tpm: fix potential buffer overruns caused by bit glitches on the bus

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commit 3be2327475 upstream.

Discrete TPMs are often connected over slow serial buses which, on
some platforms, can have glitches causing bit flips.  If a bit does
flip it could cause an overrun if it's in one of the size parameters,
so sanity check that we're not overrunning the provided buffer when
doing a memcpy().

Signed-off-by: Jeremy Boone <jeremy.boone@nccgroup.trust>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
[bwh: Backported to 3.16: Drop the TPM2 bits]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Jeremy Boone 2018-02-08 12:28:08 -08:00 • committed by Ben Hutchings

parent 611e1526f9

commit e53bea6bcd

1 changed files with 4 additions and 0 deletions

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drivers/char/tpm/tpm-interface.c

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