From 4cb912f1d1447077160ace9ce3b3a10696dd74e5 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Thu, 12 Feb 2009 14:50:05 -0500 Subject: SELinux: NULL terminate al contexts from disk When a context is pulled in from disk we don't know that it is null terminated. This patch forecebly null terminates contexts when we pull them from disk. Signed-off-by: Eric Paris Acked-by: Stephen Smalley Signed-off-by: James Morris --- security/selinux/hooks.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'security/selinux') diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index aebcfad5613f..309648c573d8 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1270,12 +1270,13 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent } len = INITCONTEXTLEN; - context = kmalloc(len, GFP_NOFS); + context = kmalloc(len+1, GFP_NOFS); if (!context) { rc = -ENOMEM; dput(dentry); goto out_unlock; } + context[len] = '\0'; rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, context, len); if (rc == -ERANGE) { @@ -1288,12 +1289,13 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent } kfree(context); len = rc; - context = kmalloc(len, GFP_NOFS); + context = kmalloc(len+1, GFP_NOFS); if (!context) { rc = -ENOMEM; dput(dentry); goto out_unlock; } + context[len] = '\0'; rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, context, len); -- cgit v1.2.3