From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Date: Wed, 5 Feb 2014 05:18:58 +0000 (+0000)
Subject: perf probe: Do not add offset twice to uprobe address
X-Git-Tag: v3.14-rc4~11^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=981a23792cd02631f8cd5dd65753208a44de5ae1;p=pandora-kernel.git

perf probe: Do not add offset twice to uprobe address

Fix perf-probe not to add offset value twice to uprobe probe address
when post processing.

The tevs[i].point.address struct member is the address of symbol+offset,
but current perf-probe adjusts the point.address by adding the offset.

As a result, the probe address becomes symbol+offset+offset. This may
cause unexpected code corruption. Urgent fix is needed.

Without this fix:
  ---
  # ./perf probe -x ./perf dso__load_vmlinux+4
  # ./perf probe -l
    probe_perf:dso__load_vmlinux (on 0x000000000006d2b8)
  # nm ./perf.orig | grep dso__load_vmlinux\$
  000000000046d0a0 T dso__load_vmlinux
  ---

You can see the given offset is 3 but the actual probed address is
dso__load_vmlinux+8.

With this fix:
  ---
  # ./perf probe -x ./perf dso__load_vmlinux+4
  # ./perf probe -l
    probe_perf:dso__load_vmlinux (on 0x000000000006d2b4)
  ---

Now the problem is fixed.

Note: This bug is introduced by
	commit fb7345bbf7fad9bf72ef63a19c707970b9685812

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "David A. Long" <dave.long@linaro.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20140205051858.6519.27314.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

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