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fs: Add missing umask strip in vfs_tmpfile 

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@fujitsu.com
Fixes: 60545d0d46 ("[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...")
Cc: <stable@vger.kernel.org> # 4.19+
Reported-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-and-Tested-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
This commit is contained in:
Yang Xu 2022-07-14 14:11:26 +08:00 committed by Christian Brauner (Microsoft)
parent 2b3416ceff
commit ac6800e279
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 2 additions and 0 deletions
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2
fs/namei.c
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@ -3565,6 +3565,8 @@ struct dentry *vfs_tmpfile(struct user_namespace *mnt_userns,
child = d_alloc(dentry, &slash_name);
if (unlikely(!child))
goto out_err;
if (!IS_POSIXACL(dir))
mode &= ~current_umask();
error = dir->i_op->tmpfile(mnt_userns, dir, child, mode);
if (error)
goto out_err;