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Hardening compiler flags #578

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Jan 30, 2020
Merged

Hardening compiler flags #578

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18 changes: 17 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -247,7 +247,23 @@ endif
endif
endif

CFLAGS += -O2 -fno-omit-frame-pointer -g
CFLAGS += -O2 -g
# Get better runtime backtraces by preserving the frame pointer. This eats
# one of seven precious registers on x86, but our functions are quite large
# so they almost always use stack and need the frame pointer anyway.
CFLAGS += -fno-omit-frame-pointer
# Enable runtime stack canaries for functions to guard for buffer overflows.
ifeq (yes,$(call supported,-fstack-protector-strong))
CFLAGS += -fstack-protector-strong
else
CFLAGS += -fstack-protector
endif
# Enable miscellaneous compile-time checks in standard library usage.
CFLAGS += -D_FORTIFY_SOURCE=2
# Prevent global offset table overwrite attacks.
ifdef IS_LINUX
LDFLAGS += -Wl,-z,relro -Wl,-z,now
endif

ifdef COVERAGE
CFLAGS += -O0 --coverage
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