Messages in this thread Patch in this message | | | Date | Tue, 9 Aug 2016 12:17:45 -0700 | From | tip-bot for Masami Hiramatsu <> | Subject | [tip:perf/urgent] perf probe: Adjust map->reloc offset when finding kernel symbol from map |
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Commit-ID: 8e34189b347d76acf48ce05831176582201b664d Gitweb: http://git.kernel.org/tip/8e34189b347d76acf48ce05831176582201b664d Author: Masami Hiramatsu <masami.hiramatsu@linaro.org> AuthorDate: Sat, 6 Aug 2016 19:29:48 +0900 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Tue, 9 Aug 2016 10:47:43 -0300
perf probe: Adjust map->reloc offset when finding kernel symbol from map
Adjust map->reloc offset for the unmapped address when finding alternative symbol address from map, because KASLR can relocate the kernel symbol address.
The same adjustment has been done when finding appropriate kernel symbol address from map which was introduced by commit f90acac75713 ("perf probe: Find given address from offline dwarf")
Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> Signed-off-by: Masami Hiramatsu <masami.hiramatsu@linaro.org> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20160806192948.e366f3fbc4b194de600f8326@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/probe-event.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 953dc1a..d5ccb65 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -385,7 +385,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo, if (uprobes) address = sym->start; else - address = map->unmap_ip(map, sym->start); + address = map->unmap_ip(map, sym->start) - map->reloc; break; } if (!address) {
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