linux-kernel - [PATCH 16/29] ubifs: Enforce crypto policy in mmap

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Message-Id: <1479072072-6844-17-git-send-email-richard@nod.at>
Date:   Sun, 13 Nov 2016 22:20:59 +0100
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        dedekind1@...il.com, adrian.hunter@...el.com, tytso@....edu,
        jaegeuk@...nel.org, david@...ma-star.at, wd@...x.de,
        sbabic@...x.de, dengler@...utronix.de, ebiggers@...gle.com,
        mhalcrow@...gle.com, hch@...radead.org,
        Richard Weinberger <richard@....at>
Subject: [PATCH 16/29] ubifs: Enforce crypto policy in mmap

We need this extra check in mmap because a process could
gain an already opened fd.

Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/file.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index a9c5cc6c0bc5..60e789a9cac8 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1594,6 +1594,15 @@ static const struct vm_operations_struct ubifs_file_vm_ops = {
 static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	int err;
+	struct inode *inode = file->f_mapping->host;
+
+	if (ubifs_crypt_is_encrypted(inode)) {
+		err = fscrypt_get_encryption_info(inode);
+		if (err)
+			return -EACCES;
+		if (!fscrypt_has_encryption_key(inode))
+			return -ENOKEY;
+	}
 
 	err = generic_file_mmap(file, vma);
 	if (err)
-- 
2.7.3