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configure: Support for HEASLR on mingw targets

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The appropriate flag for HEASLR (--high-entropy-va) was added in
binutils 2.25.

Also set the image base >4GB so higher entropy gets applied to image
base randomization when used with HEASLR (8 -> 17 bits of
randomization).  Windows does this for compatibility because of "latent
pointer truncation issues".

Signed-off-by: Alex Smith <alex.smith@warpsharp.info>
This commit is contained in:
Alex Smith 2015-09-26 02:43:23 -04:00 committed by Hendrik Leppkes
parent 238ca2d723
commit a58c22d612
1 changed files with 4 additions and 0 deletions
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4
configure vendored
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@ -4400,6 +4400,10 @@ case $target_os in
add_ldexeflags -Wl,--pic-executable,-e,_mainCRTStartup
elif enabled x86_64; then
add_ldexeflags -Wl,--pic-executable,-e,mainCRTStartup
check_ldflags -Wl,--high-entropy-va # binutils 2.25
# Set image base >4GB for extra entropy with HEASLR
add_ldexeflags -Wl,--image-base,0x140000000
append SHFLAGS -Wl,--image-base,0x180000000
fi
;;
win32|win64)