Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus

[pandora-kernel.git] / fs / splice.c

diff --git a/fs/splice.c b/fs/splice.c
index 59a941d..9b559ee 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -254,11 +254,16 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
        }
 
        while (page_nr < spd_pages)
-               page_cache_release(spd->pages[page_nr++]);
+               spd->spd_release(spd, page_nr++);
 
        return ret;
 }
 
+static void spd_release_page(struct splice_pipe_desc *spd, unsigned int i)
+{
+       page_cache_release(spd->pages[i]);
+}
+
 static int
 __generic_file_splice_read(struct file *in, loff_t *ppos,
                           struct pipe_inode_info *pipe, size_t len,
@@ -277,6 +282,7 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
                .partial = partial,
                .flags = flags,
                .ops = &page_cache_pipe_buf_ops,
+               .spd_release = spd_release_page,
        };
 
        index = *ppos >> PAGE_CACHE_SHIFT;
@@ -824,13 +830,18 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
 {
        struct address_space *mapping = out->f_mapping;
        struct inode *inode = mapping->host;
+       int killsuid, killpriv;
        ssize_t ret;
-       int err;
+       int err = 0;
 
-       err = should_remove_suid(out->f_path.dentry);
-       if (unlikely(err)) {
+       killpriv = security_inode_need_killpriv(out->f_path.dentry);
+       killsuid = should_remove_suid(out->f_path.dentry);
+       if (unlikely(killsuid || killpriv)) {
                mutex_lock(&inode->i_mutex);
-               err = __remove_suid(out->f_path.dentry, err);
+               if (killpriv)
+                       err = security_inode_killpriv(out->f_path.dentry);
+               if (!err && killsuid)
+                       err = __remove_suid(out->f_path.dentry, killsuid);
                mutex_unlock(&inode->i_mutex);
                if (err)
                        return err;
@@ -903,10 +914,6 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
        if (unlikely(ret < 0))
                return ret;
 
-       ret = security_file_permission(out, MAY_WRITE);
-       if (unlikely(ret < 0))
-               return ret;
-
        return out->f_op->splice_write(pipe, out, ppos, len, flags);
 }
 
@@ -929,10 +936,6 @@ static long do_splice_to(struct file *in, loff_t *ppos,
        if (unlikely(ret < 0))
                return ret;
 
-       ret = security_file_permission(in, MAY_READ);
-       if (unlikely(ret < 0))
-               return ret;
-
        return in->f_op->splice_read(in, ppos, pipe, len, flags);
 }
 
@@ -1028,7 +1031,9 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
                        goto out_release;
        }
 
+done:
        pipe->nrbufs = pipe->curbuf = 0;
+       file_accessed(in);
        return bytes;
 
 out_release:
@@ -1044,16 +1049,11 @@ out_release:
                        buf->ops = NULL;
                }
        }
-       pipe->nrbufs = pipe->curbuf = 0;
 
-       /*
-        * If we transferred some data, return the number of bytes:
-        */
-       if (bytes > 0)
-               return bytes;
-
-       return ret;
+       if (!bytes)
+               bytes = ret;
 
+       goto done;
 }
 EXPORT_SYMBOL(splice_direct_to_actor);
 
@@ -1179,6 +1179,9 @@ static int copy_from_user_mmap_sem(void *dst, const void __user *src, size_t n)
 {
        int partial;
 
+       if (!access_ok(VERIFY_READ, src, n))
+               return -EFAULT;
+
        pagefault_disable();
        partial = __copy_from_user_inatomic(dst, src, n);
        pagefault_enable();
@@ -1231,7 +1234,7 @@ static int get_iovec_page_array(const struct iovec __user *iov,
                if (unlikely(!len))
                        break;
                error = -EFAULT;
-               if (unlikely(!base))
+               if (!access_ok(VERIFY_READ, base, len))
                        break;
 
                /*
@@ -1387,6 +1390,11 @@ static long vmsplice_to_user(struct file *file, const struct iovec __user *iov,
                        break;
                }
 
+               if (unlikely(!access_ok(VERIFY_WRITE, base, len))) {
+                       error = -EFAULT;
+                       break;
+               }
+
                sd.len = 0;
                sd.total_len = len;
                sd.flags = flags;
@@ -1435,6 +1443,7 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *iov,
                .partial = partial,
                .flags = flags,
                .ops = &user_page_pipe_buf_ops,
+               .spd_release = spd_release_page,
        };
 
        pipe = pipe_info(file->f_path.dentry->d_inode);