linux-kernel - [PATCH v2 0/2] implement OA2_INHERIT

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Message-ID: <20240423104824.10464-1-stsp2@yandex.ru>
Date: Tue, 23 Apr 2024 13:48:22 +0300
From: Stas Sergeev <stsp2@...dex.ru>
To: linux-kernel@...r.kernel.org
Cc: Stas Sergeev <stsp2@...dex.ru>,
	Stefan Metzmacher <metze@...ba.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andy Lutomirski <luto@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Jeff Layton <jlayton@...nel.org>,
	Chuck Lever <chuck.lever@...cle.com>,
	Alexander Aring <alex.aring@...il.com>,
	linux-fsdevel@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christian Göttsche <cgzones@...glemail.com>
Subject: [PATCH v2 0/2] implement OA2_INHERIT_CRED flag for openat2()

This patch-set implements the OA2_INHERIT_CRED flag for openat2() syscall.
It is needed to perform an open operation with the creds that were in
effect when the dir_fd was opened. This allows the process to pre-open
some dirs and switch eUID (and other UIDs/GIDs) to the less-privileged
user, while still retaining the possibility to open/create files within
the pre-opened directory set.

Changes in v2:
- capture full struct cred instead of just fsuid/fsgid.
  Suggested by Stefan Metzmacher <metze@...ba.org>

CC: Stefan Metzmacher <metze@...ba.org>
CC: Eric Biederman <ebiederm@...ssion.com>
CC: Alexander Viro <viro@...iv.linux.org.uk>
CC: Andy Lutomirski <luto@...nel.org>
CC: Christian Brauner <brauner@...nel.org>
CC: Jan Kara <jack@...e.cz>
CC: Jeff Layton <jlayton@...nel.org>
CC: Chuck Lever <chuck.lever@...cle.com>
CC: Alexander Aring <alex.aring@...il.com>
CC: linux-fsdevel@...r.kernel.org
CC: linux-kernel@...r.kernel.org
CC: Paolo Bonzini <pbonzini@...hat.com>
CC: Christian Göttsche <cgzones@...glemail.com>

Stas Sergeev (2):
  fs: reorganize path_openat()
  openat2: add OA2_INHERIT_CRED flag

 fs/internal.h                |  2 +-
 fs/namei.c                   | 52 +++++++++++++++++++++++++++++-------
 fs/open.c                    |  2 +-
 include/linux/fcntl.h        |  2 ++
 include/uapi/linux/openat2.h |  3 +++
 5 files changed, 50 insertions(+), 11 deletions(-)

-- 
2.44.0