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Date: Mon, 10 Dec 2018 13:12:23 +0100
From: Andrey Konovalov <andreyknvl@...gle.com>
To: paul.gortmaker@...driver.com
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Christoph Lameter <cl@...ux.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mark Rutland <mark.rutland@....com>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Marc Zyngier <marc.zyngier@....com>,
Dave Martin <dave.martin@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Ingo Molnar <mingo@...nel.org>,
Paul Lawrence <paullawrence@...gle.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Arnd Bergmann <arnd@...db.de>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kate Stewart <kstewart@...uxfoundation.org>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
kasan-dev <kasan-dev@...glegroups.com>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
linux-sparse@...r.kernel.org,
Linux Memory Management List <linux-mm@...ck.org>,
Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
Kostya Serebryany <kcc@...gle.com>,
Evgenii Stepanov <eugenis@...gle.com>,
Lee Smith <Lee.Smith@....com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
Jacob Bramley <Jacob.Bramley@....com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
Jann Horn <jannh@...gle.com>,
Mark Brand <markbrand@...gle.com>,
Chintan Pandya <cpandya@...eaurora.org>,
Vishwath Mohan <vishwath@...gle.com>,
Linux-Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: [PATCH v13 08/25] kasan: initialize shadow to 0xff for tag-based mode
On Mon, Dec 10, 2018 at 2:35 AM Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
>
> On Thu, Dec 6, 2018 at 7:25 AM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>>
>> A tag-based KASAN shadow memory cell contains a memory tag, that
>> corresponds to the tag in the top byte of the pointer, that points to that
>> memory. The native top byte value of kernel pointers is 0xff, so with
>> tag-based KASAN we need to initialize shadow memory to 0xff.
>>
>> Reviewed-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
>> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
>> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
>> ---
>> arch/arm64/mm/kasan_init.c | 15 +++++++++++++--
>> include/linux/kasan.h | 8 ++++++++
>
>
> The version of this in linux-next breaks arm64 allmodconfig for me:
>
> mm/kasan/common.c: In function ‘kasan_module_alloc’:
> mm/kasan/common.c:481:17: error: ‘KASAN_SHADOW_INIT’ undeclared (first use in this function)
> __memset(ret, KASAN_SHADOW_INIT, shadow_size);
> ^
> mm/kasan/common.c:481:17: note: each undeclared identifier is reported only once for each function it appears in
> make[3]: *** [mm/kasan/common.o] Error 1
> make[3]: *** Waiting for unfinished jobs....
> make[2]: *** [mm/kasan] Error 2
> make[2]: *** Waiting for unfinished jobs....
> make[1]: *** [mm/] Error 2
> make: *** [sub-make] Error 2
Hi Paul,
This is my bad, this should be fixed in v13 of this patchset, which is
in mm right now but not in linux-next yet as it seems.
Thanks!
>
> An automated git bisect-run points at this:
>
> 5c36287813721999e79ac76f637f1ba7e5054402 is the first bad commit
> commit 5c36287813721999e79ac76f637f1ba7e5054402
> Author: Andrey Konovalov <andreyknvl@...gle.com>
> Date: Wed Dec 5 11:13:21 2018 +1100
>
> kasan: initialize shadow to 0xff for tag-based mode
>
> A quick look at the commit makes me think that the case where the
> "# CONFIG_KASAN_GENERIC is not set" has not been handled.
>
> I'm using an older gcc 4.8.3 - only used for build testing.
>
> Paul.
> --
>
>> mm/kasan/common.c | 3 ++-
>> 3 files changed, 23 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
>> index 4ebc19422931..7a4a0904cac8 100644
>> --- a/arch/arm64/mm/kasan_init.c
>> +++ b/arch/arm64/mm/kasan_init.c
>> @@ -43,6 +43,15 @@ static phys_addr_t __init kasan_alloc_zeroed_page(int node)
>> return __pa(p);
>> }
>>
>> +static phys_addr_t __init kasan_alloc_raw_page(int node)
>> +{
>> + void *p = memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE,
>> + __pa(MAX_DMA_ADDRESS),
>> + MEMBLOCK_ALLOC_ACCESSIBLE,
>> + node);
>> + return __pa(p);
>> +}
>> +
>> static pte_t *__init kasan_pte_offset(pmd_t *pmdp, unsigned long addr, int node,
>> bool early)
>> {
>> @@ -92,7 +101,9 @@ static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
>> do {
>> phys_addr_t page_phys = early ?
>> __pa_symbol(kasan_early_shadow_page)
>> - : kasan_alloc_zeroed_page(node);
>> + : kasan_alloc_raw_page(node);
>> + if (!early)
>> + memset(__va(page_phys), KASAN_SHADOW_INIT, PAGE_SIZE);
>> next = addr + PAGE_SIZE;
>> set_pte(ptep, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL));
>> } while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep)));
>> @@ -239,7 +250,7 @@ void __init kasan_init(void)
>> pfn_pte(sym_to_pfn(kasan_early_shadow_page),
>> PAGE_KERNEL_RO));
>>
>> - memset(kasan_early_shadow_page, 0, PAGE_SIZE);
>> + memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE);
>> cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
>>
>> /* At this point kasan is fully initialized. Enable error messages */
>> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
>> index ec22d548d0d7..c56af24bd3e7 100644
>> --- a/include/linux/kasan.h
>> +++ b/include/linux/kasan.h
>> @@ -153,6 +153,8 @@ static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
>>
>> #ifdef CONFIG_KASAN_GENERIC
>>
>> +#define KASAN_SHADOW_INIT 0
>> +
>> void kasan_cache_shrink(struct kmem_cache *cache);
>> void kasan_cache_shutdown(struct kmem_cache *cache);
>>
>> @@ -163,4 +165,10 @@ static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
>>
>> #endif /* CONFIG_KASAN_GENERIC */
>>
>> +#ifdef CONFIG_KASAN_SW_TAGS
>> +
>> +#define KASAN_SHADOW_INIT 0xFF
>> +
>> +#endif /* CONFIG_KASAN_SW_TAGS */
>> +
>> #endif /* LINUX_KASAN_H */
>> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
>> index 5f68c93734ba..7134e75447ff 100644
>> --- a/mm/kasan/common.c
>> +++ b/mm/kasan/common.c
>> @@ -473,11 +473,12 @@ int kasan_module_alloc(void *addr, size_t size)
>>
>> ret = __vmalloc_node_range(shadow_size, 1, shadow_start,
>> shadow_start + shadow_size,
>> - GFP_KERNEL | __GFP_ZERO,
>> + GFP_KERNEL,
>> PAGE_KERNEL, VM_NO_GUARD, NUMA_NO_NODE,
>> __builtin_return_address(0));
>>
>> if (ret) {
>> + __memset(ret, KASAN_SHADOW_INIT, shadow_size);
>> find_vm_area(addr)->flags |= VM_KASAN;
>> kmemleak_ignore(ret);
>> return 0;
>> --
>> 2.20.0.rc1.387.gf8505762e3-goog
>>
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