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Commit | Line | Data |
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31e31b8a FB |
1 | /* This is the Linux kernel elf-loading code, ported into user space */ |
2 | ||
3 | #include <stdio.h> | |
4 | #include <sys/types.h> | |
5 | #include <fcntl.h> | |
6 | #include <sys/stat.h> | |
7 | #include <errno.h> | |
8 | #include <unistd.h> | |
9 | #include <sys/mman.h> | |
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | ||
13 | #include "gemu.h" | |
14 | ||
15 | #include "linux_bin.h" | |
16 | #include "elf.h" | |
17 | #include "segment.h" | |
18 | ||
19 | /* Necessary parameters */ | |
20 | #define ALPHA_PAGE_SIZE 4096 | |
21 | #define X86_PAGE_SIZE 4096 | |
22 | ||
23 | #define ALPHA_PAGE_MASK (~(ALPHA_PAGE_SIZE-1)) | |
24 | #define X86_PAGE_MASK (~(X86_PAGE_SIZE-1)) | |
25 | ||
26 | #define ALPHA_PAGE_ALIGN(addr) ((((addr)+ALPHA_PAGE_SIZE)-1)&ALPHA_PAGE_MASK) | |
27 | #define X86_PAGE_ALIGN(addr) ((((addr)+X86_PAGE_SIZE)-1)&X86_PAGE_MASK) | |
28 | ||
29 | #define NGROUPS 32 | |
30 | ||
31 | #define X86_ELF_EXEC_PAGESIZE X86_PAGE_SIZE | |
32 | #define X86_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(X86_ELF_EXEC_PAGESIZE-1)) | |
33 | #define X86_ELF_PAGEOFFSET(_v) ((_v) & (X86_ELF_EXEC_PAGESIZE-1)) | |
34 | ||
35 | #define ALPHA_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ALPHA_PAGE_SIZE-1)) | |
36 | #define ALPHA_ELF_PAGEOFFSET(_v) ((_v) & (ALPHA_PAGE_SIZE-1)) | |
37 | ||
38 | #define INTERPRETER_NONE 0 | |
39 | #define INTERPRETER_AOUT 1 | |
40 | #define INTERPRETER_ELF 2 | |
41 | ||
42 | #define DLINFO_ITEMS 12 | |
43 | ||
44 | /* Where we find X86 libraries... */ | |
45 | //#define X86_DEFAULT_LIB_DIR "/usr/x86/" | |
46 | #define X86_DEFAULT_LIB_DIR "/" | |
47 | ||
48 | //extern void * mmap4k(); | |
49 | #define mmap4k(a, b, c, d, e, f) mmap((void *)(a), b, c, d, e, f) | |
50 | ||
51 | extern unsigned long x86_stack_size; | |
52 | ||
53 | static int load_aout_interp(void * exptr, int interp_fd); | |
54 | ||
55 | #ifdef BSWAP_NEEDED | |
56 | static void bswap_ehdr(Elf32_Ehdr *ehdr) | |
57 | { | |
58 | bswap16s(&ehdr->e_type); /* Object file type */ | |
59 | bswap16s(&ehdr->e_machine); /* Architecture */ | |
60 | bswap32s(&ehdr->e_version); /* Object file version */ | |
61 | bswap32s(&ehdr->e_entry); /* Entry point virtual address */ | |
62 | bswap32s(&ehdr->e_phoff); /* Program header table file offset */ | |
63 | bswap32s(&ehdr->e_shoff); /* Section header table file offset */ | |
64 | bswap32s(&ehdr->e_flags); /* Processor-specific flags */ | |
65 | bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ | |
66 | bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ | |
67 | bswap16s(&ehdr->e_phnum); /* Program header table entry count */ | |
68 | bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ | |
69 | bswap16s(&ehdr->e_shnum); /* Section header table entry count */ | |
70 | bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ | |
71 | } | |
72 | ||
73 | static void bswap_phdr(Elf32_Phdr *phdr) | |
74 | { | |
75 | bswap32s(&phdr->p_type); /* Segment type */ | |
76 | bswap32s(&phdr->p_offset); /* Segment file offset */ | |
77 | bswap32s(&phdr->p_vaddr); /* Segment virtual address */ | |
78 | bswap32s(&phdr->p_paddr); /* Segment physical address */ | |
79 | bswap32s(&phdr->p_filesz); /* Segment size in file */ | |
80 | bswap32s(&phdr->p_memsz); /* Segment size in memory */ | |
81 | bswap32s(&phdr->p_flags); /* Segment flags */ | |
82 | bswap32s(&phdr->p_align); /* Segment alignment */ | |
83 | } | |
84 | #endif | |
85 | ||
86 | static void * get_free_page(void) | |
87 | { | |
88 | void * retval; | |
89 | ||
90 | /* User-space version of kernel get_free_page. Returns a page-aligned | |
91 | * page-sized chunk of memory. | |
92 | */ | |
93 | retval = mmap4k(0, ALPHA_PAGE_SIZE, PROT_READ|PROT_WRITE, | |
94 | MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
95 | ||
96 | if((long)retval == -1) { | |
97 | perror("get_free_page"); | |
98 | exit(-1); | |
99 | } | |
100 | else { | |
101 | return(retval); | |
102 | } | |
103 | } | |
104 | ||
105 | static void free_page(void * pageaddr) | |
106 | { | |
107 | (void)munmap(pageaddr, ALPHA_PAGE_SIZE); | |
108 | } | |
109 | ||
110 | /* | |
111 | * 'copy_string()' copies argument/envelope strings from user | |
112 | * memory to free pages in kernel mem. These are in a format ready | |
113 | * to be put directly into the top of new user memory. | |
114 | * | |
115 | */ | |
116 | static unsigned long copy_strings(int argc,char ** argv,unsigned long *page, | |
117 | unsigned long p) | |
118 | { | |
119 | char *tmp, *tmp1, *pag = NULL; | |
120 | int len, offset = 0; | |
121 | ||
122 | if (!p) { | |
123 | return 0; /* bullet-proofing */ | |
124 | } | |
125 | while (argc-- > 0) { | |
126 | if (!(tmp1 = tmp = get_user(argv+argc))) { | |
127 | fprintf(stderr, "VFS: argc is wrong"); | |
128 | exit(-1); | |
129 | } | |
130 | while (get_user(tmp++)); | |
131 | len = tmp - tmp1; | |
132 | if (p < len) { /* this shouldn't happen - 128kB */ | |
133 | return 0; | |
134 | } | |
135 | while (len) { | |
136 | --p; --tmp; --len; | |
137 | if (--offset < 0) { | |
138 | offset = p % X86_PAGE_SIZE; | |
139 | if (!(pag = (char *) page[p/X86_PAGE_SIZE]) && | |
140 | !(pag = (char *) page[p/X86_PAGE_SIZE] = | |
141 | (unsigned long *) get_free_page())) { | |
142 | return 0; | |
143 | } | |
144 | } | |
145 | if (len == 0 || offset == 0) { | |
146 | *(pag + offset) = get_user(tmp); | |
147 | } | |
148 | else { | |
149 | int bytes_to_copy = (len > offset) ? offset : len; | |
150 | tmp -= bytes_to_copy; | |
151 | p -= bytes_to_copy; | |
152 | offset -= bytes_to_copy; | |
153 | len -= bytes_to_copy; | |
154 | memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); | |
155 | } | |
156 | } | |
157 | } | |
158 | return p; | |
159 | } | |
160 | ||
161 | static int in_group_p(gid_t g) | |
162 | { | |
163 | /* return TRUE if we're in the specified group, FALSE otherwise */ | |
164 | int ngroup; | |
165 | int i; | |
166 | gid_t grouplist[NGROUPS]; | |
167 | ||
168 | ngroup = getgroups(NGROUPS, grouplist); | |
169 | for(i = 0; i < ngroup; i++) { | |
170 | if(grouplist[i] == g) { | |
171 | return 1; | |
172 | } | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static int count(char ** vec) | |
178 | { | |
179 | int i; | |
180 | ||
181 | for(i = 0; *vec; i++) { | |
182 | vec++; | |
183 | } | |
184 | ||
185 | return(i); | |
186 | } | |
187 | ||
188 | static int prepare_binprm(struct linux_binprm *bprm) | |
189 | { | |
190 | struct stat st; | |
191 | int mode; | |
192 | int retval, id_change; | |
193 | ||
194 | if(fstat(bprm->fd, &st) < 0) { | |
195 | return(-errno); | |
196 | } | |
197 | ||
198 | mode = st.st_mode; | |
199 | if(!S_ISREG(mode)) { /* Must be regular file */ | |
200 | return(-EACCES); | |
201 | } | |
202 | if(!(mode & 0111)) { /* Must have at least one execute bit set */ | |
203 | return(-EACCES); | |
204 | } | |
205 | ||
206 | bprm->e_uid = geteuid(); | |
207 | bprm->e_gid = getegid(); | |
208 | id_change = 0; | |
209 | ||
210 | /* Set-uid? */ | |
211 | if(mode & S_ISUID) { | |
212 | bprm->e_uid = st.st_uid; | |
213 | if(bprm->e_uid != geteuid()) { | |
214 | id_change = 1; | |
215 | } | |
216 | } | |
217 | ||
218 | /* Set-gid? */ | |
219 | /* | |
220 | * If setgid is set but no group execute bit then this | |
221 | * is a candidate for mandatory locking, not a setgid | |
222 | * executable. | |
223 | */ | |
224 | if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { | |
225 | bprm->e_gid = st.st_gid; | |
226 | if (!in_group_p(bprm->e_gid)) { | |
227 | id_change = 1; | |
228 | } | |
229 | } | |
230 | ||
231 | memset(bprm->buf, 0, sizeof(bprm->buf)); | |
232 | retval = lseek(bprm->fd, 0L, SEEK_SET); | |
233 | if(retval >= 0) { | |
234 | retval = read(bprm->fd, bprm->buf, 128); | |
235 | } | |
236 | if(retval < 0) { | |
237 | perror("prepare_binprm"); | |
238 | exit(-1); | |
239 | /* return(-errno); */ | |
240 | } | |
241 | else { | |
242 | return(retval); | |
243 | } | |
244 | } | |
245 | ||
246 | unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, | |
247 | struct image_info * info) | |
248 | { | |
249 | unsigned long stack_base; | |
