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1/*
2 * misc.c
3 *
4 * This is a collection of several routines from gzip-1.0.3
5 * adapted for Linux.
6 *
7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
8 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
9 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
10 */
11
12#include "misc.h"
13
14/* WARNING!!
15 * This code is compiled with -fPIC and it is relocated dynamically
16 * at run time, but no relocation processing is performed.
17 * This means that it is not safe to place pointers in static structures.
18 */
19
20/*
21 * Getting to provable safe in place decompression is hard.
22 * Worst case behaviours need to be analyzed.
23 * Background information:
24 *
25 * The file layout is:
26 * magic[2]
27 * method[1]
28 * flags[1]
29 * timestamp[4]
30 * extraflags[1]
31 * os[1]
32 * compressed data blocks[N]
33 * crc[4] orig_len[4]
34 *
35 * resulting in 18 bytes of non compressed data overhead.
36 *
37 * Files divided into blocks
38 * 1 bit (last block flag)
39 * 2 bits (block type)
40 *
41 * 1 block occurs every 32K -1 bytes or when there 50% compression
42 * has been achieved. The smallest block type encoding is always used.
43 *
44 * stored:
45 * 32 bits length in bytes.
46 *
47 * fixed:
48 * magic fixed tree.
49 * symbols.
50 *
51 * dynamic:
52 * dynamic tree encoding.
53 * symbols.
54 *
55 *
56 * The buffer for decompression in place is the length of the
57 * uncompressed data, plus a small amount extra to keep the algorithm safe.
58 * The compressed data is placed at the end of the buffer. The output
59 * pointer is placed at the start of the buffer and the input pointer
60 * is placed where the compressed data starts. Problems will occur
61 * when the output pointer overruns the input pointer.
62 *
63 * The output pointer can only overrun the input pointer if the input
64 * pointer is moving faster than the output pointer. A condition only
65 * triggered by data whose compressed form is larger than the uncompressed
66 * form.
67 *
68 * The worst case at the block level is a growth of the compressed data
69 * of 5 bytes per 32767 bytes.
70 *
71 * The worst case internal to a compressed block is very hard to figure.
72 * The worst case can at least be boundined by having one bit that represents
73 * 32764 bytes and then all of the rest of the bytes representing the very
74 * very last byte.
75 *
76 * All of which is enough to compute an amount of extra data that is required
77 * to be safe. To avoid problems at the block level allocating 5 extra bytes
78 * per 32767 bytes of data is sufficient. To avoind problems internal to a
79 * block adding an extra 32767 bytes (the worst case uncompressed block size)
80 * is sufficient, to ensure that in the worst case the decompressed data for
81 * block will stop the byte before the compressed data for a block begins.
82 * To avoid problems with the compressed data's meta information an extra 18
83 * bytes are needed. Leading to the formula:
84 *
85 * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
86 *
87 * Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
88 * Adding 32768 instead of 32767 just makes for round numbers.
89 * Adding the decompressor_size is necessary as it musht live after all
90 * of the data as well. Last I measured the decompressor is about 14K.
91 * 10K of actual data and 4K of bss.
