Subject: + mm-replace-remap_file_pages-syscall-with-emulation-fix-3.patch added to -mm tree
To: sasha.levin@xxxxxxxxxx,hughd@xxxxxxxxxx,kirill.shutemov@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 15 May 2014 15:57:27 -0700
The patch titled
Subject: mm: remap_file_pages: grab file ref to prevent race while mmaping
has been added to the -mm tree. Its filename is
mm-replace-remap_file_pages-syscall-with-emulation-fix-3.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-replace-remap_file_pages-syscall-with-emulation-fix-3.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-replace-remap_file_pages-syscall-with-emulation-fix-3.patch
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------------------------------------------------------
From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Subject: mm: remap_file_pages: grab file ref to prevent race while mmaping
A file reference should be held while a file is mmaped, otherwise it might
be freed while being used.
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/mmap.c~mm-replace-remap_file_pages-syscall-with-emulation-fix-3 mm/mmap.c
--- a/mm/mmap.c~mm-replace-remap_file_pages-syscall-with-emulation-fix-3
+++ a/mm/mmap.c
@@ -2593,6 +2593,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsign
struct vm_area_struct *vma;
unsigned long populate = 0;
unsigned long ret = -EINVAL;
+ struct file *file;
pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. "
"See Documentation/vm/remap_file_pages.txt.\n",
@@ -2636,8 +2637,10 @@ SYSCALL_DEFINE5(remap_file_pages, unsign
munlock_vma_pages_range(vma, start, start + size);
}
+ file = get_file(vma->vm_file);
ret = do_mmap_pgoff(vma->vm_file, start, size,
prot, flags, pgoff, &populate);
+ fput(file);
out:
up_write(&mm->mmap_sem);
if (populate)
_
Patches currently in -mm which might be from sasha.levin@xxxxxxxxxx are
origin.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v2.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v3.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v3-fix.patch
pagewalk-update-page-table-walker-core-fix-end-address-calculation-in-walk_page_range.patch
pagewalk-update-page-table-walker-core-fix-end-address-calculation-in-walk_page_range-fix.patch
mm-add-pte_present-check-on-existing-hugetlb_entry-callbacks.patch
mm-pagewalkc-move-pte-null-check.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
mm-numa-add-migrated-transhuge-pages-to-lru-the-same-way-as-base-pages.patch
mm-swapc-introduce-put_refcounted_compound_page-helpers-for-spliting-put_compound_page.patch
mm-swapc-split-put_compound_page-function.patch
mm-introdule-compound_head_by_tail.patch
mm-replace-remap_file_pages-syscall-with-emulation-fix-2.patch
mm-replace-remap_file_pages-syscall-with-emulation-fix-3.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
kexec-save-pg_head_mask-in-vmcoreinfo.patch
linux-next.patch
x86vdso-fix-an-oops-accessing-the-hpet-mapping-w-o-an-hpet.patch
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