integrity/ima: switch to using __kernel_read

__kernel_read has a bunch of additional sanity checks, and this moves
the set_fs out of non-core code.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index e12c490..1d20003 100644 (file)
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -188,19 +188,7 @@ DEFINE_LSM(integrity) = {
 int integrity_kernel_read(struct file *file, loff_t offset,
                          void *addr, unsigned long count)
 {
-       mm_segment_t old_fs;
-       char __user *buf = (char __user *)addr;
-       ssize_t ret;
-
-       if (!(file->f_mode & FMODE_READ))
-               return -EBADF;
-
-       old_fs = get_fs();
-       set_fs(KERNEL_DS);
-       ret = __vfs_read(file, buf, count, &offset);
-       set_fs(old_fs);
-
-       return ret;
+       return __kernel_read(file, addr, count, &offset);
 }
 
 /*