linux-kernel - [PATCH][mm/memory.c]: transparent hugepage check condition missed

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-next>] [day] [month] [year] [list]

Message-ID: <CAGW+__+9jOaSdmqGcdCTi+EnRyyNcZ3hFqdqpf3Nxjqb8ZQPbw@mail.gmail.com>
Date:	Mon, 31 Oct 2011 18:56:57 +0800
From:	GuanJun He <heguanbo@...il.com>
To:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH][mm/memory.c]: transparent hugepage check condition missed

For the transparent hugepage module still does not support
tmpfs and cache,the check condition should always be checked
to make sure that it only affect the anonymous maps, the
original check condition missed this, this patch is to fix this.
Otherwise,the hugepage may affect the file-backed maps,
then the cache for the small-size pages will be unuseful,
and till now there is still no implementation for hugepage's cache.

Signed-off-by: Guanjun He <gjhe@...e.com>
---
 mm/memory.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index a56e3ba..79b85fe 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3475,7 +3475,8 @@ int handle_mm_fault(struct mm_struct *mm, struct
vm_area_struct *vma,
 		if (pmd_trans_huge(orig_pmd)) {
 			if (flags & FAULT_FLAG_WRITE &&
 			    !pmd_write(orig_pmd) &&
-			    !pmd_trans_splitting(orig_pmd))
+			    !pmd_trans_splitting(orig_pmd) &&
+			    !vma->vm_ops)
 				return do_huge_pmd_wp_page(mm, vma, address,
 							   pmd, orig_pmd);
 			return 0;
--
--
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/