Kirill A. Shutemov ee53664bda mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support ... Sasha Levin found a NULL pointer dereference that is due to a missing page table lock, which in turn is due to the pmd entry in question being a transparent huge-table entry. The code - introduced in commit 1998cc0489 ("mm: make madvise(MADV_WILLNEED) support swap file prefetch") - correctly checks for this situation using pmd_none_or_trans_huge_or_clear_bad(), but it turns out that that function doesn't work correctly. pmd_none_or_trans_huge_or_clear_bad() expected that pmd_bad() would trigger if the transparent hugepage bit was set, but it doesn't do that if pmd_numa() is also set. Note that the NUMA bit only gets set on real NUMA machines, so people trying to reproduce this on most normal development systems would never actually trigger this. Fix it by removing the very subtle (and subtly incorrect) expectation, and instead just checking pmd_trans_huge() explicitly. Reported-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Andrea Arcangeli <aarcange@redhat.com> [ Additionally remove the now stale test for pmd_trans_huge() inside the pmd_bad() case - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-12-20 12:17:03 -08:00
..
bitops	bitops/find: clarify and extend documentation	2013-11-13 12:09:22 +09:00
4level-fixup.h
atomic64.h
atomic-long.h
atomic.h	asm-generic: move cmpxchg*_local defs to cmpxchg.h	2013-03-13 06:11:05 +01:00
audit_change_attr.h
audit_dir_write.h
audit_read.h
audit_signal.h
audit_write.h
barrier.h	Create asm-generic/barrier.h	2012-03-28 18:30:03 +01:00
bitops.h
bitsperlong.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
bug.h	bug.h: Fix up CONFIG_BUG=n implicit function declarations.	2012-06-25 10:32:49 -07:00
bugs.h
cache.h
cacheflush.h
checksum.h	asm-generic headers: Allow yet more arch overrides in checksum.h	2013-02-11 20:00:33 +05:30
clkdev.h	asm-generic: Add default clkdev.h	2012-10-03 21:33:53 +02:00
cmpxchg-local.h	generic: Use raw local irq variant for generic cmpxchg	2013-02-19 08:43:37 +01:00
cmpxchg.h	asm-generic: move cmpxchg*_local defs to cmpxchg.h	2013-03-13 06:11:05 +01:00
cputime_jiffies.h	cputime: Move default nsecs_to_cputime() to jiffies based cputime file	2013-01-27 19:23:25 +01:00
cputime_nsecs.h	cputime_nsecs: use math64.h for nsec resolution conversion helpers	2013-04-26 18:58:12 +02:00
cputime.h	cputime: Generic on-demand virtual cputime accounting	2013-01-27 19:23:27 +01:00
current.h
delay.h
device.h
div64.h
dma-coherent.h	common: dma-mapping: add support for generic dma_mmap_* calls	2012-07-30 12:25:46 +02:00
dma-mapping-broken.h	asm-generic/dma-mapping-broken.h: Provide dma_alloc_attrs()/dma_free_attrs()	2012-12-25 20:14:54 +01:00
dma-mapping-common.h	common: dma-mapping: introduce dma_get_sgtable() function	2012-07-30 12:25:46 +02:00
dma.h
emergency-restart.h
exec.h	Split arch_align_stack() out from asm-generic/system.h	2012-03-28 18:30:03 +01:00
fb.h
ftrace.h
futex.h
getorder.h
gpio.h	GPIO bulk changes for the v3.13 development cycle	2013-11-12 15:50:46 +09:00
hardirq.h
hugetlb.h	mm: Fix generic hugetlb pte check return type.	2013-10-02 20:02:35 -04:00
hw_irq.h
ide_iops.h
int-l64.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
int-ll64.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
io-64-nonatomic-hi-lo.h
io-64-nonatomic-lo-hi.h
