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Config.in: enable FORTIFY_SOURCE, PIC/PIE, RELRO, SSP by default

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Enhance security by enabling FORTIFY_SOURCE, PIC/PIE, RELRO and SSP by
default.

For SSP, SSP-all can have a significant impact on performance, so we do
not want to enable that unconditionally; instead we use SSP-strong if
available (since gcc-4.9), and resort to SSP-regular otherwise. People
who really, like really-really want to use SSP-all will still have to
enable it explicitly.

For FORTIFY, level 2 may change the behaviour of some glibc functions,
so may crash conforming programs, so may have adverse effects. As such,
we choose level 1 as the default, as it does not change the behaviour
of any function.

This could help making IoT more secure and fight against the assumption
that buildroot does not support binary hardening (see
https://cyber-itl.org/2019/08/26/iot-data-writeup.html)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr:
  - relax SSP to strong when available, regular otherwise
  - extend commit log to explain why SSP-all is not used
  - extend commit log to explain why FORTIFY level 2 is not used
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Fabrice Fontaine 2021-05-03 20:22:41 +02:00 committed by Yann E. MORIN
parent 281e5af348
commit 810ba387be
1 changed files with 7 additions and 1 deletions
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8
Config.in
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@ -715,6 +715,7 @@ comment "Security Hardening Options"
config BR2_PIC_PIE
bool "Build code with PIC/PIE"
default y
depends on BR2_SHARED_LIBS
depends on BR2_TOOLCHAIN_SUPPORTS_PIE
help
@ -727,7 +728,9 @@ comment "PIC/PIE needs a toolchain w/ PIE"
choice
bool "Stack Smashing Protection"
default BR2_SSP_ALL if BR2_ENABLE_SSP # legacy
default BR2_SSP_ALL if BR2_ENABLE_SSP
default BR2_SSP_STRONG if BR2_TOOLCHAIN_HAS_SSP_STRONG
default BR2_SSP_REGULAR
depends on BR2_TOOLCHAIN_HAS_SSP
help
Enable stack smashing protection support using GCC's
@ -789,6 +792,8 @@ comment "Stack Smashing Protection needs a toolchain w/ SSP"
choice
bool "RELRO Protection"
default BR2_RELRO_FULL if BR2_TOOLCHAIN_SUPPORTS_PIE
default BR2_RELRO_PARTIAL
depends on BR2_SHARED_LIBS
help
Enable a link-time protection know as RELRO (RELocation Read
@ -825,6 +830,7 @@ comment "RELocation Read Only (RELRO) needs shared libraries"
choice
bool "Buffer-overflow Detection (FORTIFY_SOURCE)"
default BR2_FORTIFY_SOURCE_1
depends on BR2_TOOLCHAIN_USES_GLIBC
depends on !BR2_OPTIMIZE_0
help