Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[linux.git] / net / compat.c

diff --git a/net/compat.c b/net/compat.c
index d69f539ca0bc5021fd8b20f6ee6297ccd07cad28..6ded6c821d7a21f296d14db02552ea1c71643051 100644 (file)
--- a/net/compat.c
+++ b/net/compat.c
@@ -37,21 +37,16 @@ int get_compat_msghdr(struct msghdr *kmsg,
                      struct sockaddr __user **save_addr,
                      struct iovec **iov)
 {
-       compat_uptr_t uaddr, uiov, tmp3;
-       compat_size_t nr_segs;
+       struct compat_msghdr msg;
        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(nr_segs, &umsg->msg_iovlen) ||
-           __get_user(tmp3, &umsg->msg_control) ||
-           __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
-           __get_user(kmsg->msg_flags, &umsg->msg_flags))
+       if (copy_from_user(&msg, umsg, sizeof(*umsg)))
                return -EFAULT;
 
-       if (!uaddr)
+       kmsg->msg_flags = msg.msg_flags;
+       kmsg->msg_namelen = msg.msg_namelen;
+
+       if (!msg.msg_name)
                kmsg->msg_namelen = 0;
 
        if (kmsg->msg_namelen < 0)
@@ -59,14 +54,16 @@ int get_compat_msghdr(struct msghdr *kmsg,
 
        if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
                kmsg->msg_namelen = sizeof(struct sockaddr_storage);
-       kmsg->msg_control = compat_ptr(tmp3);
+
+       kmsg->msg_control = compat_ptr(msg.msg_control);
+       kmsg->msg_controllen = msg.msg_controllen;
 
        if (save_addr)
-               *save_addr = compat_ptr(uaddr);
+               *save_addr = compat_ptr(msg.msg_name);
 
-       if (uaddr && kmsg->msg_namelen) {
+       if (msg.msg_name && kmsg->msg_namelen) {
                if (!save_addr) {
-                       err = move_addr_to_kernel(compat_ptr(uaddr),
+                       err = move_addr_to_kernel(compat_ptr(msg.msg_name),
                                                  kmsg->msg_namelen,
                                                  kmsg->msg_name);
                        if (err < 0)
@@ -77,13 +74,13 @@ int get_compat_msghdr(struct msghdr *kmsg,
                kmsg->msg_namelen = 0;
        }
 
-       if (nr_segs > UIO_MAXIOV)
+       if (msg.msg_iovlen > UIO_MAXIOV)
                return -EMSGSIZE;
 
        kmsg->msg_iocb = NULL;
 
        return compat_import_iovec(save_addr ? READ : WRITE,
-                                  compat_ptr(uiov), nr_segs,
+                                  compat_ptr(msg.msg_iov), msg.msg_iovlen,
                                   UIO_FASTIOV, iov, &kmsg->msg_iter);
 }
 
@@ -91,11 +88,11 @@ int get_compat_msghdr(struct msghdr *kmsg,
 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
 
 #define CMSG_COMPAT_DATA(cmsg)                         \
-       ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
+       ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
 #define CMSG_COMPAT_SPACE(len)                         \
-       (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
+       (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
 #define CMSG_COMPAT_LEN(len)                           \
-       (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
+       (sizeof(struct compat_cmsghdr) + (len))
 
 #define CMSG_COMPAT_FIRSTHDR(msg)                      \
        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
@@ -131,6 +128,9 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
        __kernel_size_t kcmlen, tmp;
        int err = -EFAULT;
 
+       BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
+                    CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
+
        kcmlen = 0;
        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
@@ -142,8 +142,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
                        return -EINVAL;
 
-               tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
-                      CMSG_ALIGN(sizeof(struct cmsghdr)));
+               tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
                tmp = CMSG_ALIGN(tmp);
                kcmlen += tmp;
                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
@@ -169,8 +168,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
                        goto Efault;
                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
                        goto Einval;
-               tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
-                      CMSG_ALIGN(sizeof(struct cmsghdr)));
+               tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
                        goto Einval;
                kcmsg->cmsg_len = tmp;
@@ -179,7 +177,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
                    copy_from_user(CMSG_DATA(kcmsg),
                                   CMSG_COMPAT_DATA(ucmsg),
-                                  (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
+                                  (ucmlen - sizeof(*ucmsg))))
                        goto Efault;
 
                /* Advance. */
@@ -315,15 +313,15 @@ struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 {
        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
-       compat_uptr_t ptr;
-       u16 len;
-
-       if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
-           !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
-           __get_user(len, &fprog32->len) ||
-           __get_user(ptr, &fprog32->filter) ||
-           __put_user(len, &kfprog->len) ||
-           __put_user(compat_ptr(ptr), &kfprog->filter))
+       struct compat_sock_fprog f32;
+       struct sock_fprog f;
+
+       if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
+               return NULL;
+       memset(&f, 0, sizeof(f));
+       f.len = f32.len;
+       f.filter = compat_ptr(f32.filter);
+       if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
                return NULL;
 
        return kfprog;