Commit 5c86674b authored Feb 18, 2021 by Yurii Zubrytskyi Committed by Sahil Sonar Oct 25, 2023

ANDROID: Incremental fs: set the correct access to mapped files



Backing file needs to have write permissions for all users
even though the mounted view doesn't - otherwise incfs can't
change the internal file data.

Bug: 180535478
Test: adb install <apk>
Signed-off-by: Yurii Zubrytskyi <zyy@google.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: Ie25ff62b5b78a2f1f52de68d9b39c3a9825af82b

parent 27c6c021

fs/incfs/pseudo_files.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -863,6 +863,12 @@ static long ioctl_create_mapped_file(struct file file, void __user arg)
		if (error)
		goto out;

		error = chmod(file_dentry, args.mode \| 0222);
		if (error) {
		pr_debug("incfs: chmod err: %d\n", error);
		goto delete_file;
		}

		/* Save the file's size as an xattr for easy fetching in future. */
		size_attr_value = cpu_to_le64(args.size);
		error = vfs_setxattr(file_dentry, INCFS_XATTR_SIZE_NAME,