[PATCH 4/4] ima: use read_iter (generic_file_read_iter) to calculate file hash

The large marjority of filesystems in the fs directory define
generic_file_read_iter as the read_iter file operation method.

Instead of specifying the integrity_read file operation method
for all of these file systems, continue to calculate the file
hash using the read_iter method, when defined as
generic_file_read_iter.

For all other read_iter methods, define an integrity_read
method.

Signed-off-by: Mimi Zohar <redacted>
---
 security/integrity/iint.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index e3ef3fba16dc..8164f57f5cea 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c

@@ -202,6 +202,9 @@ int integrity_kernel_read(struct file *file, loff_t offset,
 
 	if (file->f_op->integrity_read) {
 		ret = file->f_op->integrity_read(&kiocb, &iter);
+	} else if (file->f_op->read_iter &&
+		   file->f_op->read_iter == generic_file_read_iter) {
+		ret = file->f_op->read_iter(&kiocb, &iter);
 	} else if (file->f_op->read) {
 		mm_segment_t old_fs;
 		char __user *buf = (char __user *)addr;

-- 
2.7.4

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