250 | int i; | |
251 | extern unsigned long stktop; | |
252 | ||
253 | stack_base = X86_STACK_TOP - MAX_ARG_PAGES*X86_PAGE_SIZE; | |
254 | ||
255 | p += stack_base; | |
256 | if (bprm->loader) { | |
257 | bprm->loader += stack_base; | |
258 | } | |
259 | bprm->exec += stack_base; | |
260 | ||
261 | /* Create enough stack to hold everything. If we don't use | |
262 | * it for args, we'll use it for something else... | |
263 | */ | |
9de5e440 FB |
264 | /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so |
265 | we allocate a bigger stack. Need a better solution, for example | |
266 | by remapping the process stack directly at the right place */ | |
31e31b8a FB |
267 | if(x86_stack_size > MAX_ARG_PAGES*X86_PAGE_SIZE) { |
268 | if((long)mmap4k((void *)(X86_STACK_TOP-x86_stack_size), x86_stack_size + X86_PAGE_SIZE, | |
269 | PROT_READ | PROT_WRITE, | |
270 | MAP_GROWSDOWN | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { | |
271 | perror("stk mmap"); | |
272 | exit(-1); | |
273 | } | |
274 | } | |
275 | else { | |
276 | if((long)mmap4k((void *)stack_base, (MAX_ARG_PAGES+1)*X86_PAGE_SIZE, | |
277 | PROT_READ | PROT_WRITE, | |
278 | MAP_GROWSDOWN | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { | |
279 | perror("stk mmap"); | |
280 | exit(-1); | |
281 | } | |
282 | } | |
283 | ||
284 | stktop = stack_base; | |
285 | ||
286 | for (i = 0 ; i < MAX_ARG_PAGES ; i++) { | |
287 | if (bprm->page[i]) { | |
288 | info->rss++; | |
289 | ||
290 | memcpy((void *)stack_base, (void *)bprm->page[i], X86_PAGE_SIZE); | |
291 | free_page((void *)bprm->page[i]); | |
292 | } | |
293 | stack_base += X86_PAGE_SIZE; | |
294 | } | |
295 | return p; | |
296 | } | |
297 | ||
298 | static void set_brk(unsigned long start, unsigned long end) | |
299 | { | |
300 | /* page-align the start and end addresses... */ | |
301 | start = ALPHA_PAGE_ALIGN(start); | |
302 | end = ALPHA_PAGE_ALIGN(end); | |
303 | if (end <= start) | |
304 | return; | |
305 | if((long)mmap4k(start, end - start, | |
306 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
307 | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { | |
308 | perror("cannot mmap brk"); | |
309 | exit(-1); | |
310 | } | |
311 | } | |
312 | ||
313 | ||
314 | /* We need to explicitly zero any fractional pages | |
315 | after the data section (i.e. bss). This would | |
316 | contain the junk from the file that should not | |
317 | be in memory */ | |
318 | ||
319 | ||
320 | static void padzero(unsigned long elf_bss) | |
321 | { | |
322 | unsigned long nbyte; | |
323 | char * fpnt; | |
324 | ||
325 | nbyte = elf_bss & (ALPHA_PAGE_SIZE-1); /* was X86_PAGE_SIZE - JRP */ | |
326 | if (nbyte) { | |
327 | nbyte = ALPHA_PAGE_SIZE - nbyte; | |
328 | fpnt = (char *) elf_bss; | |
329 | do { | |
330 | *fpnt++ = 0; | |
331 | } while (--nbyte); | |
332 | } | |
333 | } | |
334 | ||
335 | static unsigned int * create_elf_tables(char *p, int argc, int envc, | |
336 | struct elfhdr * exec, | |
337 | unsigned long load_addr, | |
338 | unsigned long interp_load_addr, int ibcs, | |
339 | struct image_info *info) | |
340 | { | |
b17780d5 FB |
341 | target_ulong *argv, *envp, *dlinfo; |
342 | target_ulong *sp; | |
31e31b8a FB |
343 | |
344 | /* | |
345 | * Force 16 byte alignment here for generality. | |
346 | */ | |
347 | sp = (unsigned int *) (~15UL & (unsigned long) p); | |
348 | sp -= exec ? DLINFO_ITEMS*2 : 2; | |
349 | dlinfo = sp; | |
350 | sp -= envc+1; | |
351 | envp = sp; | |
352 | sp -= argc+1; | |
353 | argv = sp; | |
354 | if (!ibcs) { | |
b17780d5 FB |
355 | put_user(tswapl((target_ulong)envp),--sp); |
356 | put_user(tswapl((target_ulong)argv),--sp); | |
31e31b8a | 357 | } |
31e31b8a FB |
358 | |
359 | #define NEW_AUX_ENT(id, val) \ | |
b17780d5 FB |
360 | put_user (tswapl(id), dlinfo++); \ |
361 | put_user (tswapl(val), dlinfo++) | |
31e31b8a FB |
362 | |
363 | if (exec) { /* Put this here for an ELF program interpreter */ | |
364 | struct elf_phdr * eppnt; | |
365 | eppnt = (struct elf_phdr *)((unsigned long)exec->e_phoff); | |
366 | ||
367 | NEW_AUX_ENT (AT_PHDR, (unsigned int)(load_addr + exec->e_phoff)); | |
