71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2015 Samsung Electronics Co., Ltd.
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*
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* Sensitive Data Protection
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <ddar/cache_cleanup.h>
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#define DDAR_CACHE_CLEANUP_DEBUG 0
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#if DDAR_CACHE_CLEANUP_DEBUG
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static void ddar_page_dump(unsigned char *buf, int len, const char *str)
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{
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unsigned int i;
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char s[512];
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s[0] = 0;
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for (i = 0; i < len && i < 32; ++i) {
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char tmp[8];
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sprintf(tmp, " %02x", buf[i]);
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strcat(s, tmp);
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}
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if (len > 32) {
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char tmp[8];
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sprintf(tmp, " ...");
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strcat(s, tmp);
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}
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pr_debug("%s [%s len=%d]\n", s, str, len);
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}
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#else
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static void ddar_page_dump(unsigned char *buf, int len, const char *str)
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{
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}
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#endif
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void ddar_page_cleanup(struct page *page)
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{
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if (page && page->mapping) {
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if (mapping_sensitive(page->mapping)) {
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void *d;
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#if DDAR_CACHE_CLEANUP_DEBUG
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pr_debug("%s : deleting [%s] sensitive page.\n",
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__func__, page->mapping->host->i_sb->s_type->name);
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//dump_stack();
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#endif
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d = kmap_local_page(page);
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if (d) {
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ddar_page_dump((unsigned char *)d, PAGE_SIZE, "freeing");
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clear_page(d);
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ddar_page_dump((unsigned char *)d, PAGE_SIZE, "freed");
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kunmap_local(d);
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}
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}
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}
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}
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