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build: enable full RELRO in LDFLAGS

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This forces the ELF loader to resolve all relocations immediately at
load time rather than allowing lazy binding.

Therefore the loader can make the GOT (global offset table) read-only
once the relocations are complete during the loading process.

Change-Id: I89a878d1060ce79d58c5be7700d8b122a33a8ceb
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2015-10-12 16:17:37 -07:00
parent 2a3d4b18ca
commit 92a7dba668
1 changed files with 4 additions and 0 deletions
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4
mk/spdk.common.mk
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@ -45,6 +45,10 @@ OS := $(shell uname)
COMMON_CFLAGS = -g $(C_OPT) -Wall -Werror -fno-strict-aliasing -march=native -m64 -I$(SPDK_ROOT_DIR)/include COMMON_CFLAGS = -g $(C_OPT) -Wall -Werror -fno-strict-aliasing -march=native -m64 -I$(SPDK_ROOT_DIR)/include
# Enable full RELRO - no lazy relocation (resolve everything at load time).
# This allows the GOT to be made read-only early in the loading process.
LDFLAGS += -Wl,-z,relro,-z,now
ifeq ($(OS),FreeBSD) ifeq ($(OS),FreeBSD)
LIBS += -L/usr/local/lib LIBS += -L/usr/local/lib
COMMON_CFLAGS += -I/usr/local/include COMMON_CFLAGS += -I/usr/local/include