s390/crypto: explicitly memzero stack key material in aes_s390.c

aes_s390.c has several functions which allocate space for key material on
the stack and leave the used keys there. It is considered good practice
to clean these locations before the function returns.

Link: https://lkml.kernel.org/r/20200221165511.GB6928@lst.de
Signed-off-by: Torsten Duwe <duwe@suse.de>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
index 1c23d84..7304463 100644 (file)
--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -342,6 +342,7 @@ static int cbc_aes_crypt(struct skcipher_request *req, unsigned long modifier)
                memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
                ret = skcipher_walk_done(&walk, nbytes - n);
        }
+       memzero_explicit(&param, sizeof(param));
        return ret;
 }
 
@@ -470,6 +471,8 @@ static int xts_aes_crypt(struct skcipher_request *req, unsigned long modifier)
                         walk.dst.virt.addr, walk.src.virt.addr, n);
                ret = skcipher_walk_done(&walk, nbytes - n);
        }
+       memzero_explicit(&pcc_param, sizeof(pcc_param));
+       memzero_explicit(&xts_param, sizeof(xts_param));
        return ret;
 }