92 *
93 */
94
95/*
96 * gzip declarations
97 */
98#define STATIC static
99
100#undef memset
101#undef memcpy
102#define memzero(s, n) memset((s), 0, (n))
103
104
105static void error(char *m);
106
107/*
108 * This is set up by the setup-routine at boot-time
109 */
110struct boot_params *real_mode; /* Pointer to real-mode data */
111static int quiet;
112static int debug;
113
114void *memset(void *s, int c, size_t n);
115void *memcpy(void *dest, const void *src, size_t n);
116
117#ifdef CONFIG_X86_64
118#define memptr long
119#else
120#define memptr unsigned
121#endif
122
123static memptr free_mem_ptr;
124static memptr free_mem_end_ptr;
125
126static char *vidmem;
127static int vidport;
128static int lines, cols;
129
130#ifdef CONFIG_KERNEL_GZIP
131#include "../../../../lib/decompress_inflate.c"
132#endif
133
134#ifdef CONFIG_KERNEL_BZIP2
135#include "../../../../lib/decompress_bunzip2.c"
136#endif
137
138#ifdef CONFIG_KERNEL_LZMA
139#include "../../../../lib/decompress_unlzma.c"
140#endif
141
142#ifdef CONFIG_KERNEL_XZ
143#include "../../../../lib/decompress_unxz.c"
144#endif
145
146#ifdef CONFIG_KERNEL_LZO
147#include "../../../../lib/decompress_unlzo.c"
148#endif
149
150static void scroll(void)
151{
152 int i;
153
154 memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
155 for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
156 vidmem[i] = ' ';
157}
158
159#define XMTRDY 0x20
160
161#define TXR 0 /* Transmit register (WRITE) */
162#define LSR 5 /* Line Status */
163static void serial_putchar(int ch)
164{
165 unsigned timeout = 0xffff;
166
167 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
168 cpu_relax();
169
170 outb(ch, early_serial_base + TXR);
171}
172
173void __putstr(int error, const char *s)
174{
175 int x, y, pos;
176 char c;
177
178#ifndef CONFIG_X86_VERBOSE_BOOTUP
179 if (!error)
180 return;
181#endif
182 if (early_serial_base) {
183 const char *str = s;
184 while (*str) {
185 if (*str == '\n')
186 serial_putchar('\r');
187 serial_putchar(*str++);
188 }
189 }
190
191 if (real_mode->screen_info.orig_video_mode == 0 &&
192 lines == 0 && cols == 0)
193 return;
194
195 x = real_mode->screen_info.orig_x;
196 y = real_mode->screen_info.orig_y;
197
198 while ((c = *s++) != '\0') {
199 if (c == '\n') {
200 x = 0;
201 if (++y >= lines) {
202 scroll();
203 y--;
204 }
205 } else {
206 vidmem[(x + cols * y) * 2] = c;
207 if (++x >= cols) {
208 x = 0;
209 if (++y >= lines) {
210 scroll();
211 y--;
212 }
213 }
214 }
215 }
216
217 real_mode->screen_info.orig_x = x;
218 real_mode->screen_info.orig_y = y;
219
220 pos = (x + cols * y) * 2; /* Update cursor position */
221 outb(14, vidport);
222 outb(0xff & (pos >> 9), vidport+1);
223 outb(15, vidport);
224 outb(0xff & (pos >> 1), vidport+1);
225}
226
227void *memset(void *s, int c, size_t n)
228{
229 int i;
230 char *ss = s;
231
232 for (i = 0; i < n; i++)
233 ss[i] = c;
234 return s;
235}
236#ifdef CONFIG_X86_32
237void *memcpy(void *dest, const void *src, size_t n)
238{
239 int d0, d1, d2;
240 asm volatile(
241 "rep ; movsl\n\t"
242 "movl %4,%%ecx\n\t"
243 "rep ; movsb\n\t"
244 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
245 : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
246 : "memory");
247
248 return dest;
249}
250#else
251void *memcpy(void *dest, const void *src, size_t n)
252{
253 long d0, d1, d2;
254 asm volatile(
255 "rep ; movsq\n\t"
256 "movq %4,%%rcx\n\t"
257 "rep ; movsb\n\t"
258 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
259 : "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)
260 : "memory");
261
262 return dest;
263}
264#endif
265
266static void error(char *x)
267{
268 __putstr(1, "\n\n");
269 __putstr(1, x);
270 __putstr(1, "\n\n -- System halted");
271
272 while (1)
273 asm("hlt");
274}
275
276static void parse_elf(void *output)
277{
