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.
Fixes: 60545d0d4610 ("[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 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(+)
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;
On Mon, Apr 25, 2022 at 11:09:39AM +0800, Yang Xu wrote:
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.
Fixes: 60545d0d4610 ("[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...")
If I had a nickel for every time I felt like I was short a few helpers... ;)
Reviewed-by: Darrick J. Wong djwong@kernel.org
--D
Cc: stable@vger.kernel.org # 4.19+ 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(+)
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();-- 2.27.0
linux-stable-mirror@lists.linaro.org
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Darrick J. Wong -
Yang Xu