linux-kernel - [PATCH 1/2] mm: fixup_userfault returns VM_FAULT

lists.openwall.net		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 linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1447890598-56860-2-git-send-email-dingel@linux.vnet.ibm.com>
Date:	Thu, 19 Nov 2015 00:49:57 +0100
From:	Dominik Dingel <dingel@...ux.vnet.ibm.com>
To:	linux-s390@...r.kernel.org, linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Eric B Munson <emunson@...mai.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mel Gorman <mgorman@...e.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Dominik Dingel <dingel@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mm: fixup_userfault returns VM_FAULT_RETRY if asked

When calling fixup_userfault with FAULT_FLAG_ALLOW_RETRY, fixup_userfault
didn't care about VM_FAULT_RETRY and returned 0. If the VM_FAULT_RETRY flag is
set we will return the complete result of handle_mm_fault.

Signed-off-by: Dominik Dingel <dingel@...ux.vnet.ibm.com>
---
 mm/gup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/gup.c b/mm/gup.c
index deafa2c..2af3b31 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -609,6 +609,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
 			return -EFAULT;
 		BUG();
 	}
+	if (ret & VM_FAULT_RETRY)
+		return ret;
 	if (tsk) {
 		if (ret & VM_FAULT_MAJOR)
 			tsk->maj_flt++;
-- 
2.3.9

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/