[PATCH 3.12 067/235] ftrace/x86: Set ftrace_stub to weak to prevent gcc from using short jumps to it

From: Jiri Slaby
Date: Fri Jan 27 2017 - 06:02:35 EST

From: Steven Rostedt <rostedt@xxxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


commit 8329e818f14926a6040df86b2668568bde342ebf upstream.

Matt Fleming reported seeing crashes when enabling and disabling
function profiling which uses function graph tracer. Later Namhyung Kim
hit a similar issue and he found that the issue was due to the jmp to
ftrace_stub in ftrace_graph_call was only two bytes, and when it was
changed to jump to the tracing code, it overwrote the ftrace_stub that
was after it.

Masami Hiramatsu bisected this down to a binutils change:

8dcea93252a9ea7dff57e85220a719e2a5e8ab41 is the first bad commit
commit 8dcea93252a9ea7dff57e85220a719e2a5e8ab41
Author: H.J. Lu <hjl.tools@xxxxxxxxx>
Date: Fri May 15 03:17:31 2015 -0700

Add -mshared option to x86 ELF assembler

This patch adds -mshared option to x86 ELF assembler. By default,
assembler will optimize out non-PLT relocations against defined non-weak
global branch targets with default visibility. The -mshared option tells
the assembler to generate code which may go into a shared library
where all non-weak global branch targets with default visibility can
be preempted. The resulting code is slightly bigger. This option
only affects the handling of branch instructions.

Declaring ftrace_stub as a weak call prevents gas from using two byte
jumps to it, which would be converted to a jump to the function graph

Link: http://lkml.kernel.org/r/20160516230035.1dbae571@xxxxxxxxxxxxxxxxxx

Reported-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Reported-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Tested-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
arch/x86/kernel/entry_64.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index ead3e7c9672e..ceb8d113938b 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -122,7 +122,8 @@ GLOBAL(ftrace_graph_call)
jmp ftrace_stub

+/* This is weak to keep gas from relaxing the jumps */