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-prev] [day] [month] [year] [list]
Message-ID: <CAPcyv4ggrX0QGELcBt-Vu_xh6mtFvxMTiMsKYfKf4z72O73JVg@mail.gmail.com>
Date:	Wed, 28 Oct 2015 11:06:41 +0900
From:	Dan Williams <dan.j.williams@...el.com>
To:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Russell King <rmk+kernel@....linux.org.uk>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [for 4.4 PATCH] memremap: fix highmem support

On Wed, Oct 28, 2015 at 10:39 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> Currently memremap checks if the range is "System RAM" and returns the
> kernel linear address.  This is broken for highmem platforms where a
> range may be "System RAM", but is not part of the kernel linear mapping.
> Similar to acpi_map(), use kmap() for PAGE_SIZE memremap() requests for
> highmem, and fall back to ioremap_cache() otherwise.
>
> The impact of this bug is low for now since the pmem driver is the only
> user of memremap(), but this is important to fix before more conversions
> to memremap arrive in 4.4.
>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Cc: Russell King <rmk+kernel@....linux.org.uk>
> Reported-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
> Russell,
>
> I question whether the kmap fallback is needed.  This is borrowed from
> the current implementation of acpi_map(), and I added it since arm
> ioremap warns if passed pfn_valid() addresses.

I flubbed the subject line... this is for 4.3-final.
--
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/

Powered by blists - more mailing lists