368 | NEW_AUX_ENT (AT_PHENT, (unsigned int)(sizeof (struct elf_phdr))); | |
369 | NEW_AUX_ENT (AT_PHNUM, (unsigned int)(exec->e_phnum)); | |
370 | NEW_AUX_ENT (AT_PAGESZ, (unsigned int)(ALPHA_PAGE_SIZE)); | |
371 | NEW_AUX_ENT (AT_BASE, (unsigned int)(interp_load_addr)); | |
372 | NEW_AUX_ENT (AT_FLAGS, (unsigned int)0); | |
373 | NEW_AUX_ENT (AT_ENTRY, (unsigned int) exec->e_entry); | |
374 | NEW_AUX_ENT (AT_UID, (unsigned int) getuid()); | |
375 | NEW_AUX_ENT (AT_EUID, (unsigned int) geteuid()); | |
376 | NEW_AUX_ENT (AT_GID, (unsigned int) getgid()); | |
377 | NEW_AUX_ENT (AT_EGID, (unsigned int) getegid()); | |
378 | } | |
379 | NEW_AUX_ENT (AT_NULL, 0); | |
380 | #undef NEW_AUX_ENT | |
b17780d5 | 381 | put_user(tswapl(argc),--sp); |
31e31b8a FB |
382 | info->arg_start = (unsigned int)((unsigned long)p & 0xffffffff); |
383 | while (argc-->0) { | |
b17780d5 | 384 | put_user(tswapl((target_ulong)p),argv++); |
31e31b8a FB |
385 | while (get_user(p++)) /* nothing */ ; |
386 | } | |
387 | put_user(0,argv); | |
388 | info->arg_end = info->env_start = (unsigned int)((unsigned long)p & 0xffffffff); | |
31e31b8a | 389 | while (envc-->0) { |
b17780d5 | 390 | put_user(tswapl((target_ulong)p),envp++); |
31e31b8a FB |
391 | while (get_user(p++)) /* nothing */ ; |
392 | } | |
393 | put_user(0,envp); | |
31e31b8a FB |
394 | info->env_end = (unsigned int)((unsigned long)p & 0xffffffff); |
395 | return sp; | |
396 | } | |
397 | ||
398 | ||
399 | ||
400 | static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, | |
401 | int interpreter_fd, | |
402 | unsigned long *interp_load_addr) | |
403 | { | |
404 | struct elf_phdr *elf_phdata = NULL; | |
405 | struct elf_phdr *eppnt; | |
406 | unsigned long load_addr; | |
407 | int load_addr_set = 0; | |
408 | int retval; | |
409 | unsigned long last_bss, elf_bss; | |
410 | unsigned long error; | |
411 | int i; | |
412 | ||
413 | elf_bss = 0; | |
414 | last_bss = 0; | |
415 | error = 0; | |
416 | ||
417 | /* We put this here so that mmap will search for the *first* | |
418 | * available memory... | |
419 | */ | |
420 | load_addr = INTERP_LOADADDR; | |
421 | ||
422 | /* First of all, some simple consistency checks */ | |
423 | if ((interp_elf_ex->e_type != ET_EXEC && | |
424 | interp_elf_ex->e_type != ET_DYN) || | |
425 | !elf_check_arch(interp_elf_ex->e_machine)) { | |
426 | return ~0UL; | |
427 | } | |
428 | ||
429 | /* Now read in all of the header information */ | |
430 | ||
431 | if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > X86_PAGE_SIZE) | |
432 | return ~0UL; | |
433 | ||
434 | elf_phdata = (struct elf_phdr *) | |
435 | malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
436 | ||
437 | if (!elf_phdata) | |
438 | return ~0UL; | |
439 | ||
440 | /* | |
441 | * If the size of this structure has changed, then punt, since | |
442 | * we will be doing the wrong thing. | |
443 | */ | |
444 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
445 | { | |
446 | free(elf_phdata); | |
447 | return ~0UL; | |
448 | } | |
449 | ||
450 | retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); | |
451 | if(retval >= 0) { | |
452 | retval = read(interpreter_fd, | |
453 | (char *) elf_phdata, | |
454 | sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
455 | } | |
456 | ||
457 | if (retval < 0) { | |
458 | perror("load_elf_interp"); | |
459 | exit(-1); | |
460 | free (elf_phdata); | |
461 | return retval; | |
462 | } | |
463 | #ifdef BSWAP_NEEDED | |
464 | eppnt = elf_phdata; | |
465 | for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { | |
466 | bswap_phdr(eppnt); | |
467 | } | |
468 | #endif | |
469 | eppnt = elf_phdata; | |
470 | for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) | |
471 | if (eppnt->p_type == PT_LOAD) { | |
472 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
473 | int elf_prot = 0; | |
474 | unsigned long vaddr = 0; | |
475 | unsigned long k; | |
476 | ||
477 | if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; | |
478 | if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
