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linux/mm
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Dmitriy Monakhov c4ec7b0de4 [PATCH] mm: D-cache aliasing issue in cow_user_page 
--=-=-=

 from mm/memory.c:
  1434  static inline void cow_user_page(struct page *dst, struct page *src, unsigned long va)
  1435  {
  1436          /*
  1437           * If the source page was a PFN mapping, we don't have
  1438           * a "struct page" for it. We do a best-effort copy by
  1439           * just copying from the original user address. If that
  1440           * fails, we just zero-fill it. Live with it.
  1441           */
  1442          if (unlikely(!src)) {
  1443                  void *kaddr = kmap_atomic(dst, KM_USER0);
  1444                  void __user *uaddr = (void __user *)(va & PAGE_MASK);
  1445
  1446                  /*
  1447                   * This really shouldn't fail, because the page is there
  1448                   * in the page tables. But it might just be unreadable,
  1449                   * in which case we just give up and fill the result with
  1450                   * zeroes.
  1451                   */
  1452                  if (__copy_from_user_inatomic(kaddr, uaddr, PAGE_SIZE))
  1453                          memset(kaddr, 0, PAGE_SIZE);
  1454                  kunmap_atomic(kaddr, KM_USER0);
  #### D-cache have to be flushed here.
  #### It seems it is just forgotten.

  1455                  return;
  1456
  1457          }
  1458          copy_user_highpage(dst, src, va);
  #### Ok here. flush_dcache_page() called from this func if arch need it
  1459  }

Following is the patch  fix this issue:

Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-20 10:26:43 -07:00
..
allocpercpu.c [PATCH] Extract the allocpercpu functions from the slab allocator 2006-09-26 08:48:51 -07:00
backing-dev.c [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
bootmem.c [PATCH] bootmem: use MAX_DMA_ADDRESS instead of LOW32LIMIT 2006-09-26 08:48:49 -07:00
bounce.c [PATCH] BLOCK: Separate the bounce buffering code from the highmem code [try #6] 2006-09-30 20:32:11 +02:00
fadvise.c
filemap.c [PATCH] direct-io: sync and invalidate file region when falling back to buffered write 2006-10-20 10:26:35 -07:00
filemap.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
filemap_xip.c
fremap.c [PATCH] paravirt: pte clear not present 2006-10-01 00:39:33 -07:00
highmem.c [PATCH] BLOCK: Separate the bounce buffering code from the highmem code [try #6] 2006-09-30 20:32:11 +02:00
hugetlb.c [PATCH] hugetlb: fix linked list corruption in unmap_hugepage_range() 2006-10-11 11:14:15 -07:00
internal.h [PATCH] mm: VM_BUG_ON 2006-09-26 08:48:44 -07:00
Kconfig Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
madvise.c
Makefile [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
memory.c [PATCH] mm: D-cache aliasing issue in cow_user_page 2006-10-20 10:26:43 -07:00
memory_hotplug.c [PATCH] hot-add-mem x86_64: use CONFIG_MEMORY_HOTPLUG_RESERVE 2006-10-01 00:39:18 -07:00
mempolicy.c [PATCH] Fix do_mbind warning with CONFIG_MIGRATION=n 2006-10-11 11:14:19 -07:00
mempool.c
migrate.c [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
mincore.c
mlock.c
mmap.c Fix VM_MAYEXEC calculation 2006-10-15 14:09:55 -07:00
mmzone.c
mprotect.c [PATCH] paravirt: lazy mmu mode hooks.patch 2006-10-01 00:39:33 -07:00
mremap.c [PATCH] paravirt: lazy mmu mode hooks.patch 2006-10-01 00:39:33 -07:00
msync.c [PATCH] mm: msync() cleanup 2006-09-26 08:48:45 -07:00
nommu.c Spelling fix: "control" instead of "cotrol" 2006-10-03 23:21:02 +02:00
oom_kill.c [PATCH] OOM killer meets userspace headers 2006-10-20 10:26:38 -07:00
page-writeback.c [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
page_alloc.c [PATCH] highest_possible_node_id() linkage fix 2006-10-20 10:26:43 -07:00
page_io.c [PATCH] swsusp: read speedup 2006-09-26 08:48:58 -07:00
pdflush.c
prio_tree.c
readahead.c
rmap.c [PATCH] move rmap BUG_ON outside DEBUG_VM 2006-10-11 11:14:19 -07:00
shmem.c [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
shmem_acl.c [PATCH] Fix typos in mm/shmem_acl.c 2006-10-11 11:14:23 -07:00
slab.c [PATCH] slab: remove wrongly placed BUG_ON 2006-10-07 10:51:14 -07:00
slob.c [PATCH] Make kmem_cache_destroy() return void 2006-09-27 08:26:11 -07:00
sparse.c
swap.c [PATCH] mm/: make functions static 2006-09-26 08:48:45 -07:00
swap_state.c
swapfile.c [PATCH] valid_swaphandles() fix 2006-09-29 09:18:23 -07:00
thrash.c
tiny-shmem.c
truncate.c [PATCH] invalidate: remove_mapping() fix 2006-10-17 08:18:43 -07:00
util.c [PATCH] slab: clean up leak tracking ifdefs a little bit 2006-10-04 07:55:13 -07:00
vmalloc.c [PATCH] vmalloc(): don't pass __GFP_ZERO to slab 2006-10-17 08:18:44 -07:00
vmscan.c [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
vmstat.c Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00