From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>, Dmitry Vyukov <dvyukov@google.com>,
Krzysztof Kozlowski <krzk@kernel.org>,
syzkaller <syzkaller@googlegroups.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Hailong Liu <liu.hailong6@zte.com.cn>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: Arm + KASAN + syzbot
Date: Mon, 15 Mar 2021 19:03:11 +0000 [thread overview]
Message-ID: <20210315190311.GM1463@shell.armlinux.org.uk> (raw)
In-Reply-To: <CACRpkdatfcNp_5UnkxEuEYCmHYAbV+TV1LJT512y7pDao=JjQg@mail.gmail.com>
On Mon, Mar 15, 2021 at 03:01:32PM +0100, Linus Walleij wrote:
> On Thu, Mar 11, 2021 at 3:55 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > If KASAN limits the address space available to user space, there might be
> > a related issue, even when there is still physical memory available.
>
> I'm just puzzled that OOM is not kicking in if the binary
> runs out of virtual memory (hits 0x6ee00000).
The OOM-killer has nothing to do with the virtual space for processes.
The OOM-killer is about physical page starvation in the kernel.
A process will instead find mmap() returning NULL or attempts to
increase the heap via brk() failing.
Neither of these events should result in any effect on the kernel;
the process on the other hand may make an illegal access and be
given a segfault.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2021-03-15 19:05 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 16:31 Arm + KASAN + syzbot Dmitry Vyukov
2021-01-19 8:36 ` Krzysztof Kozlowski
2021-01-19 8:46 ` Linus Walleij
2021-01-19 10:04 ` Dmitry Vyukov
2021-01-19 10:17 ` Linus Walleij
2021-01-19 10:23 ` Dmitry Vyukov
2021-01-19 10:28 ` Linus Walleij
2021-01-19 10:53 ` Dmitry Vyukov
2021-01-19 11:05 ` Dmitry Vyukov
2021-01-19 11:13 ` Russell King - ARM Linux admin
2021-01-19 11:17 ` Dmitry Vyukov
2021-01-19 11:43 ` Russell King - ARM Linux admin
2021-01-19 12:05 ` Dmitry Vyukov
2021-01-19 12:36 ` Russell King - ARM Linux admin
2021-01-19 18:57 ` Dmitry Vyukov
2021-01-19 19:48 ` Russell King - ARM Linux admin
2021-01-21 13:14 ` Russell King - ARM Linux admin
2021-01-21 13:49 ` Dmitry Vyukov
2021-01-21 14:04 ` Arnd Bergmann
2021-01-21 13:59 ` Dmitry Vyukov
2021-01-21 14:52 ` Linus Walleij
2021-01-26 21:24 ` Dmitry Vyukov
2021-01-27 8:24 ` Linus Walleij
2021-01-27 9:39 ` Dmitry Vyukov
2021-01-27 9:57 ` Linus Walleij
2021-01-27 10:12 ` Dmitry Vyukov
2021-01-27 10:19 ` Russell King - ARM Linux admin
2021-03-11 10:54 ` Dmitry Vyukov
2021-03-11 13:42 ` Russell King - ARM Linux admin
2021-03-11 18:05 ` Dmitry Vyukov
2021-03-11 13:55 ` Linus Walleij
2021-03-11 14:09 ` Russell King - ARM Linux admin
2021-03-11 14:37 ` Linus Walleij
2021-03-11 14:55 ` Arnd Bergmann
2021-03-11 18:08 ` Dmitry Vyukov
2021-03-15 14:01 ` Linus Walleij
2021-03-15 19:03 ` Russell King - ARM Linux admin [this message]
2021-01-19 13:22 ` Linus Walleij
2021-01-19 8:41 ` Linus Walleij
2021-01-19 8:43 ` Linus Walleij
2021-01-19 10:18 ` Dmitry Vyukov
2021-01-19 10:27 ` Linus Walleij
2021-01-19 10:36 ` Dmitry Vyukov
2021-01-19 10:03 ` Mark Rutland
2021-01-19 10:34 ` Dmitry Vyukov
2021-01-19 10:55 ` Russell King - ARM Linux admin
2021-01-19 13:00 ` Mark Rutland
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