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Revision 2e85d32b1c865bec703ce0c962221a5e955c52c2 authored by SeongJae Park on 14 December 2020, 09:04:18 UTC, committed by Juergen Gross on 14 December 2020, 09:04:18 UTC 
xen/xenbus: Add 'will_handle' callback support in xenbus_watch_path()
 
Some code does not directly make 'xenbus_watch' object and call
'register_xenbus_watch()' but use 'xenbus_watch_path()' instead.  This
commit adds support of 'will_handle' callback in the
'xenbus_watch_path()' and it's wrapper, 'xenbus_watch_pathfmt()'.

This is part of XSA-349

Cc: stable@vger.kernel.org
Signed-off-by: SeongJae Park <sjpark@amazon.de>
Reported-by: Michael Kurth <mku@amazon.de>
Reported-by: Pawel Wieczorkiewicz <wipawel@amazon.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
1 parent fed1755
Raw File
module_signing.c 
// SPDX-License-Identifier: GPL-2.0-or-later
/* Module signature checker
 *
 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/module_signature.h>
#include <linux/string.h>
#include <linux/verification.h>
#include <crypto/public_key.h>
#include "module-internal.h"

/*
 * Verify the signature on a module.
 */
int mod_verify_sig(const void *mod, struct load_info *info)
{
	struct module_signature ms;
	size_t sig_len, modlen = info->len;
	int ret;

	pr_devel("==>%s(,%zu)\n", __func__, modlen);

	if (modlen <= sizeof(ms))
		return -EBADMSG;

	memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));

	ret = mod_check_sig(&ms, modlen, info->name);
	if (ret)
		return ret;

	sig_len = be32_to_cpu(ms.sig_len);
	modlen -= sig_len + sizeof(ms);
	info->len = modlen;

	return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
				      VERIFY_USE_SECONDARY_KEYRING,
				      VERIFYING_MODULE_SIGNATURE,
				      NULL, NULL);
}
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