7b3fcbcdaa
TF-A supports stack smashing protection (-fstack-protector-*). However, that feature is currently silently disabled because ENABLE_STACK_PROTECTOR is not set during build time. As documented in the TF-A user guide, the flag ENABLE_STACK_PROTECTOR is required to enable stack protection support. When enabled the symbols for the stack protector (e.g. __stack_chk_guard) are built. This needs to be done because TF-A does not link against an external library that provides that symbols (e.g. libc). So in case we see that BR2_SSP_* is enabled, let's enable the corresponding ENABLE_STACK_PROTECTOR build flag for TF-A as documented in the TF-A user guide. This patch also fixes a the following linker errors with older TF-A versions if BR2_SSP_* is enabled (i.e. -fstack-protector-* is used as compiler flag) and ENABLE_STACK_PROTECTOR is not set, which are caused by the missing stack protector symbols: [...] params_setup.c:(.text.params_early_setup+0xc): undefined reference to `__stack_chk_guard' aarch64-none-linux-gnu-ld: params_setup.c:(.text.params_early_setup+0x14): undefined reference to `__stack_chk_guard' aarch64-none-linux-gnu-ld: params_setup.c:(.text.params_early_setup+0x104): undefined reference to `__stack_chk_guard' aarch64-none-linux-gnu-ld: params_setup.c:(.text.params_early_setup+0x118): undefined reference to `__stack_chk_fail' aarch64-none-linux-gnu-ld: ./build/px30/release/bl31/pmu.o: in function `rockchip_soc_sys_pwr_dm_suspend': pmu.c:(.text.rockchip_soc_sys_pwr_dm_suspend+0xc): undefined reference to `__stack_chk_guard' [...] TF-A releases after Nov 2019, that include 7af195e29a4, will circumvent these issue by explicitliy and silently disabling the stack protector by appending '-fno-stack-protector' to the compiler flags in case ENABLE_STACK_PROTECTOR is not set. Tested on a Rockchip PX30 based system (TF-A v2.2 and upstream/master). Signed-off-by: Christoph Müllner <christoph.muellner@theobroma-systems.com> Reviewed-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> |
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| linux | ||
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| system | ||
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| utils | ||
| .defconfig | ||
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| .gitlab-ci.yml | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
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