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FROMLIST: arm64: disable function graph tracing with SCS

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The graph tracer hooks returns by modifying frame records on the
(regular) stack, but with SCS the return address is taken from the
shadow stack, and the value in the frame record has no effect. As we
don't currently have a mechanism to determine the corresponding slot
on the shadow stack (and to pass this through the ftrace
infrastructure), for now let's disable the graph tracer when SCS is
enabled.

Bug: 145210207
Change-Id: I65dd098be827121ecf0c08538b11e3b98f5eacde
(am from https://lore.kernel.org/patchwork/patch/1149057/)
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen
2018-09-05 15:23:18 -07:00
committed by Alistair Delva
parent e5438c0fea
commit acd44754dd
1 changed files with 1 additions and 1 deletions
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arch/arm64/Kconfig
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@@ -148,7 +148,7 @@ config ARM64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_GRAPH_TRACER if !SHADOW_CALL_STACK
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS
select HAVE_IRQ_TIME_ACCOUNTING