479 | if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
480 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) { | |
481 | elf_type |= MAP_FIXED; | |
482 | vaddr = eppnt->p_vaddr; | |
483 | } | |
484 | error = (unsigned long)mmap4k(load_addr+X86_ELF_PAGESTART(vaddr), | |
485 | eppnt->p_filesz + X86_ELF_PAGEOFFSET(eppnt->p_vaddr), | |
486 | elf_prot, | |
487 | elf_type, | |
488 | interpreter_fd, | |
489 | eppnt->p_offset - X86_ELF_PAGEOFFSET(eppnt->p_vaddr)); | |
490 | ||
491 | if (error > -1024UL) { | |
492 | /* Real error */ | |
493 | close(interpreter_fd); | |
494 | free(elf_phdata); | |
495 | return ~0UL; | |
496 | } | |
497 | ||
498 | if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { | |
499 | load_addr = error; | |
500 | load_addr_set = 1; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Find the end of the file mapping for this phdr, and keep | |
505 | * track of the largest address we see for this. | |
506 | */ | |
507 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
508 | if (k > elf_bss) elf_bss = k; | |
509 | ||
510 | /* | |
511 | * Do the same thing for the memory mapping - between | |
512 | * elf_bss and last_bss is the bss section. | |
513 | */ | |
514 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
515 | if (k > last_bss) last_bss = k; | |
516 | } | |
517 | ||
518 | /* Now use mmap to map the library into memory. */ | |
519 | ||
520 | close(interpreter_fd); | |
521 | ||
522 | /* | |
523 | * Now fill out the bss section. First pad the last page up | |
524 | * to the page boundary, and then perform a mmap to make sure | |
525 | * that there are zeromapped pages up to and including the last | |
526 | * bss page. | |
527 | */ | |
528 | padzero(elf_bss); | |
529 | elf_bss = X86_ELF_PAGESTART(elf_bss + ALPHA_PAGE_SIZE - 1); /* What we have mapped so far */ | |
530 | ||
531 | /* Map the last of the bss segment */ | |
532 | if (last_bss > elf_bss) { | |
533 | mmap4k(elf_bss, last_bss-elf_bss, | |
534 | PROT_READ|PROT_WRITE|PROT_EXEC, | |
535 | MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
536 | } | |
537 | free(elf_phdata); | |
538 | ||
539 | *interp_load_addr = load_addr; | |
540 | return ((unsigned long) interp_elf_ex->e_entry) + load_addr; | |
541 | } | |
542 | ||
543 | ||
544 | ||
b17780d5 FB |
545 | static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
546 | struct image_info * info) | |
31e31b8a FB |
547 | { |
548 | struct elfhdr elf_ex; | |
549 | struct elfhdr interp_elf_ex; | |
550 | struct exec interp_ex; | |
551 | int interpreter_fd = -1; /* avoid warning */ | |
552 | unsigned long load_addr; | |
553 | int load_addr_set = 0; | |
554 | unsigned int interpreter_type = INTERPRETER_NONE; | |
555 | unsigned char ibcs2_interpreter; | |
556 | int i; | |
557 | void * mapped_addr; | |
558 | struct elf_phdr * elf_ppnt; | |
559 | struct elf_phdr *elf_phdata; | |
560 | unsigned long elf_bss, k, elf_brk; | |
561 | int retval; | |
562 | char * elf_interpreter; | |
563 | unsigned long elf_entry, interp_load_addr = 0; | |
564 | int status; | |
565 | unsigned long start_code, end_code, end_data; | |
566 | unsigned long elf_stack; | |
567 | char passed_fileno[6]; | |
568 | ||
569 | ibcs2_interpreter = 0; | |
570 | status = 0; | |
571 | load_addr = 0; | |
572 | elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ | |
573 | #ifdef BSWAP_NEEDED | |
574 | bswap_ehdr(&elf_ex); | |
575 | #endif | |
576 | ||
577 | if (elf_ex.e_ident[0] != 0x7f || | |
578 | strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) { | |
579 | return -ENOEXEC; | |
580 | } | |
581 | ||
31e31b8a FB |
582 | /* First of all, some simple consistency checks */ |
583 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || | |
584 | (! elf_check_arch(elf_ex.e_machine))) { | |
585 | return -ENOEXEC; | |
586 | } | |
587 | ||
588 | /* Now read in all of the header information */ | |
589 | ||
590 | elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum); | |
591 | if (elf_phdata == NULL) { | |
592 | return -ENOMEM; | |
593 | } | |
594 | ||
595 | retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); | |
596 | if(retval > 0) { | |
