Commit 43b4578071c0 ("perf/x86: Reduce stack usage of
x86_schedule_events()") violated the rule that 'fake' scheduling; as
used for event/group validation; should not change the event state.
This went mostly un-noticed because repeated calls of
x86_pmu::get_event_constraints() would give the same result. And
x86_pmu::put_event_constraints() would mostly not do anything.
Commit e979121b1b15 ("perf/x86/intel: Implement cross-HT corruption
bug workaround") made the situation much worse by actually setting the
event->hw.constraint value to NULL, so when validation and actual
scheduling interact we get NULL ptr derefs.
Fix it by removing the constraint pointer from the event and move it
back to an array, this time in cpuc instead of on the stack.
validate_group()
x86_schedule_events()
event->hw.constraint = c; # store
<context switch>
perf_task_event_sched_in()
...
x86_schedule_events();
event->hw.constraint = c2; # store
...
put_event_constraints(event); # assume failure to schedule
intel_put_event_constraints()
event->hw.constraint = NULL;
<context switch end>
c = event->hw.constraint; # read -> NULL
if (!test_bit(hwc->idx, c->idxmsk)) # <- *BOOM* NULL deref
This in particular is possible when the event in question is a
cpu-wide event and group-leader, where the validate_group() tries to
add an event to the group.
Fixes: 43b4578071c0 ("perf/x86: Reduce stack usage of x86_schedule_events()")
Fixes: e979121b1b15 ("perf/x86/intel: Implement cross-HT corruption bug
workaround")
Cc: Andrew Hunter <[email protected]>
Cc: Maria Dimakopoulou <[email protected]>
Reported-by: Vince Weaver <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
---
arch/x86/kernel/cpu/perf_event.c | 33 ++++++++++++++------------
arch/x86/kernel/cpu/perf_event.h | 9 +++----
arch/x86/kernel/cpu/perf_event_intel.c | 15 +++--------
arch/x86/kernel/cpu/perf_event_intel_ds.c | 4 +--
arch/x86/kernel/cpu/perf_event_intel_uncore.c | 7 ++---
arch/x86/kernel/cpu/perf_event_intel_uncore.h | 1
6 files changed, 33 insertions(+), 36 deletions(-)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -620,7 +620,7 @@ struct sched_state {
struct perf_sched {
int max_weight;
int max_events;
- struct perf_event **events;
+ struct event_constraint **constraints;
struct sched_state state;
int saved_states;
struct sched_state saved[SCHED_STATES_MAX];
@@ -629,7 +629,7 @@ struct perf_sched {
/*
* Initialize interator that runs through all events and counters.
*/
-static void perf_sched_init(struct perf_sched *sched, struct perf_event
**events,
+static void perf_sched_init(struct perf_sched *sched, struct event_constraint
**constraints,
int num, int wmin, int wmax)
{
int idx;
@@ -637,10 +637,10 @@ static void perf_sched_init(struct perf_
memset(sched, 0, sizeof(*sched));
sched->max_events = num;
sched->max_weight = wmax;
- sched->events = events;
+ sched->constraints = constraints;
for (idx = 0; idx < num; idx++) {
- if (events[idx]->hw.constraint->weight == wmin)
+ if (constraints[idx]->weight == wmin)
break;
}
@@ -687,7 +687,7 @@ static bool __perf_sched_find_counter(st
if (sched->state.event >= sched->max_events)
return false;
- c = sched->events[sched->state.event]->hw.constraint;
+ c = sched->constraints[sched->state.event];
/* Prefer fixed purpose counters */
if (c->idxmsk64 & (~0ULL << INTEL_PMC_IDX_FIXED)) {
idx = INTEL_PMC_IDX_FIXED;
@@ -745,7 +745,7 @@ static bool perf_sched_next_event(struct
if (sched->state.weight > sched->max_weight)
return false;
}
- c = sched->events[sched->state.event]->hw.constraint;
+ c = sched->constraints[sched->state.event];
} while (c->weight != sched->state.weight);
sched->state.counter = 0; /* start with first counter */
@@ -756,12 +756,12 @@ static bool perf_sched_next_event(struct
/*
* Assign a counter for each event.
