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Linux/fs/binfmt_elf_fdpic.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* binfmt_elf_fdpic.c: FDPIC ELF binary format
  3  *
  4  * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
  5  * Written by David Howells (dhowells@redhat.com)
  6  * Derived from binfmt_elf.c
  7  */
  8 
  9 #include <linux/module.h>
 10 
 11 #include <linux/fs.h>
 12 #include <linux/stat.h>
 13 #include <linux/sched.h>
 14 #include <linux/sched/coredump.h>
 15 #include <linux/sched/task_stack.h>
 16 #include <linux/sched/cputime.h>
 17 #include <linux/mm.h>
 18 #include <linux/mman.h>
 19 #include <linux/errno.h>
 20 #include <linux/signal.h>
 21 #include <linux/binfmts.h>
 22 #include <linux/string.h>
 23 #include <linux/file.h>
 24 #include <linux/fcntl.h>
 25 #include <linux/slab.h>
 26 #include <linux/pagemap.h>
 27 #include <linux/security.h>
 28 #include <linux/highmem.h>
 29 #include <linux/highuid.h>
 30 #include <linux/personality.h>
 31 #include <linux/ptrace.h>
 32 #include <linux/init.h>
 33 #include <linux/elf.h>
 34 #include <linux/elf-fdpic.h>
 35 #include <linux/elfcore.h>
 36 #include <linux/coredump.h>
 37 #include <linux/dax.h>
 38 
 39 #include <linux/uaccess.h>
 40 #include <asm/param.h>
 41 #include <asm/pgalloc.h>
 42 
 43 typedef char *elf_caddr_t;
 44 
 45 #if 0
 46 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
 47 #else
 48 #define kdebug(fmt, ...) do {} while(0)
 49 #endif
 50 
 51 #if 0
 52 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
 53 #else
 54 #define kdcore(fmt, ...) do {} while(0)
 55 #endif
 56 
 57 MODULE_LICENSE("GPL");
 58 
 59 static int load_elf_fdpic_binary(struct linux_binprm *);
 60 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
 61 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
 62                               struct mm_struct *, const char *);
 63 
 64 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
 65                                    struct elf_fdpic_params *,
 66                                    struct elf_fdpic_params *);
 67 
 68 #ifndef CONFIG_MMU
 69 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
 70                                                    struct file *,
 71                                                    struct mm_struct *);
 72 #endif
 73 
 74 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
 75                                              struct file *, struct mm_struct *);
 76 
 77 #ifdef CONFIG_ELF_CORE
 78 static int elf_fdpic_core_dump(struct coredump_params *cprm);
 79 #endif
 80 
 81 static struct linux_binfmt elf_fdpic_format = {
 82         .module         = THIS_MODULE,
 83         .load_binary    = load_elf_fdpic_binary,
 84 #ifdef CONFIG_ELF_CORE
 85         .core_dump      = elf_fdpic_core_dump,
 86 #endif
 87         .min_coredump   = ELF_EXEC_PAGESIZE,
 88 };
 89 
 90 static int __init init_elf_fdpic_binfmt(void)
 91 {
 92         register_binfmt(&elf_fdpic_format);
 93         return 0;
 94 }
 95 
 96 static void __exit exit_elf_fdpic_binfmt(void)
 97 {
 98         unregister_binfmt(&elf_fdpic_format);
 99 }
100 
101 core_initcall(init_elf_fdpic_binfmt);
102 module_exit(exit_elf_fdpic_binfmt);
103 
104 static int is_elf(struct elfhdr *hdr, struct file *file)
105 {
106         if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
107                 return 0;
108         if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
109                 return 0;
110         if (!elf_check_arch(hdr))
111                 return 0;
112         if (!file->f_op->mmap)
113                 return 0;
114         return 1;
115 }
116 
117 #ifndef elf_check_fdpic
118 #define elf_check_fdpic(x) 0
119 #endif
120 
121 #ifndef elf_check_const_displacement
122 #define elf_check_const_displacement(x) 0
123 #endif
124 
125 static int is_constdisp(struct elfhdr *hdr)
126 {
127         if (!elf_check_fdpic(hdr))
128                 return 1;
129         if (elf_check_const_displacement(hdr))
130                 return 1;
131         return 0;
132 }
133 
134 /*****************************************************************************/
135 /*
136  * read the program headers table into memory
137  */
138 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
139                                  struct file *file)
140 {
141         struct elf32_phdr *phdr;
142         unsigned long size;
143         int retval, loop;
144         loff_t pos = params->hdr.e_phoff;
145 
146         if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
147                 return -ENOMEM;
148         if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
149                 return -ENOMEM;
150 
151         size = params->hdr.e_phnum * sizeof(struct elf_phdr);
152         params->phdrs = kmalloc(size, GFP_KERNEL);
153         if (!params->phdrs)
154                 return -ENOMEM;
155 
156         retval = kernel_read(file, params->phdrs, size, &pos);
157         if (unlikely(retval != size))
158                 return retval < 0 ? retval : -ENOEXEC;
159 
160         /* determine stack size for this binary */
161         phdr = params->phdrs;
162         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
163                 if (phdr->p_type != PT_GNU_STACK)
164                         continue;
165 
166                 if (phdr->p_flags & PF_X)
167                         params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
168                 else
169                         params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
170 
171                 params->stack_size = phdr->p_memsz;
172                 break;
173         }
174 
175         return 0;
176 }
177 
178 /*****************************************************************************/
179 /*
180  * load an fdpic binary into various bits of memory
181  */
182 static int load_elf_fdpic_binary(struct linux_binprm *bprm)
183 {
184         struct elf_fdpic_params exec_params, interp_params;
185         struct pt_regs *regs = current_pt_regs();
186         struct elf_phdr *phdr;
187         unsigned long stack_size, entryaddr;
188 #ifdef ELF_FDPIC_PLAT_INIT
189         unsigned long dynaddr;
190 #endif
191 #ifndef CONFIG_MMU
192         unsigned long stack_prot;
193 #endif
194         struct file *interpreter = NULL; /* to shut gcc up */
195         char *interpreter_name = NULL;
196         int executable_stack;