io.h	kernel: Fix s390 absolute memory access for /dev/mem	2013-05-22 09:45:57 +02:00
ioctl.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
iomap.h
irq_regs.h
irq.h
irqflags.h
Kbuild.asm	UAPI: Set up uapi/asm/Kbuild.asm	2012-10-02 18:01:56 +01:00
kdebug.h
kmap_types.h	asm-generic: remove km_type definitions	2012-07-24 15:27:30 +08:00
kvm_para.h	KVM: add kvm_para_available to asm-generic/kvm_para.h	2013-06-05 13:21:29 +03:00
libata-portmap.h
linkage.h
local64.h
local.h
memory_model.h	__page_to_pfn: Fix typo in comment	2013-10-14 15:28:29 +02:00
mm_hooks.h
mmu_context.h
mmu.h	asm-generic/mmu.h: Add support for FDPIC	2012-12-09 23:14:14 +01:00
module.h	Make most arch asm/module.h files use asm-generic/module.h	2012-09-28 14:31:03 +09:30
mutex-dec.h	arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not	2013-06-26 12:10:55 +02:00
mutex-null.h	arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not	2013-06-26 12:10:55 +02:00
mutex-xchg.h	arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not	2013-06-26 12:10:55 +02:00
mutex.h
page.h
param.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
parport.h	include: remove __dev* attributes.	2013-01-03 15:57:16 -08:00
pci_iomap.h
pci-bridge.h	PCI: work around Stratus ftServer broken PCIe hierarchy	2012-04-30 15:21:02 -06:00
pci-dma-compat.h
pci.h
percpu.h
pgalloc.h
pgtable-nopmd.h
pgtable-nopud.h
pgtable.h	mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support	2013-12-20 12:17:03 -08:00
preempt.h	sched: Remove PREEMPT_NEED_RESCHED from generic code	2013-12-11 15:52:32 +01:00
ptrace.h
resource.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
rtc.h
rwsem.h
scatterlist.h
sections.h	vmlinux.lds: add comments for global variables and clean up useless declarations	2013-07-03 16:07:34 -07:00
segment.h
serial.h
siginfo.h	constify copy_siginfo_to_user{,32}()	2013-11-09 00:16:29 -05:00
signal.h	unify default ptrace_signal_deliver	2012-11-29 00:01:23 -05:00
simd.h	crypto: create generic version of ablk_helper	2013-09-24 06:02:24 +10:00
sizes.h	ARM: 7430/1: sizes.h: move from asm-generic to <linux/sizes.h>	2012-06-28 17:14:34 +01:00
spinlock.h
statfs.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
string.h
switch_to.h	Split the switch_to() wrapper out of asm-generic/system.h	2012-03-28 18:30:03 +01:00
syscall.h	asm/syscall.h: add syscall_get_arch	2012-04-14 11:13:19 +10:00
syscalls.h	burying unused conditionals	2013-02-14 09:21:15 -05:00
termios-base.h
termios.h	UAPI: (Scripted) Disintegrate include/asm-generic	2012-10-04 18:20:15 +01:00
timex.h
tlb.h	Fix TLB gather virtual address range invalidation corner cases	2013-08-16 08:52:46 -07:00
tlbflush.h
topology.h
trace_clock.h	tracing,x86: Add a TSC trace_clock	2012-11-13 15:48:27 -05:00
uaccess-unaligned.h
uaccess.h	asm-generic: uaccess s/might_sleep/might_fault/	2013-05-28 09:41:05 +02:00
unaligned.h
unistd.h	We get rid of the general module prefix confusion with a binary config option,	2013-05-05 10:58:06 -07:00
user.h
vga.h
vmlinux.lds.h	kernel: add support for init_array constructors	2013-10-17 15:05:17 +10:30
vtime.h	include/asm-generic/vtime.h: avoid zero-length file	2013-09-30 14:31:02 -07:00
word-at-a-time.h	word-at-a-time: provide generic big-endian zero_bytemask implementation	2013-12-12 10:39:01 -08:00
xor.h	asm-generic: xor: mark static functions as __maybe_unused	2012-10-03 21:21:06 +02:00