Patch "ext4: apply umask if ACL support is disabled" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    ext4: apply umask if ACL support is disabled

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ext4-apply-umask-if-acl-support-is-disabled.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 484fd6c1de13b336806a967908a927cc0356e312 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@xxxxxxxxx>
Date: Tue, 19 Sep 2023 10:18:23 +0200
Subject: ext4: apply umask if ACL support is disabled

From: Max Kellermann <max.kellermann@xxxxxxxxx>

commit 484fd6c1de13b336806a967908a927cc0356e312 upstream.

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

Reviewed-by: "J. Bruce Fields" <bfields@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Max Kellermann <max.kellermann@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230919081824.1096619-1-max.kellermann@xxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ext4/acl.h |    5 +++++
 1 file changed, 5 insertions(+)

--- a/fs/ext4/acl.h
+++ b/fs/ext4/acl.h
@@ -68,6 +68,11 @@ extern int ext4_init_acl(handle_t *, str
 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 */


Patches currently in stable-queue which might be from max.kellermann@xxxxxxxxx are

queue-5.15/ext4-apply-umask-if-acl-support-is-disabled.patch



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