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fold verify_iovec() into copy_msghdr_from_user()
... and do the same on the compat side of things. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
0844932009
commit
08adb7dabd
5 changed files with 77 additions and 112 deletions
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@ -322,7 +322,6 @@ extern int csum_partial_copy_fromiovecend(unsigned char *kdata,
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extern unsigned long iov_pages(const struct iovec *iov, int offset,
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unsigned long nr_segs);
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extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode);
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extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
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extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
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@ -40,9 +40,8 @@ int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
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#define compat_mmsghdr mmsghdr
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#endif /* defined(CONFIG_COMPAT) */
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int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);
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int verify_compat_iovec(struct msghdr *, struct iovec *,
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struct sockaddr_storage *, int);
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ssize_t get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
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struct sockaddr __user **, struct iovec **);
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asmlinkage long compat_sys_sendmsg(int, struct compat_msghdr __user *,
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unsigned int);
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asmlinkage long compat_sys_sendmmsg(int, struct compat_mmsghdr __user *,
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52
net/compat.c
52
net/compat.c
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@ -31,14 +31,18 @@
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#include <asm/uaccess.h>
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#include <net/compat.h>
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int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
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ssize_t get_compat_msghdr(struct msghdr *kmsg,
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struct compat_msghdr __user *umsg,
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struct sockaddr __user **save_addr,
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struct iovec **iov)
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{
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compat_uptr_t tmp1, tmp2, tmp3;
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compat_uptr_t uaddr, uiov, tmp3;
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ssize_t err;
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if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
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__get_user(tmp1, &umsg->msg_name) ||
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__get_user(uaddr, &umsg->msg_name) ||
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__get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
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__get_user(tmp2, &umsg->msg_iov) ||
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__get_user(uiov, &umsg->msg_iov) ||
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__get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
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__get_user(tmp3, &umsg->msg_control) ||
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__get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
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@ -46,44 +50,32 @@ int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
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return -EFAULT;
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if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
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kmsg->msg_namelen = sizeof(struct sockaddr_storage);
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kmsg->msg_name = compat_ptr(tmp1);
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kmsg->msg_iov = compat_ptr(tmp2);
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kmsg->msg_control = compat_ptr(tmp3);
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return 0;
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}
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/* I've named the args so it is easy to tell whose space the pointers are in. */
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int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *iov,
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struct sockaddr_storage *kern_address, int mode)
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{
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struct compat_iovec __user *p;
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struct iovec *res;
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int err;
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if (save_addr)
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*save_addr = compat_ptr(uaddr);
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if (kern_msg->msg_name && kern_msg->msg_namelen) {
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if (mode == WRITE) {
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int err = move_addr_to_kernel(kern_msg->msg_name,
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kern_msg->msg_namelen,
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kern_address);
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if (uaddr && kmsg->msg_namelen) {
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if (!save_addr) {
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err = move_addr_to_kernel(compat_ptr(uaddr),
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kmsg->msg_namelen,
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kmsg->msg_name);
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if (err < 0)
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return err;
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}
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kern_msg->msg_name = kern_address;
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} else {
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kern_msg->msg_name = NULL;
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kern_msg->msg_namelen = 0;
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kmsg->msg_name = NULL;
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kmsg->msg_namelen = 0;
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}
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if (kern_msg->msg_iovlen > UIO_MAXIOV)
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if (kmsg->msg_iovlen > UIO_MAXIOV)
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return -EMSGSIZE;
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p = (struct compat_iovec __user *)kern_msg->msg_iov;
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err = compat_rw_copy_check_uvector(mode, p, kern_msg->msg_iovlen,
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UIO_FASTIOV, iov, &res);
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err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,
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compat_ptr(uiov), kmsg->msg_iovlen,
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UIO_FASTIOV, *iov, iov);
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if (err >= 0)
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kern_msg->msg_iov = res;
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else if (res != iov)
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kfree(res);
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kmsg->msg_iov = *iov;
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return err;
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}
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@ -27,44 +27,6 @@
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#include <net/checksum.h>
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#include <net/sock.h>
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/*
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* Verify iovec. The caller must ensure that the iovec is big enough
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* to hold the message iovec.
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*
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* Save time not doing access_ok. copy_*_user will make this work
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* in any case.
