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build: supply -Wl,--high-entropy-va

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This should enable high-entropy ASLR on 64-bit targets, for better
mitigation of exploits.
This commit is contained in:
Wladimir J. van der Laan 2016-06-23 16:54:28 +02:00
parent 9a75d29b6f
commit 62c291596b
1 changed files with 1 additions and 0 deletions
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configure.ac
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@ -488,6 +488,7 @@ if test x$use_hardening != xno; then
AX_CHECK_LINK_FLAG([[-Wl,--dynamicbase]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--dynamicbase"])
AX_CHECK_LINK_FLAG([[-Wl,--nxcompat]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--nxcompat"])
AX_CHECK_LINK_FLAG([[-Wl,--high-entropy-va]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--high-entropy-va"])
AX_CHECK_LINK_FLAG([[-Wl,-z,relro]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,relro"])
AX_CHECK_LINK_FLAG([[-Wl,-z,now]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,now"])