[PATCH 5/5] integrity: measure the file on msync

[Janne Karhunen]

When user requests a file msync, make sure that the IMA
measurement reflects the state of the data being sync'd.

Depends on commit c8213962517e ("integrity: keep the integrity state of open files up to date")'

Signed-off-by: Janne Karhunen <janne.karhunen at gmail.com>
Signed-off-by: Konsta Karsisto <konsta.karsisto at gmail.com>
---
 mm/msync.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/msync.c b/mm/msync.c
index ef30a429623a..5a256e08b49d 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -14,6 +14,7 @@
 #include <linux/file.h>
 #include <linux/syscalls.h>
 #include <linux/sched.h>
+#include <linux/ima.h>
 
 /*
  * MS_SYNC syncs the entire file - including mappings.
@@ -88,12 +89,18 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
 			get_file(file);
 			up_read(&mm->mmap_sem);
 			error = vfs_fsync_range(file, fstart, fend, 1);
+			if (!error)
+				ima_file_update(file);
+
 			fput(file);
 			if (error || start >= end)
 				goto out;
 			down_read(&mm->mmap_sem);
 			vma = find_vma(mm, start);
 		} else {
+			if (file)
+				ima_delayed_update(file);
+
 			if (start >= end) {
 				error = 0;
 				goto out_unlock;
-- 
2.17.1