197         int retval, i;
198         loff_t pos;
199 
200         kdebug("____ LOAD %d ____", current->pid);
201 
202         memset(&exec_params, 0, sizeof(exec_params));
203         memset(&interp_params, 0, sizeof(interp_params));
204 
205         exec_params.hdr = *(struct elfhdr *) bprm->buf;
206         exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
207 
208         /* check that this is a binary we know how to deal with */
209         retval = -ENOEXEC;
210         if (!is_elf(&exec_params.hdr, bprm->file))
211                 goto error;
212         if (!elf_check_fdpic(&exec_params.hdr)) {
213 #ifdef CONFIG_MMU
214                 /* binfmt_elf handles non-fdpic elf except on nommu */
215                 goto error;
216 #else
217                 /* nommu can only load ET_DYN (PIE) ELF */
218                 if (exec_params.hdr.e_type != ET_DYN)
219                         goto error;
220 #endif
221         }
222 
223         /* read the program header table */
224         retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
225         if (retval < 0)
226                 goto error;
227 
228         /* scan for a program header that specifies an interpreter */
229         phdr = exec_params.phdrs;
230 
231         for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
232                 switch (phdr->p_type) {
233                 case PT_INTERP:
234                         retval = -ENOMEM;
235                         if (phdr->p_filesz > PATH_MAX)
236                                 goto error;
237                         retval = -ENOENT;
238                         if (phdr->p_filesz < 2)
239                                 goto error;
240 
241                         /* read the name of the interpreter into memory */
242                         interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
243                         if (!interpreter_name)
244                                 goto error;
245 
246                         pos = phdr->p_offset;
247                         retval = kernel_read(bprm->file, interpreter_name,
248                                              phdr->p_filesz, &pos);
249                         if (unlikely(retval != phdr->p_filesz)) {
250                                 if (retval >= 0)
251                                         retval = -ENOEXEC;
252                                 goto error;
253                         }
254 
255                         retval = -ENOENT;
256                         if (interpreter_name[phdr->p_filesz - 1] != '\0')
257                                 goto error;
258 
259                         kdebug("Using ELF interpreter %s", interpreter_name);
260 
261                         /* replace the program with the interpreter */
262                         interpreter = open_exec(interpreter_name);
263                         retval = PTR_ERR(interpreter);
264                         if (IS_ERR(interpreter)) {
265                                 interpreter = NULL;
266                                 goto error;
267                         }
268 
269                         /*
270                          * If the binary is not readable then enforce
271                          * mm->dumpable = 0 regardless of the interpreter's
272                          * permissions.
273                          */
274                         would_dump(bprm, interpreter);
275 
276                         pos = 0;
277                         retval = kernel_read(interpreter, bprm->buf,
278                                         BINPRM_BUF_SIZE, &pos);
279                         if (unlikely(retval != BINPRM_BUF_SIZE)) {
280                                 if (retval >= 0)
281                                         retval = -ENOEXEC;
282                                 goto error;
283                         }
284 
285                         interp_params.hdr = *((struct elfhdr *) bprm->buf);
286                         break;
287 
288                 case PT_LOAD:
289 #ifdef CONFIG_MMU
290                         if (exec_params.load_addr == 0)
291                                 exec_params.load_addr = phdr->p_vaddr;
292 #endif
293                         break;
294                 }
295 
296         }
297 
298         if (is_constdisp(&exec_params.hdr))
299                 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
300 
301         /* perform insanity checks on the interpreter */
302         if (interpreter_name) {
303                 retval = -ELIBBAD;
304                 if (!is_elf(&interp_params.hdr, interpreter))
305                         goto error;
306 
307                 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
308 
309                 /* read the interpreter's program header table */
310                 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
311                 if (retval < 0)
312                         goto error;
313         }
314 
315         stack_size = exec_params.stack_size;
316         if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
317                 executable_stack = EXSTACK_ENABLE_X;
318         else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
319                 executable_stack = EXSTACK_DISABLE_X;
320         else
321                 executable_stack = EXSTACK_DEFAULT;
322 
323         if (stack_size == 0) {
324                 stack_size = interp_params.stack_size;
325                 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
326                         executable_stack = EXSTACK_ENABLE_X;
327                 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
328                         executable_stack = EXSTACK_DISABLE_X;
329                 else
330                         executable_stack = EXSTACK_DEFAULT;
331         }
332 
333         retval = -ENOEXEC;
334         if (stack_size == 0)
335                 stack_size = 131072UL; /* same as exec.c's default commit */
336 
337         if (is_constdisp(&interp_params.hdr))
338                 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
339 
340         /* flush all traces of the currently running executable */
341         retval = flush_old_exec(bprm);
342         if (retval)
343                 goto error;
344 
345         /* there's now no turning back... the old userspace image is dead,
346          * defunct, deceased, etc.
