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Linux/fs/binfmt_elf_fdpic.c

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  1 /* binfmt_elf_fdpic.c: FDPIC ELF binary format
  2  *
  3  * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  * Derived from binfmt_elf.c
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version
 10  * 2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #include <linux/module.h>
 14 
 15 #include <linux/fs.h>
 16 #include <linux/stat.h>
 17 #include <linux/sched.h>
 18 #include <linux/mm.h>
 19 #include <linux/mman.h>
 20 #include <linux/errno.h>
 21 #include <linux/signal.h>
 22 #include <linux/binfmts.h>
 23 #include <linux/string.h>
 24 #include <linux/file.h>
 25 #include <linux/fcntl.h>
 26 #include <linux/slab.h>
 27 #include <linux/pagemap.h>
 28 #include <linux/security.h>
 29 #include <linux/highmem.h>
 30 #include <linux/highuid.h>
 31 #include <linux/personality.h>
 32 #include <linux/ptrace.h>
 33 #include <linux/init.h>
 34 #include <linux/elf.h>
 35 #include <linux/elf-fdpic.h>
 36 #include <linux/elfcore.h>
 37 #include <linux/coredump.h>
 38 #include <linux/dax.h>
 39 
 40 #include <asm/uaccess.h>
 41 #include <asm/param.h>
 42 #include <asm/pgalloc.h>
 43 
 44 typedef char *elf_caddr_t;
 45 
 46 #if 0
 47 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
 48 #else
 49 #define kdebug(fmt, ...) do {} while(0)
 50 #endif
 51 
 52 #if 0
 53 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
 54 #else
 55 #define kdcore(fmt, ...) do {} while(0)
 56 #endif
 57 
 58 MODULE_LICENSE("GPL");
 59 
 60 static int load_elf_fdpic_binary(struct linux_binprm *);
 61 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
 62 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
 63                               struct mm_struct *, const char *);
 64 
 65 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
 66                                    struct elf_fdpic_params *,
 67                                    struct elf_fdpic_params *);
 68 
 69 #ifndef CONFIG_MMU
 70 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
 71                                             unsigned long *);
 72 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
 73                                                    struct file *,
 74                                                    struct mm_struct *);
 75 #endif
 76 
 77 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
 78                                              struct file *, struct mm_struct *);
 79 
 80 #ifdef CONFIG_ELF_CORE
 81 static int elf_fdpic_core_dump(struct coredump_params *cprm);
 82 #endif
 83 
 84 static struct linux_binfmt elf_fdpic_format = {
 85         .module         = THIS_MODULE,
 86         .load_binary    = load_elf_fdpic_binary,
 87 #ifdef CONFIG_ELF_CORE
 88         .core_dump      = elf_fdpic_core_dump,
 89 #endif
 90         .min_coredump   = ELF_EXEC_PAGESIZE,
 91 };
 92 
 93 static int __init init_elf_fdpic_binfmt(void)
 94 {
 95         register_binfmt(&elf_fdpic_format);
 96         return 0;
 97 }
 98 
 99 static void __exit exit_elf_fdpic_binfmt(void)
100 {
101         unregister_binfmt(&elf_fdpic_format);
102 }
103 
104 core_initcall(init_elf_fdpic_binfmt);
105 module_exit(exit_elf_fdpic_binfmt);
106 
107 static int is_elf(struct elfhdr *hdr, struct file *file)
108 {
109         if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
110                 return 0;
111         if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
112                 return 0;
113         if (!elf_check_arch(hdr))
114                 return 0;
115         if (!file->f_op->mmap)
116                 return 0;
117         return 1;
118 }
119 
120 #ifndef elf_check_fdpic
121 #define elf_check_fdpic(x) 0
122 #endif
123 
124 #ifndef elf_check_const_displacement
125 #define elf_check_const_displacement(x) 0
126 #endif
127 
128 static int is_constdisp(struct elfhdr *hdr)
129 {
130         if (!elf_check_fdpic(hdr))
131                 return 1;
132         if (elf_check_const_displacement(hdr))
133                 return 1;
134         return 0;
135 }
136 
137 /*****************************************************************************/
138 /*
139  * read the program headers table into memory
140  */
141 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
142                                  struct file *file)
143 {
144         struct elf32_phdr *phdr;
145         unsigned long size;
146         int retval, loop;
147 
148         if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
149                 return -ENOMEM;
150         if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
151                 return -ENOMEM;
152 
153         size = params->hdr.e_phnum * sizeof(struct elf_phdr);
154         params->phdrs = kmalloc(size, GFP_KERNEL);
155         if (!params->phdrs)
156                 return -ENOMEM;
157 
158         retval = kernel_read(file, params->hdr.e_phoff,
159                              (char *) params->phdrs, size);
160         if (unlikely(retval != size))
161                 return retval < 0 ? retval : -ENOEXEC;
162 
163         /* determine stack size for this binary */
164         phdr = params->phdrs;
165         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
166                 if (phdr->p_type != PT_GNU_STACK)
167                         continue;
168 
169                 if (phdr->p_flags & PF_X)
170                         params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
171                 else
172                         params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
173 
174                 params->stack_size = phdr->p_memsz;
175                 break;
176         }
177 
178         return 0;
179 }
180 
181 /*****************************************************************************/
182 /*
183  * load an fdpic binary into various bits of memory
184  */
185 static int load_elf_fdpic_binary(struct linux_binprm *bprm)
186 {
187         struct elf_fdpic_params exec_params, interp_params;
188         struct pt_regs *regs = current_pt_regs();
189         struct elf_phdr *phdr;
190         unsigned long stack_size, entryaddr;
191 #ifdef ELF_FDPIC_PLAT_INIT
192         unsigned long dynaddr;
193 #endif
194 #ifndef CONFIG_MMU
195         unsigned long stack_prot;
196 #endif
197         struct file *interpreter = NULL; /* to shut gcc up */
198         char *interpreter_name = NULL;
199         int executable_stack;
200         int retval, i;
201 
202         kdebug("____ LOAD %d ____", current->pid);
203 
204         memset(&exec_params, 0, sizeof(exec_params));
205         memset(&interp_params, 0, sizeof(interp_params));
206 
207         exec_params.hdr = *(struct elfhdr *) bprm->buf;
208         exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
209 
210         /* check that this is a binary we know how to deal with */
211         retval = -ENOEXEC;
212         if (!is_elf(&exec_params.hdr, bprm->file))
213                 goto error;
214         if (!elf_check_fdpic(&exec_params.hdr)) {
215 #ifdef CONFIG_MMU
216                 /* binfmt_elf handles non-fdpic elf except on nommu */
217                 goto error;
218 #else
219                 /* nommu can only load ET_DYN (PIE) ELF */
220                 if (exec_params.hdr.e_type != ET_DYN)
221                         goto error;
222 #endif
223         }
224 
225         /* read the program header table */
226         retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
227         if (retval < 0)
228                 goto error;
229 
230         /* scan for a program header that specifies an interpreter */
231         phdr = exec_params.phdrs;
232 
233         for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
234                 switch (phdr->p_type) {
235                 case PT_INTERP:
236                         retval = -ENOMEM;
237                         if (phdr->p_filesz > PATH_MAX)
238                                 goto error;
239                         retval = -ENOENT;
240                         if (phdr->p_filesz < 2)
241                                 goto error;
242 
243                         /* read the name of the interpreter into memory */
244                         interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
245                         if (!interpreter_name)
246                                 goto error;
247 
248                         retval = kernel_read(bprm->file,
249                                              phdr->p_offset,
250                                              interpreter_name,
251                                              phdr->p_filesz);
252                         if (unlikely(retval != phdr->p_filesz)) {
253                                 if (retval >= 0)
254                                         retval = -ENOEXEC;
255                                 goto error;
256                         }
257 
258                         retval = -ENOENT;
259                         if (interpreter_name[phdr->p_filesz - 1] != '\0')
260                                 goto error;
261 
262                         kdebug("Using ELF interpreter %s", interpreter_name);
263 
264                         /* replace the program with the interpreter */
265                         interpreter = open_exec(interpreter_name);
266                         retval = PTR_ERR(interpreter);
267                         if (IS_ERR(interpreter)) {
268                                 interpreter = NULL;
269                                 goto error;
270                         }
271 
272                         /*
273                          * If the binary is not readable then enforce
274                          * mm->dumpable = 0 regardless of the interpreter's
275                          * permissions.
