[PATCH 4.9 01/42] perf event: Check ref_reloc_sym before using it

From: Greg Kroah-Hartman
Date: Tue Dec 01 2020 - 04:31:43 EST


From: Igor Lubashev <ilubashe@xxxxxxxxxx>

commit e9a6882f267a8105461066e3ea6b4b6b9be1b807 upstream.

Check for ref_reloc_sym before using it instead of checking
symbol_conf.kptr_restrict and relying solely on that check.

Reported-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Igor Lubashev <ilubashe@xxxxxxxxxx>
Tested-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Suzuki Poulouse <suzuki.poulose@xxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1566869956-7154-2-git-send-email-ilubashe@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexander Dahl <ada@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
tools/perf/util/event.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -682,11 +682,13 @@ int perf_event__synthesize_kernel_mmap(s
int err;
union perf_event *event;

- if (symbol_conf.kptr_restrict)
- return -1;
if (map == NULL)
return -1;

+ kmap = map__kmap(map);
+ if (!kmap->ref_reloc_sym)
+ return -1;
+
/*
* We should get this from /sys/kernel/sections/.text, but till that is
* available use this, and after it is use this as a fallback for older
@@ -710,7 +712,6 @@ int perf_event__synthesize_kernel_mmap(s
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
}

- kmap = map__kmap(map);
size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
"%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
size = PERF_ALIGN(size, sizeof(u64));