278#ifdef CONFIG_X86_64
279 Elf64_Ehdr ehdr;
280 Elf64_Phdr *phdrs, *phdr;
281#else
282 Elf32_Ehdr ehdr;
283 Elf32_Phdr *phdrs, *phdr;
284#endif
285 void *dest;
286 int i;
287
288 memcpy(&ehdr, output, sizeof(ehdr));
289 if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
290 ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
291 ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
292 ehdr.e_ident[EI_MAG3] != ELFMAG3) {
293 error("Kernel is not a valid ELF file");
294 return;
295 }
296
297 if (!quiet)
298 putstr("Parsing ELF... ");
299
300 phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
301 if (!phdrs)
302 error("Failed to allocate space for phdrs");
303
304 memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
305
306 for (i = 0; i < ehdr.e_phnum; i++) {
307 phdr = &phdrs[i];
308
309 switch (phdr->p_type) {
310 case PT_LOAD:
311#ifdef CONFIG_RELOCATABLE
312 dest = output;
313 dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
314#else
315 dest = (void *)(phdr->p_paddr);
316#endif
317 memcpy(dest,
318 output + phdr->p_offset,
319 phdr->p_filesz);
320 break;
321 default: /* Ignore other PT_* */ break;
322 }
323 }
324}
325
326asmlinkage void decompress_kernel(void *rmode, memptr heap,
327 unsigned char *input_data,
328 unsigned long input_len,
329 unsigned char *output)
330{
331 real_mode = rmode;
332
333 if (cmdline_find_option_bool("quiet"))
334 quiet = 1;
335 if (cmdline_find_option_bool("debug"))
336 debug = 1;
337
338 if (real_mode->screen_info.orig_video_mode == 7) {
339 vidmem = (char *) 0xb0000;
340 vidport = 0x3b4;
341 } else {
342 vidmem = (char *) 0xb8000;
343 vidport = 0x3d4;
344 }
345
346 lines = real_mode->screen_info.orig_video_lines;
347 cols = real_mode->screen_info.orig_video_cols;
348
349 console_init();
350 if (debug)
351 putstr("early console in decompress_kernel\n");
352
353 free_mem_ptr = heap; /* Heap */
354 free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
355
356 if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
357 error("Destination address inappropriately aligned");
358#ifdef CONFIG_X86_64
359 if (heap > 0x3fffffffffffUL)
360 error("Destination address too large");
361#else
362 if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
363 error("Destination address too large");
364#endif
365#ifndef CONFIG_RELOCATABLE
366 if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
367 error("Wrong destination address");
368#endif
369
370 if (!quiet)
371 putstr("\nDecompressing Linux... ");
372 decompress(input_data, input_len, NULL, NULL, output, NULL, error);
373 parse_elf(output);
374 if (!quiet)
375 putstr("done.\nBooting the kernel.\n");
376 return;
377}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * misc.c
4 *
5 * This is a collection of several routines used to extract the kernel
6 * which includes KASLR relocation, decompression, ELF parsing, and
7 * relocation processing. Additionally included are the screen and serial
8 * output functions and related debugging support functions.
9 *
10 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
11 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
12 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
13 */
14
15#include "misc.h"
16#include "error.h"
17#include "pgtable.h"
18#include "../string.h"
19#include "../voffset.h"
20#include <asm/bootparam_utils.h>
21
22/*
23 * WARNING!!
24 * This code is compiled with -fPIC and it is relocated dynamically at
25 * run time, but no relocation processing is performed. This means that
26 * it is not safe to place pointers in static structures.
27 */
28
29/* Macros used by the included decompressor code below. */
30#define STATIC static
31
32/*
33 * Provide definitions of memzero and memmove as some of the decompressors will
34 * try to define their own functions if these are not defined as macros.
