Date: Tue, 27 Mar 2018 18:37:36 +0300 From: Igor Stoppa <igor.stoppa@...wei.com> To: <willy@...radead.org>, <keescook@...omium.org>, <mhocko@...nel.org> CC: <david@...morbit.com>, <rppt@...ux.vnet.ibm.com>, <labbott@...hat.com>, <linux-security-module@...r.kernel.org>, <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>, <kernel-hardening@...ts.openwall.com>, <igor.stoppa@...il.com>, Igor Stoppa <igor.stoppa@...wei.com> Subject: [RFC PATCH v21 0/6] mm: security: ro protection for dynamic data This patch-set introduces the possibility of protecting memory that has been allocated dynamically. The memory is managed in pools: when a memory pool is protected, all the memory that is currently part of it, will become R/O. A R/O pool can be expanded (adding more protectable memory). It can also 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. However the data might need to be released, for example as part of module unloading. The pool, therefore, can be destroyed. An example is provided, in the form of self-testing. Changes since v20: [http://www.openwall.com/lists/kernel-hardening/2018/03/27/2] * removed the align_order parameter from allocation functions * improved documentation with more explanation * fixed lkdt test * reworked the destroy function, removing a possible race with use-after-free code. Igor Stoppa (6): struct page: add field for vm_struct vmalloc: rename llist field in vmap_area Protectable Memory Pmalloc selftest lkdtm: crash on overwriting protected pmalloc var Documentation for Pmalloc Documentation/core-api/index.rst | 1 + Documentation/core-api/pmalloc.rst | 107 +++++++++++++++ drivers/misc/lkdtm.h | 1 + drivers/misc/lkdtm_core.c | 3 + drivers/misc/lkdtm_perms.c | 25 ++++ include/linux/mm_types.h | 1 + include/linux/pmalloc.h | 166 +++++++++++++++++++++++ include/linux/test_pmalloc.h | 24 ++++ include/linux/vmalloc.h | 5 +- init/main.c | 2 + mm/Kconfig | 16 +++ mm/Makefile | 2 + mm/pmalloc.c | 264 +++++++++++++++++++++++++++++++++++++ mm/test_pmalloc.c | 136 +++++++++++++++++++ mm/usercopy.c | 33 +++++ mm/vmalloc.c | 10 +- 16 files changed, 791 insertions(+), 5 deletions(-) create mode 100644 Documentation/core-api/pmalloc.rst create mode 100644 include/linux/pmalloc.h create mode 100644 include/linux/test_pmalloc.h create mode 100644 mm/pmalloc.c create mode 100644 mm/test_pmalloc.c -- 2.14.1
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