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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2019-02-03 21:37:20 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-29 10:47:10 +0200
commitb2d24b97b2a9691351920e700bfda4368c177232 (patch)
treeafc715c3029b79cf1430781ffcbe39ff0656cadb /arch/s390/Kconfig
parents390/kernel: introduce .dma sections (diff)
downloadlinux-dev-b2d24b97b2a9691351920e700bfda4368c177232.tar.xz
linux-dev-b2d24b97b2a9691351920e700bfda4368c177232.zip
s390/kernel: add support for kernel address space layout randomization (KASLR)
This patch adds support for relocating the kernel to a random address. The random kernel offset is obtained from cpacf, using either TRNG, PRNO, or KMC_PRNG, depending on supported MSA level. KERNELOFFSET is added to vmcoreinfo, for crash --kaslr support. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
-rw-r--r--arch/s390/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 4c99e4f5f366..8c15392ee985 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -637,6 +637,16 @@ config RELOCATABLE
The relocations make the kernel image about 15% larger (compressed
10%), but are discarded at runtime.
+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),
+ this randomizes the address at which the kernel image is loaded,
+ as a security feature that deters exploit attempts relying on
+ knowledge of the location of kernel internals.
+
endmenu
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