Merge branch 'linus' into x86/urgent

Required to queue a dependent fix.

61 files changed, 3127 insertions, 1140 deletions

diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
index a04adbc70ddf..d00221345c19 100644
--- a/include/uapi/linux/aio_abi.h
+++ b/include/uapi/linux/aio_abi.h
@@ -29,6 +29,7 @@
 
 #include <linux/types.h>
 #include <linux/fs.h>
+#include <linux/signal.h>
 #include <asm/byteorder.h>
 
 typedef __kernel_ulong_t aio_context_t;
@@ -38,10 +39,8 @@ enum {
 	IOCB_CMD_PWRITE = 1,
 	IOCB_CMD_FSYNC = 2,
 	IOCB_CMD_FDSYNC = 3,
-	/* These two are experimental.
-	 * IOCB_CMD_PREADX = 4,
-	 * IOCB_CMD_POLL = 5,
-	 */
+	/* 4 was the experimental IOCB_CMD_PREADX */
+	IOCB_CMD_POLL = 5,
 	IOCB_CMD_NOOP = 6,
 	IOCB_CMD_PREADV = 7,
 	IOCB_CMD_PWRITEV = 8,
@@ -54,6 +53,7 @@ enum {
  *                   is valid.
  */
 #define IOCB_FLAG_RESFD		(1 << 0)
+#define IOCB_FLAG_IOPRIO	(1 << 1)
 
 /* read() from /dev/aio returns these structures. */
 struct io_event {
@@ -108,5 +108,10 @@ struct iocb {
 #undef IFBIG
 #undef IFLITTLE
 
+struct __aio_sigset {
+	const sigset_t __user	*sigmask;
+	size_t		sigsetsize;
+};
+
 #endif /* __LINUX__AIO_ABI_H */
 
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 4e61a9e05132..c35aee9ad4a6 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -147,6 +147,7 @@
 #define AUDIT_INTEGRITY_HASH	    1803 /* Integrity HASH type */
 #define AUDIT_INTEGRITY_PCR	    1804 /* PCR invalidation msgs */
 #define AUDIT_INTEGRITY_RULE	    1805 /* policy rule */
+#define AUDIT_INTEGRITY_EVM_XATTR   1806 /* New EVM-covered xattr */
 
 #define AUDIT_KERNEL		2000	/* Asynchronous audit record. NOT A REQUEST. */
 
@@ -465,6 +466,7 @@ struct audit_tty_status {
 };
 
 #define AUDIT_UID_UNSET (unsigned int)-1
+#define AUDIT_SID_UNSET ((unsigned int)-1)
 
 /* audit_rule_data supports filter rules with both integer and string
  * fields.  It corresponds with AUDIT_ADD_RULE, AUDIT_DEL_RULE and
diff --git a/include/uapi/linux/auto_fs.h b/include/uapi/linux/auto_fs.h
index 2a4432c7a4b4..e13eec3dfb2f 100644
--- a/include/uapi/linux/auto_fs.h
+++ b/include/uapi/linux/auto_fs.h
@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
 /*
- *   Copyright 1997 Transmeta Corporation - All Rights Reserved
+ * Copyright 1997 Transmeta Corporation - All Rights Reserved
+ * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
+ * Copyright 2005-2006,2013,2017-2018 Ian Kent <raven@themaw.net>
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
@@ -8,7 +10,6 @@
  *
  * ----------------------------------------------------------------------- */
 
-
 #ifndef _UAPI_LINUX_AUTO_FS_H
 #define _UAPI_LINUX_AUTO_FS_H
 
@@ -18,13 +19,11 @@
 #include <sys/ioctl.h>
 #endif /* __KERNEL__ */
 
+#define AUTOFS_PROTO_VERSION		5
+#define AUTOFS_MIN_PROTO_VERSION	3
+#define AUTOFS_MAX_PROTO_VERSION	5
 