*/
-int perf_assign_events(struct perf_event **events, int n,
+int perf_assign_events(struct event_constraint **constraints, int n,
int wmin, int wmax, int *assign)
{
struct perf_sched sched;
- perf_sched_init(&sched, events, n, wmin, wmax);
+ perf_sched_init(&sched, constraints, n, wmin, wmax);
do {
if (!perf_sched_find_counter(&sched))
@@ -788,9 +788,9 @@ int x86_schedule_events(struct cpu_hw_ev
x86_pmu.start_scheduling(cpuc);
for (i = 0, wmin = X86_PMC_IDX_MAX, wmax = 0; i < n; i++) {
- hwc = &cpuc->event_list[i]->hw;
+ cpuc->event_constraint[i] = NULL;
c = x86_pmu.get_event_constraints(cpuc, i, cpuc->event_list[i]);
- hwc->constraint = c;
+ cpuc->event_constraint[i] = c;
wmin = min(wmin, c->weight);
wmax = max(wmax, c->weight);
@@ -801,7 +801,7 @@ int x86_schedule_events(struct cpu_hw_ev
*/
for (i = 0; i < n; i++) {
hwc = &cpuc->event_list[i]->hw;
- c = hwc->constraint;
+ c = cpuc->event_constraint[i];
/* never assigned */
if (hwc->idx == -1)
@@ -821,9 +821,10 @@ int x86_schedule_events(struct cpu_hw_ev
}
/* slow path */
- if (i != n)
- unsched = perf_assign_events(cpuc->event_list, n, wmin,
+ if (i != n) {
+ unsched = perf_assign_events(cpuc->event_constraint, n, wmin,
wmax, assign);
+ }
/*
* In case of success (unsched = 0), mark events as committed,
@@ -840,7 +841,7 @@ int x86_schedule_events(struct cpu_hw_ev
e = cpuc->event_list[i];
e->hw.flags |= PERF_X86_EVENT_COMMITTED;
if (x86_pmu.commit_scheduling)
- x86_pmu.commit_scheduling(cpuc, e, assign[i]);
+ x86_pmu.commit_scheduling(cpuc, i, assign[i]);
}
}
@@ -1292,8 +1293,10 @@ static void x86_pmu_del(struct perf_even
x86_pmu.put_event_constraints(cpuc, event);
/* Delete the array entry. */
- while (++i < cpuc->n_events)
+ while (++i < cpuc->n_events) {
cpuc->event_list[i-1] = cpuc->event_list[i];
+ cpuc->event_constraint[i-1] = cpuc->event_constraint[i];
+ }
--cpuc->n_events;
perf_event_update_userpage(event);
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -172,7 +172,10 @@ struct cpu_hw_events {
added in the current transaction */
int assign[X86_PMC_IDX_MAX]; /* event to counter
assignment */
u64 tags[X86_PMC_IDX_MAX];
+
struct perf_event *event_list[X86_PMC_IDX_MAX]; /* in enabled
order */
+ struct event_constraint *event_constraint[X86_PMC_IDX_MAX];
+
unsigned int group_flag;
int is_fake;
@@ -519,9 +522,7 @@ struct x86_pmu {
void (*put_event_constraints)(struct cpu_hw_events *cpuc,
struct perf_event *event);
- void (*commit_scheduling)(struct cpu_hw_events *cpuc,
- struct perf_event *event,
- int cntr);
+ void (*commit_scheduling)(struct cpu_hw_events *cpuc, int
idx, int cntr);
void (*start_scheduling)(struct cpu_hw_events *cpuc);
@@ -717,7 +718,7 @@ static inline void __x86_pmu_enable_even
void x86_pmu_enable_all(int added);
-int perf_assign_events(struct perf_event **events, int n,
+int perf_assign_events(struct event_constraint **constraints, int n,
int wmin, int wmax, int *assign);
int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign);
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2106,7 +2106,7 @@ static struct event_constraint *
intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
struct perf_event *event)
{
