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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240423104002.9012-1-stsp2@yandex.ru>
Date: Tue, 23 Apr 2024 13:40:00 +0300
From: Stas Sergeev <stsp2@...dex.ru>
To: linux-kernel@...r.kernel.org
Cc: Stas Sergeev <stsp2@...dex.ru>
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>

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