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- Pass only an initialized perf event attribute to the LSM hook

Browse Source 
- Fix a use-after-free on the perf syscall's error path
 
 - A potential integer overflow fix in amd_core_pmu_init()
 
 - Fix the cgroup events tracking after the context handling rewrite
 
 - Return the proper value from the inherit_event() function on error
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Merge tag 'perf_urgent_for_v6.2_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Borislav Petkov:

 - Pass only an initialized perf event attribute to the LSM hook

 - Fix a use-after-free on the perf syscall's error path

 - A potential integer overflow fix in amd_core_pmu_init()

 - Fix the cgroup events tracking after the context handling rewrite

 - Return the proper value from the inherit_event() function on error

* tag 'perf_urgent_for_v6.2_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Call LSM hook after copying perf_event_attr
  perf: Fix use-after-free in error path
  perf/x86/amd: fix potential integer overflow on shift of a int
  perf/core: Fix cgroup events tracking
  perf core: Return error pointer if inherit_event() fails to find pmu_ctx
This commit is contained in:
Linus Torvalds 2023-01-01 11:27:00 -08:00
commit 150aae354b
2 changed files with 18 additions and 38 deletions
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2
arch/x86/events/amd/core.c
View File

@ -1387,7 +1387,7 @@ static int __init amd_core_pmu_init(void)
* numbered counter following it.
*/
for (i = 0; i < x86_pmu.num_counters - 1; i += 2)
even_ctr_mask |= 1 << i;
even_ctr_mask |= BIT_ULL(i);
pair_constraint = (struct event_constraint)
__EVENT_CONSTRAINT(0, even_ctr_mask, 0,

54
kernel/events/core.c
View File

@ -380,7 +380,6 @@ enum event_type_t {
/*
* perf_sched_events : >0 events exist
* perf_cgroup_events: >0 per-cpu cgroup events exist on this cpu
*/
static void perf_sched_delayed(struct work_struct *work);
@ -389,7 +388,6 @@ static DECLARE_DELAYED_WORK(perf_sched_work, perf_sched_delayed);
static DEFINE_MUTEX(perf_sched_mutex);
static atomic_t perf_sched_count;
static DEFINE_PER_CPU(atomic_t, perf_cgroup_events);
static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events);
static atomic_t nr_mmap_events __read_mostly;
@ -844,9 +842,16 @@ static void perf_cgroup_switch(struct task_struct *task)
struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct perf_cgroup *cgrp;
cgrp = perf_cgroup_from_task(task, NULL);
/*
* cpuctx->cgrp is set when the first cgroup event enabled,
* and is cleared when the last cgroup event disabled.
*/
if (READ_ONCE(cpuctx->cgrp) == NULL)
return;
WARN_ON_ONCE(cpuctx->ctx.nr_cgroups == 0);
cgrp = perf_cgroup_from_task(task, NULL);
if (READ_ONCE(cpuctx->cgrp) == cgrp)
return;
@ -3631,8 +3636,7 @@ void __perf_event_task_sched_out(struct task_struct *task,
* to check if we have to switch out PMU state.
* cgroup event are system-wide mode only
*/
if (atomic_read(this_cpu_ptr(&perf_cgroup_events)))
perf_cgroup_switch(next);
perf_cgroup_switch(next);
}
static bool perf_less_group_idx(const void *l, const void *r)
@ -4974,15 +4978,6 @@ static void unaccount_pmu_sb_event(struct perf_event *event)
detach_sb_event(event);
}
static void unaccount_event_cpu(struct perf_event *event, int cpu)
{
if (event->parent)
return;
if (is_cgroup_event(event))
atomic_dec(&per_cpu(perf_cgroup_events, cpu));
}
#ifdef CONFIG_NO_HZ_FULL
static DEFINE_SPINLOCK(nr_freq_lock);
#endif
@ -5048,8 +5043,6 @@ static void unaccount_event(struct perf_event *event)
schedule_delayed_work(&perf_sched_work, HZ);
}
unaccount_event_cpu(event, event->cpu);
unaccount_pmu_sb_event(event);
}
@ -11679,15 +11672,6 @@ static void account_pmu_sb_event(struct perf_event *event)
attach_sb_event(event);
}
static void account_event_cpu(struct perf_event *event, int cpu)
{
if (event->parent)
return;
if (is_cgroup_event(event))
atomic_inc(&per_cpu(perf_cgroup_events, cpu));
}
/* Freq events need the tick to stay alive (see perf_event_task_tick). */
static void account_freq_event_nohz(void)
{
@ -11775,8 +11759,6 @@ static void account_event(struct perf_event *event)
}
enabled:
account_event_cpu(event, event->cpu);
account_pmu_sb_event(event);
}
@ -12339,12 +12321,12 @@ SYSCALL_DEFINE5(perf_event_open,
if (flags & ~PERF_FLAG_ALL)
return -EINVAL;
/* Do we allow access to perf_event_open(2) ? */
err = security_perf_event_open(&attr, PERF_SECURITY_OPEN);
err = perf_copy_attr(attr_uptr, &attr);
if (err)
return err;
err = perf_copy_attr(attr_uptr, &attr);
/* Do we allow access to perf_event_open(2) ? */
err = security_perf_event_open(&attr, PERF_SECURITY_OPEN);
if (err)
return err;
@ -12689,7 +12671,8 @@ SYSCALL_DEFINE5(perf_event_open,
return event_fd;
err_context:
/* event->pmu_ctx freed by free_event() */
put_pmu_ctx(event->pmu_ctx);
event->pmu_ctx = NULL; /* _free_event() */
err_locked:
mutex_unlock(&ctx->mutex);
perf_unpin_context(ctx);
@ -12802,6 +12785,7 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
err_pmu_ctx:
put_pmu_ctx(pmu_ctx);
event->pmu_ctx = NULL; /* _free_event() */
err_unlock:
mutex_unlock(&ctx->mutex);
perf_unpin_context(ctx);
@ -12822,13 +12806,11 @@ static void __perf_pmu_remove(struct perf_event_context *ctx,
perf_event_groups_for_cpu_pmu(event, groups, cpu, pmu) {
perf_remove_from_context(event, 0);
unaccount_event_cpu(event, cpu);
put_pmu_ctx(event->pmu_ctx);
list_add(&event->migrate_entry, events);
for_each_sibling_event(sibling, event) {
perf_remove_from_context(sibling, 0);
unaccount_event_cpu(sibling, cpu);
put_pmu_ctx(sibling->pmu_ctx);
list_add(&sibling->migrate_entry, events);
}
@ -12847,7 +12829,6 @@ static void __perf_pmu_install_event(struct pmu *pmu,
if (event->state >= PERF_EVENT_STATE_OFF)
event->state = PERF_EVENT_STATE_INACTIVE;
account_event_cpu(event, cpu);
perf_install_in_context(ctx, event, cpu);
}
@ -13231,7 +13212,7 @@ inherit_event(struct perf_event *parent_event,
pmu_ctx = find_get_pmu_context(child_event->pmu, child_ctx, child_event);
if (IS_ERR(pmu_ctx)) {
free_event(child_event);
return NULL;
return ERR_CAST(pmu_ctx);
}
child_event->pmu_ctx = pmu_ctx;
@ -13742,8 +13723,7 @@ static int __perf_cgroup_move(void *info)
struct task_struct *task = info;
preempt_disable();
if (atomic_read(this_cpu_ptr(&perf_cgroup_events)))
perf_cgroup_switch(task);
perf_cgroup_switch(task);
preempt_enable();
return 0;