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 4.19-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-4.19 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
@@ -67,6 +67,11 @@ 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-4.19/ext4-apply-umask-if-acl-support-is-disabled.patch
