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author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2020-07-24 07:15:34 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-29 11:18:44 +0300 |
commit | 40c5836b4a48ab1f08674db5171c7def505842ab (patch) | |
tree | 4eb997aa14745d5e1dda166cb62ab6112f1247b2 /mm/khugepaged.c | |
parent | 95750e1edbcd9f9badc53ecc7059a5f40fdedfdc (diff) | |
download | linux-40c5836b4a48ab1f08674db5171c7def505842ab.tar.xz |
khugepaged: fix null-pointer dereference due to race
commit 594cced14ad3903166c8b091ff96adac7552f0b3 upstream.
khugepaged has to drop mmap lock several times while collapsing a page.
The situation can change while the lock is dropped and we need to
re-validate that the VMA is still in place and the PMD is still subject
for collapse.
But we miss one corner case: while collapsing an anonymous pages the VMA
could be replaced with file VMA. If the file VMA doesn't have any
private pages we get NULL pointer dereference:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
anon_vma_lock_write include/linux/rmap.h:120 [inline]
collapse_huge_page mm/khugepaged.c:1110 [inline]
khugepaged_scan_pmd mm/khugepaged.c:1349 [inline]
khugepaged_scan_mm_slot mm/khugepaged.c:2110 [inline]
khugepaged_do_scan mm/khugepaged.c:2193 [inline]
khugepaged+0x3bba/0x5a10 mm/khugepaged.c:2238
The fix is to make sure that the VMA is anonymous in
hugepage_vma_revalidate(). The helper is only used for collapsing
anonymous pages.
Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
Reported-by: syzbot+ed318e8b790ca72c5ad0@syzkaller.appspotmail.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Yang Shi <yang.shi@linux.alibaba.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200722121439.44328-1-kirill.shutemov@linux.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/khugepaged.c')
-rw-r--r-- | mm/khugepaged.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c index f765475be359..5977f7824a9a 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -876,6 +876,9 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address, return SCAN_ADDRESS_RANGE; if (!hugepage_vma_check(vma, vma->vm_flags)) return SCAN_VMA_CHECK; + /* Anon VMA expected */ + if (!vma->anon_vma || vma->vm_ops) + return SCAN_VMA_CHECK; return 0; } |