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Date: Wed, 16 Feb 2022 14:13:17 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
linux-mm@...ck.org, linux-api@...r.kernel.org, arnd@...db.de,
linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Cc: linux@...linux.org.uk, will@...nel.org, guoren@...nel.org,
bcain@...eaurora.org, geert@...ux-m68k.org, monstr@...str.eu,
tsbogend@...ha.franken.de, nickhu@...estech.com,
green.hu@...il.com, dinguyen@...nel.org, shorne@...il.com,
deller@....de, mpe@...erman.id.au, peterz@...radead.org,
mingo@...hat.com, mark.rutland@....com, hca@...ux.ibm.com,
dalias@...c.org, davem@...emloft.net, richard@....at,
x86@...nel.org, jcmvbkbc@...il.com, ebiederm@...ssion.com,
akpm@...ux-foundation.org, ardb@...nel.org,
linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
linux-mips@...r.kernel.org, openrisc@...ts.librecores.org,
linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
stable@...r.kernel.org
Subject: [PATCH v2 03/18] nds32: fix access_ok() checks in get/put_user
From: Arnd Bergmann <arnd@...db.de>
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@...r.kernel.org @ v4.19+
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
arch/nds32/include/asm/uaccess.h | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/arch/nds32/include/asm/uaccess.h b/arch/nds32/include/asm/uaccess.h
index d4cbf069dc22..37a40981deb3 100644
--- a/arch/nds32/include/asm/uaccess.h
+++ b/arch/nds32/include/asm/uaccess.h
@@ -70,9 +70,7 @@ 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); \
@@ -85,6 +83,14 @@ 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); \
@@ -165,12 +171,18 @@ 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; \
})
--
2.29.2
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