35 */
36#define memzero(s, n) memset((s), 0, (n))
37#define memmove memmove
38
39/* Functions used by the included decompressor code below. */
40void *memmove(void *dest, const void *src, size_t n);
41
42/*
43 * This is set up by the setup-routine at boot-time
44 */
45struct boot_params *boot_params;
46
47memptr free_mem_ptr;
48memptr free_mem_end_ptr;
49
50static char *vidmem;
51static int vidport;
52static int lines, cols;
53
54#ifdef CONFIG_KERNEL_GZIP
55#include "../../../../lib/decompress_inflate.c"
56#endif
57
58#ifdef CONFIG_KERNEL_BZIP2
59#include "../../../../lib/decompress_bunzip2.c"
60#endif
61
62#ifdef CONFIG_KERNEL_LZMA
63#include "../../../../lib/decompress_unlzma.c"
64#endif
65
66#ifdef CONFIG_KERNEL_XZ
67#include "../../../../lib/decompress_unxz.c"
68#endif
69
70#ifdef CONFIG_KERNEL_LZO
71#include "../../../../lib/decompress_unlzo.c"
72#endif
73
74#ifdef CONFIG_KERNEL_LZ4
75#include "../../../../lib/decompress_unlz4.c"
76#endif
77
78#ifdef CONFIG_KERNEL_ZSTD
79#include "../../../../lib/decompress_unzstd.c"
80#endif
81/*
82 * NOTE: When adding a new decompressor, please update the analysis in
83 * ../header.S.
84 */
85
86static void scroll(void)
87{
88 int i;
89
90 memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
91 for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
92 vidmem[i] = ' ';
93}
94
95#define XMTRDY 0x20
96
97#define TXR 0 /* Transmit register (WRITE) */
98#define LSR 5 /* Line Status */
99static void serial_putchar(int ch)
100{
101 unsigned timeout = 0xffff;
102
103 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
104 cpu_relax();
105
106 outb(ch, early_serial_base + TXR);
107}
108
109void __putstr(const char *s)
110{
111 int x, y, pos;
112 char c;
113
114 if (early_serial_base) {
115 const char *str = s;
116 while (*str) {
117 if (*str == '\n')
118 serial_putchar('\r');
119 serial_putchar(*str++);
120 }
121 }
122
123 if (lines == 0 || cols == 0)
124 return;
125
126 x = boot_params->screen_info.orig_x;
127 y = boot_params->screen_info.orig_y;
128
129 while ((c = *s++) != '\0') {
130 if (c == '\n') {
131 x = 0;
132 if (++y >= lines) {
133 scroll();
134 y--;
135 }
136 } else {
137 vidmem[(x + cols * y) * 2] = c;
138 if (++x >= cols) {
139 x = 0;
140 if (++y >= lines) {
141 scroll();
142 y--;
143 }
144 }
145 }
146 }
147
148 boot_params->screen_info.orig_x = x;
149 boot_params->screen_info.orig_y = y;
150
151 pos = (x + cols * y) * 2; /* Update cursor position */
152 outb(14, vidport);
153 outb(0xff & (pos >> 9), vidport+1);
154 outb(15, vidport);
155 outb(0xff & (pos >> 1), vidport+1);
156}
157
158void __puthex(unsigned long value)
159{
160 char alpha[2] = "0";
161 int bits;
162
163 for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
164 unsigned long digit = (value >> bits) & 0xf;
165
166 if (digit < 0xA)
167 alpha[0] = '0' + digit;
168 else
169 alpha[0] = 'a' + (digit - 0xA);
170
171 __putstr(alpha);
172 }
173}
174
175#ifdef CONFIG_X86_NEED_RELOCS
176static void handle_relocations(void *output, unsigned long output_len,
177 unsigned long virt_addr)
178{
179 int *reloc;
180 unsigned long delta, map, ptr;
181 unsigned long min_addr = (unsigned long)output;
182 unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
183
184 /*
185 * Calculate the delta between where vmlinux was linked to load
186 * and where it was actually loaded.
187 */
188 delta = min_addr - LOAD_PHYSICAL_ADDR;
189
190 /*
191 * The kernel contains a table of relocation addresses. Those
192 * addresses have the final load address of the kernel in virtual
193 * memory. We are currently working in the self map. So we need to
194 * create an adjustment for kernel memory addresses to the self map.
195 * This will involve subtracting out the base address of the kernel.
196 */
197 map = delta - __START_KERNEL_map;
198
199 /*
200 * 32-bit always performs relocations. 64-bit relocations are only
201 * needed if KASLR has chosen a different starting address offset
202 * from __START_KERNEL_map.
