lkml.org 
[lkml]   [2020]   [Dec]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.14 01/50] perf event: Check ref_reloc_sym before using it
Date
From: Igor Lubashev <ilubashe@akamai.com>

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@linaro.org>
Signed-off-by: Igor Lubashev <ilubashe@akamai.com>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1566869956-7154-2-git-send-email-ilubashe@akamai.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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
@@ -794,11 +794,13 @@ 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
@@ -822,7 +824,6 @@ 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));

\
 
 \ /
  Last update: 2020-12-01 10:10    [W:0.270 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site