347          */
348         if (elf_check_fdpic(&exec_params.hdr))
349                 set_personality(PER_LINUX_FDPIC);
350         else
351                 set_personality(PER_LINUX);
352         if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
353                 current->personality |= READ_IMPLIES_EXEC;
354 
355         setup_new_exec(bprm);
356 
357         set_binfmt(&elf_fdpic_format);
358 
359         current->mm->start_code = 0;
360         current->mm->end_code = 0;
361         current->mm->start_stack = 0;
362         current->mm->start_data = 0;
363         current->mm->end_data = 0;
364         current->mm->context.exec_fdpic_loadmap = 0;
365         current->mm->context.interp_fdpic_loadmap = 0;
366 
367 #ifdef CONFIG_MMU
368         elf_fdpic_arch_lay_out_mm(&exec_params,
369                                   &interp_params,
370                                   &current->mm->start_stack,
371                                   &current->mm->start_brk);
372 
373         retval = setup_arg_pages(bprm, current->mm->start_stack,
374                                  executable_stack);
375         if (retval < 0)
376                 goto error;
377 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
378         retval = arch_setup_additional_pages(bprm, !!interpreter_name);
379         if (retval < 0)
380                 goto error;
381 #endif
382 #endif
383 
384         /* load the executable and interpreter into memory */
385         retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
386                                     "executable");
387         if (retval < 0)
388                 goto error;
389 
390         if (interpreter_name) {
391                 retval = elf_fdpic_map_file(&interp_params, interpreter,
392                                             current->mm, "interpreter");
393                 if (retval < 0) {
394                         printk(KERN_ERR "Unable to load interpreter\n");
395                         goto error;
396                 }
397 
398                 allow_write_access(interpreter);
399                 fput(interpreter);
400                 interpreter = NULL;
401         }
402 
403 #ifdef CONFIG_MMU
404         if (!current->mm->start_brk)
405                 current->mm->start_brk = current->mm->end_data;
406 
407         current->mm->brk = current->mm->start_brk =
408                 PAGE_ALIGN(current->mm->start_brk);
409 
410 #else
411         /* create a stack area and zero-size brk area */
412         stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
413         if (stack_size < PAGE_SIZE * 2)
414                 stack_size = PAGE_SIZE * 2;
415 
416         stack_prot = PROT_READ | PROT_WRITE;
417         if (executable_stack == EXSTACK_ENABLE_X ||
418             (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
419                 stack_prot |= PROT_EXEC;
420 
421         current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,
422                                          MAP_PRIVATE | MAP_ANONYMOUS |
423                                          MAP_UNINITIALIZED | MAP_GROWSDOWN,
424                                          0);
425 
426         if (IS_ERR_VALUE(current->mm->start_brk)) {
427                 retval = current->mm->start_brk;
428                 current->mm->start_brk = 0;
429                 goto error;
430         }
431 
432         current->mm->brk = current->mm->start_brk;
433         current->mm->context.end_brk = current->mm->start_brk;
434         current->mm->start_stack = current->mm->start_brk + stack_size;
435 #endif
436 
437         install_exec_creds(bprm);
438         if (create_elf_fdpic_tables(bprm, current->mm,
439                                     &exec_params, &interp_params) < 0)
440                 goto error;
441 
442         kdebug("- start_code  %lx", current->mm->start_code);
443         kdebug("- end_code    %lx", current->mm->end_code);
444         kdebug("- start_data  %lx", current->mm->start_data);
445         kdebug("- end_data    %lx", current->mm->end_data);
446         kdebug("- start_brk   %lx", current->mm->start_brk);
447         kdebug("- brk         %lx", current->mm->brk);
448         kdebug("- start_stack %lx", current->mm->start_stack);
449 
450 #ifdef ELF_FDPIC_PLAT_INIT
451         /*
452          * The ABI may specify that certain registers be set up in special
453          * ways (on i386 %edx is the address of a DT_FINI function, for
454          * example.  This macro performs whatever initialization to
455          * the regs structure is required.
456          */
457         dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
458         ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
459                             dynaddr);
460 #endif
461 
462         finalize_exec(bprm);
463         /* everything is now ready... get the userspace context ready to roll */
464         entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
465         start_thread(regs, entryaddr, current->mm->start_stack);
466 
467         retval = 0;
468 
469 error:
470         if (interpreter) {
471                 allow_write_access(interpreter);
472                 fput(interpreter);
473         }
474         kfree(interpreter_name);
475         kfree(exec_params.phdrs);
476         kfree(exec_params.loadmap);
477         kfree(interp_params.phdrs);
478         kfree(interp_params.loadmap);
479         return retval;
480 }
481 
482 /*****************************************************************************/
483 
484 #ifndef ELF_BASE_PLATFORM
485 /*
486  * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
487  * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
488  * will be copied to the user stack in the same manner as AT_PLATFORM.
489  */
490 #define ELF_BASE_PLATFORM NULL
491 #endif
492 
493 /*
494  * present useful information to the program by shovelling it onto the new
495  * process's stack
496  */
497 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
498                                    struct mm_struct *mm,
499                                    struct elf_fdpic_params *exec_params,
500                                    struct elf_fdpic_params *interp_params)
501 {
502         const struct cred *cred = current_cred();
503         unsigned long sp, csp, nitems;
504         elf_caddr_t __user *argv, *envp;
505         size_t platform_len = 0, len;
506         char *k_platform, *k_base_platform;
507         char __user *u_platform, *u_base_platform, *p;
508         int loop;
509         int nr; /* reset for each csp adjustment */
510 
511 #ifdef CONFIG_MMU
512         /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
513          * by the processes running on the same package. One thing we can do is
514          * to shuffle the initial stack for them, so we give the architecture
515          * an opportunity to do so here.
516          */
517         sp = arch_align_stack(bprm->p);
518 #else
519         sp = mm->start_stack;
520 
521         /* stack the program arguments and environment */
522         if (transfer_args_to_stack(bprm, &sp) < 0)
523                 return -EFAULT;
524         sp &= ~15;
525 #endif
526 
527         /*
528          * If this architecture has a platform capability string, copy it
529          * to userspace.  In some cases (Sparc), this info is impossible
530          * for userspace to get any other way, in others (i386) it is
531          * merely difficult.
532          */
533         k_platform = ELF_PLATFORM;
534         u_platform = NULL;
535 
536         if (k_platform) {
537                 platform_len = strlen(k_platform) + 1;
538                 sp -= platform_len;
539                 u_platform = (char __user *) sp;
540                 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
541                         return -EFAULT;
542         }
543 
544         /*
545          * If this architecture has a "base" platform capability
546          * string, copy it to userspace.
547          */
548         k_base_platform = ELF_BASE_PLATFORM;
549         u_base_platform = NULL;
550 
551         if (k_base_platform) {
552                 platform_len = strlen(k_base_platform) + 1;
553                 sp -= platform_len;
554                 u_base_platform = (char __user *) sp;
555                 if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
556                         return -EFAULT;
557         }
558 
559         sp &= ~7UL;
560 
561         /* stack the load map(s) */
562         len = sizeof(struct elf32_fdpic_loadmap);
563         len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
564         sp = (sp - len) & ~7UL;
565         exec_params->map_addr = sp;
566 
567         if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
568                 return -EFAULT;
569 
570         current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
571 
572         if (interp_params->loadmap) {
573                 len = sizeof(struct elf32_fdpic_loadmap);
574                 len += sizeof(struct elf32_fdpic_loadseg) *
575                         interp_params->loadmap->nsegs;
576                 sp = (sp - len) & ~7UL;
577                 interp_params->map_addr = sp;
578 
579                 if (copy_to_user((void __user *) sp, interp_params->loadmap,
580                                  len) != 0)
581                         return -EFAULT;
582 
583                 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
584         }
585 
586         /* force 16 byte _final_ alignment here for generality */
587 #define DLINFO_ITEMS 15
588 
589         nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
590                 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
591 
592         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
593                 nitems++;
594 
595         csp = sp;
596         sp -= nitems * 2 * sizeof(unsigned long);
597         sp -= (bprm->envc + 1) * sizeof(char *);        /* envv[] */
598         sp -= (bprm->argc + 1) * sizeof(char *);        /* argv[] */
599         sp -= 1 * sizeof(unsigned long);                /* argc */
600 
601         csp -= sp & 15UL;
602         sp -= sp & 15UL;
603 
604         /* put the ELF interpreter info on the stack */
605 #define NEW_AUX_ENT(id, val)                                            \
606         do {                                                            \
607                 struct { unsigned long _id, _val; } __user *ent;        \
608                                                                         \
609                 ent = (void __user *) csp;                              \
610                 __put_user((id), &ent[nr]._id);                         \
611                 __put_user((val), &ent[nr]._val);                       \
612                 nr++;                                                   \
613         } while (0)
614 
615         nr = 0;
616         csp -= 2 * sizeof(unsigned long);
617         NEW_AUX_ENT(AT_NULL, 0);
618         if (k_platform) {
619                 nr = 0;
620                 csp -= 2 * sizeof(unsigned long);
621                 NEW_AUX_ENT(AT_PLATFORM,
622                             (elf_addr_t) (unsigned long) u_platform);
623         }
624 
625         if (k_base_platform) {
626                 nr = 0;
627                 csp -= 2 * sizeof(unsigned long);
628                 NEW_AUX_ENT(AT_BASE_PLATFORM,
629                             (elf_addr_t) (unsigned long) u_base_platform);
630         }
631 
632         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
633                 nr = 0;
634                 csp -= 2 * sizeof(unsigned long);
635                 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
636         }
637 
638         nr = 0;
639         csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
640         NEW_AUX_ENT(AT_HWCAP,   ELF_HWCAP);
641 #ifdef ELF_HWCAP2
642         NEW_AUX_ENT(AT_HWCAP2,  ELF_HWCAP2);
643 #endif
644         NEW_AUX_ENT(AT_PAGESZ,  PAGE_SIZE);
645         NEW_AUX_ENT(AT_CLKTCK,  CLOCKS_PER_SEC);
646         NEW_AUX_ENT(AT_PHDR,    exec_params->ph_addr);
647         NEW_AUX_ENT(AT_PHENT,   sizeof(struct elf_phdr));
648         NEW_AUX_ENT(AT_PHNUM,   exec_params->hdr.e_phnum);
649         NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
650         NEW_AUX_ENT(AT_FLAGS,   0);
651         NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
652         NEW_AUX_ENT(AT_UID,     (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
653         NEW_AUX_ENT(AT_EUID,    (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
654         NEW_AUX_ENT(AT_GID,     (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));
655         NEW_AUX_ENT(AT_EGID,    (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
656         NEW_AUX_ENT(AT_SECURE,  bprm->secureexec);
657         NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
658 
659 #ifdef ARCH_DLINFO
660         nr = 0;
661         csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
662 
663         /* ARCH_DLINFO must come last so platform specific code can enforce
664          * special alignment requirements on the AUXV if necessary (eg. PPC).
