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authorAzeem Shaikh <azeemshaikh38@gmail.com>2023-06-20 20:08:32 +0000
committerHerbert Xu <herbert@gondor.apana.org.au>2023-07-14 18:23:14 +1000
commitbabb80b3ecc6f40c962e13c654ebcd27f25ee327 (patch)
treecb1073d1e5a21ebd3b802883f5c4fc9db1ef785b
parent31ba6dd2298fd9c49ecf66200103b1e88055f7a0 (diff)
crypto: lrw,xts - Replace strlcpy with strscpy
strlcpy() reads the entire source buffer first. This read may exceed the destination size limit. This is both inefficient and can lead to linear read overflows if a source string is not NUL-terminated [1]. In an effort to remove strlcpy() completely [2], replace strlcpy() here with strscpy(). Direct replacement is safe here since return value of -errno is used to check for truncation instead of sizeof(dest). [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [2] https://github.com/KSPP/linux/issues/89 Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--crypto/lrw.c6
-rw-r--r--crypto/xts.c6
2 files changed, 6 insertions, 6 deletions
diff --git a/crypto/lrw.c b/crypto/lrw.c
index 1b0f76ba3eb5..59260aefed28 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -357,10 +357,10 @@ static int lrw_create(struct crypto_template *tmpl, struct rtattr **tb)
* cipher name.
*/
if (!strncmp(cipher_name, "ecb(", 4)) {
- unsigned len;
+ int len;
- len = strlcpy(ecb_name, cipher_name + 4, sizeof(ecb_name));
- if (len < 2 || len >= sizeof(ecb_name))
+ len = strscpy(ecb_name, cipher_name + 4, sizeof(ecb_name));
+ if (len < 2)
goto err_free_inst;
if (ecb_name[len - 1] != ')')
diff --git a/crypto/xts.c b/crypto/xts.c
index 09be909a6a1a..548b302c6c6a 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -396,10 +396,10 @@ static int xts_create(struct crypto_template *tmpl, struct rtattr **tb)
* cipher name.
*/
if (!strncmp(cipher_name, "ecb(", 4)) {
- unsigned len;
+ int len;
- len = strlcpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
- if (len < 2 || len >= sizeof(ctx->name))
+ len = strscpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
+ if (len < 2)
goto err_free_inst;
if (ctx->name[len - 1] != ')')