597 | retval = read(bprm->fd, (char *) elf_phdata, | |
598 | elf_ex.e_phentsize * elf_ex.e_phnum); | |
599 | } | |
600 | ||
601 | if (retval < 0) { | |
602 | perror("load_elf_binary"); | |
603 | exit(-1); | |
604 | free (elf_phdata); | |
605 | return -errno; | |
606 | } | |
607 | ||
b17780d5 FB |
608 | #ifdef BSWAP_NEEDED |
609 | elf_ppnt = elf_phdata; | |
610 | for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { | |
611 | bswap_phdr(elf_ppnt); | |
612 | } | |
613 | #endif | |
31e31b8a FB |
614 | elf_ppnt = elf_phdata; |
615 | ||
616 | elf_bss = 0; | |
617 | elf_brk = 0; | |
618 | ||
619 | ||
620 | elf_stack = ~0UL; | |
621 | elf_interpreter = NULL; | |
622 | start_code = ~0UL; | |
623 | end_code = 0; | |
624 | end_data = 0; | |
625 | ||
626 | for(i=0;i < elf_ex.e_phnum; i++) { | |
627 | if (elf_ppnt->p_type == PT_INTERP) { | |
628 | if ( elf_interpreter != NULL ) | |
629 | { | |
630 | free (elf_phdata); | |
631 | free(elf_interpreter); | |
632 | close(bprm->fd); | |
633 | return -EINVAL; | |
634 | } | |
635 | ||
636 | /* This is the program interpreter used for | |
637 | * shared libraries - for now assume that this | |
638 | * is an a.out format binary | |
639 | */ | |
640 | ||
641 | elf_interpreter = (char *)malloc(elf_ppnt->p_filesz+strlen(X86_DEFAULT_LIB_DIR)); | |
642 | ||
643 | if (elf_interpreter == NULL) { | |
644 | free (elf_phdata); | |
645 | close(bprm->fd); | |
646 | return -ENOMEM; | |
647 | } | |
648 | ||
649 | strcpy(elf_interpreter, X86_DEFAULT_LIB_DIR); | |
650 | retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); | |
651 | if(retval >= 0) { | |
652 | retval = read(bprm->fd, | |
653 | elf_interpreter+strlen(X86_DEFAULT_LIB_DIR), | |
654 | elf_ppnt->p_filesz); | |
655 | } | |
656 | if(retval < 0) { | |
657 | perror("load_elf_binary2"); | |
658 | exit(-1); | |
659 | } | |
660 | ||
661 | /* If the program interpreter is one of these two, | |
662 | then assume an iBCS2 image. Otherwise assume | |
663 | a native linux image. */ | |
664 | ||
665 | /* JRP - Need to add X86 lib dir stuff here... */ | |
666 | ||
667 | if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || | |
668 | strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { | |
669 | ibcs2_interpreter = 1; | |
670 | } | |
671 | ||
672 | #if 0 | |
673 | printf("Using ELF interpreter %s\n", elf_interpreter); | |
674 | #endif | |
675 | if (retval >= 0) { | |
676 | retval = open(elf_interpreter, O_RDONLY); | |
677 | if(retval >= 0) { | |
678 | interpreter_fd = retval; | |
679 | } | |
680 | else { | |
681 | perror(elf_interpreter); | |
682 | exit(-1); | |
683 | /* retval = -errno; */ | |
684 | } | |
685 | } | |
686 | ||
687 | if (retval >= 0) { | |
688 | retval = lseek(interpreter_fd, 0, SEEK_SET); | |
689 | if(retval >= 0) { | |
690 | retval = read(interpreter_fd,bprm->buf,128); | |
691 | } | |
692 | } | |
693 | if (retval >= 0) { | |
694 | interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ | |
695 | interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */ | |
696 | } | |
697 | if (retval < 0) { | |
698 | perror("load_elf_binary3"); | |
699 | exit(-1); | |
700 | free (elf_phdata); | |
701 | free(elf_interpreter); | |
702 | close(bprm->fd); | |
703 | return retval; | |
704 | } | |
705 | } | |
706 | elf_ppnt++; | |
707 | } | |
708 | ||
709 | /* Some simple consistency checks for the interpreter */ | |
710 | if (elf_interpreter){ | |
711 | interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; | |
712 | ||
713 | /* Now figure out which format our binary is */ | |
714 | if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) && | |
715 | (N_MAGIC(interp_ex) != QMAGIC)) { | |
716 | interpreter_type = INTERPRETER_ELF; | |
717 | } | |
718 | ||
719 | if (interp_elf_ex.e_ident[0] != 0x7f || | |
720 | strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) { | |
721 | interpreter_type &= ~INTERPRETER_ELF; | |
722 | } | |
723 | ||
724 | if (!interpreter_type) { | |
725 | free(elf_interpreter); | |
726 | free(elf_phdata); | |
727 | close(bprm->fd); | |
728 | return -ELIBBAD; | |
729 | } | |
730 | } | |
731 | ||
