From 32e6e967fb36bf77ed99221ae3ce1909f045d8f9 Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@fb.com>
Date: Wed, 11 Apr 2018 18:02:37 +0000
Subject: [PATCH] perf/core: Need CAP_SYS_ADMIN to create k/uprobe with
perf_event_open()
Non-root user cannot create kprobe or uprobe through the text-based
interface (kprobe_events, uprobe_events),so they should not be able
to create probes via perf_event_open() either.
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Song Liu <songliubraving@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 33ea4b24277b ("perf/core: Implement the 'perf_uprobe' PMU")
Fixes: e12f03d7031a ("perf/core: Implement the 'perf_kprobe' PMU")
Link: http://lkml.kernel.org/r/C0B2EFB5-C403-4BDB-9046-C14B3EE66999@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/events/core.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index d7af828273736..2d5fe26551f87 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8400,6 +8400,10 @@ static int perf_kprobe_event_init(struct perf_event *event)
if (event->attr.type != perf_kprobe.type)
return -ENOENT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
/*
* no branch sampling for probe events
*/
@@ -8437,6 +8441,10 @@ static int perf_uprobe_event_init(struct perf_event *event)
if (event->attr.type != perf_uprobe.type)
return -ENOENT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
/*
* no branch sampling for probe events
*/
--
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