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authorJonas Bonn <jonas@southpole.se>2012-05-27 10:25:47 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-27 21:00:32 -0700
commitb48b2c3e50433ff6f7e46186daa7f986bd960215 (patch)
tree9a10b2130582f99df5ae7eae0b959425e791118c /arch/openrisc
parent1629372caaaf7ef744d3b983be56b99468a68ff8 (diff)
downloadlinux-linaro-stable-b48b2c3e50433ff6f7e46186daa7f986bd960215.tar.gz
openrisc: use generic strnlen_user() function
The generic version is both easier to support and more correct. Signed-off-by: Jonas Bonn <jonas@southpole.se> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/openrisc')
-rw-r--r--arch/openrisc/Kconfig1
-rw-r--r--arch/openrisc/include/asm/uaccess.h30
-rw-r--r--arch/openrisc/lib/string.S47
3 files changed, 3 insertions, 75 deletions
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 065623215c58..49765b53f637 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -20,6 +20,7 @@ config OPENRISC
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_STRNCPY_FROM_USER
+ select GENERIC_STRNLEN_USER
config MMU
def_bool y
diff --git a/arch/openrisc/include/asm/uaccess.h b/arch/openrisc/include/asm/uaccess.h
index 04b93de92636..ab2e7a198a4c 100644
--- a/arch/openrisc/include/asm/uaccess.h
+++ b/arch/openrisc/include/asm/uaccess.h
@@ -318,33 +318,7 @@ clear_user(void *addr, unsigned long size)
extern long strncpy_from_user(char *dest, const char __user *src, long count);
-/*
- * Return the size of a string (including the ending 0)
- *
- * Return 0 for error
- */
-
-extern int __strnlen_user(const char *str, long len, unsigned long top);
-
-/*
- * Returns the length of the string at str (including the null byte),
- * or 0 if we hit a page we can't access,
- * or something > len if we didn't find a null byte.
- *
- * The `top' parameter to __strnlen_user is to make sure that
- * we can never overflow from the user area into kernel space.
- */
-static inline long strnlen_user(const char __user *str, long len)
-{
- unsigned long top = (unsigned long)get_fs();
- unsigned long res = 0;
-
- if (__addr_ok(str))
- res = __strnlen_user(str, len, top);
-
- return res;
-}
-
-#define strlen_user(str) strnlen_user(str, TASK_SIZE-1)
+extern __must_check long strlen_user(const char __user *str);
+extern __must_check long strnlen_user(const char __user *str, long n);
#endif /* __ASM_OPENRISC_UACCESS_H */
diff --git a/arch/openrisc/lib/string.S b/arch/openrisc/lib/string.S
index 8ceb11ebafb9..c09fee7dec14 100644
--- a/arch/openrisc/lib/string.S
+++ b/arch/openrisc/lib/string.S
@@ -103,50 +103,3 @@ __clear_user:
.section __ex_table, "a"
.long 9b, 99b // write fault
.previous
-
-
-/*
- * extern int __strnlen_user(const char *str, long len, unsigned long top);
- *
- *
- * RTRN: - length of a string including NUL termination character
- * - on page fault 0
- */
-
- .global __strnlen_user
-__strnlen_user:
- l.addi r1,r1,-8
- l.sw 0(r1),r6
- l.sw 4(r1),r3
-
- l.addi r11,r0,0
-2: l.sfeq r11,r4
- l.bf 1f
- l.addi r11,r11,1
-8: l.lbz r6,0(r3)
- l.sfeq r6,r0
- l.bf 1f
- l.sfgeu r3,r5 // are we over the top ?
- l.bf 99f
- l.j 2b
- l.addi r3,r3,1
-
-1:
- l.lwz r6,0(r1)
- l.lwz r3,4(r1)
- l.jr r9
- l.addi r1,r1,8
-
- .section .fixup, "ax"
-99:
- l.addi r11,r0,0
-
- l.lwz r6,0(r1)
- l.lwz r3,4(r1)
- l.jr r9
- l.addi r1,r1,8
- .previous
-
- .section __ex_table, "a"
- .long 8b, 99b // read fault
- .previous