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From: Max Kellermann <mk@cm4all.com>
To: linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
	trond.myklebust@hammerspace.com, bfields@redhat.com,
	tytso@mit.edu, adilger.kernel@dilger.ca, hughd@google.com,
	anna.schumaker@netapp.com
Cc: linux-kernel@vger.kernel.org, Max Kellermann <mk@cm4all.com>,
	stable@vger.kernel.org
Subject: [PATCH v2 2/4] fs/ext4/acl: apply umask if ACL support is disabled
Date: Sat, 13 Jul 2019 06:11:58 +0200
Message-ID: <20190713041200.18566-2-mk@cm4all.com> (raw)
In-Reply-To: <20190713041200.18566-1-mk@cm4all.com>

The function ext4_init_acl() calls posix_acl_create() which is
responsible for applying the umask.  But without
CONFIG_EXT4_FS_POSIX_ACL, ext4_init_acl() is an empty inline function,
and nobody applies the umask.

This fixes a bug which causes the umask to be ignored with O_TMPFILE
on ext4:

 https://github.com/MusicPlayerDaemon/MPD/issues/558
 https://bugs.gentoo.org/show_bug.cgi?id=686142#c3
 https://bugzilla.kernel.org/show_bug.cgi?id=203625

Signed-off-by: Max Kellermann <mk@cm4all.com>
Cc: stable@vger.kernel.org
---
 fs/ext4/acl.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h
index 9b63f5416a2f..7f3b25b3fa6d 100644
--- a/fs/ext4/acl.h
+++ b/fs/ext4/acl.h
@@ -67,6 +67,11 @@ extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
 static inline int
 ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
 {
+	/* usually, the umask is applied by posix_acl_create(), but if
+	   ext4 ACL support is disabled at compile time, we need to do
+	   it here, because posix_acl_create() will never be called */
+	inode->i_mode &= ~current_umask();
+
 	return 0;
 }
 #endif  /* CONFIG_EXT4_FS_POSIX_ACL */
-- 
2.20.1


  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-13  4:11 [PATCH v2 1/4] fs/posix_acl: apply umask if superblock disables ACL support Max Kellermann
2019-07-13  4:11 ` Max Kellermann [this message]
2019-07-13  4:11 ` [PATCH v2 3/4] linux/fs.h: fix umask on NFS with CONFIG_FS_POSIX_ACL=n Max Kellermann
2019-07-13  4:12 ` [PATCH v2 4/4] nfs/super: check NFS_CAP_ACLS instead of the NFS version Max Kellermann

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