* [PATCH] riscv: uaccess: fix __put_kernel_nofault()
@ 2020-11-02 7:30 Changbin Du
2020-11-03 8:50 ` Christoph Hellwig
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Changbin Du @ 2020-11-02 7:30 UTC (permalink / raw)
To: Paul Walmsley, Palmer Dabbelt, Albert Ou, Andrew Morton
Cc: linux-riscv, linux-kernel, Changbin Du, Christoph Hellwig
The copy_from_kernel_nofault() is broken on riscv because the 'dst' and
'src' are mistakenly reversed in __put_kernel_nofault() macro.
copy_to_kernel_nofault:
...
0xffffffe0003159b8 <+30>: sd a4,0(a1) # a1 aka 'src'
Fixes: d464118cdc ("riscv: implement __get_kernel_nofault and __put_user_nofault")
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
---
arch/riscv/include/asm/uaccess.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index c47e6b35c551..824b2c9da75b 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -476,7 +476,7 @@ do { \
do { \
long __kr_err; \
\
- __put_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \
+ __put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \
if (unlikely(__kr_err)) \
goto err_label; \
} while (0)
--
2.17.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] riscv: uaccess: fix __put_kernel_nofault()
2020-11-02 7:30 [PATCH] riscv: uaccess: fix __put_kernel_nofault() Changbin Du
@ 2020-11-03 8:50 ` Christoph Hellwig
2020-11-06 6:51 ` Anup Patel
2020-11-06 7:45 ` Palmer Dabbelt
2 siblings, 0 replies; 4+ messages in thread
From: Christoph Hellwig @ 2020-11-03 8:50 UTC (permalink / raw)
To: Changbin Du
Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Andrew Morton,
linux-riscv, linux-kernel, Christoph Hellwig
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] riscv: uaccess: fix __put_kernel_nofault()
2020-11-02 7:30 [PATCH] riscv: uaccess: fix __put_kernel_nofault() Changbin Du
2020-11-03 8:50 ` Christoph Hellwig
@ 2020-11-06 6:51 ` Anup Patel
2020-11-06 7:45 ` Palmer Dabbelt
2 siblings, 0 replies; 4+ messages in thread
From: Anup Patel @ 2020-11-06 6:51 UTC (permalink / raw)
To: Changbin Du, Palmer Dabbelt, Palmer Dabbelt
Cc: Paul Walmsley, Albert Ou, Andrew Morton, linux-riscv,
linux-kernel@vger.kernel.org List, Christoph Hellwig
On Mon, Nov 2, 2020 at 1:01 PM Changbin Du <changbin.du@gmail.com> wrote:
>
> The copy_from_kernel_nofault() is broken on riscv because the 'dst' and
> 'src' are mistakenly reversed in __put_kernel_nofault() macro.
>
> copy_to_kernel_nofault:
> ...
> 0xffffffe0003159b8 <+30>: sd a4,0(a1) # a1 aka 'src'
>
> Fixes: d464118cdc ("riscv: implement __get_kernel_nofault and __put_user_nofault")
> Signed-off-by: Changbin Du <changbin.du@gmail.com>
> Cc: Christoph Hellwig <hch@lst.de>
> ---
> arch/riscv/include/asm/uaccess.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
> index c47e6b35c551..824b2c9da75b 100644
> --- a/arch/riscv/include/asm/uaccess.h
> +++ b/arch/riscv/include/asm/uaccess.h
> @@ -476,7 +476,7 @@ do { \
> do { \
> long __kr_err; \
> \
> - __put_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \
> + __put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \
> if (unlikely(__kr_err)) \
> goto err_label; \
> } while (0)
> --
> 2.17.1
>
>
Looks good to me.
Tested-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
@Palmer Dabbelt , This patch fixes jump label implementation in
Linux-5.10-rc2. In general, this patch fixes all kernel instruction
patching related features. Can you take this for Linux-5.10-rcX ??
Regards,
Anup
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] riscv: uaccess: fix __put_kernel_nofault()
2020-11-02 7:30 [PATCH] riscv: uaccess: fix __put_kernel_nofault() Changbin Du
2020-11-03 8:50 ` Christoph Hellwig
2020-11-06 6:51 ` Anup Patel
@ 2020-11-06 7:45 ` Palmer Dabbelt
2 siblings, 0 replies; 4+ messages in thread
From: Palmer Dabbelt @ 2020-11-06 7:45 UTC (permalink / raw)
To: changbin.du
Cc: Paul Walmsley, aou, akpm, linux-riscv, linux-kernel, changbin.du,
Christoph Hellwig
On Sun, 01 Nov 2020 23:30:52 PST (-0800), changbin.du@gmail.com wrote:
> The copy_from_kernel_nofault() is broken on riscv because the 'dst' and
> 'src' are mistakenly reversed in __put_kernel_nofault() macro.
>
> copy_to_kernel_nofault:
> ...
> 0xffffffe0003159b8 <+30>: sd a4,0(a1) # a1 aka 'src'
>
> Fixes: d464118cdc ("riscv: implement __get_kernel_nofault and __put_user_nofault")
> Signed-off-by: Changbin Du <changbin.du@gmail.com>
> Cc: Christoph Hellwig <hch@lst.de>
> ---
> arch/riscv/include/asm/uaccess.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
> index c47e6b35c551..824b2c9da75b 100644
> --- a/arch/riscv/include/asm/uaccess.h
> +++ b/arch/riscv/include/asm/uaccess.h
> @@ -476,7 +476,7 @@ do { \
> do { \
> long __kr_err; \
> \
> - __put_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \
> + __put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \
> if (unlikely(__kr_err)) \
> goto err_label; \
> } while (0)
Thanks, this is on fixes.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-11-02 7:30 [PATCH] riscv: uaccess: fix __put_kernel_nofault() Changbin Du
2020-11-03 8:50 ` Christoph Hellwig
2020-11-06 6:51 ` Anup Patel
2020-11-06 7:45 ` Palmer Dabbelt
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