276                          */
277                         would_dump(bprm, interpreter);
278 
279                         retval = kernel_read(interpreter, 0, bprm->buf,
280                                              BINPRM_BUF_SIZE);
281                         if (unlikely(retval != BINPRM_BUF_SIZE)) {
282                                 if (retval >= 0)
283                                         retval = -ENOEXEC;
284                                 goto error;
285                         }
286 
287                         interp_params.hdr = *((struct elfhdr *) bprm->buf);
288                         break;
289 
290                 case PT_LOAD:
291 #ifdef CONFIG_MMU
292                         if (exec_params.load_addr == 0)
293                                 exec_params.load_addr = phdr->p_vaddr;
294 #endif
295                         break;
296                 }
297 
298         }
299 
300         if (is_constdisp(&exec_params.hdr))
301                 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
302 
303         /* perform insanity checks on the interpreter */
304         if (interpreter_name) {
305                 retval = -ELIBBAD;
306                 if (!is_elf(&interp_params.hdr, interpreter))
307                         goto error;
308 
309                 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
310 
311                 /* read the interpreter's program header table */
312                 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
313                 if (retval < 0)
314                         goto error;
315         }
316 
317         stack_size = exec_params.stack_size;
318         if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
319                 executable_stack = EXSTACK_ENABLE_X;
320         else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
321                 executable_stack = EXSTACK_DISABLE_X;
322         else
323                 executable_stack = EXSTACK_DEFAULT;
324 
325         if (stack_size == 0) {
326                 stack_size = interp_params.stack_size;
327                 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
328                         executable_stack = EXSTACK_ENABLE_X;
329                 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
330                         executable_stack = EXSTACK_DISABLE_X;
331                 else
332                         executable_stack = EXSTACK_DEFAULT;
333         }
334 
335         retval = -ENOEXEC;
336         if (stack_size == 0)
337                 stack_size = 131072UL; /* same as exec.c's default commit */
338 
339         if (is_constdisp(&interp_params.hdr))
340                 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
341 
342         /* flush all traces of the currently running executable */
343         retval = flush_old_exec(bprm);
344         if (retval)
345                 goto error;
346 
347         /* there's now no turning back... the old userspace image is dead,
348          * defunct, deceased, etc.
349          */
350         if (elf_check_fdpic(&exec_params.hdr))
351                 set_personality(PER_LINUX_FDPIC);
352         else
353                 set_personality(PER_LINUX);
354         if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
355                 current->personality |= READ_IMPLIES_EXEC;
356 
357         setup_new_exec(bprm);
358 
359         set_binfmt(&elf_fdpic_format);
360 
361         current->mm->start_code = 0;
362         current->mm->end_code = 0;
363         current->mm->start_stack = 0;
364         current->mm->start_data = 0;
365         current->mm->end_data = 0;
366         current->mm->context.exec_fdpic_loadmap = 0;
367         current->mm->context.interp_fdpic_loadmap = 0;
368 
369 #ifdef CONFIG_MMU
370         elf_fdpic_arch_lay_out_mm(&exec_params,
371                                   &interp_params,
372                                   &current->mm->start_stack,
373                                   &current->mm->start_brk);
374 
375         retval = setup_arg_pages(bprm, current->mm->start_stack,
376                                  executable_stack);
377         if (retval < 0)
378                 goto error;
379 #endif
380 
381         /* load the executable and interpreter into memory */
382         retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
383                                     "executable");
384         if (retval < 0)
385                 goto error;
386 
387         if (interpreter_name) {
388                 retval = elf_fdpic_map_file(&interp_params, interpreter,
389                                             current->mm, "interpreter");
390                 if (retval < 0) {
391                         printk(KERN_ERR "Unable to load interpreter\n");
392                         goto error;
393                 }
394 
395                 allow_write_access(interpreter);
396                 fput(interpreter);
397                 interpreter = NULL;
398         }
399 
400 #ifdef CONFIG_MMU
401         if (!current->mm->start_brk)
402                 current->mm->start_brk = current->mm->end_data;
403 
404         current->mm->brk = current->mm->start_brk =
405                 PAGE_ALIGN(current->mm->start_brk);
406 
407 #else
408         /* create a stack area and zero-size brk area */
409         stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
410         if (stack_size < PAGE_SIZE * 2)
411                 stack_size = PAGE_SIZE * 2;
412 
413         stack_prot = PROT_READ | PROT_WRITE;
414         if (executable_stack == EXSTACK_ENABLE_X ||
415             (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
416                 stack_prot |= PROT_EXEC;
417 
418         current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,
419                                          MAP_PRIVATE | MAP_ANONYMOUS |
420                                          MAP_UNINITIALIZED | MAP_GROWSDOWN,
421                                          0);
422 
423         if (IS_ERR_VALUE(current->mm->start_brk)) {
424                 retval = current->mm->start_brk;
425                 current->mm->start_brk = 0;
426                 goto error;
427         }
428 
429         current->mm->brk = current->mm->start_brk;
430         current->mm->context.end_brk = current->mm->start_brk;
431         current->mm->start_stack = current->mm->start_brk + stack_size;
432 #endif
433 
434         install_exec_creds(bprm);
435         if (create_elf_fdpic_tables(bprm, current->mm,
436                                     &exec_params, &interp_params) < 0)
437                 goto error;
438 
439         kdebug("- start_code  %lx", current->mm->start_code);
440         kdebug("- end_code    %lx", current->mm->end_code);
441         kdebug("- start_data  %lx", current->mm->start_data);
442         kdebug("- end_data    %lx", current->mm->end_data);
443         kdebug("- start_brk   %lx", current->mm->start_brk);
444         kdebug("- brk         %lx", current->mm->brk);
445         kdebug("- start_stack %lx", current->mm->start_stack);
446 
447 #ifdef ELF_FDPIC_PLAT_INIT
448         /*
449          * The ABI may specify that certain registers be set up in special
450          * ways (on i386 %edx is the address of a DT_FINI function, for
451          * example.  This macro performs whatever initialization to
452          * the regs structure is required.
453          */
454         dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
455         ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
456                             dynaddr);
457 #endif
458 
459         /* everything is now ready... get the userspace context ready to roll */
460         entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
461         start_thread(regs, entryaddr, current->mm->start_stack);
462 
463         retval = 0;
464 
465 error:
466         if (interpreter) {
467                 allow_write_access(interpreter);
468                 fput(interpreter);
469         }
470         kfree(interpreter_name);
471         kfree(exec_params.phdrs);
472         kfree(exec_params.loadmap);
473         kfree(interp_params.phdrs);
474         kfree(interp_params.loadmap);
475         return retval;
476 }
477 
478 /*****************************************************************************/
479 
480 #ifndef ELF_BASE_PLATFORM
481 /*
482  * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
483  * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
484  * will be copied to the user stack in the same manner as AT_PLATFORM.
