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perf machine: Set PROT_EXEC for executable PERF_RECORD_MMAP records

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message May 2, 2018 perf events

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Commit-ID:  0f476f2bbc1b46f76f9383dfe647858a888549aa
Gitweb:     https://git.kernel.org/tip/0f476f2bbc1b46f76f9383dfe647858a888549aa
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Thu, 26 Apr 2018 11:30:50 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Thu, 26 Apr 2018 13:47:19 -0300

perf machine: Set PROT_EXEC for executable PERF_RECORD_MMAP records

The kernel doesn't fill the map 'prot' field for PERF_RECORD_MMAP records, and we will use that info to replace checking for MAP__VARIABLE, so store that when processing the PERF_RECORD_MISC_MMAP_DATA perf_event_attr.header.misc bit.

Cc Adrian Hunter <[email protected]>
Cc David Ahern <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Wang Nan <[email protected]>
Link https://lkml.kernel.org/n/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/util/machine.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
tools/perf/util/machine.c +6 -2
index 3422ef67ec21..53bc2fb88be4 100644
@@ -24,6 +24,7 @@
 
 #include "sane_ctype.h"
 #include <symbol/kallsyms.h>
+#include <linux/mman.h>
 
 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
 

@@ -1457,6 +1458,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
 	struct thread *thread;
 	struct map *map;
 	enum map_type type;
+	u32 prot = 0;
 	int ret = 0;
 
 	if (dump_trace)

@@ -1477,12 +1479,14 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
 
 	if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
 		type = MAP__VARIABLE;
-	else
+	else {
 		type = MAP__FUNCTION;
+		prot = PROT_EXEC;
+	}
 
 	map = map__new(machine, event->mmap.start,
 			event->mmap.len, event->mmap.pgoff,
-			0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, prot, 0,
 			event->mmap.filename,
 			type, thread);