665          */
666         ARCH_DLINFO;
667 #endif
668 #undef NEW_AUX_ENT
669 
670         /* allocate room for argv[] and envv[] */
671         csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
672         envp = (elf_caddr_t __user *) csp;
673         csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
674         argv = (elf_caddr_t __user *) csp;
675 
676         /* stack argc */
677         csp -= sizeof(unsigned long);
678         __put_user(bprm->argc, (unsigned long __user *) csp);
679 
680         BUG_ON(csp != sp);
681 
682         /* fill in the argv[] array */
683 #ifdef CONFIG_MMU
684         current->mm->arg_start = bprm->p;
685 #else
686         current->mm->arg_start = current->mm->start_stack -
687                 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
688 #endif
689 
690         p = (char __user *) current->mm->arg_start;
691         for (loop = bprm->argc; loop > 0; loop--) {
692                 __put_user((elf_caddr_t) p, argv++);
693                 len = strnlen_user(p, MAX_ARG_STRLEN);
694                 if (!len || len > MAX_ARG_STRLEN)
695                         return -EINVAL;
696                 p += len;
697         }
698         __put_user(NULL, argv);
699         current->mm->arg_end = (unsigned long) p;
700 
701         /* fill in the envv[] array */
702         current->mm->env_start = (unsigned long) p;
703         for (loop = bprm->envc; loop > 0; loop--) {
704                 __put_user((elf_caddr_t)(unsigned long) p, envp++);
705                 len = strnlen_user(p, MAX_ARG_STRLEN);
706                 if (!len || len > MAX_ARG_STRLEN)
707                         return -EINVAL;
708                 p += len;
709         }
710         __put_user(NULL, envp);
711         current->mm->env_end = (unsigned long) p;
712 
713         mm->start_stack = (unsigned long) sp;
714         return 0;
715 }
716 
717 /*****************************************************************************/
718 /*
719  * load the appropriate binary image (executable or interpreter) into memory
720  * - we assume no MMU is available
721  * - if no other PIC bits are set in params->hdr->e_flags
722  *   - we assume that the LOADable segments in the binary are independently relocatable
723  *   - we assume R/O executable segments are shareable
724  * - else
725  *   - we assume the loadable parts of the image to require fixed displacement
726  *   - the image is not shareable
727  */
728 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
729                               struct file *file,
730                               struct mm_struct *mm,
731                               const char *what)
732 {
733         struct elf32_fdpic_loadmap *loadmap;
734 #ifdef CONFIG_MMU
735         struct elf32_fdpic_loadseg *mseg;
736 #endif
737         struct elf32_fdpic_loadseg *seg;
738         struct elf32_phdr *phdr;
739         unsigned long load_addr, stop;
740         unsigned nloads, tmp;
741         size_t size;
742         int loop, ret;
743 
744         /* allocate a load map table */
745         nloads = 0;
746         for (loop = 0; loop < params->hdr.e_phnum; loop++)
747                 if (params->phdrs[loop].p_type == PT_LOAD)
748                         nloads++;
749 
750         if (nloads == 0)
751                 return -ELIBBAD;
752 
753         size = sizeof(*loadmap) + nloads * sizeof(*seg);
754         loadmap = kzalloc(size, GFP_KERNEL);
755         if (!loadmap)
756                 return -ENOMEM;
757 
758         params->loadmap = loadmap;
759 
760         loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
761         loadmap->nsegs = nloads;
762 
763         load_addr = params->load_addr;
764         seg = loadmap->segs;
765 
766         /* map the requested LOADs into the memory space */
767         switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
768         case ELF_FDPIC_FLAG_CONSTDISP:
769         case ELF_FDPIC_FLAG_CONTIGUOUS:
770 #ifndef CONFIG_MMU
771                 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
772                 if (ret < 0)
773                         return ret;
774                 break;
775 #endif
776         default:
777                 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
778                 if (ret < 0)
779                         return ret;
780                 break;
781         }
782 
783         /* map the entry point */
784         if (params->hdr.e_entry) {
785                 seg = loadmap->segs;
786                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
787                         if (params->hdr.e_entry >= seg->p_vaddr &&
788                             params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
789                                 params->entry_addr =
790                                         (params->hdr.e_entry - seg->p_vaddr) +
791                                         seg->addr;
792                                 break;
793                         }
794                 }
795         }
796 
797         /* determine where the program header table has wound up if mapped */
798         stop = params->hdr.e_phoff;
799         stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
800         phdr = params->phdrs;
801 
802         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
803                 if (phdr->p_type != PT_LOAD)
804                         continue;
805 
806                 if (phdr->p_offset > params->hdr.e_phoff ||
807                     phdr->p_offset + phdr->p_filesz < stop)
808                         continue;
809 
810                 seg = loadmap->segs;
811                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
812                         if (phdr->p_vaddr >= seg->p_vaddr &&
813                             phdr->p_vaddr + phdr->p_filesz <=
814                             seg->p_vaddr + seg->p_memsz) {
815                                 params->ph_addr =
816                                         (phdr->p_vaddr - seg->p_vaddr) +
817                                         seg->addr +
818                                         params->hdr.e_phoff - phdr->p_offset;
