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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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3
arch/s390/boot/boot.h
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@@ -9,6 +9,9 @@ void setup_boot_command_line(void);
void parse_boot_command_line(void);
void setup_memory_end(void);
void print_missing_facilities(void);
unsigned long get_random_base(unsigned long safe_addr);
extern int kaslr_enabled;
unsigned long read_ipl_report(unsigned long safe_offset);