4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Zijlstra <pet...@infradead.org>
commit 46b1b577229a091b137831becaa0fae8690ee15a upstream.
> arch/x86/events/intel/cstate.c:307 cstate_pmu_event_init() warn: potential
> spectre issue 'pkg_msr' (local cap)
> arch/x86/events/intel/core.c:337 intel_pmu_event_map() warn: potential
> spectre issue 'intel_perfmon_event_map'
> arch/x86/events/intel/knc.c:122 knc_pmu_event_map() warn: potential spectre
> issue 'knc_perfmon_event_map'
> arch/x86/events/intel/p4.c:722 p4_pmu_event_map() warn: potential spectre
> issue 'p4_general_events'
> arch/x86/events/intel/p6.c:116 p6_pmu_event_map() warn: potential spectre
> issue 'p6_perfmon_event_map'
> arch/x86/events/amd/core.c:132 amd_pmu_event_map() warn: potential spectre
> issue 'amd_perfmon_event_map'
Userspace controls @attr, sanitize @attr->config before passing it on
to x86_pmu::event_map().
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Cc: <sta...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Stephane Eranian <eran...@google.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Vince Weaver <vincent.wea...@maine.edu>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/events/core.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -26,6 +26,7 @@
#include <linux/cpu.h>
#include <linux/bitops.h>
#include <linux/device.h>
+#include <linux/nospec.h>
#include <asm/apic.h>
#include <asm/stacktrace.h>
@@ -423,6 +424,8 @@ int x86_setup_perfctr(struct perf_event
if (attr->config >= x86_pmu.max_events)
return -EINVAL;
+ attr->config = array_index_nospec((unsigned long)attr->config,
x86_pmu.max_events);
+
/*
* The generic map:
*/