-/* This file describes autofs v3 */
-#define AUTOFS_PROTO_VERSION	3
-
-/* Range of protocol versions defined */
-#define AUTOFS_MAX_PROTO_VERSION	AUTOFS_PROTO_VERSION
-#define AUTOFS_MIN_PROTO_VERSION	AUTOFS_PROTO_VERSION
+#define AUTOFS_PROTO_SUBVERSION		2
 
 /*
  * The wait_queue_token (autofs_wqt_t) is part of a structure which is passed
@@ -76,9 +75,155 @@ enum {
 #define AUTOFS_IOC_READY        _IO(AUTOFS_IOCTL, AUTOFS_IOC_READY_CMD)
 #define AUTOFS_IOC_FAIL         _IO(AUTOFS_IOCTL, AUTOFS_IOC_FAIL_CMD)
 #define AUTOFS_IOC_CATATONIC    _IO(AUTOFS_IOCTL, AUTOFS_IOC_CATATONIC_CMD)
-#define AUTOFS_IOC_PROTOVER     _IOR(AUTOFS_IOCTL, AUTOFS_IOC_PROTOVER_CMD, int)
-#define AUTOFS_IOC_SETTIMEOUT32 _IOWR(AUTOFS_IOCTL, AUTOFS_IOC_SETTIMEOUT_CMD, compat_ulong_t)
-#define AUTOFS_IOC_SETTIMEOUT   _IOWR(AUTOFS_IOCTL, AUTOFS_IOC_SETTIMEOUT_CMD, unsigned long)
-#define AUTOFS_IOC_EXPIRE       _IOR(AUTOFS_IOCTL, AUTOFS_IOC_EXPIRE_CMD, struct autofs_packet_expire)
+#define AUTOFS_IOC_PROTOVER     _IOR(AUTOFS_IOCTL, \
+				     AUTOFS_IOC_PROTOVER_CMD, int)
+#define AUTOFS_IOC_SETTIMEOUT32 _IOWR(AUTOFS_IOCTL, \
+				      AUTOFS_IOC_SETTIMEOUT_CMD, \
+				      compat_ulong_t)
+#define AUTOFS_IOC_SETTIMEOUT   _IOWR(AUTOFS_IOCTL, \
+				      AUTOFS_IOC_SETTIMEOUT_CMD, \
+				      unsigned long)
+#define AUTOFS_IOC_EXPIRE       _IOR(AUTOFS_IOCTL, \
+				     AUTOFS_IOC_EXPIRE_CMD, \
+				     struct autofs_packet_expire)
+
+/* autofs version 4 and later definitions */
+
+/* Mask for expire behaviour */
+#define AUTOFS_EXP_IMMEDIATE		1
+#define AUTOFS_EXP_LEAVES		2
+
+#define AUTOFS_TYPE_ANY			0U
+#define AUTOFS_TYPE_INDIRECT		1U
+#define AUTOFS_TYPE_DIRECT		2U
+#define AUTOFS_TYPE_OFFSET		4U
+
+static inline void set_autofs_type_indirect(unsigned int *type)
+{
+	*type = AUTOFS_TYPE_INDIRECT;
+}
+
+static inline unsigned int autofs_type_indirect(unsigned int type)
+{
+	return (type == AUTOFS_TYPE_INDIRECT);
+}
+
+static inline void set_autofs_type_direct(unsigned int *type)
+{
+	*type = AUTOFS_TYPE_DIRECT;
+}
+
+static inline unsigned int autofs_type_direct(unsigned int type)
+{
+	return (type == AUTOFS_TYPE_DIRECT);
+}
+
+static inline void set_autofs_type_offset(unsigned int *type)
+{
+	*type = AUTOFS_TYPE_OFFSET;
+}
+
+static inline unsigned int autofs_type_offset(unsigned int type)
+{
+	return (type == AUTOFS_TYPE_OFFSET);
+}
+
+static inline unsigned int autofs_type_trigger(unsigned int type)
+{
+	return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET);
+}
+
+/*
+ * This isn't really a type as we use it to say "no type set" to
+ * indicate we want to search for "any" mount in the
+ * autofs_dev_ioctl_ismountpoint() device ioctl function.
+ */
+static inline void set_autofs_type_any(unsigned int *type)
+{
+	*type = AUTOFS_TYPE_ANY;
+}
+
+static inline unsigned int autofs_type_any(unsigned int type)
+{
+	return (type == AUTOFS_TYPE_ANY);
+}
+
+/* Daemon notification packet types */
+enum autofs_notify {
+	NFY_NONE,
+	NFY_MOUNT,
+	NFY_EXPIRE
+};
+
+/* Kernel protocol version 4 packet types */
+
+/* Expire entry (umount request) */
+#define autofs_ptype_expire_multi	2
+
+/* Kernel protocol version 5 packet types */
+
+/* Indirect mount missing and expire requests. */
+#define autofs_ptype_missing_indirect	3
+#define autofs_ptype_expire_indirect	4
+
+/* Direct mount missing and expire requests */
+#define autofs_ptype_missing_direct	5
+#define autofs_ptype_expire_direct	6
+
+/* v4 multi expire (via pipe) */
+struct autofs_packet_expire_multi {
+	struct autofs_packet_hdr hdr;
+	autofs_wqt_t wait_queue_token;
+	int len;
+	char name[NAME_MAX+1];
+};
+
+union autofs_packet_union {
+	struct autofs_packet_hdr hdr;
+	struct autofs_packet_missing missing;
+	struct autofs_packet_expire expire;
+	struct autofs_packet_expire_multi expire_multi;
+};
+
+/* autofs v5 common packet struct */
+struct autofs_v5_packet {
+	struct autofs_packet_hdr hdr;
+	autofs_wqt_t wait_queue_token;
+	__u32 dev;
+	__u64 ino;
+	__u32 uid;
+	__u32 gid;
+	__u32 pid;
+	__u32 tgid;
+	__u32 len;
+	char name[NAME_MAX+1];
+};
+
+typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
+typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
+typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
+typedef struct autofs_v5_packet autofs_packet_expire_direct_t;
+
+union autofs_v5_packet_union {
+	struct autofs_packet_hdr hdr;
+	struct autofs_v5_packet v5_packet;
+	autofs_packet_missing_indirect_t missing_indirect;
+	autofs_packet_expire_indirect_t expire_indirect;
+	autofs_packet_missing_direct_t missing_direct;
+	autofs_packet_expire_direct_t expire_direct;
+};
+
+enum {
+	AUTOFS_IOC_EXPIRE_MULTI_CMD = 0x66, /* AUTOFS_IOC_EXPIRE_CMD + 1 */
+	AUTOFS_IOC_PROTOSUBVER_CMD,
+	AUTOFS_IOC_ASKUMOUNT_CMD = 0x70, /* AUTOFS_DEV_IOCTL_VERSION_CMD - 1 */
+};
+
+#define AUTOFS_IOC_EXPIRE_MULTI		_IOW(AUTOFS_IOCTL, \
+					     AUTOFS_IOC_EXPIRE_MULTI_CMD, int)
+#define AUTOFS_IOC_PROTOSUBVER		_IOR(AUTOFS_IOCTL, \
+					     AUTOFS_IOC_PROTOSUBVER_CMD, int)
+#define AUTOFS_IOC_ASKUMOUNT		_IOR(AUTOFS_IOCTL, \
+					     AUTOFS_IOC_ASKUMOUNT_CMD, int)
 
