[Buildroot] [git commit] Config.in: disable PIC/PIE for Nios2
Arnout Vandecappelle (Essensium/Mind)
arnout at mind.be
Tue Jun 1 19:47:51 UTC 2021
commit: https://git.buildroot.net/buildroot/commit/?id=6b4b63a571d7e12042d661852f034ff413ec25a7
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
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 <romain.naour at gmail.com>
Cc: Yann E. MORIN <yann.morin.1998 at free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
---
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
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