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arm64: setup: introduce kaslr_offset()

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Introduce kaslr_offset() similar to x86_64 to fix kcov.

[ Updated by Will Deacon ]

Link: http://lkml.kernel.org/r/1481417456-28826-2-git-send-email-alex.popov@linux.com
Signed-off-by: Alexander Popov <alex.popov@linux.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Jon Masters <jcm@redhat.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Nicolai Stange <nicstange@gmail.com>
Cc: James Morse <james.morse@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Popov <alex.popov@linux.com>
Cc: syzkaller <syzkaller@googlegroups.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Popov 2016-12-19 16:23:06 -08:00 committed by Linus Torvalds
parent 4dd72b4a47
commit 7ede8665f2
2 changed files with 9 additions and 4 deletions
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5
arch/arm64/include/asm/memory.h
View File

@ -165,6 +165,11 @@ extern u64 kimage_vaddr;
/* the offset between the kernel virtual and physical mappings */
extern u64 kimage_voffset;
static inline unsigned long kaslr_offset(void)
{
return kimage_vaddr - KIMAGE_VADDR;
}
/*
* Allow all memory at the discovery stage. We will clip it later.
*/

8
arch/arm64/kernel/setup.c
View File

@ -338,11 +338,11 @@ subsys_initcall(topology_init);
static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
void *p)
{
u64 const kaslr_offset = kimage_vaddr - KIMAGE_VADDR;
const unsigned long offset = kaslr_offset();
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset > 0) {
pr_emerg("Kernel Offset: 0x%llx from 0x%lx\n",
kaslr_offset, KIMAGE_VADDR);
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
offset, KIMAGE_VADDR);
} else {
pr_emerg("Kernel Offset: disabled\n");
}