maccess: unify the probe kernel arch hooks

Currently architectures have to override every routine that probes
kernel memory, which includes a pure read and strcpy, both in strict
and not strict variants.  Just provide a single arch hooks instead to
make sure all architectures cover all the cases.

[[email protected]: fix !CONFIG_X86_64 build]

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 4 insertions, 8 deletions

diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c
index beceaab34ecb..5b75c35d1da0 100644
--- a/arch/parisc/lib/memcpy.c
+++ b/arch/parisc/lib/memcpy.c
@@ -57,14 +57,10 @@ void * memcpy(void * dst,const void *src, size_t count)
 EXPORT_SYMBOL(raw_copy_in_user);
 EXPORT_SYMBOL(memcpy);
 
-long probe_kernel_read(void *dst, const void *src, size_t size)
+bool probe_kernel_read_allowed(const void *unsafe_src, size_t size, bool strict)
 {
-	unsigned long addr = (unsigned long)src;
-
-	if (addr < PAGE_SIZE)
-		return -EFAULT;
-
+	if ((unsigned long)unsafe_src < PAGE_SIZE)
+		return false;
 	/* check for I/O space F_EXTEND(0xfff00000) access as well? */
-
-	return __probe_kernel_read(dst, src, size);
+	return true;
 }