On Fri, Jan 14, 2022 at 8:41 AM Kumar Kartikeya Dwivedi
[off-list ref] wrote:

This adds a complete test case to ensure we never take references to
modules not in MODULE_STATE_LIVE, which can lead to UAF, and it also
ensures we never access btf->kfunc_set_tab in an inconsistent state.

The test uses userfaultfd to artificially widen the race.

When run on an unpatched kernel, it leads to the following splat:

[root@(none) bpf]# ./test_progs -t bpf_mod_race/ksym
[   55.498171] BUG: unable to handle page fault for address: fffffbfff802548b                                                                      [   55.499206] #PF: supervisor read access in kernel mode
[   55.499855] #PF: error_code(0x0000) - not-present page
[   55.500555] PGD a4fa9067 P4D a4fa9067 PUD a4fa5067 PMD 1b44067 PTE 0
[   55.501499] Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   55.502195] CPU: 0 PID: 83 Comm: kworker/0:2 Tainted: G           OE     5.16.0-rc4+ #151                                                       [   55.503388] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.15.0-1 04/01/2014

The commit log was messed up in a few places.
I've cleaned it up while applying.
Thanks!