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tpm: Fix display of data in pubek sysfs entry

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This patch fixes the TPM's pubek sysfs entry that is accessible as long
as the TPM doesn't have an owner. It was necessary to shift the access to the
data by -10 -- the first byte immediately follows the 10 byte header. The
line

 	data = tpm_cmd.params.readpubek_out_buffer;

sets it at the offset '10' in the packet, so we can read the data array
starting at offset '0'.

Before:

Algorithm: 00 0C 00 00
Encscheme: 08 00
Sigscheme: 00 00
Parameters: 00 00 00 00 01 00 AC E2 5E 3C A0 78
Modulus length: -563306801
Modulus:
28 21 08 0F 82 CD F2 B1 E7 49 F7 74 70 BE 59 8C
43 78 B1 24 EA 52 E2 FE 52 5C 3A 12 3B DC 61 71
[...]

After:

Algorithm: 00 00 00 01
Encscheme: 00 03
Sigscheme: 00 01
Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
Modulus length: 256
Modulus:
AC E2 5E 3C A0 78 DE 6C 9E CF 28 21 08 0F 82 CD
F2 B1 E7 49 F7 74 70 BE 59 8C 43 78 B1 24 EA 52
[...]

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
This commit is contained in:
Stefan Berger 2011-03-30 12:13:29 -04:00 committed by Rajiv Andrade
parent 6259210176
commit 5a79444f24
1 changed files with 16 additions and 10 deletions
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26
drivers/char/tpm/tpm.c
View file

@ -878,18 +878,24 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
data = tpm_cmd.params.readpubek_out_buffer;
str +=
sprintf(str,
"Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
"Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
" %02X %02X %02X %02X %02X %02X %02X %02X\n"
"Modulus length: %d\nModulus: \n",
data[10], data[11], data[12], data[13], data[14],
data[15], data[16], data[17], data[22], data[23],
data[24], data[25], data[26], data[27], data[28],
data[29], data[30], data[31], data[32], data[33],
be32_to_cpu(*((__be32 *) (data + 34))));
"Algorithm: %02X %02X %02X %02X\n"
"Encscheme: %02X %02X\n"
"Sigscheme: %02X %02X\n"
"Parameters: %02X %02X %02X %02X "
"%02X %02X %02X %02X "
"%02X %02X %02X %02X\n"
"Modulus length: %d\n"
"Modulus:\n",
data[0], data[1], data[2], data[3],
data[4], data[5],
data[6], data[7],
data[12], data[13], data[14], data[15],
data[16], data[17], data[18], data[19],
data[20], data[21], data[22], data[23],
be32_to_cpu(*((__be32 *) (data + 24))));
for (i = 0; i < 256; i++) {
str += sprintf(str, "%02X ", data[i + 38]);
str += sprintf(str, "%02X ", data[i + 28]);
if ((i + 1) % 16 == 0)
str += sprintf(str, "\n");
}