1 files changed, 0 insertions, 273 deletions
diff --git a/kernel/module_decompress.c b/kernel/module_decompress.c
deleted file mode 100644
index ffef98a20320..000000000000
--- a/kernel/module_decompress.c
+++ /dev/null
@@ -1,273 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2021 Google LLC.
- */
-
-#include <linux/init.h>
-#include <linux/highmem.h>
-#include <linux/kobject.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/vmalloc.h>
-
-#include "module-internal.h"
-
-static int module_extend_max_pages(struct load_info *info, unsigned int extent)
-{
-	struct page **new_pages;
-
-	new_pages = kvmalloc_array(info->max_pages + extent,
-				   sizeof(info->pages), GFP_KERNEL);
-	if (!new_pages)
-		return -ENOMEM;
-
-	memcpy(new_pages, info->pages, info->max_pages * sizeof(info->pages));
-	kvfree(info->pages);
-	info->pages = new_pages;
-	info->max_pages += extent;
-
-	return 0;
-}
-
-static struct page *module_get_next_page(struct load_info *info)
-{
-	struct page *page;
-	int error;
-
-	if (info->max_pages == info->used_pages) {
-		error = module_extend_max_pages(info, info->used_pages);
-		if (error)
-			return ERR_PTR(error);
-	}
-
-	page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
-	if (!page)
-		return ERR_PTR(-ENOMEM);
-
-	info->pages[info->used_pages++] = page;
-	return page;
-}
-
-#ifdef CONFIG_MODULE_COMPRESS_GZIP
-#include <linux/zlib.h>
-#define MODULE_COMPRESSION	gzip
-#define MODULE_DECOMPRESS_FN	module_gzip_decompress
-
-/*
- * Calculate length of the header which consists of signature, header
- * flags, time stamp and operating system ID (10 bytes total), plus
- * an optional filename.
- */
-static size_t module_gzip_header_len(const u8 *buf, size_t size)
-{
-	const u8 signature[] = { 0x1f, 0x8b, 0x08 };
-	size_t len = 10;
-
-	if (size < len || memcmp(buf, signature, sizeof(signature)))
-		return 0;
-
-	if (buf[3] & 0x08) {
-		do {
-			/*
-			 * If we can't find the end of the file name we must
-			 * be dealing with a corrupted file.
-			 */
-			if (len == size)
-				return 0;
-		} while (buf[len++] != '\0');
-	}
-
-	return len;
-}
-
-static ssize_t module_gzip_decompress(struct load_info *info,
-				      const void *buf, size_t size)
-{
-	struct z_stream_s s = { 0 };
-	size_t new_size = 0;
-	size_t gzip_hdr_len;
-	ssize_t retval;
-	int rc;
-
-	gzip_hdr_len = module_gzip_header_len(buf, size);
-	if (!gzip_hdr_len) {
-		pr_err("not a gzip compressed module\n");
-		return -EINVAL;
-	}
-
-	s.next_in = buf + gzip_hdr_len;
-	s.avail_in = size - gzip_hdr_len;
-
-	s.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
-	if (!s.workspace)
-		return -ENOMEM;
-
-	rc = zlib_inflateInit2(&s, -MAX_WBITS);
-	if (rc != Z_OK) {
-		pr_err("failed to initialize decompressor: %d\n", rc);
-		retval = -EINVAL;
-		goto out;
-	}
-
-	do {
-		struct page *page = module_get_next_page(info);
-		if (!page) {
-			retval = -ENOMEM;
-			goto out_inflate_end;
-		}
-
-		s.next_out = kmap(page);
-		s.avail_out = PAGE_SIZE;
-		rc = zlib_inflate(&s, 0);
-		kunmap(page);
-
-		new_size += PAGE_SIZE - s.avail_out;
-	} while (rc == Z_OK);
-
-	if (rc != Z_STREAM_END) {