 #endif /* _UAPI_LINUX_AUTO_FS_H */
diff --git a/include/uapi/linux/auto_fs4.h b/include/uapi/linux/auto_fs4.h
index 1f608e27a06f..d01ef0a0189c 100644
--- a/include/uapi/linux/auto_fs4.h
+++ b/include/uapi/linux/auto_fs4.h
@@ -7,156 +7,9 @@
  * option, any later version, incorporated herein by reference.
  */
 
-#ifndef _LINUX_AUTO_FS4_H
-#define _LINUX_AUTO_FS4_H
+#ifndef _UAPI_LINUX_AUTO_FS4_H
+#define _UAPI_LINUX_AUTO_FS4_H
 
-/* Include common v3 definitions */
-#include <linux/types.h>
 #include <linux/auto_fs.h>
 
-/* autofs v4 definitions */
-#undef AUTOFS_PROTO_VERSION
-#undef AUTOFS_MIN_PROTO_VERSION
-#undef AUTOFS_MAX_PROTO_VERSION
-
-#define AUTOFS_PROTO_VERSION		5
-#define AUTOFS_MIN_PROTO_VERSION	3
-#define AUTOFS_MAX_PROTO_VERSION	5
-
-#define AUTOFS_PROTO_SUBVERSION		2
-
-/* Mask for expire behaviour */
-#define AUTOFS_EXP_IMMEDIATE		1
-#define AUTOFS_EXP_LEAVES		2
-
-#define AUTOFS_TYPE_ANY			0U
-#define AUTOFS_TYPE_INDIRECT		1U
-#define AUTOFS_TYPE_DIRECT		2U
-#define AUTOFS_TYPE_OFFSET		4U
-
-static inline void set_autofs_type_indirect(unsigned int *type)
-{
-	*type = AUTOFS_TYPE_INDIRECT;
-}
-
-static inline unsigned int autofs_type_indirect(unsigned int type)
-{
-	return (type == AUTOFS_TYPE_INDIRECT);
-}
-
-static inline void set_autofs_type_direct(unsigned int *type)
-{
-	*type = AUTOFS_TYPE_DIRECT;
-}
-
-static inline unsigned int autofs_type_direct(unsigned int type)
-{
-	return (type == AUTOFS_TYPE_DIRECT);
-}
-
-static inline void set_autofs_type_offset(unsigned int *type)
-{
-	*type = AUTOFS_TYPE_OFFSET;
-}
-
-static inline unsigned int autofs_type_offset(unsigned int type)
-{
-	return (type == AUTOFS_TYPE_OFFSET);
-}
-
-static inline unsigned int autofs_type_trigger(unsigned int type)
-{
-	return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET);
-}
-
-/*
- * This isn't really a type as we use it to say "no type set" to
- * indicate we want to search for "any" mount in the
- * autofs_dev_ioctl_ismountpoint() device ioctl function.
- */
-static inline void set_autofs_type_any(unsigned int *type)
-{
-	*type = AUTOFS_TYPE_ANY;
-}
-
-static inline unsigned int autofs_type_any(unsigned int type)
-{
-	return (type == AUTOFS_TYPE_ANY);
-}
-
-/* Daemon notification packet types */
-enum autofs_notify {
-	NFY_NONE,
-	NFY_MOUNT,
-	NFY_EXPIRE
-};
-
-/* Kernel protocol version 4 packet types */
-
-/* Expire entry (umount request) */
-#define autofs_ptype_expire_multi	2
-
-/* Kernel protocol version 5 packet types */
-
-/* Indirect mount missing and expire requests. */
-#define autofs_ptype_missing_indirect	3
-#define autofs_ptype_expire_indirect	4
-
-/* Direct mount missing and expire requests */
-#define autofs_ptype_missing_direct	5
-#define autofs_ptype_expire_direct	6
-
-/* v4 multi expire (via pipe) */
-struct autofs_packet_expire_multi {
-	struct autofs_packet_hdr hdr;
-	autofs_wqt_t wait_queue_token;
-	int len;
-	char name[NAME_MAX+1];
-};
-
-union autofs_packet_union {
-	struct autofs_packet_hdr hdr;
-	struct autofs_packet_missing missing;
-	struct autofs_packet_expire expire;
-	struct autofs_packet_expire_multi expire_multi;
-};
-
-/* autofs v5 common packet struct */
-struct autofs_v5_packet {
-	struct autofs_packet_hdr hdr;
-	autofs_wqt_t wait_queue_token;
-	__u32 dev;
-	__u64 ino;
-	__u32 uid;
-	__u32 gid;
-	__u32 pid;
-	__u32 tgid;
-	__u32 len;
-	char name[NAME_MAX+1];
-};
-
-typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
-typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
-typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
-typedef struct autofs_v5_packet autofs_packet_expire_direct_t;
-
-union autofs_v5_packet_union {
-	struct autofs_packet_hdr hdr;
-	struct autofs_v5_packet v5_packet;
-	autofs_packet_missing_indirect_t missing_indirect;
-	autofs_packet_expire_indirect_t expire_indirect;
-	autofs_packet_missing_direct_t missing_direct;
-	autofs_packet_expire_direct_t expire_direct;
-};
-
-enum {
-	AUTOFS_IOC_EXPIRE_MULTI_CMD = 0x66, /* AUTOFS_IOC_EXPIRE_CMD + 1 */
-	AUTOFS_IOC_PROTOSUBVER_CMD,
-	AUTOFS_IOC_ASKUMOUNT_CMD = 0x70, /* AUTOFS_DEV_IOCTL_VERSION_CMD - 1 */
-};
-
-#define AUTOFS_IOC_EXPIRE_MULTI    _IOW(AUTOFS_IOCTL, AUTOFS_IOC_EXPIRE_MULTI_CMD, int)
-#define AUTOFS_IOC_PROTOSUBVER     _IOR(AUTOFS_IOCTL, AUTOFS_IOC_PROTOSUBVER_CMD, int)
-#define AUTOFS_IOC_ASKUMOUNT       _IOR(AUTOFS_IOCTL, AUTOFS_IOC_ASKUMOUNT_CMD, int)
-
-#endif /* _LINUX_AUTO_FS4_H */
+#endif /* _UAPI_LINUX_AUTO_FS4_H */
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 8c317737ba3f..59b19b6a40d7 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -95,6 +95,9 @@ enum bpf_cmd {
 	BPF_OBJ_GET_INFO_BY_FD,
 	BPF_PROG_QUERY,
 	BPF_RAW_TRACEPOINT_OPEN,
+	BPF_BTF_LOAD,
+	BPF_BTF_GET_FD_BY_ID,
+	BPF_TASK_FD_QUERY,
 };
 
 enum bpf_map_type {
@@ -115,6 +118,8 @@ enum bpf_map_type {
 	BPF_MAP_TYPE_DEVMAP,
 	BPF_MAP_TYPE_SOCKMAP,
 	BPF_MAP_TYPE_CPUMAP,
+	BPF_MAP_TYPE_XSKMAP,
+	BPF_MAP_TYPE_SOCKHASH,
 };
 
 enum bpf_prog_type {
@@ -137,6 +142,8 @@ enum bpf_prog_type {
 	BPF_PROG_TYPE_SK_MSG,
 	BPF_PROG_TYPE_RAW_TRACEPOINT,
 	BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
+	BPF_PROG_TYPE_LWT_SEG6LOCAL,
+	BPF_PROG_TYPE_LIRC_MODE2,
 };
 
 enum bpf_attach_type {
@@ -154,6 +161,9 @@ enum bpf_attach_type {
 	BPF_CGROUP_INET6_CONNECT,
 	BPF_CGROUP_INET4_POST_BIND,
 	BPF_CGROUP_INET6_POST_BIND,
+	BPF_CGROUP_UDP4_SENDMSG,
+	BPF_CGROUP_UDP6_SENDMSG,
+	BPF_LIRC_MODE2,
 	__MAX_BPF_ATTACH_TYPE
 };
 
@@ -279,6 +289,9 @@ union bpf_attr {
 					 */
 		char	map_name[BPF_OBJ_NAME_LEN];
 		__u32	map_ifindex;	/* ifindex of netdev to create on */
+		__u32	btf_fd;		/* fd pointing to a BTF type data */
+		__u32	btf_key_type_id;	/* BTF type_id of the key */
+		__u32	btf_value_type_id;	/* BTF type_id of the value */
 	};
 
