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perf probe: Adjust map->reloc offset when finding kernel symbol from map

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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 f90acac757 ("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>
This commit is contained in:
Masami Hiramatsu 2016-08-06 19:29:48 +09:00 committed by Arnaldo Carvalho de Melo
parent 887fa86d6f
commit 8e34189b34
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/probe-event.c
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@ -385,7 +385,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
if (uprobes) if (uprobes)
address = sym->start; address = sym->start;
else else
address = map->unmap_ip(map, sym->start); address = map->unmap_ip(map, sym->start) - map->reloc;
break; break;
} }
if (!address) { if (!address) {