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Subject[RFC PATCH 1/2] crypto: Fix -Wstringop-truncation warnings
Date
As of GCC 9.0.0 the build is reporting warnings like:

crypto/ablkcipher.c: In function ‘crypto_ablkcipher_report’:
crypto/ablkcipher.c:374:2: warning: ‘strncpy’ specified bound 64 equals destination size [-Wstringop-truncation]
strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sizeof(rblkcipher.geniv));
~~~~~~~~~~~~~~~~~~~~~~~~~

This means the strnycpy might create a non null terminated string. Fix this by
limiting the size of the string copy to include the null terminator.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
crypto/ablkcipher.c | 4 ++--
crypto/blkcipher.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index d880a4897159..972cd7c879f6 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -372,7 +372,7 @@ static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)

strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
- sizeof(rblkcipher.geniv));
+ sizeof(rblkcipher.geniv) - 1);

rblkcipher.blocksize = alg->cra_blocksize;
rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
@@ -446,7 +446,7 @@ static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)

strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
- sizeof(rblkcipher.geniv));
+ sizeof(rblkcipher.geniv) - 1);

rblkcipher.blocksize = alg->cra_blocksize;
rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 01c0d4aa2563..f1644b5cf68c 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -511,7 +511,7 @@ static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)

strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
- sizeof(rblkcipher.geniv));
+ sizeof(rblkcipher.geniv) - 1);

rblkcipher.blocksize = alg->cra_blocksize;
rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
--
2.17.0
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