From 5f65e5ca286126a60f62c8421b77c2018a482b8a Mon Sep 17 00:00:00 2001 From: Seth Forshee Date: Tue, 26 Apr 2016 14:36:24 -0500 Subject: [PATCH] cred: Reject inodes with invalid ids in set_create_file_as() Using INVALID_[UG]ID for the LSM file creation context doesn't make sense, so return an error if the inode passed to set_create_file_as() has an invalid id. Signed-off-by: Seth Forshee Acked-by: Serge Hallyn Signed-off-by: Eric W. Biederman --- kernel/cred.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/cred.c b/kernel/cred.c index 0c0cd8a62285..5f264fb5737d 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -689,6 +689,8 @@ EXPORT_SYMBOL(set_security_override_from_ctx); */ int set_create_files_as(struct cred *new, struct inode *inode) { + if (!uid_valid(inode->i_uid) || !gid_valid(inode->i_gid)) + return -EINVAL; new->fsuid = inode->i_uid; new->fsgid = inode->i_gid; return security_kernel_create_files_as(new, inode); -- 2.20.1