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perf/x86: Check branch sampling priv level in generic code

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This patch moves commit 7cc23cd to the generic code:

 perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL

The check is now implemented in generic code instead of x86 specific
code. That way we do not have to repeat the test in each arch
supporting branch sampling.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/r/20130521105337.GA2879@quad
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Stephane Eranian 2013-05-21 12:53:37 +02:00 committed by Ingo Molnar
parent 13acac3075
commit 2b923c8f5d
2 changed files with 7 additions and 15 deletions
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13
arch/x86/kernel/cpu/perf_event_intel_lbr.c
View File

@ -310,7 +310,7 @@ void intel_pmu_lbr_read(void)
* - in case there is no HW filter
* - in case the HW filter has errata or limitations
*/
static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
static void intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
{
u64 br_type = event->attr.branch_sample_type;
int mask = 0;
@ -318,11 +318,8 @@ static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
if (br_type & PERF_SAMPLE_BRANCH_USER)
mask |= X86_BR_USER;
if (br_type & PERF_SAMPLE_BRANCH_KERNEL) {
if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
return -EACCES;
if (br_type & PERF_SAMPLE_BRANCH_KERNEL)
mask |= X86_BR_KERNEL;
}
/* we ignore BRANCH_HV here */
@ -342,8 +339,6 @@ static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
* be used by fixup code for some CPU
*/
event->hw.branch_reg.reg = mask;
return 0;
}
/*
@ -391,9 +386,7 @@ int intel_pmu_setup_lbr_filter(struct perf_event *event)
/*
* setup SW LBR filter
*/
ret = intel_pmu_setup_sw_lbr_filter(event);
if (ret)
return ret;
intel_pmu_setup_sw_lbr_filter(event);
/*
* setup HW LBR filter, if any

9
kernel/events/core.c
View File

@ -6481,11 +6481,6 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
if (!(mask & ~PERF_SAMPLE_BRANCH_PLM_ALL))
return -EINVAL;
/* kernel level capture: check permissions */
if ((mask & PERF_SAMPLE_BRANCH_PERM_PLM)
&& perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
return -EACCES;
/* propagate priv level, when not set for branch */
if (!(mask & PERF_SAMPLE_BRANCH_PLM_ALL)) {
@ -6503,6 +6498,10 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
*/
attr->branch_sample_type = mask;
}
/* kernel level capture: check permissions */
if ((mask & PERF_SAMPLE_BRANCH_KERNEL)
&& perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
return -EACCES;
}
if (attr->sample_type & PERF_SAMPLE_REGS_USER) {