CVE-2024-26906 x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Disallow vsyscall page read for copyfromkernelnofault When trying to use copyfromkernelnofault to read vsyscall page through a bpf program, the following oops was reported: BUG: unable to handle page fault for address:...

CVE-2024-26906

CVE-2024-26906 : In the Linux kernel, x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault(). A bpf program reading the vsyscall page with bpf_probe_read_kernel() can trigger copy_from_kernel_nofault(), which calls __get_user_asm() and may fault because the vsyscall page is not readab...