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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>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches