Merge branch 'work.uaccess' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull uaccess unification updates from Al Viro:
 "This is the uaccess unification pile. It's _not_ the end of uaccess
  work, but the next batch of that will go into the next cycle. This one
  mostly takes copy_from_user() and friends out of arch/* and gets the
  zero-padding behaviour in sync for all architectures.

  Dealing with the nocache/writethrough mess is for the next cycle;
  fortunately, that's x86-only. Same for cleanups in iov_iter.c (I am
  sold on access_ok() in there, BTW; just not in this pile), same for
  reducing __copy_... callsites, strn*... stuff, etc. - there will be a
  pile about as large as this one in the next merge window.

  This one sat in -next for weeks. -3KLoC"

* 'work.uaccess' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (96 commits)
  HAVE_ARCH_HARDENED_USERCOPY is unconditional now
  CONFIG_ARCH_HAS_RAW_COPY_USER is unconditional now
  m32r: switch to RAW_COPY_USER
  hexagon: switch to RAW_COPY_USER
  microblaze: switch to RAW_COPY_USER
  get rid of padding, switch to RAW_COPY_USER
  ia64: get rid of copy_in_user()
  ia64: sanitize __access_ok()
  ia64: get rid of 'segment' argument of __do_{get,put}_user()
  ia64: get rid of 'segment' argument of __{get,put}_user_check()
  ia64: add extable.h
  powerpc: get rid of zeroing, switch to RAW_COPY_USER
  esas2r: don't open-code memdup_user()
  alpha: fix stack smashing in old_adjtimex(2)
  don't open-code kernel_setsockopt()
  mips: switch to RAW_COPY_USER
  mips: get rid of tail-zeroing in primitives
  mips: make copy_from_user() zero tail explicitly
  mips: clean and reorder the forest of macros...
  mips: consolidate __invoke_... wrappers
  ...

2 files changed, 9 insertions, 62 deletions

diff --git a/arch/parisc/include/asm/futex.h b/arch/parisc/include/asm/futex.h
index ac8bd586ace8..0ba14300cd8e 100644
--- a/arch/parisc/include/asm/futex.h
+++ b/arch/parisc/include/asm/futex.h
@@ -109,7 +109,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 	/* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
 	 * our gateway page, and causes no end of trouble...
 	 */
-	if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
+	if (uaccess_kernel() && !uaddr)
 		return -EFAULT;
 
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
index cbd4f4af8108..6b113f39f30c 100644
--- a/arch/parisc/include/asm/uaccess.h
+++ b/arch/parisc/include/asm/uaccess.h
@@ -6,15 +6,10 @@
  */
 #include <asm/page.h>
 #include <asm/cache.h>
-#include <asm/errno.h>
 #include <asm-generic/uaccess-unaligned.h>
 
 #include <linux/bug.h>
 #include <linux/string.h>
-#include <linux/thread_info.h>
-
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
 
 #define KERNEL_DS	((mm_segment_t){0})
 #define USER_DS 	((mm_segment_t){1})
@@ -216,9 +211,6 @@ struct exception_data {
  * Complex access routines -- external declarations
  */
 
-extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
-extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
-extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
 extern long strncpy_from_user(char *, const char __user *, long);
 extern unsigned lclear_user(void __user *, unsigned long);
 extern long lstrnlen_user(const char __user *, long);
@@ -232,59 +224,14 @@ extern long lstrnlen_user(const char __user *, long);
 #define clear_user lclear_user
 #define __clear_user lclear_user
 
-unsigned long __must_check __copy_to_user(void __user *dst, const void *src,
-					  unsigned long len);
-unsigned long __must_check __copy_from_user(void *dst, const void __user *src,
-					  unsigned long len);
-unsigned long copy_in_user(void __user *dst, const void __user *src,
-			   unsigned long len);
-#define __copy_in_user copy_in_user
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
-
-extern void __compiletime_error("usercopy buffer size is too small")
-__bad_copy_user(void);
-
-static inline void copy_user_overflow(int size, unsigned long count)
-{
-	WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
-}
-
-static __always_inline unsigned long __must_check
-copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-	int sz = __compiletime_object_size(to);
-	unsigned long ret = n;
-
-	if (likely(sz < 0 || sz >= n)) {
-		check_object_size(to, n, false);
-		ret = __copy_from_user(to, from, n);
-	} else if (!__builtin_constant_p(n))
-		copy_user_overflow(sz, n);
-	else
-		__bad_copy_user();
-
-	if (unlikely(ret))
-		memset(to + (n - ret), 0, ret);
-
-	return ret;
-}
-
-static __always_inline unsigned long __must_check
-copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-	int sz = __compiletime_object_size(from);
-
-	if (likely(sz < 0 || sz >= n)) {
-		check_object_size(from, n, true);
-		n = __copy_to_user(to, from, n);
-	} else if (!__builtin_constant_p(n))
-		copy_user_overflow(sz, n);
-	else
-		__bad_copy_user();
-
-	return n;
-}
+unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src,
+					    unsigned long len);
+unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src,
+					    unsigned long len);
+unsigned long __must_check raw_copy_in_user(void __user *dst, const void __user *src,
+					    unsigned long len);
+#define INLINE_COPY_TO_USER
+#define INLINE_COPY_FROM_USER
 
 struct pt_regs;
 int fixup_exception(struct pt_regs *regs);