Patch 1 updates the tpm driver to compare HMAC values in constant time.
Patch 2 simplifies the HMAC computation in the tpm driver by using the
library API instead of an open-coded HMAC implementation. Note that
this depends on the HMAC library API that was merged for v6.17-rc1.
Changed in v2:
- Updated commit message of patch 1 to no longer characterize it as a
fix. Explained why the side channel seems to have been benign.
Eric Biggers (2):
tpm: Compare HMAC values in constant time
tpm: Use HMAC-SHA256 library instead of open-coded HMAC
drivers/char/tpm/Kconfig | 1 +
drivers/char/tpm/tpm2-sessions.c | 104 +++++++++----------------------
2 files changed, 31 insertions(+), 74 deletions(-)
base-commit: d6084bb815c453de27af8071a23163a711586a6c
--
2.50.1
