This is a note to let you know that I've just added the patch titled
fs: Add missing umask strip in vfs_tmpfile
to the 5.4-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:
fs-add-missing-umask-strip-in-vfs_tmpfile.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ac6800e279a22b28f4fc21439843025a0d5bf03e Mon Sep 17 00:00:00 2001
From: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
Date: Thu, 14 Jul 2022 14:11:26 +0800
Subject: fs: Add missing umask strip in vfs_tmpfile
From: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
commit ac6800e279a22b28f4fc21439843025a0d5bf03e upstream.
All creation paths except for O_TMPFILE handle umask in the vfs directly
if the filesystem doesn't support or enable POSIX ACLs. If the filesystem
does then umask handling is deferred until posix_acl_create().
Because, O_TMPFILE misses umask handling in the vfs it will not honor
umask settings. Fix this by adding the missing umask handling.
Link: https://lore.kernel.org/r/1657779088-2242-2-git-send-email-xuyang2018.jy@xxxxxxxxxxx
Fixes: 60545d0d4610 ("[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...")
Cc: <stable@xxxxxxxxxxxxxxx> # 4.19+
Reported-by: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-and-Tested-by: Jeff Layton <jlayton@xxxxxxxxxx>
Acked-by: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
Signed-off-by: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/namei.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3443,6 +3443,8 @@ struct dentry *vfs_tmpfile(struct dentry
child = d_alloc(dentry, &slash_name);
if (unlikely(!child))
goto out_err;
+ if (!IS_POSIXACL(dir))
+ mode &= ~current_umask();
error = dir->i_op->tmpfile(dir, child, mode);
if (error)
goto out_err;
Patches currently in stable-queue which might be from xuyang2018.jy@xxxxxxxxxxx are
queue-5.4/fs-add-missing-umask-strip-in-vfs_tmpfile.patch
