On 2021/10/13 2:17, Catalin Marinas wrote:
On Fri, Sep 10, 2021 at 01:33:54PM +0800, Kefeng Wang wrote:
With KASAN_VMALLOC and NEED_PER_CPU_PAGE_FIRST_CHUNK, it crashs,
Unable to handle kernel paging request at virtual address ffff7000028f2000
...
swapper pgtable: 64k pages, 48-bit VAs, pgdp=0000000042440000
[ffff7000028f2000] pgd=000000063e7c0003, p4d=000000063e7c0003, pud=000000063e7c0003, pmd=000000063e7b0003, pte=0000000000000000
Internal error: Oops: 96000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.0-rc4-00003-gc6e6e28f3f30-dirty #62
Hardware name: linux,dummy-virt (DT)
pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO BTYPE=--)
pc : kasan_check_range+0x90/0x1a0
lr : memcpy+0x88/0xf4
sp : ffff80001378fe20
...
Call trace:
kasan_check_range+0x90/0x1a0
pcpu_page_first_chunk+0x3f0/0x568
setup_per_cpu_areas+0xb8/0x184
start_kernel+0x8c/0x328
The vm area used in vm_area_register_early() has no kasan shadow memory,
Let's add a new kasan_populate_early_vm_area_shadow() function to populate
the vm area shadow memory to fix the issue.
Acked-by: Marco Elver <elver@xxxxxxxxxx> (for KASAN parts)
Acked-by: Andrey Konovalov <andreyknvl@xxxxxxxxx> (for KASAN parts)
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
It looks like I only acked patch 2 previously, so here it is:
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Many thanks, Catalin :)
.