485  */
486 #define ELF_BASE_PLATFORM NULL
487 #endif
488 
489 /*
490  * present useful information to the program by shovelling it onto the new
491  * process's stack
492  */
493 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
494                                    struct mm_struct *mm,
495                                    struct elf_fdpic_params *exec_params,
496                                    struct elf_fdpic_params *interp_params)
497 {
498         const struct cred *cred = current_cred();
499         unsigned long sp, csp, nitems;
500         elf_caddr_t __user *argv, *envp;
501         size_t platform_len = 0, len;
502         char *k_platform, *k_base_platform;
503         char __user *u_platform, *u_base_platform, *p;
504         int loop;
505         int nr; /* reset for each csp adjustment */
506 
507 #ifdef CONFIG_MMU
508         /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
509          * by the processes running on the same package. One thing we can do is
510          * to shuffle the initial stack for them, so we give the architecture
511          * an opportunity to do so here.
512          */
513         sp = arch_align_stack(bprm->p);
514 #else
515         sp = mm->start_stack;
516 
517         /* stack the program arguments and environment */
518         if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
519                 return -EFAULT;
520 #endif
521 
522         /*
523          * If this architecture has a platform capability string, copy it
524          * to userspace.  In some cases (Sparc), this info is impossible
525          * for userspace to get any other way, in others (i386) it is
526          * merely difficult.
527          */
528         k_platform = ELF_PLATFORM;
529         u_platform = NULL;
530 
531         if (k_platform) {
532                 platform_len = strlen(k_platform) + 1;
533                 sp -= platform_len;
534                 u_platform = (char __user *) sp;
535                 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
536                         return -EFAULT;
537         }
538 
539         /*
540          * If this architecture has a "base" platform capability
541          * string, copy it to userspace.
542          */
543         k_base_platform = ELF_BASE_PLATFORM;
544         u_base_platform = NULL;
545 
546         if (k_base_platform) {
547                 platform_len = strlen(k_base_platform) + 1;
548                 sp -= platform_len;
549                 u_base_platform = (char __user *) sp;
550                 if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
551                         return -EFAULT;
552         }
553 
554         sp &= ~7UL;
555 
556         /* stack the load map(s) */
557         len = sizeof(struct elf32_fdpic_loadmap);
558         len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
559         sp = (sp - len) & ~7UL;
560         exec_params->map_addr = sp;
561 
562         if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
563                 return -EFAULT;
564 
565         current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
566 
567         if (interp_params->loadmap) {
568                 len = sizeof(struct elf32_fdpic_loadmap);
569                 len += sizeof(struct elf32_fdpic_loadseg) *
570                         interp_params->loadmap->nsegs;
571                 sp = (sp - len) & ~7UL;
572                 interp_params->map_addr = sp;
573 
574                 if (copy_to_user((void __user *) sp, interp_params->loadmap,
575                                  len) != 0)
576                         return -EFAULT;
577 
578                 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
579         }
580 
581         /* force 16 byte _final_ alignment here for generality */
582 #define DLINFO_ITEMS 15
583 
584         nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
585                 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
586 
587         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
588                 nitems++;
589 
590         csp = sp;
591         sp -= nitems * 2 * sizeof(unsigned long);
592         sp -= (bprm->envc + 1) * sizeof(char *);        /* envv[] */
593         sp -= (bprm->argc + 1) * sizeof(char *);        /* argv[] */
594         sp -= 1 * sizeof(unsigned long);                /* argc */
595 
596         csp -= sp & 15UL;
597         sp -= sp & 15UL;
598 
599         /* put the ELF interpreter info on the stack */
600 #define NEW_AUX_ENT(id, val)                                            \
601         do {                                                            \
602                 struct { unsigned long _id, _val; } __user *ent;        \
603                                                                         \
604                 ent = (void __user *) csp;                              \
605                 __put_user((id), &ent[nr]._id);                         \
606                 __put_user((val), &ent[nr]._val);                       \
607                 nr++;                                                   \
608         } while (0)
609 
610         nr = 0;
611         csp -= 2 * sizeof(unsigned long);
612         NEW_AUX_ENT(AT_NULL, 0);
613         if (k_platform) {
614                 nr = 0;
615                 csp -= 2 * sizeof(unsigned long);
616                 NEW_AUX_ENT(AT_PLATFORM,
617                             (elf_addr_t) (unsigned long) u_platform);
618         }
619 
620         if (k_base_platform) {
621                 nr = 0;
622                 csp -= 2 * sizeof(unsigned long);
623                 NEW_AUX_ENT(AT_BASE_PLATFORM,
624                             (elf_addr_t) (unsigned long) u_base_platform);
625         }
626 
627         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
628                 nr = 0;
629                 csp -= 2 * sizeof(unsigned long);
630                 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
631         }
632 
633         nr = 0;
634         csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
635         NEW_AUX_ENT(AT_HWCAP,   ELF_HWCAP);
636 #ifdef ELF_HWCAP2
637         NEW_AUX_ENT(AT_HWCAP2,  ELF_HWCAP2);
638 #endif
639         NEW_AUX_ENT(AT_PAGESZ,  PAGE_SIZE);
640         NEW_AUX_ENT(AT_CLKTCK,  CLOCKS_PER_SEC);
641         NEW_AUX_ENT(AT_PHDR,    exec_params->ph_addr);
642         NEW_AUX_ENT(AT_PHENT,   sizeof(struct elf_phdr));
643         NEW_AUX_ENT(AT_PHNUM,   exec_params->hdr.e_phnum);
644         NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
645         NEW_AUX_ENT(AT_FLAGS,   0);
646         NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
647         NEW_AUX_ENT(AT_UID,     (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
648         NEW_AUX_ENT(AT_EUID,    (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
649         NEW_AUX_ENT(AT_GID,     (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));
650         NEW_AUX_ENT(AT_EGID,    (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
651         NEW_AUX_ENT(AT_SECURE,  security_bprm_secureexec(bprm));
652         NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
653 
654 #ifdef ARCH_DLINFO
655         nr = 0;
656         csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
657 
658         /* ARCH_DLINFO must come last so platform specific code can enforce
659          * special alignment requirements on the AUXV if necessary (eg. PPC).
