From: Steve Capper <Steve.Capper@arm.com>
To: Will Deacon <will@kernel.org>
Cc: Mark Rutland <Mark.Rutland@arm.com>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Andrey Konovalov <andreyknvl@google.com>, Qian Cai <cai@lca.pw>,
nd <nd@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 2/8] arm64: memory: Ensure address tag is masked in conversion macros
Date: Tue, 13 Aug 2019 18:54:06 +0000 [thread overview]
Message-ID: <20190813185404.GC19835@capper-ampere.manchester.arm.com> (raw)
In-Reply-To: <20190813170149.26037-3-will@kernel.org>
On Tue, Aug 13, 2019 at 06:01:43PM +0100, Will Deacon wrote:
> When converting a linear virtual address to a physical address, pfn or
> struct page *, we must make sure that the tag bits are masked before the
> calculation otherwise we end up with corrupt pointers when running with
> CONFIG_KASAN_SW_TAGS=y:
>
> | Unable to handle kernel paging request at virtual address 0037fe0007580d08
> | [0037fe0007580d08] address between user and kernel address ranges
>
> Mask out the tag in __virt_to_phys_nodebug() and virt_to_page().
>
> Reported-by: Qian Cai <cai@lca.pw>
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Fixes: 9cb1c5ddd2c4 ("arm64: mm: Remove bit-masking optimisations for PAGE_OFFSET and VMEMMAP_START")
> Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Steve Capper <steve.capper@arm.com>
> ---
> arch/arm64/include/asm/memory.h | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
> index 442ab861cab8..47b4dc73b8bf 100644
> --- a/arch/arm64/include/asm/memory.h
> +++ b/arch/arm64/include/asm/memory.h
> @@ -252,7 +252,7 @@ static inline const void *__tag_set(const void *addr, u8 tag)
> #define __kimg_to_phys(addr) ((addr) - kimage_voffset)
>
> #define __virt_to_phys_nodebug(x) ({ \
> - phys_addr_t __x = (phys_addr_t)(x); \
> + phys_addr_t __x = (phys_addr_t)(__tag_reset(x)); \
> __is_lm_address(__x) ? __lm_to_phys(__x) : \
> __kimg_to_phys(__x); \
> })
> @@ -324,7 +324,8 @@ static inline void *phys_to_virt(phys_addr_t x)
> ((void *)__addr_tag); \
> })
>
> -#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) + VMEMMAP_START))
> +#define virt_to_page(vaddr) \
> + ((struct page *)((__virt_to_pgoff(__tag_reset(vaddr))) + VMEMMAP_START))
> #endif
>
> #define virt_addr_valid(addr) ({ \
> --
> 2.11.0
>
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next prev parent reply other threads:[~2019-08-13 18:54 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-13 17:01 [PATCH 0/8] Fix issues with 52-bit kernel virtual addressing Will Deacon
2019-08-13 17:01 ` [PATCH 1/8] arm64: memory: Fix virt_addr_valid() using __is_lm_address() Will Deacon
2019-08-13 18:09 ` Ard Biesheuvel
2019-08-13 19:11 ` Steve Capper
2019-08-13 19:25 ` Ard Biesheuvel
2019-08-13 20:34 ` Steve Capper
2019-08-14 15:17 ` Ard Biesheuvel
2019-08-14 8:32 ` Will Deacon
2019-08-13 18:53 ` Steve Capper
2019-08-14 9:19 ` Catalin Marinas
2019-08-14 9:48 ` Will Deacon
2019-08-14 10:40 ` Catalin Marinas
2019-08-14 12:02 ` Will Deacon
2019-08-13 17:01 ` [PATCH 2/8] arm64: memory: Ensure address tag is masked in conversion macros Will Deacon
2019-08-13 18:54 ` Steve Capper [this message]
2019-08-14 9:23 ` Catalin Marinas
2019-08-13 17:01 ` [PATCH 3/8] arm64: memory: Rewrite default page_to_virt()/virt_to_page() Will Deacon
2019-08-13 18:54 ` Steve Capper
2019-08-14 9:30 ` Catalin Marinas
2019-08-14 9:41 ` Will Deacon
2019-08-14 10:56 ` Mark Rutland
2019-08-14 11:17 ` Will Deacon
2019-08-14 11:26 ` Mark Rutland
2019-08-13 17:01 ` [PATCH 4/8] arm64: memory: Simplify virt_to_page() implementation Will Deacon
2019-08-13 18:55 ` Steve Capper
2019-08-14 9:32 ` Catalin Marinas
2019-08-13 17:01 ` [PATCH 5/8] arm64: memory: Simplify _VA_START and _PAGE_OFFSET definitions Will Deacon
2019-08-13 18:55 ` Steve Capper
2019-08-14 9:33 ` Catalin Marinas
2019-08-14 11:23 ` Mark Rutland
2019-08-14 12:00 ` Will Deacon
2019-08-14 13:18 ` Mark Rutland
2019-08-13 17:01 ` [PATCH 6/8] arm64: memory: Implement __tag_set() as common function Will Deacon
2019-08-13 18:56 ` Steve Capper
2019-08-14 9:34 ` Catalin Marinas
2019-08-13 17:01 ` [PATCH 7/8] arm64: memory: Add comments to end of non-trivial #ifdef blocks Will Deacon
2019-08-13 18:57 ` Steve Capper
2019-08-14 9:35 ` Catalin Marinas
2019-08-13 17:01 ` [PATCH 8/8] arm64: memory: Cosmetic cleanups Will Deacon
2019-08-13 18:57 ` Steve Capper
2019-08-14 9:35 ` Catalin Marinas
2019-08-13 18:53 ` [PATCH 0/8] Fix issues with 52-bit kernel virtual addressing Steve Capper
2019-08-14 8:01 ` Geert Uytterhoeven
2019-08-14 11:29 ` Mark Rutland
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