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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
*/
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/printk.h>
#include <asm/cpufeature.h>
#include <asm/memory.h>
u16 __initdata memstart_offset_seed;
bool __ro_after_init __kaslr_is_enabled = false;
void __init kaslr_init(void)
{
if (cpuid_feature_extract_unsigned_field(arm64_sw_feature_override.val &
arm64_sw_feature_override.mask,
ARM64_SW_FEATURE_OVERRIDE_NOKASLR)) {
pr_info("KASLR disabled on command line\n");
return;
}
/*
* The KASLR offset modulo MIN_KIMG_ALIGN is taken from the physical
* placement of the image rather than from the seed, so a displacement
* of less than MIN_KIMG_ALIGN means that no seed was provided.
*/
if (kaslr_offset() < MIN_KIMG_ALIGN) {
pr_warn("KASLR disabled due to lack of seed\n");
return;
}
pr_info("KASLR enabled\n");
__kaslr_is_enabled = true;
}
static int __init parse_nokaslr(char *unused)
{
/* nokaslr param handling is done by early cpufeature code */
return 0;
}
early_param("nokaslr", parse_nokaslr);
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