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linux/mm/kasan
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Kefeng Wang 3252b1d830 kasan: arm64: fix pcpu_page_first_chunk crash with KASAN_VMALLOC 
With KASAN_VMALLOC and NEED_PER_CPU_PAGE_FIRST_CHUNK the kernel crashes:

  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.

[wangkefeng.wang@huawei.com: fix redefinition of 'kasan_populate_early_vm_area_shadow']
  Link: https://lkml.kernel.org/r/20211011123211.3936196-1-wangkefeng.wang@huawei.com

Link: https://lkml.kernel.org/r/20210910053354.26721-4-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Marco Elver <elver@google.com>		[KASAN]
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>	[KASAN]
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-11-06 13:30:37 -07:00
..
common.c kasan: fix tag for large allocations when using CONFIG_SLAB 2021-11-06 13:30:33 -07:00
generic.c kasan: generic: introduce kasan_record_aux_stack_noalloc() 2021-11-06 13:30:33 -07:00
hw_tags.c Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
init.c kasan: use MAX_PTRS_PER_* for early shadow tables 2021-06-29 10:53:53 -07:00
kasan.h kasan: common: provide can_alloc in kasan_save_stack() 2021-11-06 13:30:33 -07:00
Makefile kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
quarantine.c mm: fix typos in comments 2021-05-07 00:26:35 -07:00
report.c mm/kasan: move kasan.fault to mm/kasan/report.c 2021-09-03 09:58:14 -07:00
report_generic.c mm/kasan: switch from strlcpy to strscpy 2021-04-30 11:20:41 -07:00
report_hw_tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
report_sw_tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
report_tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00
shadow.c kasan: arm64: fix pcpu_page_first_chunk crash with KASAN_VMALLOC 2021-11-06 13:30:37 -07:00
sw_tags.c Merge branch 'akpm' (patches from Andrew) 2021-06-29 17:29:11 -07:00
tags.c kasan: integrate the common part of two KASAN tag-based modes 2021-06-29 10:53:53 -07:00