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From ce720608d5933e62f77f2c2f216859cf4f06adf8 Mon Sep 17 00:00:00 2001
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From: Kairui Song <kasong@redhat.com>
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Date: Wed, 13 Feb 2019 00:03:51 +0800
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Subject: [PATCH] Fix eppic issue with hardening flags
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This is stash of two commits:
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commit f98cf5fe07f390554696755f0a5843f6bb9c4716
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Author: ryncsn <ryncsn@gmail.com>
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Date: Tue Mar 19 13:39:25 2019 +0800
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Tell gcc not to omit frame pointer
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After commit 0209874, it's now possible to enable optimization above O0.
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But eppic might call __builtin_return_address(1). With O1,
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-fomit-frame-pointer is enabled gcc may omit frame pointer.
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__builtin_return_address(1) relies on callee preserves RBP as the stack
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base, which is untrue if optimization is usded. In this case it may return
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wrong value or crash.
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In case of any potential failure, use -fno-omit-frame-pointer globally.
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Signed-off-by: Kairui Song <ryncsn@gmail.com>
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commit 0209874f4b46b8af5a2d42662ba6775cf5a1dc44
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Author: Kairui Song <kasong@redhat.com>
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Date: Wed Feb 13 00:03:51 2019 +0800
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Drop O0 CFLAGS override in Makefile
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Signed-off-by: Kairui Song <kasong@redhat.com>
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---
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libeppic/Makefile | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/libeppic/Makefile b/libeppic/Makefile
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index bcf2edf..8b97c87 100644
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--- a/eppic/libeppic/Makefile
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+++ b/eppic/libeppic/Makefile
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@@ -24,7 +24,7 @@ LDIRT = lex.eppic.c lex.eppicpp.c eppic.tab.c eppic.tab.h eppicpp.tab.c \
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LIBDIR = /usr/lib
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TARGETS = libeppic.a
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-CFLAGS += -O0 -g -fPIC
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+CFLAGS += -g -fno-omit-frame-pointer -fPIC
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ifeq ($(TARGET), PPC64)
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CFLAGS += -m64
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endif
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--
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2.20.1
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