gnutls/abstract.h>
+#include <libfdt.h> #include <u-boot/uuid.h>
#include "eficapsule.h"
+// Matches CONFIG_EFI_CAPSULE_NAMESPACE_GUID +#define DEFAULT_NAMESPACE_GUID "8c9f137e-91dc-427b-b2d6-b420faebaf2a" + static const char *tool_name = "mkeficapsule";
efi_guid_t efi_guid_fm_capsule = EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID; efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID; @@ -38,8 +42,9 @@ enum { } capsule_type;
static struct option options[] = { {"guid", required_argument, NULL, 'g'}, + {"dtb", required_argument, NULL, 'd'}, {"index", required_argument, NULL, 'i'}, {"instance", required_argument, NULL, 'I'}, {"fw-version", required_argument, NULL, 'v'}, {"private-key", required_argument, NULL, 'p'}, @@ -53,11 +58,23 @@ static struct option options[] = { {"help", no_argument, NULL, 'h'}, {NULL, 0, NULL, 0}, };
-static void print_usage(void) + +static void print_usage_guidgen(void) { - fprintf(stderr, "Usage: %s [options] <image blob> <output file>\n" + fprintf(stderr, "%s guidgen [GUID] DTB IMAGE_NAME...\n" + "Options:\n" + + "\tGUID Namespace GUID (default: %s)\n" + "\tDTB Device Tree Blob\n" + "\tIMAGE_NAME... One or more names of fw_images to generate GUIDs for\n", + tool_name, DEFAULT_NAMESPACE_GUID); +} + +static void print_usage_mkeficapsule(void) +{ + fprintf(stderr, "Usage: \n\n%s [options] <image blob> <output file>\n" "Options:\n"
"\t-g, --guid <guid string> guid for image blob type\n" "\t-i, --index <index> update image index\n" @@ -70,10 +87,11 @@ static void print_usage(void) "\t-A, --fw-accept firmware accept capsule, requires GUID, no image blob\n" "\t-R, --fw-revert firmware revert capsule, takes no GUID, no image blob\n" "\t-o, --capoemflag Capsule OEM Flag, an integer between 0x0000 and 0xffff\n" "\t-D, --dump-capsule dump the contents of the capsule headers\n" - "\t-h, --help print a help message\n", + "\t-h, --help print a help message\n\n", tool_name); + print_usage_guidgen(); }
/** * auth_context - authentication context @@ -816,8 +834,130 @@ static void dump_capsule_contents(char *capsule_file) exit(EXIT_FAILURE); } }
+static struct fdt_header *load_dtb(const char *path) +{ + struct fdt_header *dtb; + ssize_t dtb_size; + FILE *f; + + /* Open and parse DTB */ + f = fopen(path, "r"); + if (!f) { + fprintf(stderr, "Cannot open %s\n", path); + return NULL; + } + + if (fseek(f, 0, SEEK_END)) { + fprintf(stderr, "Cannot seek to the end of %s: %s\n", + path, strerror(errno)); + return NULL; + } + + dtb_size = ftell(f); + if (dtb_size < 0) { + fprintf(stderr, "Cannot ftell %s: %s\n", + path, strerror(errno)); + return NULL; + } + + fseek(f, 0, SEEK_SET); + + dtb = malloc(dtb_size); + if (!dtb) { + fprintf(stderr, "Can't allocated %ld\n", dtb_size); + return NULL; + } + + if (fread(dtb, dtb_size, 1, f) != 1) { + fprintf(stderr, "Can't read %ld bytes from %s\n", + dtb_size, path); + free(dtb); + return NULL; + } + + fclose(f); + + return dtb; +} + +#define MAX_IMAGE_NAME_LEN 128 +static int genguid(int argc, char **argv) +{ + int idx = 2, ret; + unsigned char namespace[16]; + struct efi_guid image_type_id; + const char *dtb_path; + struct fdt_header *dtb; + const char *compatible; + int compatlen, namelen; + uint16_t fw_image[MAX_IMAGE_NAME_LEN]; + + if (argc < 2) { + fprintf(stderr, "Usage: "); + print_usage_guidgen(); + return -1; + } + + if (uuid_str_to_bin(argv[1], namespace, UUID_STR_FORMAT_GUID)) { + uuid_str_to_bin(DEFAULT_NAMESPACE_GUID, namespace, UUID_STR_FORMAT_GUID); + dtb_path = argv[1]; + } else { + dtb_path = argv[2]; + idx = 3; + } + + if (idx == argc) { + fprintf(stderr, "Usage: "); + print_usage_guidgen(); + return -1; + } + + dtb = load_dtb(dtb_path); + if (!dtb) + return -1; + + if ((ret = fdt_check_header(dtb))) { + fprintf(stderr, "Invalid DTB header: %d\n", ret); + return -1; + } + + compatible = fdt_getprop(dtb, 0, "compatible", &compatlen); + if (!compatible) { + fprintf(stderr, "No compatible string found in DTB\n"); + return -1; + } + if (strnlen(compatible, compatlen) >= compatlen) { + fprintf(stderr, "Compatible string not null-terminated\n"); + return -1; + } + + printf("Generating GUIDs for %s with namespace %s:\n", + compatible, DEFAULT_NAMESPACE_GUID); + for (; idx < argc; idx++) { + memset(fw_image, 0, sizeof(fw_image)); + namelen = strlen(argv[idx]); + if (namelen > MAX_IMAGE_NAME_LEN) { + fprintf(stderr, "Image name too long: %s\n", argv[idx]); + return -1; + } + + for (int i = 0; i < namelen; i++) + fw_image[i] = (uint16_t)argv[idx][i]; + + gen_v5_guid((struct uuid *)&namespace, &image_type_id, + compatible, strlen(compatible), + fw_image, namelen * sizeof(uint16_t), + NULL); + + printf("%s: ", argv[idx]); + print_guid(&image_type_id); + } + + return 0; +} + /** * main - main entry function of mkeficapsule * @argc: Number of arguments * @argv: Array of pointers to arguments @@ -840,8 +980,15 @@ int main(int argc, char **argv) char *privkey_file, *cert_file; int c, idx; struct fmp_payload_header_params fmp_ph_params = { 0 };
+ /* Generate dynamic GUIDs */ + if (argc > 1 && !strcmp(argv[1], "guidgen")) { + if (genguid(argc - 1, argv + 1)) + exit(EXIT_FAILURE); + exit(EXIT_SUCCESS); + } + guid = NULL; index = 0; instance = 0; mcount = 0; @@ -928,9 +1075,9 @@ int main(int argc, char **argv) case 'D': capsule_dump = true; break; default: - print_usage(); + print_usage_mkeficapsule(); exit(EXIT_SUCCESS); } }
@@ -951,9 +1098,9 @@ int main(int argc, char **argv) (capsule_type != CAPSULE_NORMAL_BLOB && ((argc != optind + 1) || ((capsule_type == CAPSULE_ACCEPT) && !guid) || ((capsule_type == CAPSULE_REVERT) && guid)))) { - print_usage(); + print_usage_mkeficapsule(); exit(EXIT_FAILURE); }
if (capsule_type != CAPSULE_NORMAL_BLOB) {