Use the same approach as unsafe_copy_to_user() but instead call
unsafe_get_user() in a loop.
Signed-off-by: Christopher M. Riedl <c...@codefail.de>
---
v7: * Change implementation to call unsafe_get_user() and remove
dja's 'Reviewed-by' tag
---
arch/powerpc/include/asm/uaccess.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/arch/powerpc/include/asm/uaccess.h
b/arch/powerpc/include/asm/uaccess.h
index 78e2a3990eab..ef5978b73a8d 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -487,6 +487,27 @@ user_write_access_begin(const void __user *ptr, size_t len)
#define unsafe_put_user(x, p, e) \
__unsafe_put_user_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)
+#define unsafe_copy_from_user(d, s, l, e) \
+do {
\
+ u8 *_dst = (u8 *)(d);
\
+ const u8 __user *_src = (const u8 __user *)(s);
\
+ size_t _len = (l);
\
+ int _i;
\
+
\
+ for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long))
\
+ unsafe_get_user(*(long *)(_dst + _i), (long __user *)(_src +
_i), e); \
+ if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) {
\
+ unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i),
e); \
+ _i += 4;
\
+ }
\
+ if (_len & 2) {
\
+ unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i),
e); \
+ _i += 2;
\
+ }
\
+ if (_len & 1)
\
+ unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i),
e); \
+} while (0)
+
#define unsafe_copy_to_user(d, s, l, e) \
do { \
u8 __user *_dst = (u8 __user *)(d); \
--
2.26.1
