From: Changbin Du <changbin.du@gmail.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Changbin Du <changbin.du@gmail.com>,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH] riscv: uaccess: fix __put_kernel_nofault()
Date: Mon, 2 Nov 2020 15:30:52 +0800 [thread overview]
Message-ID: <20201102073052.199638-1-changbin.du@gmail.com> (raw)
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
next reply other threads:[~2020-11-02 7:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 7:30 Changbin Du [this message]
2020-11-03 8:50 ` [PATCH] riscv: uaccess: fix __put_kernel_nofault() Christoph Hellwig
2020-11-06 6:51 ` Anup Patel
2020-11-06 7:45 ` Palmer Dabbelt
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