linux-kernel - [GIT PULL] ucounts: Count rlimits in each user namespace

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Date:   Mon, 28 Jun 2021 17:35:22 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux.dev>
Subject: [GIT PULL]  ucounts: Count rlimits in each user namespace


Linus,

Please pull the for-linus branch from the git tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-linus

  HEAD: 5e6b8a50a7cec5686ee2c4bda1d49899c79a7eae cred: add missing return error code when set_cred_ucounts() failed

This is the work mainly by Alexey Gladkov to limit rlimits to the
rlimits of the user that created a user namespace, and to allow users to
have stricter limits on the resources created within a user namespace.

There is a more detailed changelog from Alexey in the merge commit
9b624988221b ("ucounts: Count rlimits in each user namespace")

---

Alexey Gladkov (9):
      Increase size of ucounts to atomic_long_t
      Add a reference to ucounts for each cred
      Use atomic_t for ucounts reference counting
      Reimplement RLIMIT_NPROC on top of ucounts
      Reimplement RLIMIT_MSGQUEUE on top of ucounts
      Reimplement RLIMIT_SIGPENDING on top of ucounts
      Reimplement RLIMIT_MEMLOCK on top of ucounts
      kselftests: Add test to check for rlimit changes in different user namespaces
      ucounts: Set ucount_max to the largest positive value the type can hold

Eric W. Biederman (2):
      ucounts: Count rlimits in each user namespace
      ucounts: Silence warning in dec_rlimit_ucounts

Yang Yingliang (1):
      cred: add missing return error code when set_cred_ucounts() failed

 fs/exec.c                                          |   6 +-
 fs/hugetlbfs/inode.c                               |  16 +-
 fs/proc/array.c                                    |   2 +-
 include/linux/cred.h                               |   4 +
 include/linux/hugetlb.h                            |   4 +-
 include/linux/mm.h                                 |   4 +-
 include/linux/sched/user.h                         |   7 -
 include/linux/shmem_fs.h                           |   2 +-
 include/linux/signal_types.h                       |   4 +-
 include/linux/user_namespace.h                     |  31 +++-
 ipc/mqueue.c                                       |  40 ++---
 ipc/shm.c                                          |  26 ++--
 kernel/cred.c                                      |  51 ++++++-
 kernel/exit.c                                      |   2 +-
 kernel/fork.c                                      |  18 ++-
 kernel/signal.c                                    |  25 ++--
 kernel/sys.c                                       |  14 +-
 kernel/ucount.c                                    | 116 +++++++++++----
 kernel/user.c                                      |   3 -
 kernel/user_namespace.c                            |   9 +-
 mm/memfd.c                                         |   4 +-
 mm/mlock.c                                         |  22 ++-
 mm/mmap.c                                          |   4 +-
 mm/shmem.c                                         |  10 +-
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/rlimits/.gitignore         |   2 +
 tools/testing/selftests/rlimits/Makefile           |   6 +
 tools/testing/selftests/rlimits/config             |   1 +
 .../testing/selftests/rlimits/rlimits-per-userns.c | 161 +++++++++++++++++++++
 29 files changed, 468 insertions(+), 127 deletions(-)