Commit 5b589d44 authored by Paul Moore's avatar Paul Moore Committed by Serge Hallyn

selinux: reject setexeccon() on MNT_NOSUID applications with -EACCES

We presently prevent processes from using setexecon() to set the
security label of exec()'d processes when NO_NEW_PRIVS is enabled by
returning an error; however, we silently ignore setexeccon() when
exec()'ing from a nosuid mounted filesystem.  This patch makes things
a bit more consistent by returning an error in the setexeccon()/nosuid
case.
Signed-off-by: default avatarPaul Moore <pmoore@redhat.com>
Acked-by: default avatarAndy Lutomirski <luto@amacapital.net>
Acked-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
parent ca7786a2
......@@ -2123,11 +2123,13 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
new_tsec->exec_sid = 0;
/*
* Minimize confusion: if no_new_privs and a transition is
* explicitly requested, then fail the exec.
* Minimize confusion: if no_new_privs or nosuid and a
* transition is explicitly requested, then fail the exec.
*/
if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)
return -EPERM;
if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
return -EACCES;
} else {
/* Check for a default transition on this program. */
rc = security_transition_sid(old_tsec->sid, isec->sid,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment