linux-kernel - [PATCH] KEYS: Replace all non-returning strlcpy with strscpy

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Date:   Thu, 18 May 2023 04:15:13 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org
Subject: [PATCH] KEYS: Replace all non-returning 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().
No return values were used, so direct replacement is safe.

[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@...il.com>
---
 security/keys/request_key_auth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 41e9735006d0..8f33cd170e42 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -178,7 +178,7 @@ struct key *request_key_auth_new(struct key *target, const char *op,
 	if (!rka->callout_info)
 		goto error_free_rka;
 	rka->callout_len = callout_len;
-	strlcpy(rka->op, op, sizeof(rka->op));
+	strscpy(rka->op, op, sizeof(rka->op));
 
 	/* see if the calling process is already servicing the key request of
 	 * another process */