From: Igor Stoppa <igor.stoppa@huawei.com>
To: keescook@chromium.org, mhocko@kernel.org, jmorris@namei.org,
labbott@redhat.com
Cc: penguin-kernel@I-love.SAKURA.ne.jp, paul@paul-moore.com,
sds@tycho.nsa.gov, casey@schaufler-ca.com, hch@infradead.org,
linux-security-module@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Igor Stoppa <igor.stoppa@huawei.com>
Subject: [PATCH v7 0/3] ro protection for dynamic data
Date: Mon, 26 Jun 2017 17:41:13 +0300 [thread overview]
Message-ID: <20170626144116.27599-1-igor.stoppa@huawei.com> (raw)
Hi,
please consider for inclusion.
This patch introduces the possibility of protecting memory that has
been allocated dynamically.
The memory is managed in pools: when a pool is made R/O, all the memory
that is part of it, will become R/O.
A R/O pool can be destroyed to recover its memory, but it cannot be
turned back into R/W mode.
This is intentional. This feature is meant for data that doesn't need
further modifications, after initialization.
An example is provided, showing how to turn into a boot-time option the
writable state of the security hooks.
Prior to this patch, it was a compile-time option.
This is made possible, thanks to Tetsuo Handa's rework of the hooks
structure (included in the patchset).
Changes since the v6 version:
- complete rewrite, to use the genalloc library
- added sysfs interface for tracking of active pools
The only question still open is if there should be a possibility for
unprotecting a memory pool in other cases than destruction.
The only cases found for this topic are:
- protecting the LSM header structure between creation and insertion of a
security module that was not built as part of the kernel
(but the module can protect the headers after it has loaded)
- unloading SELinux from RedHat, if the system has booted, but no policy
has been loaded yet - this feature is going away, according to Casey.
Igor Stoppa (2):
Protectable memory support
Make LSM Writable Hooks a command line option
Tetsuo Handa (1):
LSM: Convert security_hook_heads into explicit array of struct
list_head
arch/Kconfig | 1 +
include/linux/lsm_hooks.h | 420 ++++++++++++++++++++---------------------
include/linux/page-flags.h | 2 +
include/linux/pmalloc.h | 111 +++++++++++
include/trace/events/mmflags.h | 1 +
init/main.c | 2 +
lib/Kconfig | 1 +
lib/genalloc.c | 4 +-
mm/Makefile | 1 +
mm/pmalloc.c | 346 +++++++++++++++++++++++++++++++++
mm/usercopy.c | 24 ++-
security/security.c | 49 +++--
12 files changed, 726 insertions(+), 236 deletions(-)
create mode 100644 include/linux/pmalloc.h
create mode 100644 mm/pmalloc.c
--
2.9.3
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next reply other threads:[~2017-06-26 14:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 14:41 Igor Stoppa [this message]
2017-06-26 14:41 ` [PATCH 1/3] Protectable memory support Igor Stoppa
2017-06-27 3:17 ` kbuild test robot
2017-06-27 3:55 ` kbuild test robot
2017-06-26 14:41 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
2017-06-26 14:41 ` [PATCH 3/3] Make LSM Writable Hooks a command line option Igor Stoppa
2017-06-27 5:07 ` kbuild test robot
2017-06-27 6:48 ` kbuild test robot
2017-06-29 2:26 ` 7361ce7529: BUG:sleeping_function_called_from_invalid_context_at_mm/slab.h kernel test robot
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