Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 01/50] perf event: Check ref_reloc_sym before using it | Date | Tue, 1 Dec 2020 09:53:00 +0100 |
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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));
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