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Tavis Ormandy 462e635e5b install_special_mapping skips security_file_mmap check. 
The install_special_mapping routine (used, for example, to setup the
vdso) skips the security check before insert_vm_struct, allowing a local
attacker to bypass the mmap_min_addr security restriction by limiting
the available pages for special mappings.

bprm_mm_init() also skips the check, and although I don't think this can
be used to bypass any restrictions, I don't see any reason not to have
the security check.

  $ uname -m
  x86_64
  $ cat /proc/sys/vm/mmap_min_addr
  65536
  $ cat install_special_mapping.s
  section .bss
      resb BSS_SIZE
  section .text
      global _start
      _start:
          mov     eax, __NR_pause
          int     0x80
  $ nasm -D__NR_pause=29 -DBSS_SIZE=0xfffed000 -f elf -o install_special_mapping.o install_special_mapping.s
  $ ld -m elf_i386 -Ttext=0x10000 -Tbss=0x11000 -o install_special_mapping install_special_mapping.o
  $ ./install_special_mapping &
  [1] 14303
  $ cat /proc/14303/maps
  0000f000-00010000 r-xp 00000000 00:00 0                                  [vdso]
  00010000-00011000 r-xp 00001000 00:19 2453665                            /home/taviso/install_special_mapping
  00011000-ffffe000 rwxp 00000000 00:00 0                                  [stack]

It's worth noting that Red Hat are shipping with mmap_min_addr set to
4096.

