linux-kernel - [PATCH] apparmor: Replace memcpy + NUL termination with kmemdup_nul in do

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Message-ID: <20260125210014.154432-2-thorsten.blum@linux.dev>
Date: Sun, 25 Jan 2026 22:00:15 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: John Johansen <john.johansen@...onical.com>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	apparmor@...ts.ubuntu.com,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] apparmor: Replace memcpy + NUL termination with kmemdup_nul in do_setattr

Use kmemdup_nul() to copy 'value' instead of using memcpy() followed by
a manual NUL termination.  No functional changes.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 security/apparmor/lsm.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index a87cd60ed206..98b92af5890e 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -866,12 +866,9 @@ static int do_setattr(u64 attr, void *value, size_t size)
 
 	/* AppArmor requires that the buffer must be null terminated atm */
 	if (args[size - 1] != '\0') {
-		/* null terminate */
-		largs = args = kmalloc(size + 1, GFP_KERNEL);
+		largs = args = kmemdup_nul(value, size, GFP_KERNEL);
 		if (!args)
 			return -ENOMEM;
-		memcpy(args, value, size);
-		args[size] = '\0';
 	}
 
 	error = -EINVAL;
-- 
Thorsten Blum <thorsten.blum@...ux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4