On Fri, Aug 26, 2022 at 03:27:14PM +0530, Sughosh Ganu wrote: > The Dependable Boot specification[1] describes the structure of the > firmware accept and revert capsules. These are empty capsules which > are used for signalling the acceptance or rejection of the updated > firmware by the OS. Add support for generating these empty capsules. > > [1] - > https://git.codelinaro.org/linaro/dependable-boot/mbfw/uploads/6f7ddfe3be24e18d4319e108a758d02e/mbfw.pdf > > Signed-off-by: Sughosh Ganu <sughosh.g...@linaro.org> > --- > Changes since V8: None > > doc/mkeficapsule.1 | 29 +++++++++---- > tools/eficapsule.h | 8 ++++ > tools/mkeficapsule.c | 96 ++++++++++++++++++++++++++++++++++++++++---- > 3 files changed, 119 insertions(+), 14 deletions(-) > > diff --git a/doc/mkeficapsule.1 b/doc/mkeficapsule.1 > index 09bdc24295..77ca061efd 100644 > --- a/doc/mkeficapsule.1 > +++ b/doc/mkeficapsule.1 > @@ -8,7 +8,7 @@ mkeficapsule \- Generate EFI capsule file for U-Boot > > .SH SYNOPSIS > .B mkeficapsule > -.RI [ options "] " image-blob " " capsule-file > +.RI [ options ] " " [ image-blob ] " " capsule-file > > .SH "DESCRIPTION" > .B mkeficapsule > @@ -23,8 +23,13 @@ Optionally, a capsule file can be signed with a given > private key. > In this case, the update will be authenticated by verifying the signature > before applying. > > +Additionally, an empty capsule file can be generated for acceptance or > +rejection of firmware images by a governing component like an Operating > +System. The empty capsules do not require an image-blob input file. > + > + > .B mkeficapsule > -takes any type of image files, including: > +takes any type of image files when generating non empty capsules, including: > .TP > .I raw image > format is a single binary blob of any type of firmware. > @@ -36,18 +41,16 @@ multiple binary blobs in a single capsule file. > This type of image file can be generated by > .BR mkimage . > > -.PP > -If you want to use other types than above two, you should explicitly > -specify a guid for the FMP driver. > - > .SH "OPTIONS" > + > .TP > .BI "-g\fR,\fB --guid " guid-string > Specify guid for image blob type. The format is: > xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx > > The first three elements are in little endian, while the rest > -is in big endian. > +is in big endian. The option must be specified for all non empty and > +image acceptance capsules > > .TP > .BI "-i\fR,\fB --index " index > @@ -57,6 +60,18 @@ Specify an image index > .BI "-I\fR,\fB --instance " instance > Specify a hardware instance > > +.PP > +For generation of firmware accept empty capsule > +.BR --guid > +is mandatory > +.TP > +.BI "-A\fR,\fB --fw-accept " > +Generate a firmware acceptance empty capsule > + > +.TP > +.BI "-R\fR,\fB --fw-revert " > +Generate a firmware revert empty capsule > + > .TP > .BR -h ", " --help > Print a help message > diff --git a/tools/eficapsule.h b/tools/eficapsule.h > index d63b831443..072a4b5598 100644 > --- a/tools/eficapsule.h > +++ b/tools/eficapsule.h > @@ -41,6 +41,14 @@ typedef struct { > EFI_GUID(0x4aafd29d, 0x68df, 0x49ee, 0x8a, 0xa9, \ > 0x34, 0x7d, 0x37, 0x56, 0x65, 0xa7) > > +#define FW_ACCEPT_OS_GUID \ > + EFI_GUID(0x0c996046, 0xbcc0, 0x4d04, 0x85, 0xec, \ > + 0xe1, 0xfc, 0xed, 0xf1, 0xc6, 0xf8) > + > +#define FW_REVERT_OS_GUID \ > + EFI_GUID(0xacd58b4b, 0xc0e8, 0x475f, 0x99, 0xb5, \ > + 0x6b, 0x3f, 0x7e, 0x07, 0xaa, 0xf0) > + > /* flags */ > #define CAPSULE_FLAGS_PERSIST_ACROSS_RESET 0x00010000 > > diff --git a/tools/mkeficapsule.c b/tools/mkeficapsule.c > index 5f74d23b9e..25bfb39e5b 100644 > --- a/tools/mkeficapsule.c > +++ b/tools/mkeficapsule.c > @@ -29,7 +29,13 @@ 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; > > -static const char *opts_short = "g:i:I:v:p:c:m:dh"; > +static const char *opts_short = "g:i:I:v:p:c:m:dhAR"; > + > +enum { > + CAPSULE_NORMAL_BLOB = 0, > + CAPSULE_ACCEPT, > + CAPSULE_REVERT, > +} capsule_type; > > static