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tracing: Have eprobes use filtering logic of trace events 

The eprobes open code the reserving of the event on the ring buffer for
ftrace instead of using the ftrace event wrappers, which means that it
doesn't get affected by the filters, breaking the filtering logic on user
space.

Link: https://lkml.kernel.org/r/20211130024319.068451680@goodmis.org

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-11-29 21:39:48 -05:00
parent 6c536d76cf
commit 3e8b1a29a0
1 changed files with 4 additions and 10 deletions
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14
kernel/trace/trace_eprobe.c
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@ -489,18 +489,12 @@ __eprobe_trace_func(struct eprobe_data *edata, void *rec)
if (trace_trigger_soft_disabled(edata->file))
return;
fbuffer.trace_ctx = tracing_gen_ctx();
fbuffer.trace_file = edata->file;
dsize = get_eprobe_size(&edata->ep->tp, rec);
fbuffer.regs = NULL;
fbuffer.event =
trace_event_buffer_lock_reserve(&fbuffer.buffer, edata->file,
call->event.type,
sizeof(*entry) + edata->ep->tp.size + dsize,
fbuffer.trace_ctx);
if (!fbuffer.event)
entry = trace_event_buffer_reserve(&fbuffer, edata->file,
sizeof(*entry) + edata->ep->tp.size + dsize);
if (!entry)
return;
entry = fbuffer.entry = ring_buffer_event_data(fbuffer.event);