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Commit 08adb7da authored by Al Viro's avatar Al Viro
Browse files

fold verify_iovec() into copy_msghdr_from_user() 



... and do the same on the compat side of things.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 08449320

include/linux/socket.h

+0 −1
Original line number Diff line number Diff line
@@ -322,7 +322,6 @@ extern int csum_partial_copy_fromiovecend(unsigned char *kdata, 
extern unsigned long iov_pages(const struct iovec *iov, int offset,

			       unsigned long nr_segs);



extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode);

extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);

extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);

include/net/compat.h

+2 −3
Original line number Diff line number Diff line
@@ -40,9 +40,8 @@ int compat_sock_get_timestampns(struct sock *, struct timespec __user *); 
#define compat_mmsghdr	mmsghdr

#endif /* defined(CONFIG_COMPAT) */



int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);

int verify_compat_iovec(struct msghdr *, struct iovec *,

			struct sockaddr_storage *, int);

ssize_t get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,

		      struct sockaddr __user **, struct iovec **);

asmlinkage long compat_sys_sendmsg(int, struct compat_msghdr __user *,

				   unsigned int);

asmlinkage long compat_sys_sendmmsg(int, struct compat_mmsghdr __user *,

net/compat.c

+22 −30
Original line number Diff line number Diff line
@@ -31,14 +31,18 @@ 
#include <asm/uaccess.h>

#include <net/compat.h>



int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)

ssize_t get_compat_msghdr(struct msghdr *kmsg,

			  struct compat_msghdr __user *umsg,

			  struct sockaddr __user **save_addr,

			  struct iovec **iov)

{

	compat_uptr_t tmp1, tmp2, tmp3;

	compat_uptr_t uaddr, uiov, tmp3;

	ssize_t err;



	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||

	    __get_user(tmp1, &umsg->msg_name) ||

	    __get_user(uaddr, &umsg->msg_name) ||

	    __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||

	    __get_user(tmp2, &umsg->msg_iov) ||

	    __get_user(uiov, &umsg->msg_iov) ||

	    __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||

	    __get_user(tmp3, &umsg->msg_control) ||

	    __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
@@ -46,44 +50,32 @@ int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 
		return -EFAULT;

	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))

		kmsg->msg_namelen = sizeof(struct sockaddr_storage);

	kmsg->msg_name = compat_ptr(tmp1);

	kmsg->msg_iov = compat_ptr(tmp2);

	kmsg->msg_control = compat_ptr(tmp3);

	return 0;

}



/* I've named the args so it is easy to tell whose space the pointers are in. */

int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *iov,

		   struct sockaddr_storage *kern_address, int mode)

{

	struct compat_iovec __user *p;

	struct iovec *res;

	int err;

	if (save_addr)

		*save_addr = compat_ptr(uaddr);



	if (kern_msg->msg_name && kern_msg->msg_namelen) {

		if (mode == WRITE) {

			int err = move_addr_to_kernel(kern_msg->msg_name,

						      kern_msg->msg_namelen,

						      kern_address);

	if (uaddr && kmsg->msg_namelen) {

		if (!save_addr) {

			err = move_addr_to_kernel(compat_ptr(uaddr),

						  kmsg->msg_namelen,

						  kmsg->msg_name);

			if (err < 0)

				return err;

		}

		kern_msg->msg_name = kern_address;

	} else {

		kern_msg->msg_name = NULL;

		kern_msg->msg_namelen = 0;

		kmsg->msg_name = NULL;

		kmsg->msg_namelen = 0;

	}



	if (kern_msg->msg_iovlen > UIO_MAXIOV)

	if (kmsg->msg_iovlen > UIO_MAXIOV)

		return -EMSGSIZE;



	p = (struct compat_iovec __user *)kern_msg->msg_iov;

	err = compat_rw_copy_check_uvector(mode, p, kern_msg->msg_iovlen,

					   UIO_FASTIOV, iov, &res);

	err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,

					   compat_ptr(uiov), kmsg->msg_iovlen,

					   UIO_FASTIOV, *iov, iov);

	if (err >= 0)

		kern_msg->msg_iov = res;

	else if (res != iov)

		kfree(res);

		kmsg->msg_iov = *iov;

	return err;

}

net/core/iovec.c

+0 −38
Original line number Diff line number Diff line
@@ -27,44 +27,6 @@ 
#include <net/checksum.h>

#include <net/sock.h>



/*

 *	Verify iovec. The caller must ensure that the iovec is big enough

 *	to hold the message iovec.

 *

 *	Save time not doing access_ok. copy_*_user will make this work

 *	in any case.

