[U-Boot] [PATCH 18/25] tpm: Report tpm errors on the command line

Simon Glass
2015-08-11T14:48:10Z

When a 'tpm' command fails, we set the return code but give no indication
of failure. This can be confusing.

Add an error message when any tpm command fails.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

common/cmd_tpm.c | 46 ++++++++++++++++++++++++----------------------
1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/common/cmd_tpm.c b/common/cmd_tpm.c
index 274e3cd..f48ab04 100644
--- a/common/cmd_tpm.c
+++ b/common/cmd_tpm.c
@@ -80,17 +80,19 @@ static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr)
}

/**
- * Convert TPM command return code to U-Boot command error codes.
+ * report_return_code() - Report any error and return failure or success
*
* @param return_code TPM command return code
* @return value of enum command_ret_t
*/
-static int convert_return_code(uint32_t return_code)
+static int report_return_code(int return_code)
{
- if (return_code)
+ if (return_code < 0) {
+ printf("Error: %d\n", return_code);
return CMD_RET_FAILURE;
- else
+ } else {
return CMD_RET_SUCCESS;
+ }
}

/**
@@ -252,7 +254,7 @@ static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag,
return CMD_RET_FAILURE;
}

- return convert_return_code(tpm_startup(mode));
+ return report_return_code(tpm_startup(mode));
}

static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag,
@@ -266,7 +268,7 @@ static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag,
perm = simple_strtoul(argv[2], NULL, 0);
size = simple_strtoul(argv[3], NULL, 0);

- return convert_return_code(tpm_nv_define_space(index, perm, size));
+ return report_return_code(tpm_nv_define_space(index, perm, size));
}

static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag,
@@ -287,7 +289,7 @@ static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag,
print_byte_string(data, count);
}

- return convert_return_code(rc);
+ return report_return_code(rc);
}

static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag,
@@ -309,7 +311,7 @@ static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag,
rc = tpm_nv_write_value(index, data, count);
free(data);

- return convert_return_code(rc);
+ return report_return_code(rc);
}

static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag,
@@ -332,7 +334,7 @@ static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag,
print_byte_string(out_digest, sizeof(out_digest));
}

- return convert_return_code(rc);
+ return report_return_code(rc);
}

static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag,
@@ -353,7 +355,7 @@ static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag,
print_byte_string(data, count);
}

- return convert_return_code(rc);
+ return report_return_code(rc);
}

static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag,
@@ -365,7 +367,7 @@ static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag,
return CMD_RET_USAGE;
presence = (uint16_t)simple_strtoul(argv[1], NULL, 0);

- return convert_return_code(tpm_tsc_physical_presence(presence));
+ return report_return_code(tpm_tsc_physical_presence(presence));
}

static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag,
@@ -385,7 +387,7 @@ static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag,
print_byte_string(data, count);
}

- return convert_return_code(rc);
+ return report_return_code(rc);
}

static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag,
@@ -397,7 +399,7 @@ static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag,
return CMD_RET_USAGE;
state = (uint8_t)simple_strtoul(argv[1], NULL, 0);

- return convert_return_code(tpm_physical_set_deactivated(state));
+ return report_return_code(tpm_physical_set_deactivated(state));
}

static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag,
@@ -420,7 +422,7 @@ static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag,
print_byte_string(cap, count);
}

- return convert_return_code(rc);
+ return report_return_code(rc);
}

#define TPM_COMMAND_NO_ARG(cmd) \
@@ -429,7 +431,7 @@ static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \
{ \
if (argc != 1) \
return CMD_RET_USAGE; \
- return convert_return_code(cmd()); \
+ return report_return_code(cmd()); \
}

TPM_COMMAND_NO_ARG(tpm_init)
@@ -485,7 +487,7 @@ static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag,
print_byte_string(response, response_length);
}

- return convert_return_code(rc);
+ return report_return_code(rc);
}

static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag,
@@ -503,7 +505,7 @@ static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag,
index = simple_strtoul(argv[2], NULL, 0);
perm = simple_strtoul(argv[3], NULL, 0);

- return convert_return_code(tpm_nv_define_space(index, perm, size));
+ return report_return_code(tpm_nv_define_space(index, perm, size));
}

static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag,
@@ -532,7 +534,7 @@ static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag,
}
free(data);

- return convert_return_code(err);
+ return report_return_code(err);
}

static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag,
@@ -560,7 +562,7 @@ static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag,
err = tpm_nv_write_value(index, data, count);
free(data);

- return convert_return_code(err);
+ return report_return_code(err);
}

#ifdef CONFIG_TPM_AUTH_SESSIONS
@@ -572,7 +574,7 @@ static int do_tpm_oiap(cmd_tbl_t *cmdtp, int flag,

err = tpm_oiap(&auth_handle);

- return convert_return_code(err);
+ return report_return_code(err);
}

static int do_tpm_load_key2_oiap(cmd_tbl_t *cmdtp, int flag,
@@ -597,7 +599,7 @@ static int do_tpm_load_key2_oiap(cmd_tbl_t *cmdtp, int flag,
if (!err)
printf("Key handle is 0x%x\n", key_handle);

- return convert_return_code(err);
+ return report_return_code(err);
}

static int do_tpm_get_pub_key_oiap(cmd_tbl_t *cmdtp, int flag,
@@ -622,7 +624,7 @@ static int do_tpm_get_pub_key_oiap(cmd_tbl_t *cmdtp, int flag,
printf("dump of received pub key structure:\n");
print_byte_string(pub_key_buffer, pub_key_len);
}
- return convert_return_code(err);
+ return report_return_code(err);
}

TPM_COMMAND_NO_ARG(tpm_end_oiap)
--
2.5.0.rc2.392.g76e840b