203 */
204 if (IS_ENABLED(CONFIG_X86_64))
205 delta = virt_addr - LOAD_PHYSICAL_ADDR;
206
207 if (!delta) {
208 debug_putstr("No relocation needed... ");
209 return;
210 }
211 debug_putstr("Performing relocations... ");
212
213 /*
214 * Process relocations: 32 bit relocations first then 64 bit after.
215 * Three sets of binary relocations are added to the end of the kernel
216 * before compression. Each relocation table entry is the kernel
217 * address of the location which needs to be updated stored as a
218 * 32-bit value which is sign extended to 64 bits.
219 *
220 * Format is:
221 *
222 * kernel bits...
223 * 0 - zero terminator for 64 bit relocations
224 * 64 bit relocation repeated
225 * 0 - zero terminator for inverse 32 bit relocations
226 * 32 bit inverse relocation repeated
227 * 0 - zero terminator for 32 bit relocations
228 * 32 bit relocation repeated
229 *
230 * So we work backwards from the end of the decompressed image.
231 */
232 for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
233 long extended = *reloc;
234 extended += map;
235
236 ptr = (unsigned long)extended;
237 if (ptr < min_addr || ptr > max_addr)
238 error("32-bit relocation outside of kernel!\n");
239
240 *(uint32_t *)ptr += delta;
241 }
242#ifdef CONFIG_X86_64
243 while (*--reloc) {
244 long extended = *reloc;
245 extended += map;
246
247 ptr = (unsigned long)extended;
248 if (ptr < min_addr || ptr > max_addr)
249 error("inverse 32-bit relocation outside of kernel!\n");
250
251 *(int32_t *)ptr -= delta;
252 }
253 for (reloc--; *reloc; reloc--) {
254 long extended = *reloc;
255 extended += map;
256
257 ptr = (unsigned long)extended;
258 if (ptr < min_addr || ptr > max_addr)
259 error("64-bit relocation outside of kernel!\n");
260
261 *(uint64_t *)ptr += delta;
262 }
263#endif
264}
265#else
266static inline void handle_relocations(void *output, unsigned long output_len,
267 unsigned long virt_addr)
268{ }
269#endif
270
271static void parse_elf(void *output)
272{
273#ifdef CONFIG_X86_64
274 Elf64_Ehdr ehdr;
275 Elf64_Phdr *phdrs, *phdr;
276#else
277 Elf32_Ehdr ehdr;
278 Elf32_Phdr *phdrs, *phdr;
279#endif
280 void *dest;
281 int i;
282
283 memcpy(&ehdr, output, sizeof(ehdr));
284 if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
285 ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
286 ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
287 ehdr.e_ident[EI_MAG3] != ELFMAG3) {
288 error("Kernel is not a valid ELF file");
289 return;
290 }
291
292 debug_putstr("Parsing ELF... ");
293
294 phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
295 if (!phdrs)
296 error("Failed to allocate space for phdrs");
297
298 memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
299
300 for (i = 0; i < ehdr.e_phnum; i++) {
301 phdr = &phdrs[i];
302
303 switch (phdr->p_type) {
304 case PT_LOAD:
305#ifdef CONFIG_X86_64
306 if ((phdr->p_align % 0x200000) != 0)
307 error("Alignment of LOAD segment isn't multiple of 2MB");
308#endif
309#ifdef CONFIG_RELOCATABLE
310 dest = output;
311 dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
312#else
313 dest = (void *)(phdr->p_paddr);
314#endif
315 memmove(dest, output + phdr->p_offset, phdr->p_filesz);
316 break;
317 default: /* Ignore other PT_* */ break;
318 }
319 }
320
321 free(phdrs);
322}
323
324/*
325 * The compressed kernel image (ZO), has been moved so that its position
326 * is against the end of the buffer used to hold the uncompressed kernel
327 * image (VO) and the execution environment (.bss, .brk), which makes sure
328 * there is room to do the in-place decompression. (See header.S for the
329 * calculations.)