 */



int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode)

{

	struct iovec *res;

	int err;



	if (m->msg_name && m->msg_namelen) {

		if (mode == WRITE) {

			void __user *namep = (void __user __force *)m->msg_name;

			int err = move_addr_to_kernel(namep, m->msg_namelen,

						  address);

			if (err < 0)

				return err;

		}

		m->msg_name = address;

	} else {

		m->msg_name = NULL;

		m->msg_namelen = 0;

	}

	if (m->msg_iovlen > UIO_MAXIOV)

		return -EMSGSIZE;



	err = rw_copy_check_uvector(mode, (void __user __force *)m->msg_iov,

				    m->msg_iovlen, UIO_FASTIOV, iov, &res);

	if (err >= 0)

		m->msg_iov = res;

	else if (res != iov)

		kfree(res);

	return err;

}



/*

 *	And now for the all-in-one: copy and checksum from a user iovec

 *	directly to a datagram

net/socket.c

+53 −40
Original line number Diff line number Diff line
@@ -1988,16 +1988,26 @@ struct used_address { 
	unsigned int name_len;

};



static int copy_msghdr_from_user(struct msghdr *kmsg,

				 struct user_msghdr __user *umsg)

static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,

				     struct user_msghdr __user *umsg,

				     struct sockaddr __user **save_addr,

				     struct iovec **iov)

{

	/* We are relying on the (currently) identical layouts.  Once

	 * the kernel-side changes, this place will need to be updated

	 */

	if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))

	struct sockaddr __user *uaddr;

	struct iovec __user *uiov;

	ssize_t err;



	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||

	    __get_user(uaddr, &umsg->msg_name) ||

	    __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||

	    __get_user(uiov, &umsg->msg_iov) ||

	    __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||

	    __get_user(kmsg->msg_control, &umsg->msg_control) ||

	    __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||

	    __get_user(kmsg->msg_flags, &umsg->msg_flags))

		return -EFAULT;



	if (kmsg->msg_name == NULL)

	if (!uaddr)

		kmsg->msg_namelen = 0;



	if (kmsg->msg_namelen < 0)
@@ -2005,7 +2015,31 @@ static int copy_msghdr_from_user(struct msghdr *kmsg, 


	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))

		kmsg->msg_namelen = sizeof(struct sockaddr_storage);

	return 0;



	if (save_addr)

		*save_addr = uaddr;



	if (uaddr && kmsg->msg_namelen) {

		if (!save_addr) {

			err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,

						  kmsg->msg_name);

			if (err < 0)

				return err;

		}

	} else {

		kmsg->msg_name = NULL;

		kmsg->msg_namelen = 0;

	}



	if (kmsg->msg_iovlen > UIO_MAXIOV)

		return -EMSGSIZE;



	err = rw_copy_check_uvector(save_addr ? READ : WRITE,

				    uiov, kmsg->msg_iovlen,

				    UIO_FASTIOV, *iov, iov);

	if (err >= 0)

		kmsg->msg_iov = *iov;

	return err;

}



static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
@@ -2020,26 +2054,17 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));

	/* 20 is size of ipv6_pktinfo */

	unsigned char *ctl_buf = ctl;

	int err, ctl_len, total_len;

	int ctl_len, total_len;

	ssize_t err;



	err = -EFAULT;

	if (MSG_CMSG_COMPAT & flags) {

		if (get_compat_msghdr(msg_sys, msg_compat))

			return -EFAULT;

	} else {

		err = copy_msghdr_from_user(msg_sys, msg);

		if (err)

			return err;

	}

	msg_sys->msg_name = &address;



	/* This will also move the address data into kernel space */

	if (MSG_CMSG_COMPAT & flags)

		err = verify_compat_iovec(msg_sys, iovstack, &address, WRITE);

		err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);

	else

		err = verify_iovec(msg_sys, iovstack, &address, WRITE);

		err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);

	if (err < 0)

		goto out_freeiov;

	iov = msg_sys->msg_iov;

	total_len = err;



	err = -ENOBUFS;
@@ -2215,36 +2240,24 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 
	struct iovec iovstack[UIO_FASTIOV];

	struct iovec *iov = iovstack;

	unsigned long cmsg_ptr;

	int err, total_len, len;

	int total_len, len;

	ssize_t err;



	/* kernel mode address */

	struct sockaddr_storage addr;



	/* user mode address pointers */

	struct sockaddr __user *uaddr;

	int __user *uaddr_len;

	int __user *uaddr_len = COMPAT_NAMELEN(msg);



	if (MSG_CMSG_COMPAT & flags) {

		if (get_compat_msghdr(msg_sys, msg_compat))

			return -EFAULT;

	} else {

		err = copy_msghdr_from_user(msg_sys, msg);

		if (err)

			return err;

	}

	msg_sys->msg_name = &addr;



	/* Save the user-mode address (verify_iovec will change the

	 * kernel msghdr to use the kernel address space)

	 */

	uaddr = (__force void __user *)msg_sys->msg_name;

	uaddr_len = COMPAT_NAMELEN(msg);

	if (MSG_CMSG_COMPAT & flags)

		err = verify_compat_iovec(msg_sys, iovstack, &addr, READ);

		err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);

	else

		err = verify_iovec(msg_sys, iovstack, &addr, READ);

		err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);

	if (err < 0)

		goto out_freeiov;

	iov = msg_sys->msg_iov;

	total_len = err;



	cmsg_ptr = (unsigned long)msg_sys->msg_control;