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-rw-r--r--tools/perf/util/symbol.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 4efde7879474..765c75df2904 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -4,8 +4,10 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/mman.h>
+#include <linux/string.h>
#include <linux/time64.h>
#include <sys/types.h>
#include <sys/stat.h>
@@ -15,11 +17,17 @@
#include <inttypes.h>
#include "annotate.h"
#include "build-id.h"
+#include "cap.h"
+#include "dso.h"
#include "util.h"
#include "debug.h"
+#include "event.h"
#include "machine.h"
#include "map.h"
#include "symbol.h"
+#include "map_symbol.h"
+#include "mem-events.h"
+#include "symsrc.h"
#include "strlist.h"
#include "intlist.h"
#include "namespaces.h"
@@ -2195,13 +2203,19 @@ static bool symbol__read_kptr_restrict(void)
char line[8];
if (fgets(line, sizeof(line), fp) != NULL)
- value = ((geteuid() != 0) || (getuid() != 0)) ?
- (atoi(line) != 0) :
- (atoi(line) == 2);
+ value = perf_cap__capable(CAP_SYSLOG) ?
+ (atoi(line) >= 2) :
+ (atoi(line) != 0);
fclose(fp);
}
+ /* Per kernel/kallsyms.c:
+ * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
+ */
+ if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
+ value = true;
+
return value;
}