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authorCyrill Gorcunov <gorcunov@gmail.com>2014-08-06 16:07:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:20 -0700
commit9aed8614af5a05cdaa32a0b78b0f1a424754a958 (patch)
treee2e790fb6b86e118757b4c9124323b5fcaf6c102 /mm
parentf0093ede9b726ccb1876d43574f5b45c79940aca (diff)
downloadlinux-9aed8614af5a05cdaa32a0b78b0f1a424754a958.tar.gz
mm/memory.c: don't forget to set softdirty on file mapped fault
Otherwise we may not notice that pte was softdirty because pte_mksoft_dirty helper _returns_ new pte but doesn't modify the argument. In case if page fault happend on dirty filemapping the newly created pte may loose softdirty bit thus if a userspace program is tracking memory changes with help of a memory tracker (CONFIG_MEM_SOFT_DIRTY) it might miss modification of a memory page (which in worts case may lead to data inconsistency). Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 01d0289f30a7..7e131325bdf8 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2744,7 +2744,7 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
if (write)
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
else if (pte_file(*pte) && pte_file_soft_dirty(*pte))
- pte_mksoft_dirty(entry);
+ entry = pte_mksoft_dirty(entry);
if (anon) {
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
page_add_new_anon_rmap(page, vma, address);