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* [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
@ 2021-01-29 17:31 ` Alexandre Ghiti
  0 siblings, 0 replies; 7+ messages in thread
From: Alexandre Ghiti @ 2021-01-29 17:31 UTC (permalink / raw)
  To: Paul Walmsley, Palmer Dabbelt, Albert Ou, dvyukov, linux-riscv,
	linux-kernel
  Cc: Alexandre Ghiti

virt_addr_valid macro checks that a virtual address is valid, ie that
the address belongs to the linear mapping and that the corresponding
 physical page exists.

Add the missing check that ensures the virtual address belongs to the
linear mapping, otherwise __virt_to_phys, when compiled with
CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
kernel bug by syzbot.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
---
 arch/riscv/include/asm/page.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index 2d50f76efe48..64a675c5c30a 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
 
 #endif /* __ASSEMBLY__ */
 
-#define virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
+#define virt_addr_valid(vaddr)	({						\
+	unsigned long _addr = (unsigned long)vaddr;				\
+	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
+})
 
 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
 
-- 
2.20.1


^ permalink raw reply related	[flat|nested] 7+ messages in thread
* [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
@ 2021-01-29 17:31 ` Alexandre Ghiti
  0 siblings, 0 replies; 7+ messages in thread
From: Alexandre Ghiti @ 2021-01-29 17:31 UTC (permalink / raw)
  To: Paul Walmsley, Palmer Dabbelt, Albert Ou, dvyukov, linux-riscv,
	linux-kernel
  Cc: Alexandre Ghiti

virt_addr_valid macro checks that a virtual address is valid, ie that
the address belongs to the linear mapping and that the corresponding
 physical page exists.

Add the missing check that ensures the virtual address belongs to the
linear mapping, otherwise __virt_to_phys, when compiled with
CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
kernel bug by syzbot.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
---
 arch/riscv/include/asm/page.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index 2d50f76efe48..64a675c5c30a 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
 
 #endif /* __ASSEMBLY__ */
 
-#define virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
+#define virt_addr_valid(vaddr)	({						\
+	unsigned long _addr = (unsigned long)vaddr;				\
+	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
+})
 
 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
 
-- 
2.20.1


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply related	[flat|nested] 7+ messages in thread
* Re: [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
  2021-01-29 17:31 ` Alexandre Ghiti
@ 2021-01-29 19:04   ` Atish Patra
  -1 siblings, 0 replies; 7+ messages in thread
From: Atish Patra @ 2021-01-29 19:04 UTC (permalink / raw)
  To: Alexandre Ghiti
  Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, dvyukov, linux-riscv,
	linux-kernel@vger.kernel.org List

On Fri, Jan 29, 2021 at 9:31 AM Alexandre Ghiti <alex@ghiti.fr> wrote:
>
> virt_addr_valid macro checks that a virtual address is valid, ie that
> the address belongs to the linear mapping and that the corresponding
>  physical page exists.
>
> Add the missing check that ensures the virtual address belongs to the
> linear mapping, otherwise __virt_to_phys, when compiled with
> CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
> kernel bug by syzbot.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/riscv/include/asm/page.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index 2d50f76efe48..64a675c5c30a 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
>
>  #endif /* __ASSEMBLY__ */
>
> -#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
> +#define virt_addr_valid(vaddr) ({                                              \
> +       unsigned long _addr = (unsigned long)vaddr;                             \
> +       (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
> +})
>
>  #define VM_DATA_DEFAULT_FLAGS  VM_DATA_FLAGS_NON_EXEC
>
> --
> 2.20.1
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv


Reviewed-by: Atish Patra <atish.patra@wdc.com>

-- 
Regards,
Atish

^ permalink raw reply	[flat|nested] 7+ messages in thread
* Re: [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
@ 2021-01-29 19:04   ` Atish Patra
  0 siblings, 0 replies; 7+ messages in thread
From: Atish Patra @ 2021-01-29 19:04 UTC (permalink / raw)
  To: Alexandre Ghiti
  Cc: Albert Ou, linux-kernel@vger.kernel.org List, Palmer Dabbelt,
	Paul Walmsley, linux-riscv, dvyukov

On Fri, Jan 29, 2021 at 9:31 AM Alexandre Ghiti <alex@ghiti.fr> wrote:
>
> virt_addr_valid macro checks that a virtual address is valid, ie that
> the address belongs to the linear mapping and that the corresponding
>  physical page exists.
>
> Add the missing check that ensures the virtual address belongs to the
> linear mapping, otherwise __virt_to_phys, when compiled with
> CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
> kernel bug by syzbot.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/riscv/include/asm/page.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index 2d50f76efe48..64a675c5c30a 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
>
>  #endif /* __ASSEMBLY__ */
>
> -#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
> +#define virt_addr_valid(vaddr) ({                                              \
> +       unsigned long _addr = (unsigned long)vaddr;                             \
> +       (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
> +})
>
>  #define VM_DATA_DEFAULT_FLAGS  VM_DATA_FLAGS_NON_EXEC
>
> --
> 2.20.1
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv


Reviewed-by: Atish Patra <atish.patra@wdc.com>

-- 
Regards,
Atish

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 7+ messages in thread
* Re: [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
  2021-01-29 17:31 ` Alexandre Ghiti
  (?)
  (?)
@ 2021-01-31 10:00 ` Dmitry Vyukov
  -1 siblings, 0 replies; 7+ messages in thread
From: Dmitry Vyukov @ 2021-01-31 10:00 UTC (permalink / raw)
  To: Alexandre Ghiti
  Cc: linux-riscv, Albert Ou, Palmer Dabbelt, LKML, Paul Walmsley

On Fri, Jan 29, 2021 at 6:31 PM Alexandre Ghiti <alex@ghiti.fr> wrote:
>
> virt_addr_valid macro checks that a virtual address is valid, ie that
> the address belongs to the linear mapping and that the corresponding
>  physical page exists.
>
> Add the missing check that ensures the virtual address belongs to the
> linear mapping, otherwise __virt_to_phys, when compiled with
> CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
> kernel bug by syzbot.

Thanks, Alexandre. Much appreciated.

> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/riscv/include/asm/page.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index 2d50f76efe48..64a675c5c30a 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
>
>  #endif /* __ASSEMBLY__ */
>
> -#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
> +#define virt_addr_valid(vaddr) ({                                              \
> +       unsigned long _addr = (unsigned long)vaddr;                             \
> +       (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
> +})
>
>  #define VM_DATA_DEFAULT_FLAGS  VM_DATA_FLAGS_NON_EXEC
>
> --
> 2.20.1
>

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 7+ messages in thread
* Re: [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
  2021-01-29 17:31 ` Alexandre Ghiti
@ 2021-02-03  2:34   ` Palmer Dabbelt
  -1 siblings, 0 replies; 7+ messages in thread
From: Palmer Dabbelt @ 2021-02-03  2:34 UTC (permalink / raw)
  To: alex; +Cc: Paul Walmsley, aou, dvyukov, linux-riscv, linux-kernel, alex

On Fri, 29 Jan 2021 09:31:05 PST (-0800), alex@ghiti.fr wrote:
> virt_addr_valid macro checks that a virtual address is valid, ie that
> the address belongs to the linear mapping and that the corresponding
>  physical page exists.
>
> Add the missing check that ensures the virtual address belongs to the
> linear mapping, otherwise __virt_to_phys, when compiled with
> CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
> kernel bug by syzbot.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/riscv/include/asm/page.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index 2d50f76efe48..64a675c5c30a 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
>
>  #endif /* __ASSEMBLY__ */
>
> -#define virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
> +#define virt_addr_valid(vaddr)	({						\
> +	unsigned long _addr = (unsigned long)vaddr;				\
> +	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
> +})
>
>  #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC

Thanks, this is on fixes.

^ permalink raw reply	[flat|nested] 7+ messages in thread
* Re: [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping
@ 2021-02-03  2:34   ` Palmer Dabbelt
  0 siblings, 0 replies; 7+ messages in thread
From: Palmer Dabbelt @ 2021-02-03  2:34 UTC (permalink / raw)
  To: alex; +Cc: aou, alex, linux-kernel, Paul Walmsley, linux-riscv, dvyukov

On Fri, 29 Jan 2021 09:31:05 PST (-0800), alex@ghiti.fr wrote:
> virt_addr_valid macro checks that a virtual address is valid, ie that
> the address belongs to the linear mapping and that the corresponding
>  physical page exists.
>
> Add the missing check that ensures the virtual address belongs to the
> linear mapping, otherwise __virt_to_phys, when compiled with
> CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
> kernel bug by syzbot.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/riscv/include/asm/page.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index 2d50f76efe48..64a675c5c30a 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -135,7 +135,10 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
>
>  #endif /* __ASSEMBLY__ */
>
> -#define virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
> +#define virt_addr_valid(vaddr)	({						\
> +	unsigned long _addr = (unsigned long)vaddr;				\
> +	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
> +})
>
>  #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC

Thanks, this is on fixes.

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-02-03  2:35 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-29 17:31 [PATCH] riscv: virt_addr_valid must check the address belongs to linear mapping Alexandre Ghiti
2021-01-29 17:31 ` Alexandre Ghiti
2021-01-29 19:04 ` Atish Patra
2021-01-29 19:04   ` Atish Patra
2021-01-31 10:00 ` Dmitry Vyukov
2021-02-03  2:34 ` Palmer Dabbelt
2021-02-03  2:34   ` Palmer Dabbelt

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