From 6b4b63a571d7e12042d661852f034ff413ec25a7 Mon Sep 17 00:00:00 2001 From: Romain Naour Date: Tue, 1 Jun 2021 21:00:21 +0200 Subject: [PATCH] Config.in: disable PIC/PIE for Nios2 Recently in Buildroot the option BR2_PIC_PIE has been enabled by default along with other hardening features [1]. Since then the nios2 defconfig qemu_nios2_10m50_defconfig is failing to boot due to a segfault in init program: Run /init as init process with arguments: /init with environment: HOME=/ TERM=linux Failed to execute /init (error -12) See Buildroot build log and Qemu runtime test log in build artifacts [2]. Analyzing one of the binary with strace show that the problem occur very early when starting the new process: # strace ./busybox execve("./busybox", ["./busybox"], 0x7f91ce90 /* 10 vars */) = -1 ENOMEM (Cannot allocate memory) +++ killed by SIGSEGV +++ Several binutils/glibc/gcc version has been tested without any success. The issue has been reported to the glibc mailing list but it can be a linker or kernel bug [3]. For the Buildroot 2021.05 release, disable BR2_PIC_PIE until the problem is found and fixed. Fixes: https://gitlab.com/buildroot.org/buildroot/-/jobs/1285145889 [1] https://git.buildroot.net/buildroot/commit/?id=810ba387bec3c5b6904e8893fb4cb6f9d3717466 [2] https://gitlab.com/buildroot.org/buildroot/-/jobs/1285145889 [3] https://sourceware.org/pipermail/libc-alpha/2021-May/126912.html Signed-off-by: Romain Naour Cc: Yann E. MORIN Signed-off-by: Arnout Vandecappelle (Essensium/Mind) --- Config.in | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Config.in b/Config.in index c65e34bd5e..d9be677c21 100644 --- a/Config.in +++ b/Config.in @@ -716,6 +716,8 @@ comment "Security Hardening Options" config BR2_PIC_PIE bool "Build code with PIC/PIE" default y + # Nios2 toolchains produce non working binaries with -fPIC + depends on !BR2_nios2 depends on BR2_SHARED_LIBS depends on BR2_TOOLCHAIN_SUPPORTS_PIE help @@ -723,6 +725,7 @@ config BR2_PIC_PIE Position-Independent Executables (PIE). comment "PIC/PIE needs a toolchain w/ PIE" + depends on !BR2_nios2 depends on BR2_SHARED_LIBS depends on !BR2_TOOLCHAIN_SUPPORTS_PIE @@ -813,6 +816,7 @@ config BR2_RELRO_PARTIAL config BR2_RELRO_FULL bool "Full" + depends on !BR2_nios2 # BR2_PIC_PIE depends on BR2_TOOLCHAIN_SUPPORTS_PIE select BR2_PIC_PIE help @@ -821,6 +825,7 @@ config BR2_RELRO_FULL program loading, i.e every time an executable is started. comment "RELRO Full needs a toolchain w/ PIE" + depends on !BR2_nios2 depends on !BR2_TOOLCHAIN_SUPPORTS_PIE endchoice -- 2.30.2