tpm: Cap the number of PCR banks

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commit faf07e611d upstream.

tpm2_get_pcr_allocation() does not cap any upper limit for the number of
banks. Cap the limit to eight banks so that out of bounds values coming
from external I/O cause on only limited harm.

Cc: stable@vger.kernel.org # v5.10+
Fixes: bcfff8384f ("tpm: dynamically allocate the allocated_banks array")
Tested-by: Lai Yi <yi1.lai@linux.intel.com>
Reviewed-by: Jonathan McDowell <noodles@meta.com>
Reviewed-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jarkko Sakkinen 2025-09-30 15:58:02 +03:00 • committed by Greg Kroah-Hartman

parent 2b78da4cc7

commit 858344bc92

4 changed files with 8 additions and 14 deletions

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1

drivers/char/tpm/tpm-chip.c

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5

drivers/char/tpm/tpm1-cmd.c

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8

drivers/char/tpm/tpm2-cmd.c

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8

include/linux/tpm.h

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