crypto: s390/paes - Refuse clear key material by default

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This patch exploits the new xflag PKEY_XFLAG_NOCLEARKEY from the pkey
layer. So now by default all the paes algorithms refuse the use of
clear key material ("clear key tokens") in the setkey function with
-EINVAL.

With a new kernel module parameter "clrkey" this behavior can be
controlled. By default clrkey is 'N' but for testing purpose on module
load a true value (1, 'Y') may be given to accept clear key tokens.

Note that during selftest clear keys are always used and thus the
xflag PKEY_XFLAG_NOCLEARKEY is NOT set as long as the algorithm is in
a larval state indicated by crypto_skcipher_tested() returning false.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Harald Freudenberger 2026-01-15 13:00:26 +01:00 • committed by Herbert Xu

parent 452770a4fa

commit 9d58d22f36

1 changed files with 57 additions and 36 deletions

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arch/s390/crypto/paes_s390.c

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