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mingw: enable DEP and ASLR

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Enable DEP (Data Execution Prevention) and ASLR (Address Space Layout
Randomization) support. This applies to both 32bit and 64bit builds
and makes it substantially harder to exploit security holes in Git by
offering a much more unpredictable attack surface.

ASLR interferes with GDB's ability to set breakpoints. A similar issue
holds true when compiling with -O2 (in which case single-stepping is
messed up because GDB cannot map the code back to the original source
code properly). Therefore we simply enable ASLR only when an
optimization flag is present in the CFLAGS, using it as an indicator
that the developer does not want to debug in GDB anyway.

Signed-off-by: İsmail Dönmez <ismail@i10z.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
İsmail Dönmez 2019-05-08 04:30:59 -07:00 committed by Junio C Hamano
parent 598b6c3a92
commit ce6a158561
1 changed files with 6 additions and 0 deletions
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6
config.mak.uname
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@ -575,6 +575,12 @@ else
ifneq ($(shell expr "$(uname_R)" : '1\.'),2)
# MSys2
prefix = /usr/
# Enable DEP
BASIC_LDFLAGS += -Wl,--nxcompat
# Enable ASLR (unless debugging)
ifneq (,$(findstring -O,$(filter-out -O0 -Og,$(CFLAGS))))
BASIC_LDFLAGS += -Wl,--dynamicbase
endif
ifeq (MINGW32,$(MSYSTEM))
prefix = /mingw32
HOST_CPU = i686