660          */
661         ARCH_DLINFO;
662 #endif
663 #undef NEW_AUX_ENT
664 
665         /* allocate room for argv[] and envv[] */
666         csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
667         envp = (elf_caddr_t __user *) csp;
668         csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
669         argv = (elf_caddr_t __user *) csp;
670 
671         /* stack argc */
672         csp -= sizeof(unsigned long);
673         __put_user(bprm->argc, (unsigned long __user *) csp);
674 
675         BUG_ON(csp != sp);
676 
677         /* fill in the argv[] array */
678 #ifdef CONFIG_MMU
679         current->mm->arg_start = bprm->p;
680 #else
681         current->mm->arg_start = current->mm->start_stack -
682                 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
683 #endif
684 
685         p = (char __user *) current->mm->arg_start;
686         for (loop = bprm->argc; loop > 0; loop--) {
687                 __put_user((elf_caddr_t) p, argv++);
688                 len = strnlen_user(p, MAX_ARG_STRLEN);
689                 if (!len || len > MAX_ARG_STRLEN)
690                         return -EINVAL;
691                 p += len;
692         }
693         __put_user(NULL, argv);
694         current->mm->arg_end = (unsigned long) p;
695 
696         /* fill in the envv[] array */
697         current->mm->env_start = (unsigned long) p;
698         for (loop = bprm->envc; loop > 0; loop--) {
699                 __put_user((elf_caddr_t)(unsigned long) p, envp++);
700                 len = strnlen_user(p, MAX_ARG_STRLEN);
701                 if (!len || len > MAX_ARG_STRLEN)
702                         return -EINVAL;
703                 p += len;
704         }
705         __put_user(NULL, envp);
706         current->mm->env_end = (unsigned long) p;
707 
708         mm->start_stack = (unsigned long) sp;
709         return 0;
710 }
711 
712 /*****************************************************************************/
713 /*
714  * transfer the program arguments and environment from the holding pages onto
715  * the stack
716  */
717 #ifndef CONFIG_MMU
718 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
719                                             unsigned long *_sp)
720 {
721         unsigned long index, stop, sp;
722         char *src;
723         int ret = 0;
724 
725         stop = bprm->p >> PAGE_SHIFT;
726         sp = *_sp;
727 
728         for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
729                 src = kmap(bprm->page[index]);
730                 sp -= PAGE_SIZE;
731                 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
732                         ret = -EFAULT;
733                 kunmap(bprm->page[index]);
734                 if (ret < 0)
735                         goto out;
736         }
737 
738         *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
739 
740 out:
741         return ret;
742 }
743 #endif
744 
745 /*****************************************************************************/
746 /*
747  * load the appropriate binary image (executable or interpreter) into memory
748  * - we assume no MMU is available
749  * - if no other PIC bits are set in params->hdr->e_flags
750  *   - we assume that the LOADable segments in the binary are independently relocatable
751  *   - we assume R/O executable segments are shareable
752  * - else
753  *   - we assume the loadable parts of the image to require fixed displacement
754  *   - the image is not shareable
755  */
756 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
757                               struct file *file,
758                               struct mm_struct *mm,
759                               const char *what)
760 {
761         struct elf32_fdpic_loadmap *loadmap;
762 #ifdef CONFIG_MMU
763         struct elf32_fdpic_loadseg *mseg;
764 #endif
765         struct elf32_fdpic_loadseg *seg;
766         struct elf32_phdr *phdr;
767         unsigned long load_addr, stop;
768         unsigned nloads, tmp;
769         size_t size;
770         int loop, ret;
771 
772         /* allocate a load map table */
773         nloads = 0;
774         for (loop = 0; loop < params->hdr.e_phnum; loop++)
775                 if (params->phdrs[loop].p_type == PT_LOAD)
776                         nloads++;
777 
778         if (nloads == 0)
779                 return -ELIBBAD;
780 
781         size = sizeof(*loadmap) + nloads * sizeof(*seg);
782         loadmap = kzalloc(size, GFP_KERNEL);
783         if (!loadmap)
784                 return -ENOMEM;
785 
786         params->loadmap = loadmap;
787 
788         loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
789         loadmap->nsegs = nloads;
790 
791         load_addr = params->load_addr;
792         seg = loadmap->segs;
793 
794         /* map the requested LOADs into the memory space */
795         switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
796         case ELF_FDPIC_FLAG_CONSTDISP:
797         case ELF_FDPIC_FLAG_CONTIGUOUS:
798 #ifndef CONFIG_MMU
799                 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
800                 if (ret < 0)
801                         return ret;
802                 break;
803 #endif
804         default:
805                 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
806                 if (ret < 0)
807                         return ret;
808                 break;
809         }
810 
811         /* map the entry point */
812         if (params->hdr.e_entry) {
813                 seg = loadmap->segs;
814                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
815                         if (params->hdr.e_entry >= seg->p_vaddr &&
816                             params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
817                                 params->entry_addr =
818                                         (params->hdr.e_entry - seg->p_vaddr) +
819                                         seg->addr;
820                                 break;
821                         }
822                 }
823         }
824 
825         /* determine where the program header table has wound up if mapped */
826         stop = params->hdr.e_phoff;
827         stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
828         phdr = params->phdrs;
829 
830         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
831                 if (phdr->p_type != PT_LOAD)
832                         continue;
833 
834                 if (phdr->p_offset > params->hdr.e_phoff ||
835                     phdr->p_offset + phdr->p_filesz < stop)
836                         continue;
837 
838                 seg = loadmap->segs;
839                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
840                         if (phdr->p_vaddr >= seg->p_vaddr &&
841                             phdr->p_vaddr + phdr->p_filesz <=
842                             seg->p_vaddr + seg->p_memsz) {
843                                 params->ph_addr =
844                                         (phdr->p_vaddr - seg->p_vaddr) +
845                                         seg->addr +
846                                         params->hdr.e_phoff - phdr->p_offset;
847                                 break;
848                         }
849                 }
850                 break;
851         }
852 
853         /* determine where the dynamic section has wound up if there is one */
854         phdr = params->phdrs;
855         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
856                 if (phdr->p_type != PT_DYNAMIC)
857                         continue;
858 
859                 seg = loadmap->segs;
860                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
861                         if (phdr->p_vaddr >= seg->p_vaddr &&
862                             phdr->p_vaddr + phdr->p_memsz <=
863                             seg->p_vaddr + seg->p_memsz) {
864                                 params->dynamic_addr =
865                                         (phdr->p_vaddr - seg->p_vaddr) +
866                                         seg->addr;
867 
868                                 /* check the dynamic section contains at least
869                                  * one item, and that the last item is a NULL
870                                  * entry */
871                                 if (phdr->p_memsz == 0 ||
872                                     phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
873                                         goto dynamic_error;
874 
875                                 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
876                                 if (((Elf32_Dyn *)
877                                      params->dynamic_addr)[tmp - 1].d_tag != 0)
878                                         goto dynamic_error;
879                                 break;
880                         }
881                 }
882                 break;
883         }
884 
885         /* now elide adjacent segments in the load map on MMU linux
886          * - on uClinux the holes between may actually be filled with system
887          *   stuff or stuff from other processes
888          */
889 #ifdef CONFIG_MMU
890         nloads = loadmap->nsegs;
891         mseg = loadmap->segs;
892         seg = mseg + 1;
893         for (loop = 1; loop < nloads; loop++) {
894                 /* see if we have a candidate for merging */
895                 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
896                         load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
897                         if (load_addr == (seg->addr & PAGE_MASK)) {
898                                 mseg->p_memsz +=
899                                         load_addr -
900                                         (mseg->addr + mseg->p_memsz);
901                                 mseg->p_memsz += seg->addr & ~PAGE_MASK;
902                                 mseg->p_memsz += seg->p_memsz;
903                                 loadmap->nsegs--;
904                                 continue;
905                         }
906                 }
907 
908                 mseg++;
909                 if (mseg != seg)
910                         *mseg = *seg;
911         }
912 #endif
913 
914         kdebug("Mapped Object [%s]:", what);
915         kdebug("- elfhdr   : %lx", params->elfhdr_addr);
916         kdebug("- entry    : %lx", params->entry_addr);
917         kdebug("- PHDR[]   : %lx", params->ph_addr);
918         kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
919         seg = loadmap->segs;
920         for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
921                 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
922                        loop,
923                        seg->addr, seg->addr + seg->p_memsz - 1,
924                        seg->p_vaddr, seg->p_memsz);
925 
926         return 0;
927 
928 dynamic_error:
929         printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
930                what, file_inode(file)->i_ino);
931         return -ELIBBAD;
932 }
933 
934 /*****************************************************************************/
935 /*
936  * map a file with constant displacement under uClinux
937  */
938 #ifndef CONFIG_MMU
939 static int elf_fdpic_map_file_constdisp_on_uclinux(
940         struct elf_fdpic_params *params,
941         struct file *file,
942         struct mm_struct *mm)
