Date: Tue, 30 Jan 2018 17:14:40 +0200 From: Igor Stoppa <igor.stoppa@...wei.com> To: <jglisse@...hat.com>, <keescook@...omium.org>, <mhocko@...nel.org>, <labbott@...hat.com>, <hch@...radead.org>, <willy@...radead.org> CC: <cl@...ux.com>, <linux-security-module@...r.kernel.org>, <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>, <kernel-hardening@...ts.openwall.com>, Igor Stoppa <igor.stoppa@...wei.com> Subject: [RFC PATCH v12 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 turned into 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. However the data might need to be released, for example as part of module unloading. To do this, the memory must first be freed, then the pool can be destroyed. An example is provided, in the form of self-testing. Changes since the v11 version: [http://www.openwall.com/lists/kernel-hardening/2018/01/24/4] - restricted access to sysfs entries created (444 -> 400) - more explicit reference to documentation - couple of typos Igor Stoppa (6): genalloc: track beginning of allocations genalloc: selftest struct page: add field for vm_struct Protectable Memory Documentation for Pmalloc Pmalloc: self-test Documentation/core-api/pmalloc.txt | 104 ++++++++ include/linux/genalloc-selftest.h | 30 +++ include/linux/genalloc.h | 5 +- include/linux/mm_types.h | 1 + include/linux/pmalloc.h | 216 ++++++++++++++++ include/linux/vmalloc.h | 1 + init/main.c | 2 + lib/Kconfig | 15 ++ lib/Makefile | 1 + lib/genalloc-selftest.c | 402 +++++++++++++++++++++++++++++ lib/genalloc.c | 444 +++++++++++++++++++++---------- mm/Kconfig | 7 + mm/Makefile | 2 + mm/pmalloc-selftest.c | 65 +++++ mm/pmalloc-selftest.h | 30 +++ mm/pmalloc.c | 516 +++++++++++++++++++++++++++++++++++++ mm/usercopy.c | 25 +- mm/vmalloc.c | 18 +- 18 files changed, 1744 insertions(+), 140 deletions(-) create mode 100644 Documentation/core-api/pmalloc.txt create mode 100644 include/linux/genalloc-selftest.h create mode 100644 include/linux/pmalloc.h create mode 100644 lib/genalloc-selftest.c create mode 100644 mm/pmalloc-selftest.c create mode 100644 mm/pmalloc-selftest.h create mode 100644 mm/pmalloc.c -- 2.9.3
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