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| author | Denis Aleksandrov <daleksan@redhat.com> | 2025-09-15 17:08:29 -0400 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2025-10-10 08:21:45 +0300 |
| commit | a29ad21b988652dc60aa99c6d3b1e3d52dc69c30 (patch) | |
| tree | a15fd3608ea08d446b8e1b3714695904b61704fb /net/unix/af_unix.c | |
| parent | 207696b17f38e869e59889b44d395ab24bb678d3 (diff) | |
tpm: Prevent local DOS via tpm/tpm0/ppi/*operations
Reads on tpm/tpm0/ppi/*operations can become very long on
misconfigured systems. Reading the TPM is a blocking operation,
thus a user could effectively trigger a DOS.
Resolve this by caching the results and avoiding the blocking
operations after the first read.
[ jarkko: fixed atomic sleep:
sed -i 's/spin_/mutex_/g' drivers/char/tpm/tpm_ppi.c
sed -i 's/DEFINE_SPINLOCK/DEFINE_MUTEX/g' drivers/char/tpm/tpm_ppi.c ]
Signed-off-by: Denis Aleksandrov <daleksan@redhat.com>
Reported-by: Jan Stancek <jstancek@redhat.com>
Closes: https://lore.kernel.org/linux-integrity/20250915210829.6661-1-daleksan@redhat.com/T/#u
Suggested-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions