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Julien Dusser df0bd42fde build: add hardened builds with PIE (ASLR) support 
Introduce a configuration option to build a "hardened" OpenWrt with
ASLR PIE support.

Add new option PKG_ASLR_PIE to enable Address Space Layout Randomization (ASLR)
by building Position Independent Executables (PIE). This new option protects
against "return-to-text" attacks.

Busybox need a special care, link is done with ld, not gcc, leading to
unknown flags. Set BUSYBOX_DEFAULT_PIE instead and disable PKG_ASLR_PIE.

If other failing packages were found, PKG_ASLR_PIE:=0 should be added to
their Makefiles.

Original Work by: Yongkui Han <yonhan@cisco.com>
Signed-off-by: Julien Dusser <julien.dusser@free.fr>
 		6 years ago
..
Config-build.in build: add hardened builds with PIE (ASLR) support 6 years ago
Config-devel.in Config-devel.in: rename symbol KERNEL_GIT_BRANCH -> KERNEL_GIT_REF 6 years ago
Config-images.in config: support new symbol intro'd in kernel 4.12 7 years ago
Config-kernel.in kernel: allow disabling multicast routing support 7 years ago