732 | /* OK, we are done with that, now set up the arg stuff, | |
733 | and then start this sucker up */ | |
734 | ||
735 | if (!bprm->sh_bang) { | |
736 | char * passed_p; | |
737 | ||
738 | if (interpreter_type == INTERPRETER_AOUT) { | |
739 | sprintf(passed_fileno, "%d", bprm->fd); | |
740 | passed_p = passed_fileno; | |
741 | ||
742 | if (elf_interpreter) { | |
743 | bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p); | |
744 | bprm->argc++; | |
745 | } | |
746 | } | |
747 | if (!bprm->p) { | |
748 | if (elf_interpreter) { | |
749 | free(elf_interpreter); | |
750 | } | |
751 | free (elf_phdata); | |
752 | close(bprm->fd); | |
753 | return -E2BIG; | |
754 | } | |
755 | } | |
756 | ||
757 | /* OK, This is the point of no return */ | |
758 | info->end_data = 0; | |
759 | info->end_code = 0; | |
760 | info->start_mmap = (unsigned long)ELF_START_MMAP; | |
761 | info->mmap = 0; | |
762 | elf_entry = (unsigned long) elf_ex.e_entry; | |
763 | ||
764 | /* Do this so that we can load the interpreter, if need be. We will | |
765 | change some of these later */ | |
766 | info->rss = 0; | |
767 | bprm->p = setup_arg_pages(bprm->p, bprm, info); | |
768 | info->start_stack = bprm->p; | |
769 | ||
770 | /* Now we do a little grungy work by mmaping the ELF image into | |
771 | * the correct location in memory. At this point, we assume that | |
772 | * the image should be loaded at fixed address, not at a variable | |
773 | * address. | |
774 | */ | |
775 | ||
776 | ||
777 | ||
778 | for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { | |
779 | if (elf_ppnt->p_type == PT_LOAD) { | |
780 | int elf_prot = 0; | |
781 | if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; | |
782 | if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
783 | if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
784 | ||
785 | mapped_addr = mmap4k(X86_ELF_PAGESTART(elf_ppnt->p_vaddr), | |
786 | (elf_ppnt->p_filesz + | |
787 | X86_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), | |
788 | elf_prot, | |
789 | (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), | |
790 | bprm->fd, | |
791 | (elf_ppnt->p_offset - | |
792 | X86_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); | |
793 | ||
794 | if((unsigned long)mapped_addr == 0xffffffffffffffff) { | |
795 | perror("mmap"); | |
796 | exit(-1); | |
797 | } | |
798 | ||
799 | ||
800 | ||
801 | #ifdef LOW_ELF_STACK | |
802 | if (X86_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) | |
803 | elf_stack = X86_ELF_PAGESTART(elf_ppnt->p_vaddr); | |
804 | #endif | |
805 | ||
806 | if (!load_addr_set) { | |
807 | load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; | |
808 | load_addr_set = 1; | |
809 | } | |
810 | k = elf_ppnt->p_vaddr; | |
811 | if (k < start_code) start_code = k; | |
812 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
813 | if (k > elf_bss) elf_bss = k; | |
814 | #if 1 | |
815 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
816 | #else | |
817 | if ( !(elf_ppnt->p_flags & PF_W) && end_code < k) | |
818 | #endif | |
819 | end_code = k; | |
820 | if (end_data < k) end_data = k; | |
821 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
822 | if (k > elf_brk) elf_brk = k; | |
823 | } | |
824 | } | |
825 | ||
826 | if (elf_interpreter) { | |
827 | if (interpreter_type & 1) { | |
828 | elf_entry = load_aout_interp(&interp_ex, interpreter_fd); | |
829 | } | |
830 | else if (interpreter_type & 2) { | |
831 | elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, | |
832 | &interp_load_addr); | |
833 | } | |
834 | ||
835 | close(interpreter_fd); | |
836 | free(elf_interpreter); | |
837 | ||
838 | if (elf_entry == ~0UL) { | |
839 | printf("Unable to load interpreter\n"); | |
840 | free(elf_phdata); | |
841 | exit(-1); | |
842 | return 0; | |
843 | } | |
844 | } | |
845 | ||
846 | free(elf_phdata); | |
847 | ||
848 | if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd); | |
849 | info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); | |
850 | ||
851 | #ifdef LOW_ELF_STACK | |
852 | info->start_stack = bprm->p = elf_stack - 4; | |
853 | #endif | |
