vfs: define kernel_copy_file_from_fd()

This patch defines kernel_read_file_from_fd(), a wrapper for the VFS
common kernel_read_file().

Changelog:
- Separated from the kernel modules patch
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

diff --git a/fs/exec.c b/fs/exec.c
index 8aaa386..9bdf0ed 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -907,6 +907,22 @@ int kernel_read_file_from_path(char *path, void **buf, loff_t *size,
 }
 EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
 
+int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size,
+                            enum kernel_read_file_id id)
+{
+       struct fd f = fdget(fd);
+       int ret = -EBADF;
+
+       if (!f.file)
+               goto out;
+
+       ret = kernel_read_file(f.file, buf, size, max_size, id);
+out:
+       fdput(f);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(kernel_read_file_from_fd);
+
 ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
 {
        ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c8bc4d8..9c85dea 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2586,6 +2586,8 @@ extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
                            enum kernel_read_file_id);
 extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
                                      enum kernel_read_file_id);
+extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t,
+                                   enum kernel_read_file_id);
 extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
 extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
 extern struct file * open_exec(const char *);