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*/
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int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode)
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{
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struct iovec *res;
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int err;
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if (m->msg_name && m->msg_namelen) {
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if (mode == WRITE) {
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void __user *namep = (void __user __force *)m->msg_name;
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int err = move_addr_to_kernel(namep, m->msg_namelen,
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address);
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if (err < 0)
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return err;
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}
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m->msg_name = address;
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} else {
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m->msg_name = NULL;
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m->msg_namelen = 0;
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}
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if (m->msg_iovlen > UIO_MAXIOV)
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return -EMSGSIZE;
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err = rw_copy_check_uvector(mode, (void __user __force *)m->msg_iov,
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m->msg_iovlen, UIO_FASTIOV, iov, &res);
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if (err >= 0)
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m->msg_iov = res;
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else if (res != iov)
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kfree(res);
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return err;
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}
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/*
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* And now for the all-in-one: copy and checksum from a user iovec
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* directly to a datagram
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93
net/socket.c
93
net/socket.c
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@ -1988,16 +1988,26 @@ struct used_address {
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unsigned int name_len;
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};
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static int copy_msghdr_from_user(struct msghdr *kmsg,
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struct user_msghdr __user *umsg)
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static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
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struct user_msghdr __user *umsg,
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struct sockaddr __user **save_addr,
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struct iovec **iov)
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{
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/* We are relying on the (currently) identical layouts. Once
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* the kernel-side changes, this place will need to be updated
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*/
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if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
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struct sockaddr __user *uaddr;
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struct iovec __user *uiov;
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ssize_t err;
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if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
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__get_user(uaddr, &umsg->msg_name) ||
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__get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
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__get_user(uiov, &umsg->msg_iov) ||
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__get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
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__get_user(kmsg->msg_control, &umsg->msg_control) ||
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__get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
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__get_user(kmsg->msg_flags, &umsg->msg_flags))
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return -EFAULT;
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if (kmsg->msg_name == NULL)
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if (!uaddr)
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kmsg->msg_namelen = 0;
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if (kmsg->msg_namelen < 0)
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@ -2005,7 +2015,31 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
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if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
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kmsg->msg_namelen = sizeof(struct sockaddr_storage);
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return 0;
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if (save_addr)
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*save_addr = uaddr;
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if (uaddr && kmsg->msg_namelen) {
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if (!save_addr) {
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err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
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kmsg->msg_name);
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if (err < 0)
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return err;
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}
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} else {
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kmsg->msg_name = NULL;
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kmsg->msg_namelen = 0;
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}
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if (kmsg->msg_iovlen > UIO_MAXIOV)
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return -EMSGSIZE;
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err = rw_copy_check_uvector(save_addr ? READ : WRITE,
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uiov, kmsg->msg_iovlen,
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UIO_FASTIOV, *iov, iov);
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if (err >= 0)
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kmsg->msg_iov = *iov;
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return err;
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}
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static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
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@ -2020,26 +2054,17 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
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__attribute__ ((aligned(sizeof(__kernel_size_t))));
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/* 20 is size of ipv6_pktinfo */
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unsigned char *ctl_buf = ctl;
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int err, ctl_len, total_len;
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int ctl_len, total_len;
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ssize_t err;
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err = -EFAULT;
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if (MSG_CMSG_COMPAT & flags) {
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if (get_compat_msghdr(msg_sys, msg_compat))
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return -EFAULT;
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} else {
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err = copy_msghdr_from_user(msg_sys, msg);
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if (err)
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return err;
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}
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msg_sys->msg_name = &address;
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/* This will also move the address data into kernel space */
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if (MSG_CMSG_COMPAT & flags)
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err = verify_compat_iovec(msg_sys, iovstack, &address, WRITE);
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err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
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else
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err = verify_iovec(msg_sys, iovstack, &address, WRITE);
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err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
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if (err < 0)
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goto out_freeiov;
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iov = msg_sys->msg_iov;
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total_len = err;
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err = -ENOBUFS;
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@ -2215,36 +2240,24 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
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struct iovec iovstack[UIO_FASTIOV];
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struct iovec *iov = iovstack;
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unsigned long cmsg_ptr;
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int err, total_len, len;
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int total_len, len;
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ssize_t err;
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/* kernel mode address */
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struct sockaddr_storage addr;
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/* user mode address pointers */
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struct sockaddr __user *uaddr;
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int __user *uaddr_len;
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int __user *uaddr_len = COMPAT_NAMELEN(msg);
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if (MSG_CMSG_COMPAT & flags) {
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if (get_compat_msghdr(msg_sys, msg_compat))
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return -EFAULT;
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} else {
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err = copy_msghdr_from_user(msg_sys, msg);
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if (err)
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return err;
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}
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msg_sys->msg_name = &addr;
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/* Save the user-mode address (verify_iovec will change the
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* kernel msghdr to use the kernel address space)
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*/
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uaddr = (__force void __user *)msg_sys->msg_name;
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uaddr_len = COMPAT_NAMELEN(msg);
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if (MSG_CMSG_COMPAT & flags)
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err = verify_compat_iovec(msg_sys, iovstack, &addr, READ);
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err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
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else
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err = verify_iovec(msg_sys, iovstack, &addr, READ);
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err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
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if (err < 0)
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goto out_freeiov;
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iov = msg_sys->msg_iov;
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total_len = err;
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cmsg_ptr = (unsigned long)msg_sys->msg_control;
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