[Linux-ima-devel] [PATCH 0/7] IMA: new parser for ima_restore_measurement_list()

On 5/17/2017 6:28 PM, Ken Goldman wrote:

On 5/17/2017 3:25 AM, Roberto Sassu wrote:

quoted

The format of digestN is: <algo name>:\0<digest value>, the same used
for the file digest.

Since the format is changing from the SHA-1 log format anyway ...

How do people feel about the colon and null terminated string format for
algorithm identifiers?

The TCG standard enumerations are uint16_t, and there is a registry of
hash algorithms.

As a consuming parser, it feels nice to know it's always 2 bytes and not
have to worry about a missing colon or a missing nul terminator risking
a buffer overflow.

There cannot be buffer overflow, because the length of each digest
field is known.

Roberto
--
To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html