struct option options[] = { > {"guid", required_argument, NULL, 'g'}, > @@ -39,6 +45,8 @@ static struct option options[] = { > {"certificate", required_argument, NULL, 'c'}, > {"monotonic-count", required_argument, NULL, 'm'}, > {"dump-sig", no_argument, NULL, 'd'}, > + {"fw-accept", no_argument, NULL, 'A'}, > + {"fw-revert", no_argument, NULL, 'R'}, > {"help", no_argument, NULL, 'h'}, > {NULL, 0, NULL, 0}, > }; > @@ -55,6 +63,8 @@ static void print_usage(void) > "\t-c, --certificate <cert file> signer's certificate > file\n" > "\t-m, --monotonic-count <count> monotonic count\n" > "\t-d, --dump_sig dump signature (*.p7)\n" > + "\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-h, --help print a help message\n", > tool_name); > } > @@ -564,6 +574,49 @@ void convert_uuid_to_guid(unsigned char *buf) > buf[7] = c; > } > > +static int create_empty_capsule(char *path, efi_guid_t *guid, bool fw_accept) > +{ > + struct efi_capsule_header header = { 0 }; > + FILE *f = NULL; > + int ret = -1; > + efi_guid_t fw_accept_guid = FW_ACCEPT_OS_GUID; > + efi_guid_t fw_revert_guid = FW_REVERT_OS_GUID; > + efi_guid_t capsule_guid; > + > + f = fopen(path, "w"); > + if (!f) { > + fprintf(stderr, "cannot open %s\n", path); > + goto err; > + } > + > + capsule_guid = fw_accept ? fw_accept_guid : fw_revert_guid; > + > + memcpy(&header.capsule_guid, &capsule_guid, sizeof(efi_guid_t)); > + header.header_size = sizeof(header); > + header.flags = 0; > + > + header.capsule_image_size = fw_accept ? > + sizeof(header) + sizeof(efi_guid_t) : sizeof(header); > + > + if (write_capsule_file(f, &header, sizeof(header), > + "Capsule header")) > + goto err; > + > + if (fw_accept) { > + if (write_capsule_file(f, guid, sizeof(*guid), > + "FW Accept Capsule Payload")) > + goto err; > + } > + > + ret = 0; > + > +err: > + if (f) > + fclose(f); > + > + return ret; > +} > + > /** > * main - main entry function of mkeficapsule > * @argc: Number of arguments > @@ -592,6 +645,7 @@ int main(int argc, char **argv) > privkey_file = NULL; > cert_file = NULL; > dump_sig = 0; > + capsule_type = CAPSULE_NORMAL_BLOB; > for (;;) { > c = getopt_long(argc, argv, opts_short, options, &idx); > if (c == -1) > @@ -639,22 +693,50 @@ int main(int argc, char **argv) > case 'd': > dump_sig = 1; > break; > - case 'h': > + case 'A': > + if (capsule_type) { > + fprintf(stderr, > + "Select either of Accept or Revert > capsule generation\n"); > + exit(1); > + } > + capsule_type = CAPSULE_ACCEPT; > + break; > + case 'R': > + if (capsule_type) { > + fprintf(stderr, > + "Select either of Accept or Revert > capsule generation\n"); > + exit(1); > + } > + capsule_type = CAPSULE_REVERT; > + break; > + default: > print_usage(); > exit(EXIT_SUCCESS); > } > } > > /* check necessary parameters */ > - if ((argc != optind + 2) || !guid || > - ((privkey_file && !cert_file) || > - (!privkey_file && cert_file))) { > + if ((capsule_type == CAPSULE_NORMAL_BLOB && > + ((argc != optind + 2) || !guid || > + ((privkey_file && !cert_file) || > + (!privkey_file && cert_file)))) || > + (capsule_type != CAPSULE_NORMAL_BLOB && > + ((argc != optind + 1) || > + ((capsule_type == CAPSULE_ACCEPT) && !guid) || > + ((capsule_type == CAPSULE_REVERT) && guid)))) { > print_usage(); > exit(EXIT_FAILURE); > } > > - if (create_fwbin(argv[argc - 1], argv[argc - 2], guid, index, instance, > - mcount, privkey_file, cert_file) < 0) { > + if (capsule_type != CAPSULE_NORMAL_BLOB) { > + if (create_empty_capsule(argv[argc - 1], guid, > + capsule_type == CAPSULE_ACCEPT) < 0) { > + fprintf(stderr, "Creating empty capsule failed\n"); > + exit(EXIT_FAILURE); > + } > + } else if (create_fwbin(argv[argc - 1], argv[argc - 2], guid, > + index, instance, mcount, privkey_file, > + cert_file) < 0) { > fprintf(stderr, "Creating firmware capsule failed\n"); > exit(EXIT_FAILURE); > } > -- > 2.34.1 > Acked-by: Ilias Apalodimas <ilias.apalodi...@linaro.org>