854 | bprm->p = (unsigned long) | |
855 | create_elf_tables((char *)bprm->p, | |
856 | bprm->argc, | |
857 | bprm->envc, | |
858 | (interpreter_type == INTERPRETER_ELF ? &elf_ex : NULL), | |
859 | load_addr, | |
860 | interp_load_addr, | |
861 | (interpreter_type == INTERPRETER_AOUT ? 0 : 1), | |
862 | info); | |
863 | if (interpreter_type == INTERPRETER_AOUT) | |
864 | info->arg_start += strlen(passed_fileno) + 1; | |
865 | info->start_brk = info->brk = elf_brk; | |
866 | info->end_code = end_code; | |
867 | info->start_code = start_code; | |
868 | info->end_data = end_data; | |
869 | info->start_stack = bprm->p; | |
870 | ||
871 | /* Calling set_brk effectively mmaps the pages that we need for the bss and break | |
872 | sections */ | |
873 | set_brk(elf_bss, elf_brk); | |
874 | ||
875 | padzero(elf_bss); | |
876 | ||
877 | #if 0 | |
878 | printf("(start_brk) %x\n" , info->start_brk); | |
879 | printf("(end_code) %x\n" , info->end_code); | |
880 | printf("(start_code) %x\n" , info->start_code); | |
881 | printf("(end_data) %x\n" , info->end_data); | |
882 | printf("(start_stack) %x\n" , info->start_stack); | |
883 | printf("(brk) %x\n" , info->brk); | |
884 | #endif | |
885 | ||
886 | if ( info->personality == PER_SVR4 ) | |
887 | { | |
888 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
889 | and some applications "depend" upon this behavior. | |
890 | Since we do not have the power to recompile these, we | |
891 | emulate the SVr4 behavior. Sigh. */ | |
892 | mapped_addr = mmap4k(NULL, ALPHA_PAGE_SIZE, PROT_READ | PROT_EXEC, | |
893 | MAP_FIXED | MAP_PRIVATE, -1, 0); | |
894 | } | |
895 | ||
896 | #ifdef ELF_PLAT_INIT | |
897 | /* | |
898 | * The ABI may specify that certain registers be set up in special | |
899 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
900 | * example. This macro performs whatever initialization to | |
901 | * the regs structure is required. | |
902 | */ | |
903 | ELF_PLAT_INIT(regs); | |
904 | #endif | |
905 | ||
906 | ||
907 | info->entry = elf_entry; | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | ||
913 | ||
914 | int elf_exec(const char * filename, char ** argv, char ** envp, | |
b17780d5 | 915 | struct target_pt_regs * regs, struct image_info *infop) |
31e31b8a FB |
916 | { |
917 | struct linux_binprm bprm; | |
918 | int retval; | |
919 | int i; | |
920 | ||
921 | bprm.p = X86_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); | |
922 | for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */ | |
923 | bprm.page[i] = 0; | |
924 | retval = open(filename, O_RDONLY); | |
925 | if (retval == -1) { | |
926 | perror(filename); | |
927 | exit(-1); | |
928 | /* return retval; */ | |
929 | } | |
930 | else { | |
931 | bprm.fd = retval; | |
932 | } | |
933 | bprm.filename = (char *)filename; | |
934 | bprm.sh_bang = 0; | |
935 | bprm.loader = 0; | |
936 | bprm.exec = 0; | |
937 | bprm.dont_iput = 0; | |
938 | bprm.argc = count(argv); | |
939 | bprm.envc = count(envp); | |
940 | ||
941 | retval = prepare_binprm(&bprm); | |
942 | ||
943 | if(retval>=0) { | |
944 | bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p); | |
945 | bprm.exec = bprm.p; | |
946 | bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p); | |
947 | bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p); | |
948 | if (!bprm.p) { | |
949 | retval = -E2BIG; | |
950 | } | |
951 | } | |
952 | ||
953 | if(retval>=0) { | |
954 | retval = load_elf_binary(&bprm,regs,infop); | |
955 | } | |
956 | if(retval>=0) { | |
957 | /* success. Initialize important registers */ | |
958 | regs->esp = infop->start_stack; | |
959 | regs->eip = infop->entry; | |
960 | return retval; | |
961 | } | |
962 | ||
963 | /* Something went wrong, return the inode and free the argument pages*/ | |
964 | for (i=0 ; i<MAX_ARG_PAGES ; i++) { | |
965 | free_page((void *)bprm.page[i]); | |
966 | } | |
967 | return(retval); | |
968 | } | |
969 | ||
970 | ||
971 | static int load_aout_interp(void * exptr, int interp_fd) | |
972 | { | |
973 | printf("a.out interpreter not yet supported\n"); | |
974 | return(0); | |
975 | } | |
976 |