943 {
944         struct elf32_fdpic_loadseg *seg;
945         struct elf32_phdr *phdr;
946         unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
947         int loop, ret;
948 
949         load_addr = params->load_addr;
950         seg = params->loadmap->segs;
951 
952         /* determine the bounds of the contiguous overall allocation we must
953          * make */
954         phdr = params->phdrs;
955         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
956                 if (params->phdrs[loop].p_type != PT_LOAD)
957                         continue;
958 
959                 if (base > phdr->p_vaddr)
960                         base = phdr->p_vaddr;
961                 if (top < phdr->p_vaddr + phdr->p_memsz)
962                         top = phdr->p_vaddr + phdr->p_memsz;
963         }
964 
965         /* allocate one big anon block for everything */
966         mflags = MAP_PRIVATE;
967         if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
968                 mflags |= MAP_EXECUTABLE;
969 
970         maddr = vm_mmap(NULL, load_addr, top - base,
971                         PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
972         if (IS_ERR_VALUE(maddr))
973                 return (int) maddr;
974 
975         if (load_addr != 0)
976                 load_addr += PAGE_ALIGN(top - base);
977 
978         /* and then load the file segments into it */
979         phdr = params->phdrs;
980         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
981                 if (params->phdrs[loop].p_type != PT_LOAD)
982                         continue;
983 
984                 seg->addr = maddr + (phdr->p_vaddr - base);
985                 seg->p_vaddr = phdr->p_vaddr;
986                 seg->p_memsz = phdr->p_memsz;
987 
988                 ret = read_code(file, seg->addr, phdr->p_offset,
989                                        phdr->p_filesz);
990                 if (ret < 0)
991                         return ret;
992 
993                 /* map the ELF header address if in this segment */
994                 if (phdr->p_offset == 0)
995                         params->elfhdr_addr = seg->addr;
996 
997                 /* clear any space allocated but not loaded */
998                 if (phdr->p_filesz < phdr->p_memsz) {
999                         if (clear_user((void *) (seg->addr + phdr->p_filesz),
1000                                        phdr->p_memsz - phdr->p_filesz))
1001                                 return -EFAULT;
1002                 }
1003 
1004                 if (mm) {
1005                         if (phdr->p_flags & PF_X) {
1006                                 if (!mm->start_code) {
1007                                         mm->start_code = seg->addr;
1008                                         mm->end_code = seg->addr +
1009                                                 phdr->p_memsz;
1010                                 }
1011                         } else if (!mm->start_data) {
1012                                 mm->start_data = seg->addr;
1013                                 mm->end_data = seg->addr + phdr->p_memsz;
1014                         }
1015                 }
1016 
1017                 seg++;
1018         }
1019 
1020         return 0;
1021 }
1022 #endif
1023 
1024 /*****************************************************************************/
1025 /*
1026  * map a binary by direct mmap() of the individual PT_LOAD segments
1027  */
1028 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1029                                              struct file *file,
1030                                              struct mm_struct *mm)
1031 {
1032         struct elf32_fdpic_loadseg *seg;
1033         struct elf32_phdr *phdr;
1034         unsigned long load_addr, delta_vaddr;
1035         int loop, dvset;
1036 
1037         load_addr = params->load_addr;
1038         delta_vaddr = 0;
1039         dvset = 0;
1040 
1041         seg = params->loadmap->segs;
1042 
1043         /* deal with each load segment separately */
1044         phdr = params->phdrs;
1045         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1046                 unsigned long maddr, disp, excess, excess1;
1047                 int prot = 0, flags;
1048 
1049                 if (phdr->p_type != PT_LOAD)
1050                         continue;
1051 
1052                 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1053                        (unsigned long) phdr->p_vaddr,
1054                        (unsigned long) phdr->p_offset,
1055                        (unsigned long) phdr->p_filesz,
1056                        (unsigned long) phdr->p_memsz);
1057 
1058                 /* determine the mapping parameters */
1059                 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1060                 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1061                 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1062 
1063                 flags = MAP_PRIVATE | MAP_DENYWRITE;
1064                 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1065                         flags |= MAP_EXECUTABLE;
1066 
1067                 maddr = 0;
1068 
1069                 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1070                 case ELF_FDPIC_FLAG_INDEPENDENT:
1071                         /* PT_LOADs are independently locatable */
1072                         break;
1073 
1074                 case ELF_FDPIC_FLAG_HONOURVADDR:
1075                         /* the specified virtual address must be honoured */
1076                         maddr = phdr->p_vaddr;
1077                         flags |= MAP_FIXED;
1078                         break;
1079 
1080                 case ELF_FDPIC_FLAG_CONSTDISP:
1081                         /* constant displacement
1082                          * - can be mapped anywhere, but must be mapped as a
1083                          *   unit
1084                          */
1085                         if (!dvset) {
1086                                 maddr = load_addr;
1087                                 delta_vaddr = phdr->p_vaddr;
1088                                 dvset = 1;
1089                         } else {
1090                                 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1091                                 flags |= MAP_FIXED;
1092                         }
1093                         break;
1094 
1095                 case ELF_FDPIC_FLAG_CONTIGUOUS:
1096                         /* contiguity handled later */
1097                         break;
1098 
1099                 default:
1100                         BUG();
1101                 }
1102 
1103                 maddr &= PAGE_MASK;
1104 
1105                 /* create the mapping */
1106                 disp = phdr->p_vaddr & ~PAGE_MASK;
1107                 maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1108                                 phdr->p_offset - disp);
1109 
1110                 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1111                        loop, phdr->p_memsz + disp, prot, flags,
1112                        phdr->p_offset - disp, maddr);
1113 
1114                 if (IS_ERR_VALUE(maddr))
1115                         return (int) maddr;
1116 
1117                 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1118                     ELF_FDPIC_FLAG_CONTIGUOUS)
1119                         load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1120 
1121                 seg->addr = maddr + disp;
1122                 seg->p_vaddr = phdr->p_vaddr;
1123                 seg->p_memsz = phdr->p_memsz;
1124 
1125                 /* map the ELF header address if in this segment */
1126                 if (phdr->p_offset == 0)
1127                         params->elfhdr_addr = seg->addr;
1128 
1129                 /* clear the bit between beginning of mapping and beginning of
1130                  * PT_LOAD */
1131                 if (prot & PROT_WRITE && disp > 0) {
1132                         kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1133                         if (clear_user((void __user *) maddr, disp))
1134                                 return -EFAULT;
1135                         maddr += disp;
1136                 }
1137 
1138                 /* clear any space allocated but not loaded
1139                  * - on uClinux we can just clear the lot
1140                  * - on MMU linux we'll get a SIGBUS beyond the last page
1141                  *   extant in the file
1142                  */
1143                 excess = phdr->p_memsz - phdr->p_filesz;
1144                 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1145 
1146 #ifdef CONFIG_MMU
1147                 if (excess > excess1) {
1148                         unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1149                         unsigned long xmaddr;
1150 
1151                         flags |= MAP_FIXED | MAP_ANONYMOUS;
1152                         xmaddr = vm_mmap(NULL, xaddr, excess - excess1,
1153                                          prot, flags, 0);
1154 
1155                         kdebug("mmap[%d] <anon>"
1156                                " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1157                                loop, xaddr, excess - excess1, prot, flags,
1158                                xmaddr);
1159 
1160                         if (xmaddr != xaddr)
1161                                 return -ENOMEM;
1162                 }
1163 
1164                 if (prot & PROT_WRITE && excess1 > 0) {
1165                         kdebug("clear[%d] ad=%lx sz=%lx",
1166                                loop, maddr + phdr->p_filesz, excess1);
1167                         if (clear_user((void __user *) maddr + phdr->p_filesz,
1168                                        excess1))
1169                                 return -EFAULT;
1170                 }
1171 
1172 #else
1173                 if (excess > 0) {
1174                         kdebug("clear[%d] ad=%lx sz=%lx",
1175                                loop, maddr + phdr->p_filesz, excess);
1176                         if (clear_user((void *) maddr + phdr->p_filesz, excess))
1177                                 return -EFAULT;
1178                 }
1179 #endif
1180 
1181                 if (mm) {
1182                         if (phdr->p_flags & PF_X) {
1183                                 if (!mm->start_code) {
1184                                         mm->start_code = maddr;
1185                                         mm->end_code = maddr + phdr->p_memsz;
1186                                 }
1187                         } else if (!mm->start_data) {
1188                                 mm->start_data = maddr;
1189                                 mm->end_data = maddr + phdr->p_memsz;
1190                         }
1191                 }
1192 
1193                 seg++;
1194         }
1195 
1196         return 0;
1197 }
1198 
1199 /*****************************************************************************/
1200 /*
1201  * ELF-FDPIC core dumper
1202  *
1203  * Modelled on fs/exec.c:aout_core_dump()
1204  * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1205  *
1206  * Modelled on fs/binfmt_elf.c core dumper
1207  */
1208 #ifdef CONFIG_ELF_CORE
1209 
1210 /*
1211  * Decide whether a segment is worth dumping; default is yes to be
1212  * sure (missing info is worse than too much; etc).