 	struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
@@ -339,6 +352,7 @@ union bpf_attr {
 			__u32		start_id;
 			__u32		prog_id;
 			__u32		map_id;
+			__u32		btf_id;
 		};
 		__u32		next_id;
 		__u32		open_flags;
@@ -363,398 +377,1704 @@ union bpf_attr {
 		__u64 name;
 		__u32 prog_fd;
 	} raw_tracepoint;
+
+	struct { /* anonymous struct for BPF_BTF_LOAD */
+		__aligned_u64	btf;
+		__aligned_u64	btf_log_buf;
+		__u32		btf_size;
+		__u32		btf_log_size;
+		__u32		btf_log_level;
+	};
+
+	struct {
+		__u32		pid;		/* input: pid */
+		__u32		fd;		/* input: fd */
+		__u32		flags;		/* input: flags */
+		__u32		buf_len;	/* input/output: buf len */
+		__aligned_u64	buf;		/* input/output:
+						 *   tp_name for tracepoint
+						 *   symbol for kprobe
+						 *   filename for uprobe
+						 */
+		__u32		prog_id;	/* output: prod_id */
+		__u32		fd_type;	/* output: BPF_FD_TYPE_* */
+		__u64		probe_offset;	/* output: probe_offset */
+		__u64		probe_addr;	/* output: probe_addr */
+	} task_fd_query;
 } __attribute__((aligned(8)));
 
-/* BPF helper function descriptions:
- *
- * void *bpf_map_lookup_elem(&map, &key)
- *     Return: Map value or NULL
- *
- * int bpf_map_update_elem(&map, &key, &value, flags)
- *     Return: 0 on success or negative error
- *
- * int bpf_map_delete_elem(&map, &key)
- *     Return: 0 on success or negative error
- *
- * int bpf_probe_read(void *dst, int size, void *src)
- *     Return: 0 on success or negative error
+/* The description below is an attempt at providing documentation to eBPF
+ * developers about the multiple available eBPF helper functions. It can be
+ * parsed and used to produce a manual page. The workflow is the following,
+ * and requires the rst2man utility:
+ *
+ *     $ ./scripts/bpf_helpers_doc.py \
+ *             --filename include/uapi/linux/bpf.h > /tmp/bpf-helpers.rst
+ *     $ rst2man /tmp/bpf-helpers.rst > /tmp/bpf-helpers.7
+ *     $ man /tmp/bpf-helpers.7
+ *
+ * Note that in order to produce this external documentation, some RST
+ * formatting is used in the descriptions to get "bold" and "italics" in
+ * manual pages. Also note that the few trailing white spaces are
+ * intentional, removing them would break paragraphs for rst2man.
+ *
+ * Start of BPF helper function descriptions:
+ *
+ * void *bpf_map_lookup_elem(struct bpf_map *map, const void *key)
+ * 	Description
+ * 		Perform a lookup in *map* for an entry associated to *key*.
+ * 	Return
+ * 		Map value associated to *key*, or **NULL** if no entry was
+ * 		found.
+ *
+ * int bpf_map_update_elem(struct bpf_map *map, const void *key, const void *value, u64 flags)
+ * 	Description
+ * 		Add or update the value of the entry associated to *key* in
+ * 		*map* with *value*. *flags* is one of:
+ *
+ * 		**BPF_NOEXIST**
+ * 			The entry for *key* must not exist in the map.
+ * 		**BPF_EXIST**
+ * 			The entry for *key* must already exist in the map.
+ * 		**BPF_ANY**
+ * 			No condition on the existence of the entry for *key*.
+ *
+ * 		Flag value **BPF_NOEXIST** cannot be used for maps of types
+ * 		**BPF_MAP_TYPE_ARRAY** or **BPF_MAP_TYPE_PERCPU_ARRAY**  (all
+ * 		elements always exist), the helper would return an error.
+ * 	Return
+ * 		0 on success, or a negative error in case of failure.
+ *
+ * int bpf_map_delete_elem(struct bpf_map *map, const void *key)
+ * 	Description
+ * 		Delete entry with *key* from *map*.
+ * 	Return
+ * 		0 on success, or a negative error in case of failure.
+ *
+ * int bpf_probe_read(void *dst, u32 size, const void *src)
+ * 	Description
+ * 		For tracing programs, safely attempt to read *size* bytes from
+ * 		address *src* an