From: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
[ Upstream commit 84e99e58e8d1e26f04c097f4266e431a33987f36 ]
Add barrier to soob. Return -EOVERFLOW if the buffer
is exceeded.
Suggested-by: Hillf Danton <hdanton@xxxxxxxx>
Reported-by: syzbot+bfdd4a2f07be52351350@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
security/smack/smackfs.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 94bd9e41c9ec..d186d24ac649 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -912,11 +912,21 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
else
rule += strlen(skp->smk_known) + 1;
+ if (rule > data + count) {
+ rc = -EOVERFLOW;
+ goto out;
+ }
+
ret = sscanf(rule, "%d", &maplevel);
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
goto out;
rule += SMK_DIGITLEN;
+ if (rule > data + count) {
+ rc = -EOVERFLOW;
+ goto out;
+ }
+
ret = sscanf(rule, "%d", &catlen);
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
goto out;
--
2.25.1
