This is a note to let you know that I've just added the patch titled
perf tools: Fix perf stack to non executable on x86_64
to the 3.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-tools-fix-perf-stack-to-non-executable-on-x86_64.patch
and it can be found in the queue-3.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 7a0153ee15575a4d07b5da8c96b79e0b0fd41a12 Mon Sep 17 00:00:00 2001
From: Jiri Olsa <[email protected]>
Date: Mon, 6 Feb 2012 18:54:06 -0200
Subject: perf tools: Fix perf stack to non executable on x86_64
From: Jiri Olsa <[email protected]>
commit 7a0153ee15575a4d07b5da8c96b79e0b0fd41a12 upstream.
By adding following objects:
bench/mem-memcpy-x86-64-asm.o
the x86_64 perf binary ended up with executable stack.
The reason was that above object are assembler sourced and is 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 object, with all
flags disabled, thus omiting this object from linker stack flags decision.
Problem introduced in:
$ git describe ea7872b
v2.6.37-rc2-19-gea7872b
Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=783570
Reported-by: Clark Williams <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Cc: Corey Ashford <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jiri Olsa <[email protected]>
[ committer note: Backported fix to perf/urgent (3.3-rc2+) ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
tools/perf/bench/mem-memcpy-x86-64-asm.S | 6 ++++++
1 file changed, 6 insertions(+)
--- a/tools/perf/bench/mem-memcpy-x86-64-asm.S
+++ b/tools/perf/bench/mem-memcpy-x86-64-asm.S
@@ -1,2 +1,8 @@
#include "../../../arch/x86/lib/memcpy_64.S"
+/*
+ * We need to provide note.GNU-stack section, saying that we want
+ * NOT executable stack. Otherwise the final linking will assume that
+ * the ELF stack should not be restricted at all and set it RWX.
+ */
+.section .note.GNU-stack,"",@progbits
Patches currently in stable-queue which might be from [email protected] are
queue-3.2/perf-tools-fix-perf-stack-to-non-executable-on-x86_64.patch
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