On Tue, Oct 15, 2024 at 11:37:14PM +0200, Linus Walleij wrote:
> @@ -125,6 +126,12 @@ void __check_vmalloc_seq(struct mm_struct *mm)
> pgd_offset_k(VMALLOC_START),
> sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
> pgd_index(VMALLOC_START)));
> + if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
> + memcpy(pgd_offset(mm, (unsigned long)kasan_mem_to_shadow((void *)VMALLOC_START)),
> + pgd_offset_k((unsigned long)kasan_mem_to_shadow((void *)VMALLOC_START)),
> + sizeof(pgd_t) * (pgd_index((unsigned long)kasan_mem_to_shadow((void *)VMALLOC_END)) -
> + pgd_index((unsigned long)kasan_mem_to_shadow((void *)VMALLOC_START))));
Maybe the following would be more readable:
static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
{
return (unsigned long)kasan_mem_to_shadow((void *)addr);
}
static void memcpy_pgd(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
memcpy(pgd_offset(mm, start), pgd_offset_k(start),
sizeof(pgd_t) * (pgd_index(end) - pgd_index(start)));
}
seq = ...;
memcpy_pgd(mm, VMALLOC_START, VMALLOC_END);
if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
unsigned long start =
arm_kasan_mem_to_shadow(VMALLOC_START);
unsigned long end =
arm_kasan_mem_to_shadow(VMALLOC_END);
memcpy_pgd(mm, start, end);
> + }
?
--
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