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| author | Julien Dusser <julien.dusser@free.fr> | 2018-01-08 23:47:06 +0100 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2018-01-27 16:46:45 +0100 |
| commit | df0bd42fdeb76c9bc51b816c3df699db123c0024 (patch) | |
| tree | 1057e289580397c014b2c9c4460057e9e7ac8367 /config | |
| parent | ca7e8627dbbbcae0d1bfacea51d9b564617195de (diff) | |
| download | upstream-df0bd42fdeb76c9bc51b816c3df699db123c0024.tar.gz upstream-df0bd42fdeb76c9bc51b816c3df699db123c0024.tar.bz2 upstream-df0bd42fdeb76c9bc51b816c3df699db123c0024.zip | |
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>
Diffstat (limited to 'config')
| -rw-r--r-- | config/Config-build.in | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/config/Config-build.in b/config/Config-build.in index 7ec7653a9a..660da1c47f 100644 --- a/config/Config-build.in +++ b/config/Config-build.in @@ -184,6 +184,22 @@ menu "Global build settings" this per package by adding PKG_CHECK_FORMAT_SECURITY:=0 in the package Makefile. + config PKG_ASLR_PIE + bool + prompt "User space ASLR PIE compilation" + select BUSYBOX_DEFAULT_PIE + default n + help + Add -fPIC to CFLAGS and -specs=hardened-build-ld to LDFLAGS. + This enables package build as Position Independent Executables (PIE) + to protect against "return-to-text" attacks. This belongs to the + feature of Address Space Layout Randomisation (ASLR), which is + implemented by the kernel and the ELF loader by randomising the + location of memory allocations. This makes memory addresses harder + to predict when an attacker is attempting a memory-corruption exploit. + You can disable this per package by adding PKG_ASLR_PIE:=0 in the package + Makefile. + choice prompt "User space Stack-Smashing Protection" depends on USE_MUSL |