/* Null security operations.
 *
 * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#include <net/af_rxrpc.h>
#include "ar-internal.h"

static int none_init_connection_security(struct rxrpc_connection *conn)
{
	return 0;
}

static int none_prime_packet_security(struct rxrpc_connection *conn)
{
	return 0;
}

static int none_secure_packet(struct rxrpc_call *call,
			      struct sk_buff *skb,
			      size_t data_size,
			      void *sechdr)
{
	return 0;
}

static int none_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
			      unsigned int offset, unsigned int len,
			      rxrpc_seq_t seq, u16 expected_cksum)
{
	return 0;
}

static void none_locate_data(struct rxrpc_call *call, struct sk_buff *skb,
			     unsigned int *_offset, unsigned int *_len)
{
}

static int none_respond_to_challenge(struct rxrpc_connection *conn,
				     struct sk_buff *skb,
				     u32 *_abort_code)
{
	*_abort_code = RX_PROTOCOL_ERROR;
	return -EPROTO;
}

static int none_verify_response(struct rxrpc_connection *conn,
				struct sk_buff *skb,
				u32 *_abort_code)
{
	*_abort_code = RX_PROTOCOL_ERROR;
	return -EPROTO;
}

static void none_clear(struct rxrpc_connection *conn)
{
}

static int none_init(void)
{
	return 0;
}

static void none_exit(void)
{
}

/*
 * RxRPC Kerberos-based security
 */
const struct rxrpc_security rxrpc_no_security = {
	.name				= "none",
	.security_index			= RXRPC_SECURITY_NONE,
	.init				= none_init,
	.exit				= none_exit,
	.init_connection_security	= none_init_connection_security,
	.prime_packet_security		= none_prime_packet_security,
	.secure_packet			= none_secure_packet,
	.verify_packet			= none_verify_packet,
	.locate_data			= none_locate_data,
	.respond_to_challenge		= none_respond_to_challenge,
	.verify_response		= none_verify_response,
	.clear				= none_clear,
};
f325a59cfc718d13a50fbc746ed9b415c25e92'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/drivers/usb/storage/protocol.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/storage?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>storage</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/storage/protocol.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>protocol.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='c8f325a59cfc718d13a50fbc746ed9b415c25e92'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;</td><td class='right'>2017-02-01 17:45:02 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 21:17:49 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/storage/protocol.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/storage/protocol.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/storage/protocol.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>drivers/usb/storage/protocol.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/storage/protocol.c?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/storage/protocol.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92&amp;id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff</a>)</td></tr></table>
<div class='commit-subject'>efi/fdt: Avoid FDT manipulation after ExitBootServices()</div><div class='commit-msg'>Some AArch64 UEFI implementations disable the MMU in ExitBootServices(),
after which unaligned accesses to RAM are no longer supported.

Commit:

  abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")

fixed an issue in the memory map handling of the stub FDT code, but
inadvertently created an issue with such firmware, by moving some
of the FDT manipulation to after the invocation of ExitBootServices().

Given that the stub's libfdt implementation uses the ordinary, accelerated
string functions, which rely on hardware handling of unaligned accesses,
manipulating the FDT with the MMU off may result in alignment faults.

So fix the situation by moving the update_fdt_memmap() call into the
callback function invoked by efi_exit_boot_services() right before it
calls the ExitBootServices() UEFI service (which is arguably a better
place for it anyway)

Note that disabling the MMU in ExitBootServices() is not compliant with
the UEFI spec, and carries great risk due to the fact that switching from
cached to uncached memory accesses halfway through compiler generated code
(i.e., involving a stack) can never be done in a way that is architecturally
safe.

Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Tested-by: Riku Voipio &lt;riku.voipio@linaro.org&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Cc: mark.rutland@arm.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: leif.lindholm@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Diffstat</a> (limited to 'drivers/usb/storage/protocol.c')</div><table summary='diffstat' class='diffstat'>ary='diffstat' class='diffstat'>