Hi Tushar, On Fri, 2021-01-29 at 16:45 -0800, Tushar Sugandhi wrote: > IMA does not measure duplicate buffer data since TPM extend is a very > expensive operation. However, in some cases for integrity critical > data, the measurement of duplicate data is necessary to accurately > determine the current state of the system. Eg, SELinux state changing > from 'audit', to 'enforcing', and back to 'audit' again. In this > example, currently, IMA will not measure the last state change to > 'audit'. This limits the ability of attestation services to accurately > determine the current state of the integrity critical data on the > system. > > This series addresses this gap by providing the ability to measure > duplicate entries for integrity critical data, driven by policy.
The same reason for re-measuring buffer data is equally applicable to files. In both cases, the file or the buffer isn't re-measured if it already exists in the htable. Please don't limit this patch set to just buffer data. thanks, Mimi