Signed-off-by: Tavis Ormandy <taviso@google.com>
Acked-by: Kees Cook <kees@ubuntu.com>
Acked-by: Robert Swiecki <swiecki@google.com>
[ Changed to not drop the error code - akpm ]
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2010-12-15 12:30:36 -08:00
..
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2010-10-22 17:31:36 -07:00
Kconfig.debug trivial: improve help text for mm debug config options 2009-09-21 15:14:57 +02:00
Makefile percpu: use percpu allocator on UP too 2010-10-02 10:26:05 +03:00
backing-dev.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-10-26 17:58:44 -07:00
bootmem.c x86, memblock: Replace e820_/_early string with memblock_ 2010-08-27 11:13:47 -07:00
bounce.c bounce: call flush_dcache_page() after bounce_copy_vec() 2010-09-09 18:57:25 -07:00
compaction.c mm: compaction: handle active and inactive fairly in too_many_isolated 2010-09-09 18:57:24 -07:00
debug-pagealloc.c generic debug pagealloc 2009-04-01 08:59:13 -07:00
dmapool.c mm: add a might_sleep_if() to dma_pool_alloc() 2010-10-26 16:52:08 -07:00
fadvise.c readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM 2010-03-06 11:26:25 -08:00
failslab.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
filemap.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
filemap_xip.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
fremap.c Avoid pgoff overflow in remap_file_pages 2010-09-25 09:34:58 -07:00
highmem.c mm,x86: fix kmap_atomic_push vs ioremap_32.c 2010-10-27 18:03:05 -07:00
hugetlb.c mm/hugetlb.c: avoid double unlock_page() in hugetlb_fault() 2010-12-02 14:51:14 -08:00
hwpoison-inject.c HWPOISON, hugetlb: support hwpoison injection for hugepage 2010-08-11 09:23:11 +02:00
init-mm.c mm: provide init_mm mm_context initializer 2010-08-09 20:44:54 -07:00
internal.h mm: fix is_mem_section_removable() page_order BUG_ON check 2010-10-26 16:52:11 -07:00
kmemcheck.c kmemcheck: Fix build errors due to missing slab.h 2010-03-30 22:02:32 +09:00
kmemleak-test.c percpu: clean up percpu variable definitions 2009-06-24 15:13:48 +09:00
kmemleak.c kmemleak: Fix typo in the comment 2010-08-08 21:57:23 +01:00
ksm.c ksm: annotate ksm_thread_mutex is no deadlock source 2010-12-02 14:51:15 -08:00
maccess.c MN10300: Save frame pointer in thread_info struct rather than global var 2010-10-27 17:29:01 +01:00
madvise.c HWPOISON: Add a madvise() injector for soft page offlining 2009-12-16 12:20:00 +01:00
memblock.c memblock: Annotate memblock functions with __init_memblock 2010-10-11 16:00:52 -07:00
memcontrol.c cgroups: make swap accounting default behavior configurable 2010-11-25 06:50:45 +09:00
memory-failure.c mem-hotplug: introduce {un}lock_memory_hotplug() 2010-12-02 14:51:15 -08:00
memory.c use clear_page()/copy_page() in favor of memset()/memcpy() on whole pages 2010-10-26 16:52:13 -07:00
memory_hotplug.c mem-hotplug: introduce {un}lock_memory_hotplug() 2010-12-02 14:51:15 -08:00
mempolicy.c mm/mempolicy.c: add rcu read lock to protect pid structure 2010-12-02 14:51:14 -08:00
mempool.c mm: remove broken 'kzalloc' mempool 2009-09-22 07:17:35 -07:00
migrate.c mm: fix error reporting in move_pages() syscall 2010-10-26 16:52:11 -07:00
mincore.c mincore: do nested page table walks 2010-05-25 08:06:58 -07:00
mlock.c mm: Move vma_stack_continue into mm.h 2010-09-09 09:05:06 -07:00
mm_init.c
…
mmap.c install_special_mapping skips security_file_mmap check. 2010-12-15 12:30:36 -08:00
mmu_context.c exit: fix oops in sync_mm_rss 2010-03-24 16:31:21 -07:00
mmu_notifier.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mmzone.c mm: page allocator: calculate a better estimate of NR_FREE_PAGES when memory is low and kswapd is awake 2010-09-09 18:57:25 -07:00
mprotect.c perf_events: Fix perf_counter_mmap() hook in mprotect() 2010-11-09 10:19:38 -08:00
mremap.c mm: remove pte_*map_nested() 2010-10-26 16:52:08 -07:00
msync.c sanitize vfs_fsync calling conventions 2010-05-21 18:31:21 -04:00
nommu.c nommu: yield CPU while disposing VM 2010-11-25 06:50:38 +09:00
oom_kill.c oom: kill all threads sharing oom killed task's mm 2010-10-26 16:52:05 -07:00
page-writeback.c writeback: remove the internal 5% low bound on dirty_ratio 2010-10-26 16:52:08 -07:00
page_alloc.c PM / Hibernate: Fix memory corruption related to swap 2010-12-06 23:52:08 +01:00
page_cgroup.c kmemleak: Annotate false positive in init_section_page_cgroup() 2010-07-19 11:54:14 +01:00
page_io.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
page_isolation.c mm: page_isolation: codeclean fix comment and rm unneeded val init 2010-10-26 16:52:11 -07:00
pagewalk.c mm: remove call to find_vma in pagewalk for non-hugetlbfs 2010-11-25 06:50:46 +09:00
percpu-km.c percpu: clear memory allocated with the km allocator 2010-10-02 10:28:42 +03:00
percpu-vm.c percpu: move vmalloc based chunk management into percpu-vm.c 2010-05-01 08:30:50 +02:00
percpu.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
prio_tree.c
…
quicklist.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
readahead.c readahead.c: fix comment 2010-05-25 08:07:00 -07:00
rmap.c rmap: make anon_vma_chain_free() static 2010-10-26 16:52:10 -07:00
shmem.c convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
slab.c replace nested max/min macros with {max,min}3 macro 2010-10-26 16:52:12 -07:00
slob.c slob: fix gfp flags for order-0 page allocations 2010-10-02 10:24:28 +03:00
slub.c slub: Fix a crash during slabinfo -v 2010-12-04 09:53:49 +02:00
sparse-vmemmap.c x86: Use memblock to replace early_res 2010-08-27 11:12:29 -07:00
sparse.c sparsemem: on no vmemmap path put mem_map on node high too 2010-05-25 08:06:56 -07:00
swap.c fuse: use release_pages() 2010-10-27 18:03:17 -07:00
swap_state.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
swapfile.c /proc/swaps: support polling 2010-10-26 16:52:11 -07:00
thrash.c mm: pass mm to grab_swap_token 2009-06-23 12:50:05 -07:00
truncate.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
util.c export __get_user_pages_fast() function 2010-10-24 10:51:24 +02:00
vmalloc.c vmalloc: eagerly clear ptes on vunmap 2010-12-02 14:51:15 -08:00
vmscan.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
vmstat.c vmstat: fix dirty threshold ordering 2010-12-02 14:51:14 -08:00