From: liuwenliang@huawei.com (Liuwenliang (Lamb))
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 01/11] Initialize the mapping of KASan shadow memory
Date: Thu, 19 Oct 2017 06:52:54 +0000 [thread overview]
Message-ID: <B8AC3E80E903784988AB3003E3E97330C005CCBC@dggemm510-mbx.china.huawei.com> (raw)
In-Reply-To: <31b16c9d-48c7-bc0a-51d1-cc6cf892329b@gmail.com>
On 2017.10.12 7:43AM Dmitry Osipenko [mailto:digetx at gmail.com] wrote:
>Shouldn't all __pgprot's contain L_PTE_MT_WRITETHROUGH ?
>
>[...]
>
>--
>Dmitry
Thanks for your review. I'm sorry that my replay is so late.
I don't think L_PTE_MT_WRITETHROUGH is need for all arm soc. So I think kasan's
mapping can use PAGE_KERNEL which can be initialized for different arm soc and
__pgprot(pgprot_val(PAGE_KERNEL) | L_PTE_RDONLY)).
I don't think the mapping table flags in kasan_early_init need be changed because of the follow reason:
1) PAGE_KERNEL can't be used in early_kasan_init because the pgprot_kernel which is used to define
PAGE_KERNEL doesn't be initialized.
2) all of the kasan shadow's mapping table is going to be created again in kasan_init function.
All what I say is: I think only the mapping table flags in kasan_init function need to be changed into PAGE_KERNEL
or __pgprot(pgprot_val(PAGE_KERNEL) | L_PTE_RDONLY)).
Here is the code, I has already tested:
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -124,7 +124,7 @@ pte_t * __meminit kasan_pte_populate(pmd_t *pmd, unsigned long addr, int node)
void *p = kasan_alloc_block(PAGE_SIZE, node);
if (!p)
return NULL;
- entry = pfn_pte(virt_to_pfn(p), __pgprot(_L_PTE_DEFAULT | L_PTE_DIRTY | L_PTE_XN));
+ entry = pfn_pte(virt_to_pfn(p), __pgprot(pgprot_val(PAGE_KERNEL)));
set_pte_at(&init_mm, addr, pte, entry);
}
return pte;
@@ -253,7 +254,7 @@ void __init kasan_init(void)
set_pte_at(&init_mm, KASAN_SHADOW_START + i*PAGE_SIZE,
&kasan_zero_pte[i], pfn_pte(
virt_to_pfn(kasan_zero_page),
- __pgprot(_L_PTE_DEFAULT | L_PTE_DIRTY | L_PTE_XN | L_PTE_RDONLY)));
+ __pgprot(pgprot_val(PAGE_KERNEL) | L_PTE_RDONLY)));
memset(kasan_zero_page, 0, PAGE_SIZE);
cpu_set_ttbr0(orig_ttbr0);
flush_cache_all();
next prev parent reply other threads:[~2017-10-19 6:52 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 8:22 [PATCH 00/11] KASan for arm Abbott Liu
2017-10-11 8:22 ` [PATCH 01/11] Initialize the mapping of KASan shadow memory Abbott Liu
2017-10-11 19:39 ` Florian Fainelli
2017-10-11 21:41 ` Russell King - ARM Linux
2017-10-17 13:28 ` Liuwenliang (Lamb)
2017-10-11 23:42 ` Dmitry Osipenko
2017-10-19 6:52 ` Liuwenliang (Lamb) [this message]
2017-10-19 12:01 ` Russell King - ARM Linux
2018-02-26 13:09 ` 答复: " Liuwenliang (Abbott Liu)
2017-10-12 7:58 ` Marc Zyngier
2017-11-09 7:46 ` Liuwenliang (Abbott Liu)
2017-11-09 10:10 ` Marc Zyngier
2017-11-15 10:20 ` Liuwenliang (Abbott Liu)
2017-11-15 10:35 ` Marc Zyngier
2017-11-15 13:16 ` Liuwenliang (Abbott Liu)
2017-11-15 13:54 ` Marc Zyngier
2017-11-16 3:07 ` Liuwenliang (Abbott Liu)
2017-11-16 9:54 ` Marc Zyngier
2017-11-16 14:24 ` Liuwenliang (Abbott Liu)
2017-11-16 14:40 ` Marc Zyngier
