From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f43.google.com (mail-pa0-f43.google.com [209.85.220.43]) by kanga.kvack.org (Postfix) with ESMTP id 483FC6B006E for ; Wed, 9 Jul 2014 07:36:52 -0400 (EDT) Received: by mail-pa0-f43.google.com with SMTP id lf10so9095232pab.2 for ; Wed, 09 Jul 2014 04:36:52 -0700 (PDT) Received: from mailout1.w1.samsung.com (mailout1.w1.samsung.com. [210.118.77.11]) by mx.google.com with ESMTPS id c6si7238389pdj.314.2014.07.09.04.36.50 for (version=TLSv1 cipher=RC4-MD5 bits=128/128); Wed, 09 Jul 2014 04:36:51 -0700 (PDT) Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout1.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0N8G00HZ7098G350@mailout1.w1.samsung.com> for linux-mm@kvack.org; Wed, 09 Jul 2014 12:36:44 +0100 (BST) From: Andrey Ryabinin Subject: [RFC/PATCH RESEND -next 20/21] fs: dcache: manually unpoison dname after allocation to shut up kasan's reports Date: Wed, 09 Jul 2014 15:30:14 +0400 Message-id: <1404905415-9046-21-git-send-email-a.ryabinin@samsung.com> In-reply-to: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: Dmitry Vyukov , Konstantin Serebryany , Alexey Preobrazhensky , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Sasha Levin , Michal Marek , Russell King , Thomas Gleixner , Ingo Molnar , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org, Andrey Ryabinin We need to manually unpoison rounded up allocation size for dname to avoid kasan's reports in __d_lookup_rcu. __d_lookup_rcu may validly read a little beyound allocated size. Reported-by: Dmitry Vyukov Signed-off-by: Andrey Ryabinin --- fs/dcache.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/dcache.c b/fs/dcache.c index b7e8b20..dff64f2 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -38,6 +38,7 @@ #include #include #include +#include #include "internal.h" #include "mount.h" @@ -1412,6 +1413,8 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name) kmem_cache_free(dentry_cache, dentry); return NULL; } + unpoison_shadow(dname, + roundup(name->len + 1, sizeof(unsigned long))); } else { dname = dentry->d_iname; } -- 1.8.5.5 -- 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