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From: Stas Sergeev <stsp2@yandex.ru>
To: linux-kernel@vger.kernel.org
Cc: Stas Sergeev <stsp2@yandex.ru>,
	Stefan Metzmacher <metze@samba.org>,
	Eric Biederman <ebiederm@xmission.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andy Lutomirski <luto@kernel.org>,
	Christian Brauner <brauner@kernel.org>,
	Jan Kara <jack@suse.cz>,
	Jeff Layton <jlayton@kernel.org>,
	Chuck Lever <chuck.lever@oracle.com>,
	Alexander Aring <alex.aring@gmail.com>,
	linux-fsdevel@vger.kernel.org,
	Paolo Bonzini <pbonzini@redhat.com>,
	=?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Subject: [PATCH v2 0/2] implement OA2_INHERIT_CRED flag for openat2()
Date: Tue, 23 Apr 2024 13:48:22 +0300
Message-ID: <20240423104824.10464-1-stsp2@yandex.ru>
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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@samba.org>

CC: Stefan Metzmacher <metze@samba.org>
CC: Eric Biederman <ebiederm@xmission.com>
CC: Alexander Viro <viro@zeniv.linux.org.uk>
CC: Andy Lutomirski <luto@kernel.org>
CC: Christian Brauner <brauner@kernel.org>
CC: Jan Kara <jack@suse.cz>
CC: Jeff Layton <jlayton@kernel.org>
CC: Chuck Lever <chuck.lever@oracle.com>
CC: Alexander Aring <alex.aring@gmail.com>
CC: linux-fsdevel@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Christian Göttsche <cgzones@googlemail.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