xnu-4903.221.2.tar.gz

[apple/xnu.git] / bsd / libkern / copyio.h

diff --git a/bsd/libkern/copyio.h b/bsd/libkern/copyio.h
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+++ b/bsd/libkern/copyio.h
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+/*
+ * Copyright (c) 2017 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+#ifndef _LIBKERN_COPYIO_H_
+#define _LIBKERN_COPYIO_H_
+
+#include <kern/debug.h>
+
+__BEGIN_DECLS
+
+int    copyin(const user_addr_t uaddr, void *kaddr, size_t len);
+int    copyout(const void *kaddr, user_addr_t udaddr, size_t len);
+
+#if defined (_FORTIFY_SOURCE) && _FORTIFY_SOURCE == 0
+/* FORTIFY_SOURCE disabled */
+#else
+__attribute__((always_inline)) static inline int
+__copyin_chk(const user_addr_t uaddr, void *kaddr, size_t len, size_t chk_size)
+{
+       if (chk_size < len) {
+               panic("__copyin_chk object size check failed: uaddr %p, kaddr %p, (%zu < %zu)", (void*)uaddr, kaddr, len, chk_size);
+       }
+       return copyin(uaddr, kaddr, len);
+}
+
+__attribute__((always_inline)) static inline int
+__copyout_chk(const void *kaddr, user_addr_t uaddr, size_t len, size_t chk_size)
+{
+       if  (chk_size < len) {
+               panic("__copyout_chk object size check failed: uaddr %p, kaddr %p, (%zu < %zu)", (void*)uaddr, kaddr, len, chk_size);
+       }
+       return copyout(kaddr, uaddr, len);
+}
+#define copyin(uaddr, kaddr, len) __copyin_chk(uaddr, kaddr, len, __builtin_object_size(kaddr, 0))
+#define copyout(kaddr, uaddr, len) __copyout_chk(kaddr, uaddr, len, __builtin_object_size(kaddr, 0))
+#endif
+__END_DECLS
+#endif /* _LIBKERN_COPYIO_H_ */