tpm: add hmac checks to tpm2_pcr_extend()

Browse source

tpm2_pcr_extend() is used by trusted keys to extend a PCR to prevent a
key from being re-loaded until the next reboot.  To use this
functionality securely, that extend must be protected by a session
hmac.  This patch adds HMAC protection so tampering with the
tpm2_pcr_extend() command in flight is detected.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

...

This commit is contained in:

James Bottomley 2024-04-29 16:28:06 -04:00 • committed by Jarkko Sakkinen

parent 1085b8276b

commit 6519fea6fd

1 changed files with 10 additions and 17 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

27

drivers/char/tpm/tpm2-cmd.c

View file