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bus: arm-ccn: Do not attempt to configure XPs for cycle counter

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commit b7c1beb278e8e3dc664ed3df3fc786db126120a9 upstream.

Fuzzing the CCN perf driver revealed a small but definitely dangerous
mistake in the event setup code. When a cycle counter is requested, the
driver should not reconfigure the events bus at all, otherwise it will
corrupt (in most but the simplest cases) its configuration and may end
up accessing XP array out of its bounds and corrupting control
registers.

Reported-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pawel Moll 2016-08-05 15:07:10 +01:00 committed by Greg Kroah-Hartman
parent 23d6ad91f3
commit bd47c363ff
1 changed files with 4 additions and 0 deletions
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4
drivers/bus/arm-ccn.c
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@ -895,6 +895,10 @@ static void arm_ccn_pmu_xp_dt_config(struct perf_event *event, int enable)
struct arm_ccn_component *xp;
u32 val, dt_cfg;
/* Nothing to do for cycle counter */
if (hw->idx == CCN_IDX_PMU_CYCLE_COUNTER)
return;
if (CCN_CONFIG_TYPE(event->attr.config) == CCN_TYPE_XP)
xp = &ccn->xp[CCN_CONFIG_XP(event->attr.config)];
else