Subject: [RFC v4 PATCH 0/5] NOT FOR MERGE - ro protection for dynamic data
This patchset 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 and 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 rewor of the hooks
structure (included in the patchset).
Notes:
* I have performed some preliminary test on qemu x86_64 and the changes
seem to hold, but more extensive testing is required.
* I'll be AFK for about a week, so I preferred to share this version, even
if not thoroughly tested, in the hope to get preliminary comments, but
it is rough around the edges.
Igor Stoppa (4):
Protectable Memory Allocator
Protectable Memory Allocator - Debug interface
Make LSM Writable Hooks a command line option
NOT FOR MERGE - Protectable Memory Allocator test
Tetsuo Handa (1):
LSM: Convert security_hook_heads into explicit array of struct
list_head
include/linux/lsm_hooks.h | 412 ++++++++++++++++++++---------------------
include/linux/page-flags.h | 2 +
include/linux/pmalloc.h | 20 ++
include/trace/events/mmflags.h | 1 +
init/main.c | 2 +
mm/Kconfig | 11 ++
mm/Makefile | 4 +-
mm/pmalloc.c | 340 ++++++++++++++++++++++++++++++++++
mm/pmalloc_test.c | 172 +++++++++++++++++
mm/usercopy.c | 24 ++-
security/security.c | 58 ++++--
11 files changed, 814 insertions(+), 232 deletions(-)
create mode 100644 include/linux/pmalloc.h
create mode 100644 mm/pmalloc.c
create mode 100644 mm/pmalloc_test.c
--
2.9.3
