On Fri, Dec 14, 2018 at 07:33:20AM -0500, Michael S. Tsirkin wrote:
> > - unsafe_put_user/unsafe_get_user is not sufficient for accessing structures
> > (e.g accessing descriptor) or arrays (batching).
>
> So you want unsafe_copy_xxx_user? I can do this. Hang on will post.
Like this basically? Warning: completely untested.
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index b5e58cc0c5e7..d2afd70793ca 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -728,5 +728,10 @@ do {
\
if (unlikely(__gu_err)) goto err_label;
\
} while (0)
+#define unsafe_copy_from_user(to, from, n)
\
+ __copy_user_ll(to, (__force const void *)from, n)
+#define unsafe_copy_to_user(to, from, n)
\
+ __copy_user_ll((__force void *)to, from, n)
+
#endif /* _ASM_X86_UACCESS_H */
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index efe79c1cdd47..b9d515ba2920 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -271,6 +271,8 @@ extern long strncpy_from_unsafe(char *dst, const void
*unsafe_addr, long count);
#define user_access_end() do { } while (0)
#define unsafe_get_user(x, ptr, err) do { if (unlikely(__get_user(x, ptr)))
goto err; } while (0)
#define unsafe_put_user(x, ptr, err) do { if (unlikely(__put_user(x, ptr)))
goto err; } while (0)
+#define unsafe_copy_to_user(from, to, n) copy_to_user(from, to, n)
+#define unsafe_copy_from_user(from, to, n) copy_from_user(from, to, n)
#endif
#ifdef CONFIG_HARDENED_USERCOPY
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