2017-11-17 1:39 ` 答复: " Liuwenliang (Abbott Liu)
2017-11-17 7:18 ` Liuwenliang (Abbott Liu)
2017-11-17 7:35 ` Christoffer Dall
2017-11-18 10:40 ` Liuwenliang (Abbott Liu)
2017-11-18 13:48 ` Marc Zyngier
2017-11-21 7:59 ` 答复: " Liuwenliang (Abbott Liu)
2017-11-21 9:40 ` Russell King - ARM Linux
2017-11-21 9:46 ` Marc Zyngier
2017-11-21 12:29 ` Mark Rutland
2017-11-22 12:56 ` Liuwenliang (Abbott Liu)
2017-11-22 13:06 ` Marc Zyngier
2017-11-23 1:54 ` Liuwenliang (Abbott Liu)
2017-11-23 15:22 ` Russell King - ARM Linux
2017-11-27 1:23 ` Liuwenliang (Abbott Liu)
2017-11-23 15:31 ` Mark Rutland
2017-11-27 1:26 ` 答复: " Liuwenliang (Abbott Liu)
2017-10-19 11:09 ` Russell King - ARM Linux
2018-02-24 14:28 ` Liuwenliang (Abbott Liu)
2017-10-11 8:22 ` [PATCH 02/11] replace memory function Abbott Liu
2017-10-19 12:05 ` Russell King - ARM Linux
2017-10-22 12:42 ` 答复: " Liuwenliang (Lamb)
2017-10-11 8:22 ` [PATCH 03/11] arm: Kconfig: enable KASan Abbott Liu
2017-10-11 19:15 ` Florian Fainelli
2017-10-19 12:34 ` Russell King - ARM Linux
2017-10-22 12:27 ` Liuwenliang (Lamb)
2017-10-11 8:22 ` [PATCH 04/11] Define the virtual space of KASan's shadow region Abbott Liu
2017-10-14 11:41 ` kbuild test robot
2017-10-16 11:42 ` Liuwenliang (Lamb)
2017-10-16 12:14 ` Ard Biesheuvel
2017-10-17 11:27 ` Liuwenliang (Lamb)
2017-10-17 11:52 ` Ard Biesheuvel
2017-10-17 13:02 ` Liuwenliang (Lamb)
2017-10-19 12:43 ` Russell King - ARM Linux
2017-10-22 12:12 ` Liuwenliang (Lamb)
2017-10-19 12:41 ` Russell King - ARM Linux
2017-10-19 12:40 ` Russell King - ARM Linux
2017-10-11 8:22 ` [PATCH 05/11] Disable kasan's instrumentation Abbott Liu
2017-10-11 19:16 ` Florian Fainelli
2017-10-19 12:47 ` Russell King - ARM Linux
2017-11-15 10:19 ` Liuwenliang (Abbott Liu)
2017-10-11 8:22 ` [PATCH 06/11] change memory_is_poisoned_16 for aligned error Abbott Liu
2017-10-11 23:23 ` Andrew Morton
2017-10-12 7:16 ` Dmitry Vyukov
2017-10-12 11:27 ` Liuwenliang (Lamb)
2017-10-19 12:51 ` Russell King - ARM Linux
2017-12-05 14:19 ` Liuwenliang (Abbott Liu)
2017-12-05 17:08 ` Ard Biesheuvel
2017-10-11 8:22 ` [PATCH 07/11] Avoid cleaning the KASan shadow area's mapping table Abbott Liu
2017-10-11 8:22 ` [PATCH 08/11] Add support arm LPAE Abbott Liu
2017-10-11 8:22 ` [PATCH 09/11] Don't need to map the shadow of KASan's shadow memory Abbott Liu
2017-10-19 12:55 ` Russell King - ARM Linux
2017-10-22 12:31 ` Liuwenliang (Lamb)
2017-10-11 8:22 ` [PATCH 10/11] Change mapping of kasan_zero_page int readonly Abbott Liu
2017-10-11 19:19 ` Florian Fainelli
2017-10-11 8:22 ` [PATCH 11/11] Add KASan layout Abbott Liu
2017-10-11 19:13 ` [PATCH 00/11] KASan for arm Florian Fainelli
2017-10-11 19:50 ` Florian Fainelli
[not found] ` <44c86924-930b-3eff-55b8-b02c9060ebe3@gmail.com>
2017-10-11 22:10 ` Laura Abbott
2017-10-11 22:58 ` Russell King - ARM Linux
2017-10-17 12:41 ` Liuwenliang (Lamb)
2017-10-12 4:55 ` Liuwenliang (Lamb)
2017-10-12 7:38 ` Arnd Bergmann
2017-10-17 1:04 ` 答复: " Liuwenliang (Lamb)
2018-02-13 18:40 ` Florian Fainelli
2018-02-23 2:10 ` Liuwenliang (Abbott Liu)
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