330 *
331 * |-----compressed kernel image------|
332 * V V
333 * 0 extract_offset +INIT_SIZE
334 * |-----------|---------------|-------------------------|--------|
335 * | | | |
336 * VO__text startup_32 of ZO VO__end ZO__end
337 * ^ ^
338 * |-------uncompressed kernel image---------|
339 *
340 */
341asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
342 unsigned char *input_data,
343 unsigned long input_len,
344 unsigned char *output,
345 unsigned long output_len)
346{
347 const unsigned long kernel_total_size = VO__end - VO__text;
348 unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
349 unsigned long needed_size;
350
351 /* Retain x86 boot parameters pointer passed from startup_32/64. */
352 boot_params = rmode;
353
354 /* Clear flags intended for solely in-kernel use. */
355 boot_params->hdr.loadflags &= ~KASLR_FLAG;
356
357 sanitize_boot_params(boot_params);
358
359 if (boot_params->screen_info.orig_video_mode == 7) {
360 vidmem = (char *) 0xb0000;
361 vidport = 0x3b4;
362 } else {
363 vidmem = (char *) 0xb8000;
364 vidport = 0x3d4;
365 }
366
367 lines = boot_params->screen_info.orig_video_lines;
368 cols = boot_params->screen_info.orig_video_cols;
369
370 console_init();
371
372 /*
373 * Save RSDP address for later use. Have this after console_init()
374 * so that early debugging output from the RSDP parsing code can be
375 * collected.
376 */
377 boot_params->acpi_rsdp_addr = get_rsdp_addr();
378
379 debug_putstr("early console in extract_kernel\n");
380
381 free_mem_ptr = heap; /* Heap */
382 free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
383
384 /*
385 * The memory hole needed for the kernel is the larger of either
386 * the entire decompressed kernel plus relocation table, or the
387 * entire decompressed kernel plus .bss and .brk sections.
388 *
389 * On X86_64, the memory is mapped with PMD pages. Round the
390 * size up so that the full extent of PMD pages mapped is
391 * included in the check against the valid memory table
392 * entries. This ensures the full mapped area is usable RAM
393 * and doesn't include any reserved areas.
394 */
395 needed_size = max(output_len, kernel_total_size);
396#ifdef CONFIG_X86_64
397 needed_size = ALIGN(needed_size, MIN_KERNEL_ALIGN);
398#endif
399
400 /* Report initial kernel position details. */
401 debug_putaddr(input_data);
402 debug_putaddr(input_len);
403 debug_putaddr(output);
404 debug_putaddr(output_len);
405 debug_putaddr(kernel_total_size);
406 debug_putaddr(needed_size);
407
408#ifdef CONFIG_X86_64
409 /* Report address of 32-bit trampoline */
410 debug_putaddr(trampoline_32bit);
411#endif
412
413 choose_random_location((unsigned long)input_data, input_len,
414 (unsigned long *)&output,
415 needed_size,
416 &virt_addr);
417
418 /* Validate memory location choices. */
419 if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
420 error("Destination physical address inappropriately aligned");
421 if (virt_addr & (MIN_KERNEL_ALIGN - 1))
422 error("Destination virtual address inappropriately aligned");
423#ifdef CONFIG_X86_64
424 if (heap > 0x3fffffffffffUL)
425 error("Destination address too large");
426 if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE)
427 error("Destination virtual address is beyond the kernel mapping area");
428#else
429 if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
430 error("Destination address too large");
431#endif
432#ifndef CONFIG_RELOCATABLE
433 if (virt_addr != LOAD_PHYSICAL_ADDR)
434 error("Destination virtual address changed when not relocatable");
435#endif
436
437 debug_putstr("\nDecompressing Linux... ");
438 __decompress(input_data, input_len, NULL, NULL, output, output_len,
439 NULL, error);
440 parse_elf(output);
441 handle_relocations(output, output_len, virt_addr);
442 debug_putstr("done.\nBooting the kernel.\n");
443
444 /* Disable exception handling before booting the kernel */
445 cleanup_exception_handling();
446
447 return output;
448}
449
450void fortify_panic(const char *name)
451{
452 error("detected buffer overflow");
453}