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Kees Cook 7660a6fddc mm: allow slab_nomerge to be set at build time 
Some hardened environments want to build kernels with slab_nomerge
already set (so that they do not depend on remembering to set the kernel
command line option).  This is desired to reduce the risk of kernel heap
overflows being able to overwrite objects from merged caches and changes
the requirements for cache layout control, increasing the difficulty of
these attacks.  By keeping caches unmerged, these kinds of exploits can
usually only damage objects in the same cache (though the risk to
metadata exploitation is unchanged).

Link: http://lkml.kernel.org/r/20170620230911.GA25238@beast
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: David Windsor <dave@nullcore.net>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: David Windsor <dave@nullcore.net>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2017-07-06 16:24:31 -07:00
..
Kconfig mm: allow slab_nomerge to be set at build time 2017-07-06 16:24:31 -07:00
Makefile kbuild: allow archs to select link dead code/data elimination 2016-09-09 10:47:00 +02:00
calibrate.c kernel: add calibration_delay_done() 2014-06-16 12:47:39 -06:00
do_mounts.c init: reduce rootwait polling interval time to 5ms 2016-12-12 18:55:10 -08:00
do_mounts.h initramfs: use vfs_stat/lstat directly 2017-05-08 17:15:12 -07:00
do_mounts_initrd.c init/do_mounts: initrd_load() can be boolean 2016-01-20 17:09:18 -08:00
do_mounts_md.c init: disable sparse checking of the mount.o source files 2012-05-31 17:49:27 -07:00
do_mounts_rd.c init: use pr_cont() when displaying rotator during ramdisk loading. 2016-11-24 09:32:20 -08:00
init_task.c sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h> 2017-03-02 08:42:38 +01:00
initramfs.c initramfs: use vfs_stat/lstat directly 2017-05-08 17:15:12 -07:00
main.c sched/core: Enable might_sleep() and smp_processor_id() checks early 2017-05-23 10:01:38 +02:00
noinitramfs.c init: mark __user address space on string literals 2010-10-26 16:52:15 -07:00
version.c locking/atomic, kref: Add KREF_INIT() 2017-01-14 11:37:18 +01:00