1213  * Personally I'd include everything, and use the coredump limit...
1214  *
1215  * I think we should skip something. But I am not sure how. H.J.
1216  */
1217 static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
1218 {
1219         int dump_ok;
1220 
1221         /* Do not dump I/O mapped devices or special mappings */
1222         if (vma->vm_flags & VM_IO) {
1223                 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1224                 return 0;
1225         }
1226 
1227         /* If we may not read the contents, don't allow us to dump
1228          * them either. "dump_write()" can't handle it anyway.
1229          */
1230         if (!(vma->vm_flags & VM_READ)) {
1231                 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1232                 return 0;
1233         }
1234 
1235         /* support for DAX */
1236         if (vma_is_dax(vma)) {
1237                 if (vma->vm_flags & VM_SHARED) {
1238                         dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags);
1239                         kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start,
1240                                vma->vm_flags, dump_ok ? "yes" : "no");
1241                 } else {
1242                         dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags);
1243                         kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start,
1244                                vma->vm_flags, dump_ok ? "yes" : "no");
1245                 }
1246                 return dump_ok;
1247         }
1248 
1249         /* By default, dump shared memory if mapped from an anonymous file. */
1250         if (vma->vm_flags & VM_SHARED) {
1251                 if (file_inode(vma->vm_file)->i_nlink == 0) {
1252                         dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
1253                         kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1254                                vma->vm_flags, dump_ok ? "yes" : "no");
1255                         return dump_ok;
1256                 }
1257 
1258                 dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
1259                 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1260                        vma->vm_flags, dump_ok ? "yes" : "no");
1261                 return dump_ok;
1262         }
1263 
1264 #ifdef CONFIG_MMU
1265         /* By default, if it hasn't been written to, don't write it out */
1266         if (!vma->anon_vma) {
1267                 dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
1268                 kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
1269                        vma->vm_flags, dump_ok ? "yes" : "no");
1270                 return dump_ok;
1271         }
1272 #endif
1273 
1274         dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
1275         kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
1276                dump_ok ? "yes" : "no");
1277         return dump_ok;
1278 }
1279 
1280 /* An ELF note in memory */
1281 struct memelfnote
1282 {
1283         const char *name;
1284         int type;
1285         unsigned int datasz;
1286         void *data;
1287 };
1288 
1289 static int notesize(struct memelfnote *en)
1290 {
1291         int sz;
1292 
1293         sz = sizeof(struct elf_note);
1294         sz += roundup(strlen(en->name) + 1, 4);
1295         sz += roundup(en->datasz, 4);
1296 
1297         return sz;
1298 }
1299 
1300 /* #define DEBUG */
1301 
1302 static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1303 {
1304         struct elf_note en;
1305         en.n_namesz = strlen(men->name) + 1;
1306         en.n_descsz = men->datasz;
1307         en.n_type = men->type;
1308 
1309         return dump_emit(cprm, &en, sizeof(en)) &&
1310                 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1311                 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1312 }
1313 
1314 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1315 {
1316         memcpy(elf->e_ident, ELFMAG, SELFMAG);
1317         elf->e_ident[EI_CLASS] = ELF_CLASS;
1318         elf->e_ident[EI_DATA] = ELF_DATA;
1319         elf->e_ident[EI_VERSION] = EV_CURRENT;
1320         elf->e_ident[EI_OSABI] = ELF_OSABI;
1321         memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1322 
1323         elf->e_type = ET_CORE;
1324         elf->e_machine = ELF_ARCH;
1325         elf->e_version = EV_CURRENT;
1326         elf->e_entry = 0;
1327         elf->e_phoff = sizeof(struct elfhdr);
1328         elf->e_shoff = 0;
1329         elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1330         elf->e_ehsize = sizeof(struct elfhdr);
1331         elf->e_phentsize = sizeof(struct elf_phdr);
1332         elf->e_phnum = segs;
1333         elf->e_shentsize = 0;
1334         elf->e_shnum = 0;
1335         elf->e_shstrndx = 0;
1336         return;
1337 }
1338 
1339 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1340 {
1341         phdr->p_type = PT_NOTE;
1342         phdr->p_offset = offset;
1343         phdr->p_vaddr = 0;
1344         phdr->p_paddr = 0;
1345         phdr->p_filesz = sz;
1346         phdr->p_memsz = 0;
1347         phdr->p_flags = 0;
1348         phdr->p_align = 0;
1349         return;
1350 }
1351 
1352 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1353                 unsigned int sz, void *data)
1354 {
1355         note->name = name;
1356         note->type = type;
1357         note->datasz = sz;
1358         note->data = data;
1359         return;
1360 }
1361 
1362 /*
1363  * fill up all the fields in prstatus from the given task struct, except
1364  * registers which need to be filled up separately.
1365  */
1366 static void fill_prstatus(struct elf_prstatus *prstatus,
1367                           struct task_struct *p, long signr)
1368 {
1369         prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1370         prstatus->pr_sigpend = p->pending.signal.sig[0];
1371         prstatus->pr_sighold = p->blocked.sig[0];
1372         rcu_read_lock();
1373         prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1374         rcu_read_unlock();
1375         prstatus->pr_pid = task_pid_vnr(p);
1376         prstatus->pr_pgrp = task_pgrp_vnr(p);
1377         prstatus->pr_sid = task_session_vnr(p);
1378         if (thread_group_leader(p)) {
1379                 struct task_cputime cputime;
1380 
1381                 /*
1382                  * This is the record for the group leader.  It shows the
1383                  * group-wide total, not its individual thread total.
