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From: Dmitry Vyukov <dvyukov@google.com>
To: Qian Cai <cai@lca.pw>
Cc: Walter Wu <walter-zh.wu@mediatek.com>,
	wsd_upstream <wsd_upstream@mediatek.com>,
	linux-mediatek@lists.infradead.org,
	LKML <linux-kernel@vger.kernel.org>,
	kasan-dev <kasan-dev@googlegroups.com>,
	Linux-MM <linux-mm@kvack.org>,
	Alexander Potapenko <glider@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y
Date: Tue, 8 Oct 2019 14:11:23 +0200	[thread overview]
Message-ID: <CACT4Y+Zbx-2yR-mN5GioaKUgGH1TpTE2D-OgLbR2Dy09ezyGGQ@mail.gmail.com> (raw)
In-Reply-To: <D2B6D82F-AE5F-4A45-AC0C-BE5DA601FDC3@lca.pw>

On Tue, Oct 8, 2019 at 1:42 PM Qian Cai <cai@lca.pw> wrote:
> > On Oct 8, 2019, at 7:02 AM, Walter Wu <walter-zh.wu@mediatek.com> wrote:
> > I don't know very well in UBSAN, but I try to build ubsan kernel and
> > test a negative number in memset and kmalloc_memmove_invalid_size(), it
> > look like no check.
>
> It sounds like more important to figure out why the UBSAN is not working in this case rather than duplicating functionality elsewhere.

Detecting out-of-bounds accesses is the direct KASAN responsibility.
Even more direct than for KUBSAN. We are not even adding
functionality, it's just a plain bug in KASAN code, it tricks itself
into thinking that access size is 0.
Maybe it's already detected by KUBSAN too?

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  parent reply	other threads:[~2019-10-08 12:11 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-27  3:43 Walter Wu
2019-09-27 13:07 ` Dmitry Vyukov
2019-09-27 14:22   ` Walter Wu
2019-09-27 19:41     ` Dmitry Vyukov
2019-09-30  4:36       ` Walter Wu
2019-09-30  8:57         ` Marc Gonzalez
2019-10-01  2:36           ` Walter Wu
2019-10-01  3:01             ` Dmitry Vyukov
2019-10-01  3:18               ` Walter Wu
2019-10-02 12:15         ` Walter Wu
2019-10-02 13:57           ` Dmitry Vyukov
2019-10-03  2:17             ` Walter Wu
2019-10-03  6:26               ` Dmitry Vyukov
2019-10-03  9:38                 ` Walter Wu
2019-10-03 13:51                   ` Walter Wu
2019-10-03 14:53                     ` Dmitry Vyukov
2019-10-04  4:42                       ` Walter Wu
2019-10-04  8:02                         ` Walter Wu
2019-10-04  9:18                           ` Dmitry Vyukov
2019-10-04  9:44                             ` Walter Wu
2019-10-04  9:54                               ` Dmitry Vyukov
2019-10-04 12:05                                 ` Walter Wu
2019-10-04 13:52                                   ` Dmitry Vyukov
2019-10-07  3:22                                     ` Walter Wu
2019-10-07  7:29                                       ` Dmitry Vyukov
2019-10-07  8:18                                         ` Walter Wu
2019-10-07  8:24                                           ` Dmitry Vyukov
2019-10-07  8:51                                             ` Walter Wu
2019-10-07  8:54                                               ` Dmitry Vyukov
2019-10-07  9:03                                                 ` Walter Wu
2019-10-07  9:10                                                   ` Dmitry Vyukov
2019-10-07  9:28                                                     ` Walter Wu
2019-10-07  9:50                                                       ` Walter Wu
2019-10-07 10:51                                                         ` Dmitry Vyukov
2019-10-07 12:03                                                           ` Walter Wu
2019-10-07 12:19                                                             ` Dmitry Vyukov
2019-10-07 12:32                                                               ` Walter Wu
2019-10-07 13:33                                                                 ` Dmitry Vyukov
2019-10-08  6:15                                                                   ` Walter Wu
2019-10-08  9:47                                                                     ` Qian Cai
2019-10-08 11:02                                                                       ` Walter Wu
2019-10-08 11:42                                                                         ` Qian Cai
2019-10-08 12:07                                                                           ` Walter Wu
2019-10-08 12:11                                                                           ` Dmitry Vyukov [this message]
2019-10-14  2:19                                                                             ` Walter Wu

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