819                                 break;
820                         }
821                 }
822                 break;
823         }
824 
825         /* determine where the dynamic section has wound up if there is one */
826         phdr = params->phdrs;
827         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
828                 if (phdr->p_type != PT_DYNAMIC)
829                         continue;
830 
831                 seg = loadmap->segs;
832                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
833                         if (phdr->p_vaddr >= seg->p_vaddr &&
834                             phdr->p_vaddr + phdr->p_memsz <=
835                             seg->p_vaddr + seg->p_memsz) {
836                                 Elf32_Dyn __user *dyn;
837                                 Elf32_Sword d_tag;
838 
839                                 params->dynamic_addr =
840                                         (phdr->p_vaddr - seg->p_vaddr) +
841                                         seg->addr;
842 
843                                 /* check the dynamic section contains at least
844                                  * one item, and that the last item is a NULL
845                                  * entry */
846                                 if (phdr->p_memsz == 0 ||
847                                     phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
848                                         goto dynamic_error;
849 
850                                 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
851                                 dyn = (Elf32_Dyn __user *)params->dynamic_addr;
852                                 __get_user(d_tag, &dyn[tmp - 1].d_tag);
853                                 if (d_tag != 0)
854                                         goto dynamic_error;
855                                 break;
856                         }
857                 }
858                 break;
859         }
860 
861         /* now elide adjacent segments in the load map on MMU linux
862          * - on uClinux the holes between may actually be filled with system
863          *   stuff or stuff from other processes
864          */
865 #ifdef CONFIG_MMU
866         nloads = loadmap->nsegs;
867         mseg = loadmap->segs;
868         seg = mseg + 1;
869         for (loop = 1; loop < nloads; loop++) {
870                 /* see if we have a candidate for merging */
871                 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
872                         load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
873                         if (load_addr == (seg->addr & PAGE_MASK)) {
874                                 mseg->p_memsz +=
875                                         load_addr -
876                                         (mseg->addr + mseg->p_memsz);
877                                 mseg->p_memsz += seg->addr & ~PAGE_MASK;
878                                 mseg->p_memsz += seg->p_memsz;
879                                 loadmap->nsegs--;
880                                 continue;
881                         }
882                 }
883 
884                 mseg++;
885                 if (mseg != seg)
886                         *mseg = *seg;
887         }
888 #endif
889 
890         kdebug("Mapped Object [%s]:", what);
891         kdebug("- elfhdr   : %lx", params->elfhdr_addr);
892         kdebug("- entry    : %lx", params->entry_addr);
893         kdebug("- PHDR[]   : %lx", params->ph_addr);
894         kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
895         seg = loadmap->segs;
896         for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
897                 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
898                        loop,
899                        seg->addr, seg->addr + seg->p_memsz - 1,
900                        seg->p_vaddr, seg->p_memsz);
901 
902         return 0;
903 
904 dynamic_error:
905         printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
906                what, file_inode(file)->i_ino);
907         return -ELIBBAD;
908 }
909 
910 /*****************************************************************************/
911 /*
912  * map a file with constant displacement under uClinux
913  */
914 #ifndef CONFIG_MMU
915 static int elf_fdpic_map_file_constdisp_on_uclinux(
916         struct elf_fdpic_params *params,
917         struct file *file,
918         struct mm_struct *mm)
919 {
920         struct elf32_fdpic_loadseg *seg;
921         struct elf32_phdr *phdr;
922         unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
923         int loop, ret;
924 
925         load_addr = params->load_addr;
926         seg = params->loadmap->segs;
927 
928         /* determine the bounds of the contiguous overall allocation we must
929          * make */
930         phdr = params->phdrs;
931         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
932                 if (params->phdrs[loop].p_type != PT_LOAD)
933                         continue;
934 
935                 if (base > phdr->p_vaddr)
936                         base = phdr->p_vaddr;
937                 if (top < phdr->p_vaddr + phdr->p_memsz)
938                         top = phdr->p_vaddr + phdr->p_memsz;
939         }
940 
941         /* allocate one big anon block for everything */
942         mflags = MAP_PRIVATE;
943         if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
944                 mflags |= MAP_EXECUTABLE;
945 
946         maddr = vm_mmap(NULL, load_addr, top - base,
947                         PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
948         if (IS_ERR_VALUE(maddr))
949                 return (int) maddr;
950 
951         if (load_addr != 0)
952                 load_addr += PAGE_ALIGN(top - base);
953 
954         /* and then load the file segments into it */
955         phdr = params->phdrs;
956         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
957                 if (params->phdrs[loop].p_type != PT_LOAD)
958                         continue;
959 
