lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 11 Jul 2014 00:53:26 +0300
From:	Oded Gabbay <>
To:	Andrew Morton <>
Cc:	David Airlie <>,
	Alex Deucher <>,
	Jerome Glisse <>,,,
	John Bridgman <>,
	Andrew Lewycky <>,
	Joerg Roedel <>, linux-mm <>,
	Oded Gabbay <>,
	Naoya Horiguchi <>,
	Joonsoo Kim <>,
	"Kirill A. Shutemov" <>,
	Hugh Dickins <>,
	Cyrill Gorcunov <>,
	Jérôme Glisse <>,
	Jianyu Zhan <>
Subject: [PATCH 28/83] mm: Change timing of notification to IOMMUs about a page to be invalidated

From: Andrew Lewycky <>

This patch changes the location of the mmu_notifier_invalidate_page function
call inside try_to_unmap_one. The mmu_notifier_invalidate_page function
call tells the IOMMU that a pgae should be invalidated.

The location is changed from after releasing the physical page to
before releasing the physical page.

This change should prevent the bug that would occur in the
(rare) case where the GPU attempts to access a page while the CPU
attempts to swap out that page (or discard it if it is not dirty).

Signed-off-by: Andrew Lewycky <>
Signed-off-by: Oded Gabbay <>
 mm/rmap.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 196cd0c..73d4c3d 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1231,13 +1231,17 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 	} else
 		dec_mm_counter(mm, MM_FILEPAGES);
+	pte_unmap_unlock(pte, ptl);
+	mmu_notifier_invalidate_page(vma, address, event);
+	return ret;
 	pte_unmap_unlock(pte, ptl);
-	if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK))
-		mmu_notifier_invalidate_page(vma, address, event);
 	return ret;

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists