path: root/arch/sh/include
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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-03 18:57:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-03 18:57:57 -0800
commit96d4f267e40f9509e8a66e2b39e8b95655617693 (patch)
treedf03d142d405652392707b1b80c284d68d6ea6ab /arch/sh/include
parentMerge tag 'locks-v4.21-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux (diff)
Remove 'type' argument from access_ok() function
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/include')
3 files changed, 6 insertions, 7 deletions
diff --git a/arch/sh/include/asm/checksum_32.h b/arch/sh/include/asm/checksum_32.h
index b58f3d95dc19..36b84cfd3f67 100644
--- a/arch/sh/include/asm/checksum_32.h
+++ b/arch/sh/include/asm/checksum_32.h
@@ -197,7 +197,7 @@ static inline __wsum csum_and_copy_to_user(const void *src,
int len, __wsum sum,
int *err_ptr)
- if (access_ok(VERIFY_WRITE, dst, len))
+ if (access_ok(dst, len))
return csum_partial_copy_generic((__force const void *)src,
dst, len, sum, NULL, err_ptr);
diff --git a/arch/sh/include/asm/futex.h b/arch/sh/include/asm/futex.h
index 6d192f4908a7..3190ec89df81 100644
--- a/arch/sh/include/asm/futex.h
+++ b/arch/sh/include/asm/futex.h
@@ -22,7 +22,7 @@ static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+ if (!access_ok(uaddr, sizeof(u32)))
return -EFAULT;
return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
diff --git a/arch/sh/include/asm/uaccess.h b/arch/sh/include/asm/uaccess.h
index 32eb56e00c11..deebbfab5342 100644
--- a/arch/sh/include/asm/uaccess.h
+++ b/arch/sh/include/asm/uaccess.h
@@ -18,7 +18,7 @@
#define __access_ok(addr, size) \
(__addr_ok((addr) + (size)))
-#define access_ok(type, addr, size) \
+#define access_ok(addr, size) \
(__chk_user_ptr(addr), \
__access_ok((unsigned long __force)(addr), (size)))
@@ -66,7 +66,7 @@ struct __large_struct { unsigned long buf[100]; };
long __gu_err = -EFAULT; \
unsigned long __gu_val = 0; \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \
- if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
+ if (likely(access_ok(__gu_addr, (size)))) \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
__gu_err; \
@@ -87,7 +87,7 @@ struct __large_struct { unsigned long buf[100]; };
long __pu_err = -EFAULT; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
__typeof__(*(ptr)) __pu_val = x; \
- if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
+ if (likely(access_ok(__pu_addr, size))) \
__put_user_size(__pu_val, __pu_addr, (size), \
__pu_err); \
__pu_err; \
@@ -132,8 +132,7 @@ __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
void __user * __cl_addr = (addr); \
unsigned long __cl_size = (n); \
- if (__cl_size && access_ok(VERIFY_WRITE, \
- ((unsigned long)(__cl_addr)), __cl_size)) \
+ if (__cl_size && access_ok(__cl_addr, __cl_size)) \
__cl_size = __clear_user(__cl_addr, __cl_size); \
__cl_size; \