From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f69.google.com (mail-wm0-f69.google.com [74.125.82.69]) by kanga.kvack.org (Postfix) with ESMTP id 7E0886B0069 for ; Mon, 25 Sep 2017 12:51:53 -0400 (EDT) Received: by mail-wm0-f69.google.com with SMTP id r136so9193082wmf.4 for ; Mon, 25 Sep 2017 09:51:53 -0700 (PDT) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id l63si2292527edl.104.2017.09.25.09.51.51 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 25 Sep 2017 09:51:52 -0700 (PDT) From: Khalid Aziz Subject: [PATCH v8 8/9] mm: Clear arch specific VM flags on protection change Date: Mon, 25 Sep 2017 10:48:59 -0600 Message-Id: <9297528d3184e695e98129f4362a8f399b5783cf.1506089472.git.khalid.aziz@oracle.com> In-Reply-To: References: In-Reply-To: References: Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, dave.hansen@linux.intel.com Cc: Khalid Aziz , mhocko@suse.com, davem@davemloft.net, jack@suse.cz, kirill.shutemov@linux.intel.com, ross.zwisler@linux.intel.com, lstoakes@gmail.com, dave.jiang@intel.com, willy@infradead.org, hughd@google.com, ying.huang@intel.com, n-horiguchi@ah.jp.nec.com, heiko.carstens@de.ibm.com, mgorman@suse.de, aarcange@redhat.com, ak@linux.intel.com, aneesh.kumar@linux.vnet.ibm.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, Khalid Aziz When protection bits are changed on a VMA, some of the architecture specific flags should be cleared as well. An examples of this are the PKEY flags on x86. This patch expands the current code that clears PKEY flags for x86, to support similar functionality for other architectures as well. Signed-off-by: Khalid Aziz Cc: Khalid Aziz --- v7: - new patch include/linux/mm.h | 6 ++++++ mm/mprotect.c | 2 +- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index c1f6c95f3496..cbb21facce6b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -271,6 +271,12 @@ extern unsigned int kobjsize(const void *objp); /* This mask is used to clear all the VMA flags used by mlock */ #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) +/* Arch-specific flags to clear when updating VM flags on protection change */ +#ifndef VM_ARCH_CLEAR +# define VM_ARCH_CLEAR VM_NONE +#endif +#define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) + /* * mapping from the currently active vm_flags protection bits (the * low four bits) to a page protection mask.. diff --git a/mm/mprotect.c b/mm/mprotect.c index 4f0e46bb1797..85b65b3a823d 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -453,7 +453,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len, * cleared from the VMA. */ mask_off_old_flags = VM_READ | VM_WRITE | VM_EXEC | - ARCH_VM_PKEY_FLAGS; + VM_FLAGS_CLEAR; new_vma_pkey = arch_override_mprotect_pkey(vma, prot, pkey); newflags = calc_vm_prot_bits(prot, new_vma_pkey); -- 2.11.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org