-		pr_err("decompression failed with status %d\n", rc);
-		retval = -EINVAL;
-		goto out_inflate_end;
-	}
-
-	retval = new_size;
-
-out_inflate_end:
-	zlib_inflateEnd(&s);
-out:
-	kfree(s.workspace);
-	return retval;
-}
-#elif CONFIG_MODULE_COMPRESS_XZ
-#include <linux/xz.h>
-#define MODULE_COMPRESSION	xz
-#define MODULE_DECOMPRESS_FN	module_xz_decompress
-
-static ssize_t module_xz_decompress(struct load_info *info,
-				    const void *buf, size_t size)
-{
-	static const u8 signature[] = { 0xfd, '7', 'z', 'X', 'Z', 0 };
-	struct xz_dec *xz_dec;
-	struct xz_buf xz_buf;
-	enum xz_ret xz_ret;
-	size_t new_size = 0;
-	ssize_t retval;
-
-	if (size < sizeof(signature) ||
-	    memcmp(buf, signature, sizeof(signature))) {
-		pr_err("not an xz compressed module\n");
-		return -EINVAL;
-	}
-
-	xz_dec = xz_dec_init(XZ_DYNALLOC, (u32)-1);
-	if (!xz_dec)
-		return -ENOMEM;
-
-	xz_buf.in_size = size;
-	xz_buf.in = buf;
-	xz_buf.in_pos = 0;
-
-	do {
-		struct page *page = module_get_next_page(info);
-		if (!page) {
-			retval = -ENOMEM;
-			goto out;
-		}
-
-		xz_buf.out = kmap(page);
-		xz_buf.out_pos = 0;
-		xz_buf.out_size = PAGE_SIZE;
-		xz_ret = xz_dec_run(xz_dec, &xz_buf);
-		kunmap(page);
-
-		new_size += xz_buf.out_pos;
-	} while (xz_buf.out_pos == PAGE_SIZE && xz_ret == XZ_OK);
-
-	if (xz_ret != XZ_STREAM_END) {
-		pr_err("decompression failed with status %d\n", xz_ret);
-		retval = -EINVAL;
-		goto out;
-	}
-
-	retval = new_size;
-
- out:
-	xz_dec_end(xz_dec);
-	return retval;
-}
-#else
-#error "Unexpected configuration for CONFIG_MODULE_DECOMPRESS"
-#endif
-
-int module_decompress(struct load_info *info, const void *buf, size_t size)
-{
-	unsigned int n_pages;
-	ssize_t data_size;
-	int error;
-
-	/*
-	 * Start with number of pages twice as big as needed for
-	 * compressed data.
-	 */
-	n_pages = DIV_ROUND_UP(size, PAGE_SIZE) * 2;
-	error = module_extend_max_pages(info, n_pages);
-
-	data_size = MODULE_DECOMPRESS_FN(info, buf, size);
-	if (data_size < 0) {
-		error = data_size;
-		goto err;
-	}
-
-	info->hdr = vmap(info->pages, info->used_pages, VM_MAP, PAGE_KERNEL);
-	if (!info->hdr) {
-		error = -ENOMEM;
-		goto err;
-	}
-
-	info->len = data_size;
-	return 0;
-
-err:
-	module_decompress_cleanup(info);
-	return error;
-}
-
-void module_decompress_cleanup(struct load_info *info)
-{
-	int i;
-
-	if (info->hdr)
-		vunmap(info->hdr);
-
-	for (i = 0; i < info->used_pages; i++)
-		__free_page(info->pages[i]);
-
-	kvfree(info->pages);
-
-	info->pages = NULL;
-	info->max_pages = info->used_pages = 0;
-}
-
-#ifdef CONFIG_SYSFS
-static ssize_t compression_show(struct kobject *kobj,
-				struct kobj_attribute *attr, char *buf)
-{
-	return sysfs_emit(buf, "%s\n", __stringify(MODULE_COMPRESSION));
-}
-static struct kobj_attribute module_compression_attr = __ATTR_RO(compression);
-
-static int __init module_decompress_sysfs_init(void)
-{
-	int error;
-
-	error = sysfs_create_file(&module_kset->kobj,
-				  &module_compression_attr.attr);
-	if (error)
-		pr_warn("Failed to create 'compression' attribute");
-
-	return 0;
-}
-late_initcall(module_decompress_sysfs_init);
-#endif