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s390/kernel: add support for kernel address space layout randomization (KASLR)

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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>
This commit is contained in:
Gerald Schaefer
2019-02-03 21:37:20 +01:00
committed by Martin Schwidefsky
parent a80313ff91
commit b2d24b97b2
9 changed files with 207 additions and 5 deletions
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1
arch/s390/kernel/machine_kexec.c
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@@ -255,6 +255,7 @@ void arch_crash_save_vmcoreinfo(void)
mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
vmcoreinfo_append_str("SDMA=%lx\n", __sdma);
vmcoreinfo_append_str("EDMA=%lx\n", __edma);
vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
}
void machine_shutdown(void)

1
arch/s390/kernel/setup.c
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@@ -108,6 +108,7 @@ unsigned long __bootdata_preserved(__stext_dma);
unsigned long __bootdata_preserved(__etext_dma);
unsigned long __bootdata_preserved(__sdma);
unsigned long __bootdata_preserved(__edma);
unsigned long __bootdata_preserved(__kaslr_offset);
unsigned long VMALLOC_START;
EXPORT_SYMBOL(VMALLOC_START);