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[v4,2/8] fs: Add missing umask strip in vfs_tmpfile

Message ID 1650368834-2420-2-git-send-email-xuyang2018.jy@fujitsu.com (mailing list archive)
State New, archived
Headers show
Series [v4,1/8] fs: move sgid strip operation from inode_init_owner into inode_sgid_strip | expand

Commit Message

Yang Xu (Fujitsu) April 19, 2022, 11:47 a.m. UTC
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.

Reported-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
 fs/namei.c | 2 ++
 1 file changed, 2 insertions(+)
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diff --git a/fs/namei.c b/fs/namei.c
index 509657fdf4f5..73646e28fae0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3521,6 +3521,8 @@  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;