1384                  */
1385                 thread_group_cputime(p, &cputime);
1386                 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1387                 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1388         } else {
1389                 cputime_t utime, stime;
1390 
1391                 task_cputime(p, &utime, &stime);
1392                 cputime_to_timeval(utime, &prstatus->pr_utime);
1393                 cputime_to_timeval(stime, &prstatus->pr_stime);
1394         }
1395         cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1396         cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1397 
1398         prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1399         prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1400 }
1401 
1402 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1403                        struct mm_struct *mm)
1404 {
1405         const struct cred *cred;
1406         unsigned int i, len;
1407 
1408         /* first copy the parameters from user space */
1409         memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1410 
1411         len = mm->arg_end - mm->arg_start;
1412         if (len >= ELF_PRARGSZ)
1413                 len = ELF_PRARGSZ - 1;
1414         if (copy_from_user(&psinfo->pr_psargs,
1415                            (const char __user *) mm->arg_start, len))
1416                 return -EFAULT;
1417         for (i = 0; i < len; i++)
1418                 if (psinfo->pr_psargs[i] == 0)
1419                         psinfo->pr_psargs[i] = ' ';
1420         psinfo->pr_psargs[len] = 0;
1421 
1422         rcu_read_lock();
1423         psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1424         rcu_read_unlock();
1425         psinfo->pr_pid = task_pid_vnr(p);
1426         psinfo->pr_pgrp = task_pgrp_vnr(p);
1427         psinfo->pr_sid = task_session_vnr(p);
1428 
1429         i = p->state ? ffz(~p->state) + 1 : 0;
1430         psinfo->pr_state = i;
1431         psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1432         psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1433         psinfo->pr_nice = task_nice(p);
1434         psinfo->pr_flag = p->flags;
1435         rcu_read_lock();
1436         cred = __task_cred(p);
1437         SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1438         SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1439         rcu_read_unlock();
1440         strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1441 
1442         return 0;
1443 }
1444 
1445 /* Here is the structure in which status of each thread is captured. */
1446 struct elf_thread_status
1447 {
1448         struct list_head list;
1449         struct elf_prstatus prstatus;   /* NT_PRSTATUS */
1450         elf_fpregset_t fpu;             /* NT_PRFPREG */
1451         struct task_struct *thread;
1452 #ifdef ELF_CORE_COPY_XFPREGS
1453         elf_fpxregset_t xfpu;           /* ELF_CORE_XFPREG_TYPE */
1454 #endif
1455         struct memelfnote notes[3];
1456         int num_notes;
1457 };
1458 
1459 /*
1460  * In order to add the specific thread information for the elf file format,
1461  * we need to keep a linked list of every thread's pr_status and then create
1462  * a single section for them in the final core file.
1463  */
1464 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1465 {
1466         struct task_struct *p = t->thread;
1467         int sz = 0;
1468 
1469         t->num_notes = 0;
1470 
1471         fill_prstatus(&t->prstatus, p, signr);
1472         elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1473 
1474         fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1475                   &t->prstatus);
1476         t->num_notes++;
1477         sz += notesize(&t->notes[0]);
1478 
1479         t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1480         if (t->prstatus.pr_fpvalid) {
1481                 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1482                           &t->fpu);
1483                 t->num_notes++;
1484                 sz += notesize(&t->notes[1]);
1485         }
1486 
1487 #ifdef ELF_CORE_COPY_XFPREGS
1488         if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1489                 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1490                           sizeof(t->xfpu), &t->xfpu);
1491                 t->num_notes++;
1492                 sz += notesize(&t->notes[2]);
1493         }
1494 #endif
1495         return sz;
1496 }
1497 
1498 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1499                              elf_addr_t e_shoff, int segs)
1500 {
1501         elf->e_shoff = e_shoff;
1502         elf->e_shentsize = sizeof(*shdr4extnum);
1503         elf->e_shnum = 1;
1504         elf->e_shstrndx = SHN_UNDEF;
1505 
1506         memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1507 
1508         shdr4extnum->sh_type = SHT_NULL;
1509         shdr4extnum->sh_size = elf->e_shnum;
1510         shdr4extnum->sh_link = elf->e_shstrndx;
1511         shdr4extnum->sh_info = segs;
1512 }
1513 
1514 /*
1515  * dump the segments for an MMU process
1516  */
1517 static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
1518 {
1519         struct vm_area_struct *vma;
1520 
1521         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1522                 unsigned long addr;
1523 
1524                 if (!maydump(vma, cprm->mm_flags))
1525                         continue;
1526 
1527 #ifdef CONFIG_MMU
1528                 for (addr = vma->vm_start; addr < vma->vm_end;
1529                                                         addr += PAGE_SIZE) {
1530                         bool res;
1531                         struct page *page = get_dump_page(addr);
1532                         if (page) {
1533                                 void *kaddr = kmap(page);
1534                                 res = dump_emit(cprm, kaddr, PAGE_SIZE);
1535                                 kunmap(page);
1536                                 put_page(page);
1537                         } else {
1538                                 res = dump_skip(cprm, PAGE_SIZE);
1539                         }
1540                         if (!res)
1541                                 return false;
1542                 }
1543 #else
1544                 if (!dump_emit(cprm, (void *) vma->vm_start,
1545                                 vma->vm_end - vma->vm_start))
1546                         return false;
1547 #endif
1548         }
1549         return true;
1550 }
1551 
1552 static size_t elf_core_vma_data_size(unsigned long mm_flags)
1553 {
1554         struct vm_area_struct *vma;
1555         size_t size = 0;
1556 
1557         for (vma = current->mm->mmap; vma; vma = vma->vm_next)
1558                 if (maydump(vma, mm_flags))
1559                         size += vma->vm_end - vma->vm_start;
1560         return size;
1561 }
1562 
1563 /*
1564  * Actual dumper
1565  *
1566  * This is a two-pass process; first we find the offsets of the bits,
1567  * and then they are actually written out.  If we run out of core limit
1568  * we just truncate.
1569  */
1570 static int elf_fdpic_core_dump(struct coredump_params *cprm)
1571 {
1572 #define NUM_NOTES       6
1573         int has_dumped = 0;
1574         mm_segment_t fs;
1575         int segs;
1576         int i;
1577         struct vm_area_struct *vma;
1578         struct elfhdr *elf = NULL;
1579         loff_t offset = 0, dataoff;
1580         int numnote;
1581         struct memelfnote *notes = NULL;
1582         struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
1583         struct elf_prpsinfo *psinfo = NULL;     /* NT_PRPSINFO */
1584         LIST_HEAD(thread_list);
1585         struct list_head *t;
1586         elf_fpregset_t *fpu = NULL;
1587 #ifdef ELF_CORE_COPY_XFPREGS
1588         elf_fpxregset_t *xfpu = NULL;
1589 #endif
1590         int thread_status_size = 0;
1591         elf_addr_t *auxv;
1592         struct elf_phdr *phdr4note = NULL;
1593         struct elf_shdr *shdr4extnum = NULL;
1594         Elf_Half e_phnum;
1595         elf_addr_t e_shoff;
1596         struct core_thread *ct;
1597         struct elf_thread_status *tmp;
1598 
1599         /*
1600          * We no longer stop all VM operations.
