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

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Message-ID: <20230710011748.3538624-1-azeemshaikh38@gmail.com>
Date:   Mon, 10 Jul 2023 01:17:48 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] acct: 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>
---
 kernel/acct.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/acct.c b/kernel/acct.c
index 010667ce6080..10f769e13f72 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -445,7 +445,7 @@ static void fill_ac(acct_t *ac)
 	memset(ac, 0, sizeof(acct_t));

 	ac->ac_version = ACCT_VERSION | ACCT_BYTEORDER;
-	strlcpy(ac->ac_comm, current->comm, sizeof(ac->ac_comm));
+	strscpy(ac->ac_comm, current->comm, sizeof(ac->ac_comm));

 	/* calculate run_time in nsec*/
 	run_time = ktime_get_ns();
--
2.41.0.255.g8b1d071c50-goog