Add support for the TPM2_Clear command.
Change the command file and the help accordingly.
Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Reviewed-by: Simon Glass sjg@chromium.org --- cmd/tpm-v2.c | 29 +++++++++++++++++++++++++++++ include/tpm-v2.h | 11 +++++++++++ lib/tpm-v2.c | 35 +++++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+)
diff --git a/cmd/tpm-v2.c b/cmd/tpm-v2.c index 1e746a7f09..9f6a8fc0b6 100644 --- a/cmd/tpm-v2.c +++ b/cmd/tpm-v2.c @@ -51,11 +51,35 @@ static int do_tpm2_self_test(cmd_tbl_t *cmdtp, int flag, int argc, return report_return_code(tpm2_self_test(full_test)); }
+static int do_tpm2_clear(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + u32 handle = 0; + const char *pw = (argc < 3) ? NULL : argv[2]; + const ssize_t pw_sz = pw ? strlen(pw) : 0; + + if (argc < 2 || argc > 3) + return CMD_RET_USAGE; + + if (pw_sz > TPM2_DIGEST_LEN) + return -EINVAL; + + if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1])) + handle = TPM2_RH_LOCKOUT; + else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1])) + handle = TPM2_RH_PLATFORM; + else + return CMD_RET_USAGE; + + return report_return_code(tpm2_clear(handle, pw, pw_sz)); +} + static cmd_tbl_t tpm2_commands[] = { U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""), U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""), U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm2_startup, "", ""), U_BOOT_CMD_MKENT(self_test, 0, 1, do_tpm2_self_test, "", ""), + U_BOOT_CMD_MKENT(clear, 0, 1, do_tpm2_clear, "", ""), };
cmd_tbl_t *get_tpm_commands(unsigned int *size) @@ -82,4 +106,9 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command", " <type> is one of:\n" " * full (perform all tests)\n" " * continue (only check untested tests)\n" +"clear <hierarchy>\n" +" Issue a TPM2_Clear command.\n" +" <hierarchy> is one of:\n" +" * TPM2_RH_LOCKOUT\n" +" * TPM2_RH_PLATFORM\n" ); diff --git a/include/tpm-v2.h b/include/tpm-v2.h index f6d50a3a0b..0d02e4a89b 100644 --- a/include/tpm-v2.h +++ b/include/tpm-v2.h @@ -143,4 +143,15 @@ u32 tpm2_startup(enum tpm2_startup_types mode); */ u32 tpm2_self_test(enum tpm2_yes_no full_test);
+/** + * Issue a TPM2_Clear command. + * + * @handle Handle + * @pw Password + * @pw_sz Length of the password + * + * @return code of the operation + */ +u32 tpm2_clear(u32 handle, const char *pw, const ssize_t pw_sz); + #endif /* __TPM_V2_H */ diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index c7156e569b..e3bfec5082 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -42,3 +42,38 @@ u32 tpm2_self_test(enum tpm2_yes_no full_test)
return tpm_sendrecv_command(command_v2, NULL, NULL); } + +u32 tpm2_clear(u32 handle, const char *pw, const ssize_t pw_sz) +{ + u8 command_v2[COMMAND_BUFFER_SIZE] = { + tpm_u16(TPM2_ST_SESSIONS), /* TAG */ + tpm_u32(27 + pw_sz), /* Length */ + tpm_u32(TPM2_CC_CLEAR), /* Command code */ + + /* HANDLE */ + tpm_u32(handle), /* TPM resource handle */ + + /* AUTH_SESSION */ + tpm_u32(9 + pw_sz), /* Authorization size */ + tpm_u32(TPM2_RS_PW), /* Session handle */ + tpm_u16(0), /* Size of <nonce> */ + /* <nonce> (if any) */ + 0, /* Attributes: Cont/Excl/Rst */ + tpm_u16(pw_sz), /* Size of <hmac/password> */ + /* STRING(pw) <hmac/password> (if any) */ + }; + unsigned int offset = 27; + int ret; + + /* + * Fill the command structure starting from the first buffer: + * - the password (if any) + */ + ret = pack_byte_string(command_v2, sizeof(command_v2), "s", + offset, pw, pw_sz); + offset += pw_sz; + if (ret) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(command_v2, NULL, NULL); +}