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linux/arch/x86/mm
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Stephen Smalley ab76f7b4ab x86/mm: Set NX on gap between __ex_table and rodata 
Unused space between the end of __ex_table and the start of
rodata can be left W+x in the kernel page tables.  Extend the
setting of the NX bit to cover this gap by starting from
text_end rather than rodata_start.

  Before:
  ---[ High Kernel Mapping ]---
  0xffffffff80000000-0xffffffff81000000          16M                               pmd
  0xffffffff81000000-0xffffffff81600000           6M     ro         PSE     GLB x  pmd
  0xffffffff81600000-0xffffffff81754000        1360K     ro                 GLB x  pte
  0xffffffff81754000-0xffffffff81800000         688K     RW                 GLB x  pte
  0xffffffff81800000-0xffffffff81a00000           2M     ro         PSE     GLB NX pmd
  0xffffffff81a00000-0xffffffff81b3b000        1260K     ro                 GLB NX pte
  0xffffffff81b3b000-0xffffffff82000000        4884K     RW                 GLB NX pte
  0xffffffff82000000-0xffffffff82200000           2M     RW         PSE     GLB NX pmd
  0xffffffff82200000-0xffffffffa0000000         478M                               pmd

  After:
  ---[ High Kernel Mapping ]---
  0xffffffff80000000-0xffffffff81000000          16M                               pmd
  0xffffffff81000000-0xffffffff81600000           6M     ro         PSE     GLB x  pmd
  0xffffffff81600000-0xffffffff81754000        1360K     ro                 GLB x  pte
  0xffffffff81754000-0xffffffff81800000         688K     RW                 GLB NX pte
  0xffffffff81800000-0xffffffff81a00000           2M     ro         PSE     GLB NX pmd
  0xffffffff81a00000-0xffffffff81b3b000        1260K     ro                 GLB NX pte
  0xffffffff81b3b000-0xffffffff82000000        4884K     RW                 GLB NX pte
  0xffffffff82000000-0xffffffff82200000           2M     RW         PSE     GLB NX pmd
  0xffffffff82200000-0xffffffffa0000000         478M                               pmd

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1443704662-3138-1-git-send-email-sds@tycho.nsa.gov
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-10-02 09:21:06 +02:00
..
kmemcheck x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
amdtopology.c
dump_pagetables.c Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 13:59:34 -08:00
extable.c
fault.c x86/vm86: Clean up vm86.h includes 2015-07-31 13:31:10 +02:00
gup.c mm: convert p[te|md]_numa users to p[te|md]_protnone_numa 2015-02-12 18:54:08 -08:00
highmem_32.c sched/preempt, mm/kmap: Explicitly disable/enable preemption in kmap_atomic_* 2015-05-19 08:39:14 +02:00
hugetlbpage.c mm/hugetlb: pmd_huge() returns true for non-present hugepage 2015-02-11 17:06:01 -08:00
init.c x86/mm/pat: Add comments to cachemode translation tables 2015-08-20 21:26:12 +02:00
init_32.c libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
init_64.c x86/mm: Set NX on gap between __ex_table and rodata 2015-10-02 09:21:06 +02:00
iomap_32.c Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
ioremap.c x86/mm: Fix newly introduced printk format warnings 2015-07-24 16:35:33 +02:00
kasan_init_64.c x86/kasan, mm: Introduce generic kasan_populate_zero_shadow() 2015-08-22 14:54:55 +02:00
kmmio.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
Makefile mm: move memtest under mm 2015-04-14 16:49:06 -07:00
mm_internal.h x86: Enable PAT to use cache mode translation tables 2014-11-16 11:04:26 +01:00
mmap.c x86/mpx: Do not set ->vm_ops on MPX VMAs 2015-07-21 07:57:16 +02:00
mmio-mod.c x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
mpx.c mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff() 2015-09-10 13:29:01 -07:00
numa.c mem-hotplug: handle node hole when initializing numa_meminfo. 2015-09-08 15:35:28 -07:00
numa_32.c x86: Fix the initialization of physnode_map 2014-02-01 22:15:51 -08:00
numa_64.c
numa_emulation.c x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
numa_internal.h
pageattr-test.c x86/mm/pat: Make mm/pageattr[-test].c explicitly non-modular 2015-08-25 09:48:38 +02:00
pageattr.c x86/mm/pat: Make mm/pageattr[-test].c explicitly non-modular 2015-08-25 09:48:38 +02:00
pat.c x86/mm/pat: Extend set_page_memtype() to support Write-Through type 2015-06-07 15:28:59 +02:00
pat_internal.h x86/mm/pat: Convert to pr_*() usage 2015-05-27 14:40:59 +02:00
pat_rbtree.c x86/mm/pat: Convert to pr_*() usage 2015-05-27 14:40:59 +02:00
pf_in.c
pf_in.h
pgtable.c x86/mm/mtrr: Enhance MTRR checks in kernel mapping helpers 2015-05-27 14:40:58 +02:00
pgtable_32.c x86: Remove set_pmd_pfn 2014-09-01 10:15:31 +02:00
physaddr.c
physaddr.h
setup_nx.c x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
srat.c x86/mm/srat: Print non-volatile flag in SRAT 2015-09-02 09:33:25 +02:00
testmmiotrace.c
tlb.c x86, mm: trace when an IPI is about to be sent 2015-09-04 16:54:41 -07:00