diff options
| author | Azeem Shaikh <azeemshaikh38@gmail.com> | 2023-06-20 20:08:32 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 11:09:55 +0200 |
| commit | 6b0adfafb07396f1a176d3a6d10a551a56f0401d (patch) | |
| tree | f4e14bf120742614decb4050f86475136125d295 | |
| parent | dc100292e503e69c46dd11fc06056296c45d85d4 (diff) | |
crypto: lrw,xts - Replace strlcpy with strscpy
[ Upstream commit babb80b3ecc6f40c962e13c654ebcd27f25ee327 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | crypto/lrw.c | 6 | ||||
| -rw-r--r-- | crypto/xts.c | 6 |
2 files changed, 6 insertions, 6 deletions
diff --git a/crypto/lrw.c b/crypto/lrw.c index bcf09fbc750a..80d9076e42e0 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 de6cbcf69bbd..b05020657cdc 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] != ')') |