960                 seg->addr = maddr + (phdr->p_vaddr - base);
961                 seg->p_vaddr = phdr->p_vaddr;
962                 seg->p_memsz = phdr->p_memsz;
963 
964                 ret = read_code(file, seg->addr, phdr->p_offset,
965                                        phdr->p_filesz);
966                 if (ret < 0)
967                         return ret;
968 
969                 /* map the ELF header address if in this segment */
970                 if (phdr->p_offset == 0)
971                         params->elfhdr_addr = seg->addr;
972 
973                 /* clear any space allocated but not loaded */
974                 if (phdr->p_filesz < phdr->p_memsz) {
975                         if (clear_user((void *) (seg->addr + phdr->p_filesz),
976                                        phdr->p_memsz - phdr->p_filesz))
977                                 return -EFAULT;
978                 }
979 
980                 if (mm) {
981                         if (phdr->p_flags & PF_X) {
982                                 if (!mm->start_code) {
983                                         mm->start_code = seg->addr;
984                                         mm->end_code = seg->addr +
985                                                 phdr->p_memsz;
986                                 }
987                         } else if (!mm->start_data) {
988                                 mm->start_data = seg->addr;
989                                 mm->end_data = seg->addr + phdr->p_memsz;
990                         }
991                 }
992 
993                 seg++;
994         }
995 
996         return 0;
997 }
998 #endif
999 
1000 /*****************************************************************************/
1001 /*
1002  * map a binary by direct mmap() of the individual PT_LOAD segments
1003  */
1004 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1005                                              struct file *file,
1006                                              struct mm_struct *mm)
1007 {
1008         struct elf32_fdpic_loadseg *seg;
1009         struct elf32_phdr *phdr;
1010         unsigned long load_addr, delta_vaddr;
1011         int loop, dvset;
1012 
1013         load_addr = params->load_addr;
1014         delta_vaddr = 0;
1015         dvset = 0;
1016 
1017         seg = params->loadmap->segs;
1018 
1019         /* deal with each load segment separately */
1020         phdr = params->phdrs;
1021         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1022                 unsigned long maddr, disp, excess, excess1;
1023                 int prot = 0, flags;
1024 
1025                 if (phdr->p_type != PT_LOAD)
1026                         continue;
1027 
1028                 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1029                        (unsigned long) phdr->p_vaddr,
1030                        (unsigned long) phdr->p_offset,
1031                        (unsigned long) phdr->p_filesz,
1032                        (unsigned long) phdr->p_memsz);
1033 
1034                 /* determine the mapping parameters */
1035                 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1036                 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1037                 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1038 
1039                 flags = MAP_PRIVATE | MAP_DENYWRITE;
1040                 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1041                         flags |= MAP_EXECUTABLE;
1042 
1043                 maddr = 0;
1044 
1045                 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1046                 case ELF_FDPIC_FLAG_INDEPENDENT:
1047                         /* PT_LOADs are independently locatable */
1048                         break;
1049 
1050                 case ELF_FDPIC_FLAG_HONOURVADDR:
1051                         /* the specified virtual address must be honoured */
1052                         maddr = phdr->p_vaddr;
1053                         flags |= MAP_FIXED;
1054                         break;
1055 
1056                 case ELF_FDPIC_FLAG_CONSTDISP:
1057                         /* constant displacement
1058                          * - can be mapped anywhere, but must be mapped as a
1059                          *   unit
1060                          */
1061                         if (!dvset) {
1062                                 maddr = load_addr;
1063                                 delta_vaddr = phdr->p_vaddr;
1064                                 dvset = 1;
1065                         } else {
1066                                 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1067                                 flags |= MAP_FIXED;
1068                         }
1069                         break;
1070 
1071                 case ELF_FDPIC_FLAG_CONTIGUOUS:
1072                         /* contiguity handled later */
1073                         break;
1074 
1075                 default:
1076                         BUG();
1077                 }
1078 
1079                 maddr &= PAGE_MASK;
1080 
1081                 /* create the mapping */
1082                 disp = phdr->p_vaddr & ~PAGE_MASK;
1083                 maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1084                                 phdr->p_offset - disp);
1085 
1086                 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1087                        loop, phdr->p_memsz + disp, prot, flags,
1088                        phdr->p_offset - disp, maddr);
1089 
1090                 if (IS_ERR_VALUE(maddr))
1091                         return (int) maddr;
1092 
1093                 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1094                     ELF_FDPIC_FLAG_CONTIGUOUS)
1095                         load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1096 
1097                 seg->addr = maddr + disp;
1098                 seg->p_vaddr = phdr->p_vaddr;
1099                 seg->p_memsz = phdr->p_memsz;
1100 
1101                 /* map the ELF header address if in this segment */
1102                 if (phdr->p_offset == 0)
