perf tool: Fix perf stack to non executable on x86_64
authorJiri Olsa <jolsa@redhat.com>
Wed, 1 Feb 2012 12:54:08 +0000 (13:54 +0100)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 6 Feb 2012 21:14:17 +0000 (19:14 -0200)
commite89cef136a8b56eef1acf702591fd3039fc3385d
treef3d5eeee5a8e4172834e7e3a6b41dfcea10cf358
parent5ddf146f70a44ed4133dea4d377b172605a1cfa5
perf tool: Fix perf stack to non executable on x86_64

By adding following objects:
  bench/mem-memset-x86-64-asm.o
  bench/mem-memcpy-x86-64-asm.o
the x86_64 perf binary ended up with executable stack.

The reason was that above objects are assembler sourced and are missing the
GNU-stack note section. In such case the linker assumes that the final binary
should not be restricted at all and mark the stack as RWX.

Adding section ".note.GNU-stack" definition to mentioned objects, with all
flags disabled, thus omiting those objects from linker stack flags decision.

Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=783570
Reported-by: Clark Williams <williams@redhat.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1328100848-5630-1-git-send-email-jolsa@redhat.com
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
[ committer note: Remaining bits after what was already added to perf/urgent ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/bench/mem-memset-x86-64-asm.S