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[RESEND,v2,08/18] cred: Reject inodes with invalid ids in set_create_file_as()

Message ID 1451930639-94331-9-git-send-email-seth.forshee@canonical.com (mailing list archive)
State Superseded
Headers show

Commit Message

Seth Forshee Jan. 4, 2016, 6:03 p.m. UTC 
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 <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
---
 kernel/cred.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/kernel/cred.c b/kernel/cred.c
index 71179a09c1d6..ff8606f77d90 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);