1601          *
1602          * This is because those proceses that could possibly change map_count
1603          * or the mmap / vma pages are now blocked in do_exit on current
1604          * finishing this core dump.
1605          *
1606          * Only ptrace can touch these memory addresses, but it doesn't change
1607          * the map_count or the pages allocated. So no possibility of crashing
1608          * exists while dumping the mm->vm_next areas to the core file.
1609          */
1610 
1611         /* alloc memory for large data structures: too large to be on stack */
1612         elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1613         if (!elf)
1614                 goto cleanup;
1615         prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1616         if (!prstatus)
1617                 goto cleanup;
1618         psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1619         if (!psinfo)
1620                 goto cleanup;
1621         notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1622         if (!notes)
1623                 goto cleanup;
1624         fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1625         if (!fpu)
1626                 goto cleanup;
1627 #ifdef ELF_CORE_COPY_XFPREGS
1628         xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1629         if (!xfpu)
1630                 goto cleanup;
1631 #endif
1632 
1633         for (ct = current->mm->core_state->dumper.next;
1634                                         ct; ct = ct->next) {
1635                 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
1636                 if (!tmp)
1637                         goto cleanup;
1638 
1639                 tmp->thread = ct->task;
1640                 list_add(&tmp->list, &thread_list);
1641         }
1642 
1643         list_for_each(t, &thread_list) {
1644                 struct elf_thread_status *tmp;
1645                 int sz;
1646 
1647                 tmp = list_entry(t, struct elf_thread_status, list);
1648                 sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
1649                 thread_status_size += sz;
1650         }
1651 
1652         /* now collect the dump for the current */
1653         fill_prstatus(prstatus, current, cprm->siginfo->si_signo);
1654         elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
1655 
1656         segs = current->mm->map_count;
1657         segs += elf_core_extra_phdrs();
1658 
1659         /* for notes section */
1660         segs++;
1661 
1662         /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
1663          * this, kernel supports extended numbering. Have a look at
1664          * include/linux/elf.h for further information. */
1665         e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1666 
1667         /* Set up header */
1668         fill_elf_fdpic_header(elf, e_phnum);
1669 
1670         has_dumped = 1;
1671         /*
1672          * Set up the notes in similar form to SVR4 core dumps made
1673          * with info from their /proc.
1674          */
1675 
1676         fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1677         fill_psinfo(psinfo, current->group_leader, current->mm);
1678         fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1679 
1680         numnote = 2;
1681 
1682         auxv = (elf_addr_t *) current->mm->saved_auxv;
1683 
1684         i = 0;
1685         do
1686                 i += 2;
1687         while (auxv[i - 2] != AT_NULL);
1688         fill_note(&notes[numnote++], "CORE", NT_AUXV,
1689                   i * sizeof(elf_addr_t), auxv);
1690 
1691         /* Try to dump the FPU. */
1692         if ((prstatus->pr_fpvalid =
1693              elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
1694                 fill_note(notes + numnote++,
1695                           "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1696 #ifdef ELF_CORE_COPY_XFPREGS
1697         if (elf_core_copy_task_xfpregs(current, xfpu))
1698                 fill_note(notes + numnote++,
1699                           "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
1700 #endif
1701 
1702         fs = get_fs();
1703         set_fs(KERNEL_DS);
1704 
1705         offset += sizeof(*elf);                         /* Elf header */
1706         offset += segs * sizeof(struct elf_phdr);       /* Program headers */
1707 
1708         /* Write notes phdr entry */
1709         {
1710                 int sz = 0;
1711 
1712                 for (i = 0; i < numnote; i++)
1713                         sz += notesize(notes + i);
1714 
1715                 sz += thread_status_size;
1716 
1717                 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1718                 if (!phdr4note)
1719                         goto end_coredump;
1720 
1721                 fill_elf_note_phdr(phdr4note, sz, offset);
1722                 offset += sz;
1723         }
1724 
1725         /* Page-align dumped data */
1726         dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1727 
1728         offset += elf_core_vma_data_size(cprm->mm_flags);
1729         offset += elf_core_extra_data_size();
1730         e_shoff = offset;
1731 
1732         if (e_phnum == PN_XNUM) {
1733                 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
1734                 if (!shdr4extnum)
1735                         goto end_coredump;
1736                 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
1737         }
1738 
1739         offset = dataoff;
1740 
1741         if (!dump_emit(cprm, elf, sizeof(*elf)))
1742                 goto end_coredump;
1743 
1744         if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
1745                 goto end_coredump;
1746 
1747         /* write program headers for segments dump */
1748         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1749                 struct elf_phdr phdr;
1750                 size_t sz;
1751 
1752                 sz = vma->vm_end - vma->vm_start;
1753 
1754                 phdr.p_type = PT_LOAD;
1755                 phdr.p_offset = offset;
1756                 phdr.p_vaddr = vma->vm_start;
1757                 phdr.p_paddr = 0;
1758                 phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
1759                 phdr.p_memsz = sz;
1760                 offset += phdr.p_filesz;
1761                 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1762                 if (vma->vm_flags & VM_WRITE)
1763                         phdr.p_flags |= PF_W;
1764                 if (vma->vm_flags & VM_EXEC)
1765                         phdr.p_flags |= PF_X;
1766                 phdr.p_align = ELF_EXEC_PAGESIZE;
1767 
1768                 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
1769                         goto end_coredump;
1770         }
1771 
1772         if (!elf_core_write_extra_phdrs(cprm, offset))
1773                 goto end_coredump;
1774 
1775         /* write out the notes section */
1776         for (i = 0; i < numnote; i++)
1777                 if (!writenote(notes + i, cprm))
1778                         goto end_coredump;
1779 
1780         /* write out the thread status notes section */
1781         list_for_each(t, &thread_list) {
1782                 struct elf_thread_status *tmp =
1783                                 list_entry(t, struct elf_thread_status, list);
1784 
1785                 for (i = 0; i < tmp->num_notes; i++)
1786                         if (!writenote(&tmp->notes[i], cprm))
1787                                 goto end_coredump;
1788         }
1789 
1790         if (!dump_skip(cprm, dataoff - cprm->pos))
1791                 goto end_coredump;
1792 
1793         if (!elf_fdpic_dump_segments(cprm))
1794                 goto end_coredump;
1795 
1796         if (!elf_core_write_extra_data(cprm))
1797                 goto end_coredump;
1798 
1799         if (e_phnum == PN_XNUM) {
1800                 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
1801                         goto end_coredump;
1802         }
1803 
1804         if (cprm->file->f_pos != offset) {
1805                 /* Sanity check */
1806                 printk(KERN_WARNING
1807                        "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1808                        cprm->file->f_pos, offset);
1809         }
1810 
1811 end_coredump:
1812         set_fs(fs);
1813 
1814 cleanup:
1815         while (!list_empty(&thread_list)) {
1816                 struct list_head *tmp = thread_list.next;
1817                 list_del(tmp);
1818                 kfree(list_entry(tmp, struct elf_thread_status, list));
1819         }
1820         kfree(phdr4note);
1821         kfree(elf);
1822         kfree(prstatus);
1823         kfree(psinfo);
1824         kfree(notes);
1825         kfree(fpu);
1826         kfree(shdr4extnum);
1827 #ifdef ELF_CORE_COPY_XFPREGS
1828         kfree(xfpu);
1829 #endif
1830         return has_dumped;
1831 #undef NUM_NOTES
1832 }
1833 
1834 #endif          /* CONFIG_ELF_CORE */
1835 

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