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Subject[PATCH v5 02/10] perf/core: open access to the core for CAP_PERFMON privileged process
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Open access to monitoring of kernel code, system, tracepoints and namespaces
data for a CAP_PERFMON privileged process. For backward compatibility
reasons access to perf_events subsystem remains open for CAP_SYS_ADMIN
privileged processes but CAP_SYS_ADMIN usage for secure perf_events
monitoring is discouraged with respect to CAP_PERFMON capability.
Providing the access under CAP_PERFMON capability singly, without the rest
of CAP_SYS_ADMIN credentials, excludes chances to misuse the credentials
and makes operation more secure.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
include/linux/perf_event.h | 6 +++---
kernel/events/core.c | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6d4c22aee384..730469babcc2 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1285,7 +1285,7 @@ static inline int perf_is_paranoid(void)

static inline int perf_allow_kernel(struct perf_event_attr *attr)
{
- if (sysctl_perf_event_paranoid > 1 && !capable(CAP_SYS_ADMIN))
+ if (sysctl_perf_event_paranoid > 1 && !perfmon_capable())
return -EACCES;

return security_perf_event_open(attr, PERF_SECURITY_KERNEL);
@@ -1293,7 +1293,7 @@ static inline int perf_allow_kernel(struct perf_event_attr *attr)

static inline int perf_allow_cpu(struct perf_event_attr *attr)
{
- if (sysctl_perf_event_paranoid > 0 && !capable(CAP_SYS_ADMIN))
+ if (sysctl_perf_event_paranoid > 0 && !perfmon_capable())
return -EACCES;

return security_perf_event_open(attr, PERF_SECURITY_CPU);
@@ -1301,7 +1301,7 @@ static inline int perf_allow_cpu(struct perf_event_attr *attr)

static inline int perf_allow_tracepoint(struct perf_event_attr *attr)
{
- if (sysctl_perf_event_paranoid > -1 && !capable(CAP_SYS_ADMIN))
+ if (sysctl_perf_event_paranoid > -1 && !perfmon_capable())
return -EPERM;

return security_perf_event_open(attr, PERF_SECURITY_TRACEPOINT);
diff --git a/kernel/events/core.c b/kernel/events/core.c
index a1f8bde19b56..b1fcbbe24849 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11186,7 +11186,7 @@ SYSCALL_DEFINE5(perf_event_open,
}

if (attr.namespaces) {
- if (!capable(CAP_SYS_ADMIN))
+ if (!perfmon_capable())
return -EACCES;
}

--
2.20.1
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