| Message ID | 20210910053354.26721-4-wangkefeng.wang@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | arm64: support page mapping percpu first chunk allocator | expand |
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@google.com> (for KASAN parts) > Acked-by: Andrey Konovalov <andreyknvl@gmail.com> (for KASAN parts) > Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> It looks like I only acked patch 2 previously, so here it is: Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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@google.com> (for KASAN parts) >> Acked-by: Andrey Konovalov <andreyknvl@gmail.com> (for KASAN parts) >> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> > > It looks like I only acked patch 2 previously, so here it is: > > Acked-by: Catalin Marinas <catalin.marinas@arm.com> Many thanks, Catalin :) > . >
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 61b52a92b8b6..5b996ca4d996 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -287,6 +287,22 @@ static void __init kasan_init_depth(void) init_task.kasan_depth = 0; } +#ifdef CONFIG_KASAN_VMALLOC +void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size) +{ + unsigned long shadow_start, shadow_end; + + if (!is_vmalloc_or_module_addr(start)) + return; + + shadow_start = (unsigned long)kasan_mem_to_shadow(start); + shadow_start = ALIGN_DOWN(shadow_start, PAGE_SIZE); + shadow_end = (unsigned long)kasan_mem_to_shadow(start + size); + shadow_end = ALIGN(shadow_end, PAGE_SIZE); + kasan_map_populate(shadow_start, shadow_end, NUMA_NO_NODE); +} +#endif + void __init kasan_init(void) { kasan_init_shadow(); diff --git a/include/linux/kasan.h b/include/linux/kasan.h index dd874a1ee862..859f1e724ee1 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -434,6 +434,8 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end); +void kasan_populate_early_vm_area_shadow(void *start, unsigned long size); + #else /* CONFIG_KASAN_VMALLOC */ static inline int kasan_populate_vmalloc(unsigned long start, @@ -451,6 +453,10 @@ static inline void kasan_release_vmalloc(unsigned long start, unsigned long free_region_start, unsigned long free_region_end) {} +static inline void kasan_populate_early_vm_area_shadow(void *start, + unsigned long size) +{ } + #endif /* CONFIG_KASAN_VMALLOC */ #if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \ diff --git a/mm/kasan/init.c b/mm/kasan/init.c index cc64ed6858c6..d39577d088a1 100644 --- a/mm/kasan/init.c +++ b/mm/kasan/init.c @@ -279,6 +279,11 @@ int __ref kasan_populate_early_shadow(const void *shadow_start, return 0; } +void __init __weak kasan_populate_early_vm_area_shadow(void *start, + unsigned long size) +{ +} + static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd) { pte_t *pte; diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 5ee3cbeffa26..4cb494447910 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2287,6 +2287,7 @@ 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)