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Alan Cox 731572d39f nfsd: fix vm overcommit crash 
Junjiro R.  Okajima reported a problem where knfsd crashes if you are
using it to export shmemfs objects and run strict overcommit.  In this
situation the current->mm based modifier to the overcommit goes through a
NULL pointer.

We could simply check for NULL and skip the modifier but we've caught
other real bugs in the past from mm being NULL here - cases where we did
need a valid mm set up (eg the exec bug about a year ago).

To preserve the checks and get the logic we want shuffle the checking
around and add a new helper to the vm_ security wrappers

Also fix a current->mm reference in nommu that should use the passed mm

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix build]
Reported-by: Junjiro R. Okajima <hooanon05@yahoo.co.jp>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-30 11:38:47 -07:00
..
allocpercpu.c mm/allocpercpu.c: make 4 functions static 2008-07-26 12:00:12 -07:00
backing-dev.c mm: bdi: fix race in bdi_class device creation 2008-05-20 13:31:53 -07:00
bootmem.c misc: replace __FUNCTION__ with __func__ 2008-10-16 11:21:30 -07:00
bounce.c highmem: use bio_has_data() in the bounce path 2008-10-09 08:56:01 +02:00
dmapool.c dmapool: enable debugging for CONFIG_SLUB_DEBUG_ON too 2008-04-28 08:58:20 -07:00
fadvise.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
filemap.c fs: remove prepare_write/commit_write 2008-10-30 11:38:45 -07:00
filemap_xip.c mm: xip/ext2 fix block allocation race 2008-08-20 15:40:32 -07:00
fremap.c mmap: handle mlocked pages during map, remap, unmap 2008-10-20 08:52:31 -07:00
highmem.c x86, pat: avoid highmem cache attribute aliasing 2008-08-15 17:22:57 +02:00
hugetlb.c proc: switch /proc/meminfo to seq_file 2008-10-23 13:52:40 +04:00
internal.h mlock: count attempts to free mlocked page 2008-10-20 08:52:31 -07:00
Kconfig Unevictable LRU Infrastructure 2008-10-20 08:50:26 -07:00
maccess.c kgdb: fix optional arch functions and probe_kernel_* 2008-04-17 20:05:39 +02:00
madvise.c madvise: update function comment of madvise_dontneed 2008-07-30 09:41:45 -07:00
Makefile memcg: allocate all page_cgroup at boot 2008-10-20 08:52:39 -07:00
memcontrol.c memcg: fix page_cgroup allocation 2008-10-23 08:55:02 -07:00
memory.c mm: remove duplicated #include's 2008-10-20 16:17:42 -07:00
memory_hotplug.c memory hotplug: release memory regions in PAGES_PER_SECTION chunks 2008-10-20 08:52:32 -07:00
mempolicy.c Unevictable LRU Infrastructure 2008-10-20 08:50:26 -07:00
mempool.c
migrate.c memcg: make page->mapping NULL before uncharge 2008-10-20 08:52:38 -07:00
mincore.c mm: remove nopage 2008-04-28 08:58:18 -07:00
mlock.c mlock: make mlock error return Posixly Correct 2008-10-20 08:52:31 -07:00
mm_init.c mm: mminit_loglevel cannot be __meminitdata anymore 2008-08-20 15:40:30 -07:00
mmap.c nfsd: fix vm overcommit crash 2008-10-30 11:38:47 -07:00
mmu_notifier.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
mmzone.c mm: mark the correct zone as full when scanning zonelists 2008-09-13 14:41:52 -07:00
mprotect.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
mremap.c mmap: handle mlocked pages during map, remap, unmap 2008-10-20 08:52:31 -07:00
msync.c
nommu.c nfsd: fix vm overcommit crash 2008-10-30 11:38:47 -07:00
oom_kill.c security: Fix setting of PF_SUPERPRIV by __capable() 2008-08-14 22:59:43 +10:00
page-writeback.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
page_alloc.c memcg: allocate all page_cgroup at boot 2008-10-20 08:52:39 -07:00
page_cgroup.c memcg: fix page_cgroup allocation 2008-10-23 08:55:02 -07:00
page_io.c
page_isolation.c memory hotplug: missing zone->lock in test_pages_isolated() 2008-10-02 15:53:13 -07:00
pagewalk.c pagemap: pass mm into pagewalkers 2008-06-12 18:05:41 -07:00
pdflush.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
prio_tree.c
quicklist.c mm: size of quicklists shouldn't be proportional to the number of CPUs 2008-09-02 19:21:38 -07:00
readahead.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
rmap.c make mm/rmap.c:anon_vma_cachep static 2008-10-20 08:52:40 -07:00
shmem.c nfsd: fix vm overcommit crash 2008-10-30 11:38:47 -07:00
shmem_acl.c [PATCH] sanitize ->permission() prototype 2008-07-26 20:53:14 -04:00
slab.c proc: move /proc/slabinfo boilerplate to mm/slub.c, mm/slab.c 2008-10-23 15:20:06 +04:00
slob.c SLOB: fix bogus ksize calculation fix 2008-10-09 12:18:27 -07:00
slub.c proc: move /proc/slabinfo boilerplate to mm/slub.c, mm/slab.c 2008-10-23 15:20:06 +04:00
sparse-vmemmap.c Christoph has moved 2008-07-04 10:40:04 -07:00
sparse.c mm/sparse.c: removed duplicated include 2008-08-12 16:07:30 -07:00
swap.c swap: cull unevictable pages in fault path 2008-10-20 08:52:31 -07:00
swap_state.c mm: pagecache insertion fewer atomics 2008-10-20 08:52:31 -07:00
swapfile.c mm: page lock use lock bitops 2008-10-20 08:52:32 -07:00
thrash.c
tiny-shmem.c Export tiny shmem_file_setup for DRM-GEM 2008-10-20 16:17:42 -07:00
truncate.c mmap: handle mlocked pages during map, remap, unmap 2008-10-20 08:52:31 -07:00
util.c mm: Make generic weak get_user_pages_fast and EXPORT_GPL it 2008-08-12 17:52:53 +10:00
vmalloc.c mm: fix kernel-doc function notation 2008-10-30 11:38:46 -07:00
vmscan.c mm: unlockless reclaim 2008-10-20 08:52:32 -07:00
vmstat.c proc: move /proc/zoneinfo boilerplate to mm/vmstat.c 2008-10-23 17:35:04 +04:00