linux-kernel - [PATCH] ima: Replacing deprecated strlcpy with strscpy

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Date:   Fri, 19 Feb 2021 14:10:38 +0530
From:   Palash Oswal <hello@...alpalash.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ima: Replacing deprecated strlcpy with strscpy

The strlcpy() function is unsafe in that the source buffer length
is unbounded or possibly be non NULL terminated. This can cause
memory over-reads, crashes, etc.

Link: https://github.com/KSPP/linux/issues/89
Signed-off-by: Palash Oswal <hello@...alpalash.com>
---
 security/integrity/ima/ima_api.c    | 2 +-
 security/integrity/ima/ima_policy.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 1dd70dc68ffd..2f3b8257181d 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -399,7 +399,7 @@ const char *ima_d_path(const struct path *path, char **pathbuf, char *namebuf)
 	}
 
 	if (!pathname) {
-		strlcpy(namebuf, path->dentry->d_name.name, NAME_MAX);
+		strscpy(namebuf, path->dentry->d_name.name, NAME_MAX);
 		pathname = namebuf;
 	}
 
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 9b45d064a87d..010839aef6ba 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -791,7 +791,7 @@ static int __init ima_init_arch_policy(void)
 		char rule[255];
 		int result;
 
-		result = strlcpy(rule, *rules, sizeof(rule));
+		strscpy(rule, *rules, sizeof(rule));
 
 		INIT_LIST_HEAD(&arch_policy_entry[i].list);
 		result = ima_parse_rule(rule, &arch_policy_entry[i]);

base-commit: f6692213b5045dc461ce0858fb18cf46f328c202
-- 
2.27.0