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 v12 [https://lkml.org/lkml/2018/1/30/397] - fixed Kconfig dependency for pmalloc-test - fixed warning for size_t treated as %ul on i386 - moved to SPDX license reference - rewrote pmalloc docs Igor Stoppa (6): genalloc: track beginning of allocations genalloc: selftest struct page: add field for vm_struct Protectable Memory Pmalloc: self-test Documentation for Pmalloc Documentation/core-api/pmalloc.rst | 114 ++++++++ include/linux/genalloc-selftest.h | 30 +++ include/linux/genalloc.h | 7 +- include/linux/mm_types.h | 1 + include/linux/pmalloc.h | 211 +++++++++++++++ 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 | 9 + mm/Makefile | 2 + mm/pmalloc-selftest.c | 61 +++++ mm/pmalloc-selftest.h | 26 ++ mm/pmalloc.c | 514 +++++++++++++++++++++++++++++++++++++ mm/usercopy.c | 25 +- mm/vmalloc.c | 18 +- 18 files changed, 1742 insertions(+), 141 deletions(-) create mode 100644 Documentation/core-api/pmalloc.rst 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
