From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Tim Harvey <tharvey@gateworks.com>
Cc: Linux ARM Mailing List <linux-arm-kernel@lists.infradead.org>
Subject: Re: arm32 insecure W+X mapping
Date: Thu, 19 Aug 2021 22:28:19 +0100 [thread overview]
Message-ID: <20210819212819.GM22278@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAJ+vNU0PaPNHbJc5RXgrRYJw2aWowrGVMOrU1=hKhsCTXAB=DA@mail.gmail.com>
On Thu, Aug 19, 2021 at 10:19:46AM -0700, Tim Harvey wrote:
> Greetings,
>
> Since commit a8e53c151fe7 "(ARM: 8737/1: mm: dump: add checking for
> writable and executable)" I've been seeing the following appear on my
> arm32 kernel:
>
> arm/mm: Found insecure W+X mapping at address 0xf087d000
> ...
> Checked W+X mappings: FAILED, 1 W+X pages found
>
> As I haven't seen others report this I assume it's something unique to
> my kernel configuration. How do I debug what is causing the insecure
> page?
If you check /proc/vmallocinfo, it should tell you the physical
address that was mapped there, and the function that created the
mapping. That should give enough clues to track it down.
Thanks.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2021-08-19 21:30 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-19 17:19 arm32 insecure W+X mapping Tim Harvey
2021-08-19 21:28 ` Russell King (Oracle) [this message]
2021-08-19 23:59 ` Tim Harvey
2021-08-20 0:16 ` Russell King (Oracle)
2021-08-20 16:06 ` Tim Harvey
2021-08-20 17:48 ` Robin Murphy
2021-08-20 18:41 ` Tim Harvey
2021-09-07 17:48 ` Tim Harvey
2021-09-07 19:22 ` Russell King (Oracle)
2021-09-15 9:44 ` Fabio Estevam
2021-09-15 15:07 ` Tim Harvey
2021-09-20 16:22 ` Russell King (Oracle)
2021-09-20 20:56 ` Tim Harvey
2021-09-20 21:13 ` Russell King (Oracle)
2021-09-20 22:53 ` Tim Harvey
2021-09-20 23:12 ` Fabio Estevam
2021-09-20 23:19 ` Russell King (Oracle)
2021-09-21 0:21 ` Fabio Estevam
2021-09-21 15:13 ` Russell King (Oracle)
2021-09-22 3:37 ` Shawn Guo
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