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| author |   Kefeng Wang <wangkefeng.wang@huawei.com> | 2021-11-05 13:39:47 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-06 13:30:37 -0700 |
| commit | 3252b1d8309ea42bc6329d9341072ecf1c9505c0 (patch) | |
| tree | e55752081a97cca77027c9191612c24029ebde1c /mm/vmalloc.c | |
| parent | arm64: support page mapping percpu first chunk allocator (diff) | |
| download | wireguard-linux-3252b1d8309ea42bc6329d9341072ecf1c9505c0.tar.xz wireguard-linux-3252b1d8309ea42bc6329d9341072ecf1c9505c0.zip | |
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>
Diffstat (limited to 'mm/vmalloc.c')
| -rw-r--r-- | mm/vmalloc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 74da45a8beec..75fa100f5424 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2291,6 +2291,7 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align) vm->addr = (void *)addr; vm->next = *p; *p = vm; + kasan_populate_early_vm_area_shadow(vm->addr, vm->size); } static void vmap_init_free_space(void) |