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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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6
arch/s390/include/asm/setup.h
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@@ -147,6 +147,12 @@ extern void (*_machine_restart)(char *command);
extern void (*_machine_halt)(void);
extern void (*_machine_power_off)(void);
extern unsigned long __kaslr_offset;
static inline unsigned long kaslr_offset(void)
{
return __kaslr_offset;
}
#else /* __ASSEMBLY__ */
#define IPL_DEVICE (IPL_DEVICE_OFFSET)