Hugh Dickins de51257aa3 mm: fix ia64 crash when gcore reads gate area ...

Debian's ia64 autobuilders have been seeing kernel freeze or reboot
when running the gdb testsuite (Debian bug 588574): dannf bisected to
2.6.32 62eede62dafb4a6633eae7ffbeb34c60dba5e7b1 "mm: ZERO_PAGE without
PTE_SPECIAL"; and reproduced it with gdb's gcore on a simple target.

I'd missed updating the gate_vma handling in __get_user_pages(): that
happens to use vm_normal_page() (nowadays failing on the zero page),
yet reported success even when it failed to get a page - boom when
access_process_vm() tried to copy that to its intermediate buffer.

Fix this, resisting cleanups: in particular, leave it for now reporting
success when not asked to get any pages - very probably safe to change,
but let's not risk it without testing exposure.

Why did ia64 crash with 16kB pages, but succeed with 64kB pages?
Because setup_gate() pads each 64kB of its gate area with zero pages.

Reported-by: Andreas Barth <aba@not.so.argh.org>
Bisected-by: dann frazier <dannf@debian.org>
Signed-off-by: Hugh Dickins <hughd@google.com>
Tested-by: dann frazier <dannf@dannf.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2010-07-30 18:56:09 -07:00

..

backing-dev.c

writeback: simplify the write back thread queue

2010-07-06 08:59:53 +02:00

bootmem.c

x86,nobootmem: make alloc_bootmem_node fall back to other node when 32bit numa is used

2010-07-20 16:25:40 -07:00

bounce.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

compaction.c

mm: compaction: add a tunable that decides when memory should be compacted and when it should be reclaimed

2010-05-25 08:06:59 -07:00

debug-pagealloc.c

generic debug pagealloc

2009-04-01 08:59:13 -07:00

dmapool.c

dmapools: protect page_list walk in show_pools()

2009-06-30 18:56:00 -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_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

filemap.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

2010-05-30 09:16:14 -07:00

fremap.c

mm: clean up mm_counter

2010-03-06 11:26:23 -08:00

highmem.c

highmem: remove unneeded #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT for debug_kmap_atomic()

2010-05-25 08:07:01 -07:00

hugetlb.c

cpuset,mm: fix no node to alloc memory when changing cpuset's mems

2010-05-25 08:06:57 -07:00

hwpoison-inject.c

HWPOISON: Don't do early filtering if filter is disabled

2009-12-16 12:20:01 +01:00

init-mm.c

mm: consolidate init_mm definition

2009-06-16 19:47:28 -07:00

internal.h

HWPOISON: add an interface to switch off/on all the page filters

2009-12-16 12:19:59 +01:00

Kconfig

lmb: rename to memblock

2010-07-14 17:14:00 +10:00

Kconfig.debug

trivial: improve help text for mm debug config options

2009-09-21 15:14:57 +02:00

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

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

ksm.c

mm: migration: share the anon_vma ref counts between KSM and page migration

2010-05-25 08:06:58 -07:00

maccess.c

maccess,probe_kernel: Allow arch specific override probe_kernel_(read|write)

2010-01-07 11:58:36 -06:00

madvise.c

HWPOISON: Add a madvise() injector for soft page offlining

2009-12-16 12:20:00 +01:00

Makefile

lmb: rename to memblock

2010-07-14 17:14:00 +10:00

memblock.c

lmb: rename to memblock

2010-07-14 17:14:00 +10:00

memcontrol.c

memcg: fix wake up in oom wait queue

2010-06-29 15:29:30 -07:00

memory_hotplug.c

mem-hotplug: fix potential race while building zonelist for new populated zone

2010-05-25 08:07:02 -07:00

memory-failure.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

memory.c

mm: fix ia64 crash when gcore reads gate area

2010-07-30 18:56:09 -07:00

mempolicy.c

mempolicy: fix dangling reference to tmpfs superblock mpol

2010-06-29 15:29:31 -07:00

mempool.c

mm: remove broken 'kzalloc' mempool

2009-09-22 07:17:35 -07:00

migrate.c

memcg: fix mis-accounting of file mapped racy with migration

2010-05-27 09:12:44 -07:00

mincore.c

mincore: do nested page table walks

2010-05-25 08:06:58 -07:00

mlock.c

x86, perf, bts, mm: Delete the never used BTS-ptrace code

2010-03-26 11:33:55 +01:00

mm_init.c

mm: mminit_loglevel cannot be __meminitdata anymore

2008-08-20 15:40:30 -07:00

mmap.c

mmap: check ->vm_ops before dereferencing

2010-04-27 08:26:51 -07:00

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

[ARM] Double check memmap is actually valid with a memmap has unexpected holes V2

2009-05-18 11:22:24 +01:00

mprotect.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

mremap.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

msync.c

sanitize vfs_fsync calling conventions

2010-05-21 18:31:21 -04:00

nommu.c

nommu: allow private mappings of read-only devices

2010-05-26 08:19:23 -07:00

oom_kill.c

memcg: make oom killer a no-op when no killable task can be found

2010-05-27 09:12:43 -07:00

page_alloc.c

x86,nobootmem: make alloc_bootmem_node fall back to other node when 32bit numa is used

2010-07-20 16:25:40 -07:00

page_cgroup.c

kmemleak: Annotate false positive in init_section_page_cgroup()

2010-07-19 11:54:14 +01:00

page_io.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

page_isolation.c

memory hotplug: fix page_zone() calculation in test_pages_isolated()

2008-11-06 15:41:19 -08:00

page-writeback.c

writeback: remove writeback_inodes_wbc

2010-07-06 08:54:03 +02:00

pagewalk.c

pagemap: fix pfn calculation for hugepage

2010-04-07 08:38:04 -07:00

percpu_up.c

percpu: don't implicitly include slab.h from percpu.h

2010-03-30 22:02:32 +09:00

percpu-km.c

percpu: implement kernel memory based chunk allocation

2010-05-01 08:30:50 +02:00

percpu-vm.c

percpu: move vmalloc based chunk management into percpu-vm.c

2010-05-01 08:30:50 +02:00

percpu.c

percpu: fix first chunk match in per_cpu_ptr_to_phys()

2010-06-18 15:07:23 +02:00

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

mm: migration: avoid race between shift_arg_pages() and rmap_walk() during migration by not migrating temporary stacks

2010-05-25 08:06:59 -07:00

shmem.c

fix truncate inode time modification breakage

2010-06-04 17:16:30 -04:00

slab.c

numa: slab: use numa_mem_id() for slab local memory node

2010-05-27 09:12:57 -07:00

slob.c

mm: Move ARCH_SLAB_MINALIGN and ARCH_KMALLOC_MINALIGN to <linux/slob_def.h>

2010-05-19 22:03:13 +03:00

slub.c

Merge branch 'slub/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6

2010-05-30 12:46:17 -07:00

sparse-vmemmap.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

sparse.c

sparsemem: on no vmemmap path put mem_map on node high too

2010-05-25 08:06:56 -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

swap.c

mm: export lru_cache_add_*() to modules

2010-05-25 15:06:06 +02:00

swapfile.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6

2010-05-21 15:26:46 -07:00

thrash.c

mm: pass mm to grab_swap_token

2009-06-23 12:50:05 -07:00

truncate.c

fs: introduce new truncate sequence

2010-05-27 22:15:33 -04:00

util.c

slab: Generify kernel pointer validation

2010-04-09 10:09:50 -07:00

vmalloc.c

mm: purge fragmented percpu vmap blocks

2010-02-02 12:50:47 -08:00

vmscan.c

mm/vmscan.c: fix mapping use after free

2010-07-20 16:25:40 -07:00

vmstat.c

mm: compaction: direct compact when a high-order allocation fails

2010-05-25 08:06:59 -07:00