diff options
author | Arnd Bergmann <arnd@arndb.de> | 2022-02-14 15:48:14 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-28 08:46:48 +0200 |
commit | bb4878b39d6d35e4416696c7245083b5b7f812d2 (patch) | |
tree | 68c424d8d867d3b051ffd06d943c9d89df56149d | |
parent | 5b1d2561a03e534064b51c50c774657833d3d2cf (diff) |
nds32: fix access_ok() checks in get/put_user
commit 8926d88ced46700bf6117ceaf391480b943ea9f4 upstream.
The get_user()/put_user() functions are meant to check for
access_ok(), while the __get_user()/__put_user() functions
don't.
This broke in 4.19 for nds32, when it gained an extraneous
check in __get_user(), but lost the check it needs in
__put_user().
Fixes: 487913ab18c2 ("nds32: Extract the checking and getting pointer to a macro")
Cc: stable@vger.kernel.org @ v4.19+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | arch/nds32/include/asm/uaccess.h | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/arch/nds32/include/asm/uaccess.h b/arch/nds32/include/asm/uaccess.h index 8916ad9f9f13..e205b1db8c80 100644 --- a/arch/nds32/include/asm/uaccess.h +++ b/arch/nds32/include/asm/uaccess.h @@ -71,9 +71,7 @@ static inline void set_fs(mm_segment_t fs) * versions are void (ie, don't return a value as such). */ -#define get_user __get_user \ - -#define __get_user(x, ptr) \ +#define get_user(x, ptr) \ ({ \ long __gu_err = 0; \ __get_user_check((x), (ptr), __gu_err); \ @@ -86,6 +84,14 @@ static inline void set_fs(mm_segment_t fs) (void)0; \ }) +#define __get_user(x, ptr) \ +({ \ + long __gu_err = 0; \ + const __typeof__(*(ptr)) __user *__p = (ptr); \ + __get_user_err((x), __p, (__gu_err)); \ + __gu_err; \ +}) + #define __get_user_check(x, ptr, err) \ ({ \ const __typeof__(*(ptr)) __user *__p = (ptr); \ @@ -166,12 +172,18 @@ do { \ : "r"(addr), "i"(-EFAULT) \ : "cc") -#define put_user __put_user \ +#define put_user(x, ptr) \ +({ \ + long __pu_err = 0; \ + __put_user_check((x), (ptr), __pu_err); \ + __pu_err; \ +}) #define __put_user(x, ptr) \ ({ \ long __pu_err = 0; \ - __put_user_err((x), (ptr), __pu_err); \ + __typeof__(*(ptr)) __user *__p = (ptr); \ + __put_user_err((x), __p, __pu_err); \ __pu_err; \ }) |