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From: Arnd Bergmann <arnd@arndb.de>
To: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Vivek Goyal <vgoyal@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Stewart Smith <stewart@linux.vnet.ibm.com>,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	bhe@redhat.com, linuxppc-dev@lists.ozlabs.org,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	AKASHI Takahiro <takahiro.akashi@linaro.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>,
	Samuel Mendoza-Jonas <sam@mendozajonas.com>,
	Dave Young <dyoung@redhat.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC 0/3] extend kexec_file_load system call
Date: Fri, 15 Jul 2016 22:26:09 +0200	[thread overview]
Message-ID: <3489461.zQnV5C1bXR@wuerfel> (raw)
In-Reply-To: <20160715134209.GF1041@n2100.armlinux.org.uk>

On Friday, July 15, 2016 2:42:10 PM CEST Russell King - ARM Linux wrote:
> 
> On other architectures, DT can also contain open-firmware "functions"
> but I don't think there's much support in the kernel for that - maybe
> the PPC folk can reply on that point.

The open firmware runtime interface are shut down by the time we have
a flattened device tree, so those are not accessible any more. IIRC
SPARC leaves the open firmware interface live, but it doesn't use
fdt, so that's not relevant here.

However, the powerpc specific RTAS runtime services provide a similar
interface to the UEFI runtime support and allow to call into
binary code from the kernel, which gets mapped from a physical
address in the "linux,rtas-base" property in the rtas device node.

Modifying the /rtas node will definitely give you a backdoor into
priviledged code, but modifying only /chosen should not let you get
in through that specific method.

	Arnd

  reply	other threads:[~2016-07-15 20:27 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-12  1:41 [RFC 0/3] extend kexec_file_load system call AKASHI Takahiro
2016-07-12  1:41 ` [RFC 1/3] syscall: add kexec_file_load to generic unistd.h AKASHI Takahiro
2016-07-12  1:42 ` [RFC 2/3] kexec: add dtb info to struct kimage AKASHI Takahiro
2016-07-12  1:42 ` [RFC 3/3] kexec: extend kexec_file_load system call AKASHI Takahiro
2016-07-15 13:09   ` Vivek Goyal
2016-07-15 13:19     ` Mark Rutland
2016-07-18  2:30       ` Dave Young
2016-07-18 10:07         ` Mark Rutland
2016-07-19  0:55           ` Dave Young
2016-07-19 10:52             ` Mark Rutland
2016-07-19 12:24               ` Vivek Goyal
2016-07-19 12:47                 ` Mark Rutland
2016-07-19 13:26                   ` Vivek Goyal
2016-07-20 11:41         ` David Laight
2016-07-21  9:21           ` Russell King - ARM Linux
2016-07-18  2:33     ` Dave Young
2016-07-27  0:24   ` [PATCH v2 " Thiago Jung Bauermann
2016-08-05 20:46     ` Thiago Jung Bauermann
2016-07-12 13:25 ` [RFC 0/3] " Eric W. Biederman
2016-07-12 13:58   ` Thiago Jung Bauermann
2016-07-12 14:02     ` Vivek Goyal
2016-07-12 23:45       ` Stewart Smith
2016-07-13 13:27         ` Vivek Goyal
2016-07-12 14:02   ` Arnd Bergmann
2016-07-12 14:18     ` Vivek Goyal
2016-07-12 14:24       ` Arnd Bergmann
2016-07-12 14:50         ` Mark Rutland
2016-07-13  2:36           ` Dave Young
2016-07-13  8:01             ` Arnd Bergmann
2016-07-13  8:23               ` Stewart Smith
2016-07-13  9:41               ` Mark Rutland
2016-07-13 13:13                 ` Arnd Bergmann
2016-07-13 18:45                   ` Thiago Jung Bauermann
2016-07-13 19:59                     ` Arnd Bergmann
2016-07-14  2:18                       ` Thiago Jung Bauermann
2016-07-14  8:29                         ` Arnd Bergmann
2016-07-15  1:44                           ` Thiago Jung Bauermann
2016-07-15  7:31                             ` Arnd Bergmann
2016-07-15 13:26                               ` Vivek Goyal
2016-07-15 13:33                                 ` Mark Rutland
2016-07-15 15:29                                   ` Thiago Jung Bauermann
2016-07-15 15:47                                     ` Mark Rutland
2016-07-15 13:42                                 ` Russell King - ARM Linux
2016-07-15 20:26                                   ` Arnd Bergmann [this message]
2016-07-15 21:03                                     ` Thiago Jung Bauermann
2016-07-22  0:09                                       ` Thiago Jung Bauermann
2016-07-22  0:53                                         ` Jeremy Kerr
2016-07-22  2:54                                         ` Michael Ellerman
2016-07-22 20:41                                           ` Thiago Jung Bauermann
2016-07-15  8:49                   ` Russell King - ARM Linux
2016-07-15 13:03                     ` Vivek Goyal
2016-07-13  9:34             ` Mark Rutland
2016-07-13 17:38               ` AKASHI Takahiro
2016-07-13 17:58                 ` Mark Rutland
2016-07-13 19:57                   ` Arnd Bergmann
2016-07-14 12:42                     ` Mark Rutland
2016-07-14  1:54                 ` Dave Young
2016-07-14  1:50               ` Dave Young
2016-07-12 16:25   ` Thiago Jung Bauermann
2016-07-12 20:58     ` Petr Tesarik
2016-07-12 21:22       ` Eric W. Biederman
2016-07-12 21:36         ` Eric W. Biederman
2016-07-12 21:53         ` Petr Tesarik
2016-07-12 22:18       ` Russell King - ARM Linux
2016-07-13  4:59         ` Stewart Smith
2016-07-13  7:36           ` Russell King - ARM Linux
2016-07-13  7:47             ` Ard Biesheuvel
2016-07-13  8:09               ` Russell King - ARM Linux
2016-07-13  8:20               ` Stewart Smith
2016-07-13  7:55             ` Stewart Smith
2016-07-13  8:26               ` Russell King - ARM Linux
2016-07-13  8:36                 ` Dave Young
2016-07-13  8:57                 ` Petr Tesarik
2016-07-13 13:03                 ` Vivek Goyal
2016-07-13 17:40                   ` Russell King - ARM Linux
2016-07-13 18:22                     ` Vivek Goyal
2016-07-18 12:46                       ` Balbir Singh
2016-07-18 13:26                         ` Vivek Goyal
2016-07-18 13:38                           ` Vivek Goyal
2016-07-20  3:45                           ` Balbir Singh
2016-07-20  8:35                             ` Russell King - ARM Linux
2016-07-20 11:12                               ` Arnd Bergmann
2016-07-20 15:50                                 ` Thiago Jung Bauermann
2016-07-20 12:46                               ` Vivek Goyal
2016-07-20 12:27                             ` Vivek Goyal
2016-07-12 23:41       ` Stewart Smith
2016-07-13 13:25         ` Vivek Goyal

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