x86/mm: Fix the read of vsyscall page through bpf
JIRA: https://issues.redhat.com/browse/RHEL-33168
CVE: CVE-2024-26906
As reported by syzboot 1 and 2, when trying to read vsyscall page
by using bpf_probe_read_kernel() or bpf_probe_read(), oops may happen.
Signed-off-by: Rafael Aquini aquini@redhat.com
Edited by Rafael Aquini