perf report: Add validation of call-chain entries
Add boundary checks for call-chain events. In case of corrupted
entries we could crash otherwise.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index eccae43..a7d3a61 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -337,6 +337,16 @@
*/
};
+#define MAX_STACK_DEPTH 255
+
+struct perf_callchain_entry {
+ __u16 nr;
+ __u16 hv;
+ __u16 kernel;
+ __u16 user;
+ __u64 ip[MAX_STACK_DEPTH];
+};
+
#ifdef __KERNEL__
/*
* Kernel-internal data types and definitions:
@@ -652,16 +662,6 @@
extern void perf_counter_task_migration(struct task_struct *task, int cpu);
-#define MAX_STACK_DEPTH 255
-
-struct perf_callchain_entry {
- u16 nr;
- u16 hv;
- u16 kernel;
- u16 user;
- u64 ip[MAX_STACK_DEPTH];
-};
-
extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
extern int sysctl_perf_counter_paranoid;