In the Linux kernel, the following vulnerability has been resolved:

tracing: Fix race between update_event_fields and, event_define_fields

The following sequence may leads race between event_define_fields()
and update_event_fields():

 CPU0 (loads module A)                      CPU1 (loads module B)
 ===============================            ===============================
 load_module(A)                             load_module(B)
   notifier_call_chain                        notifier_call_chain
     trace_module_notify                        trace_module_notify
       mutex_lock(&event_mutex)                   trace_event_update_all()
         trace_module_add_events(A)                 down_write(&trace_event_sem)
            __register_event(call_A)
              __add_event_to_tracers(call_A)
                event_define_fields(call_A)
                  for each f:                         list_for_each_entry(field,
                    list_add(&f->link,                                    &class->fields, link)
                             &class->fields)            field = class->fields->next;

Where access to the class->fields is not protected by the event_mutex in
trace_event_update_all().

This produces the following panic:
   Unable to handle kernel access ... at virtual address 0000000000000018
   pc : update_event_fields+0xf8/0x368
   Call trace:
    update_event_fields+0xf8/0x368
    trace_event_update_all+0x7c/0x2b4
    trace_module_notify+0x4c/0x1dc
    notifier_call_chain+0x84/0x168
    blocking_notifier_call_chain_robust+0x64/0xd4
    load_module+0x10c8/0x123c
    __arm64_sys_finit_module+0x230/0x31c

Fix by taking event_mutex in trace_event_update_all() before
trace_event_sem.

https://git.kernel.org/stable/c/4e39f7b4d9d36508c53e89e6cbc640728df870b5

https://git.kernel.org/stable/c/a30d421468300b1e7b2f233136aeb2db8013f555

https://git.kernel.org/stable/c/c3730b8373bb5059d735509b9e6a00d7eb337d7c

https://git.kernel.org/stable/c/e5f1d301b4bdaa4206db251fdc691f623162b0a8

https://git.kernel.org/stable/c/ed49684e69f846bf50b5050651ccdb87cfd152c0

https://git.kernel.org/stable/c/f128740f39ab28d1f4ad5bdd10f3e117eec0c374

https://git.kernel.org/stable/c/fdeb190b0905a6aaed1e5d6adfb8613214748d7d

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