- struct event_constraint *c1 = event->hw.constraint;
+ struct event_constraint *c1 = cpuc->event_constraint[idx];
struct event_constraint *c2;
/*
@@ -2188,8 +2188,6 @@ intel_put_shared_regs_event_constraints(
static void intel_put_event_constraints(struct cpu_hw_events *cpuc,
struct perf_event *event)
{
- struct event_constraint *c = event->hw.constraint;
-
intel_put_shared_regs_event_constraints(cpuc, event);
/*
@@ -2197,19 +2195,14 @@ static void intel_put_event_constraints(
* all events are subject to and must call the
* put_excl_constraints() routine
*/
- if (c && cpuc->excl_cntrs)
+ if (cpuc->excl_cntrs)
intel_put_excl_constraints(cpuc, event);
-
- /* cleanup dynamic constraint */
- if (c && (c->flags & PERF_X86_EVENT_DYNAMIC))
- event->hw.constraint = NULL;
}
-static void intel_commit_scheduling(struct cpu_hw_events *cpuc,
- struct perf_event *event, int cntr)
+static void intel_commit_scheduling(struct cpu_hw_events *cpuc, int idx, int
cntr)
{
struct intel_excl_cntrs *excl_cntrs = cpuc->excl_cntrs;
- struct event_constraint *c = event->hw.constraint;
+ struct event_constraint *c = cpuc->event_constraint[idx];
struct intel_excl_states *xlo, *xl;
int tid = cpuc->excl_thread_id;
int o_tid = 1 - tid;
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -706,9 +706,9 @@ void intel_pmu_pebs_disable(struct perf_
cpuc->pebs_enabled &= ~(1ULL << hwc->idx);
- if (event->hw.constraint->flags & PERF_X86_EVENT_PEBS_LDLAT)
+ if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT)
cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32));
- else if (event->hw.constraint->flags & PERF_X86_EVENT_PEBS_ST)
+ else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST)
cpuc->pebs_enabled &= ~(1ULL << 63);
if (cpuc->enabled)
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -364,9 +364,8 @@ static int uncore_assign_events(struct i
bitmap_zero(used_mask, UNCORE_PMC_IDX_MAX);
for (i = 0, wmin = UNCORE_PMC_IDX_MAX, wmax = 0; i < n; i++) {
- hwc = &box->event_list[i]->hw;
c = uncore_get_event_constraint(box, box->event_list[i]);
- hwc->constraint = c;
+ box->event_constraint[i] = c;
wmin = min(wmin, c->weight);
wmax = max(wmax, c->weight);
}
@@ -374,7 +373,7 @@ static int uncore_assign_events(struct i
/* fastpath, try to reuse previous register */
for (i = 0; i < n; i++) {
hwc = &box->event_list[i]->hw;
- c = hwc->constraint;
+ c = box->event_constraint[i];
/* never assigned */
if (hwc->idx == -1)
@@ -394,7 +393,7 @@ static int uncore_assign_events(struct i
}
/* slow path */
if (i != n)
- ret = perf_assign_events(box->event_list, n,
+ ret = perf_assign_events(box->event_constraint, n,
wmin, wmax, assign);
if (!assign || ret) {
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.h
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
@@ -97,6 +97,7 @@ struct intel_uncore_box {
atomic_t refcnt;
struct perf_event *events[UNCORE_PMC_IDX_MAX];
struct perf_event *event_list[UNCORE_PMC_IDX_MAX];
+ struct event_constraint *event_constraint[UNCORE_PMC_IDX_MAX];
unsigned long active_mask[BITS_TO_LONGS(UNCORE_PMC_IDX_MAX)];
u64 tags[UNCORE_PMC_IDX_MAX];
struct pci_dev *pci_dev;
--
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