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| author | Heiko Carstens <hca@linux.ibm.com> | 2022-10-30 19:22:02 +0100 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2022-11-08 19:32:32 +0100 |
| commit | 80ddf5ce1c9291cb175d52ed1227134ad48c47ee (patch) | |
| tree | e3a4a2661afdd032707d48b1f1353d024c0b5256 /arch/s390/Kconfig | |
| parent | 9afea696a04af29b114b38aec734e28b03e93dae (diff) | |
s390: always build relocatable kernel
Nathan Chancellor reported several link errors on s390 with
CONFIG_RELOCATABLE disabled, after binutils commit 906f69cf65da ("IBM
zSystems: Issue error for *DBL relocs on misaligned symbols"). The binutils
commit reveals potential miscompiles that might have happened already
before with linker script defined symbols at odd addresses.
A similar bug was recently fixed in the kernel with commit c9305b6c1f52
("s390: fix nospec table alignments").
See https://github.com/ClangBuiltLinux/linux/issues/1747 for an analysis
from Ulich Weigand.
Therefore always build a relocatable kernel to avoid this problem. There is
hardly any use-case for non-relocatable kernels, so this shouldn't be
controversial.
Link: https://github.com/ClangBuiltLinux/linux/issues/1747
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20221030182202.2062705-1-hca@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 318fce77601d..de575af02ffe 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -568,8 +568,7 @@ config EXPOLINE_FULL endchoice config RELOCATABLE - bool "Build a relocatable kernel" - default y + def_bool y help This builds a kernel image that retains relocation information so it can be loaded at an arbitrary address. @@ -578,10 +577,11 @@ config RELOCATABLE bootup process. The relocations make the kernel image about 15% larger (compressed 10%), but are discarded at runtime. + Note: this option exists only for documentation purposes, please do + not remove it. config RANDOMIZE_BASE bool "Randomize the address of the kernel image (KASLR)" - depends on RELOCATABLE default y help In support of Kernel Address Space Layout Randomization (KASLR), |