linux-kernel - [PATCH 10/24] ubifs: Massage assert in ubifs_xattr

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Date:   Thu,  1 Dec 2016 22:20:57 +0100
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     david@...ma-star.at, tytso@....edu, dedekind1@...il.com,
        ebiggers@...gle.com, mhalcrow@...gle.com, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, hch@...radead.org,
        linux-fsdevel@...r.kernel.org, jaegeuk@...nel.org,
        dengler@...utronix.de, sbabic@...x.de, wd@...x.de,
        Richard Weinberger <richard@....at>
Subject: [PATCH 10/24] ubifs: Massage assert in ubifs_xattr_set() wrt. fscrypto

When we're creating a new inode in UBIFS the inode is not
yet exposed and fscrypto calls ubifs_xattr_set() without
holding the inode mutex. This is okay but ubifs_xattr_set()
has to know about this.

Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/xattr.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index 77ffc9788f45..da59ea3b50c4 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -289,7 +289,13 @@ int ubifs_xattr_set(struct inode *host, const char *name, const void *value,
 	union ubifs_key key;
 	int err;
 
-	ubifs_assert(inode_is_locked(host));
+	/*
+	 * Creating an encryption context is done unlocked since we
+	 * operate on a new inode which is not visible to other users
+	 * at this point.
+	 */
+	if (strcmp(name, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) != 0)
+		ubifs_assert(inode_is_locked(host));
 
 	if (size > UBIFS_MAX_INO_DATA)
 		return -ERANGE;
-- 
2.7.3