1103                         params->elfhdr_addr = seg->addr;
1104 
1105                 /* clear the bit between beginning of mapping and beginning of
1106                  * PT_LOAD */
1107                 if (prot & PROT_WRITE && disp > 0) {
1108                         kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1109                         if (clear_user((void __user *) maddr, disp))
1110                                 return -EFAULT;
1111                         maddr += disp;
1112                 }
1113 
1114                 /* clear any space allocated but not loaded
1115                  * - on uClinux we can just clear the lot
1116                  * - on MMU linux we'll get a SIGBUS beyond the last page
1117                  *   extant in the file
1118                  */
1119                 excess = phdr->p_memsz - phdr->p_filesz;
1120                 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1121 
1122 #ifdef CONFIG_MMU
1123                 if (excess > excess1) {
1124                         unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1125                         unsigned long xmaddr;
1126 
1127                         flags |= MAP_FIXED | MAP_ANONYMOUS;
1128                         xmaddr = vm_mmap(NULL, xaddr, excess - excess1,
1129                                          prot, flags, 0);
1130 
1131                         kdebug("mmap[%d] <anon>"
1132                                " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1133                                loop, xaddr, excess - excess1, prot, flags,
1134                                xmaddr);
1135 
1136                         if (xmaddr != xaddr)
1137                                 return -ENOMEM;
1138                 }
1139 
1140                 if (prot & PROT_WRITE && excess1 > 0) {
1141                         kdebug("clear[%d] ad=%lx sz=%lx",
1142                                loop, maddr + phdr->p_filesz, excess1);
1143                         if (clear_user((void __user *) maddr + phdr->p_filesz,
1144                                        excess1))
1145                                 return -EFAULT;
1146                 }
1147 
1148 #else
1149                 if (excess > 0) {
1150                         kdebug("clear[%d] ad=%lx sz=%lx",
1151                                loop, maddr + phdr->p_filesz, excess);
1152                         if (clear_user((void *) maddr + phdr->p_filesz, excess))
1153                                 return -EFAULT;
1154                 }
1155 #endif
1156 
1157                 if (mm) {
1158                         if (phdr->p_flags & PF_X) {
1159                                 if (!mm->start_code) {
1160                                         mm->start_code = maddr;
1161                                         mm->end_code = maddr + phdr->p_memsz;
1162                                 }
1163                         } else if (!mm->start_data) {
1164                                 mm->start_data = maddr;
1165                                 mm->end_data = maddr + phdr->p_memsz;
1166                         }
1167                 }
1168 
1169                 seg++;
1170         }
1171 
1172         return 0;
1173 }
1174 
1175 /*****************************************************************************/
1176 /*
1177  * ELF-FDPIC core dumper
1178  *
1179  * Modelled on fs/exec.c:aout_core_dump()
1180  * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1181  *
1182  * Modelled on fs/binfmt_elf.c core dumper
1183  */
1184 #ifdef CONFIG_ELF_CORE
1185 
1186 /*
1187  * Decide whether a segment is worth dumping; default is yes to be
1188  * sure (missing info is worse than too much; etc).
1189  * Personally I'd include everything, and use the coredump limit...
1190  *
1191  * I think we should skip something. But I am not sure how. H.J.
1192  */
1193 static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
1194 {
1195         int dump_ok;
1196 
1197         /* Do not dump I/O mapped devices or special mappings */
1198         if (vma->vm_flags & VM_IO) {
1199                 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1200                 return 0;
1201         }
1202 
1203         /* If we may not read the contents, don't allow us to dump
1204          * them either. "dump_write()" can't handle it anyway.
1205          */
1206         if (!(vma->vm_flags & VM_READ)) {
1207                 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1208                 return 0;
1209         }
1210 
1211         /* support for DAX */
1212         if (vma_is_dax(vma)) {
1213                 if (vma->vm_flags & VM_SHARED) {
1214                         dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags);
1215                         kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start,
1216                                vma->vm_flags, dump_ok ? "yes" : "no");
1217                 } else {
1218                         dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags);
1219                         kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start,
1220                                vma->vm_flags, dump_ok ? "yes" : "no");
1221                 }
1222                 return dump_ok;
1223         }
1224 
1225         /* By default, dump shared memory if mapped from an anonymous file. */
1226         if (vma->vm_flags & VM_SHARED) {
1227                 if (file_inode(vma->vm_file)->i_nlink == 0) {
1228                         dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
1229                         kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1230                                vma->vm_flags, dump_ok ? "yes" : "no");
1231                         return dump_ok;
1232                 }
1233 
1234                 dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
1235                 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1236                        vma->vm_flags, dump_ok ? "yes" : "no");
1237                 return dump_ok;
1238         }
1239 
1240 #ifdef CONFIG_MMU
1241         /* By default, if it hasn't been written to, don't write it out */
1242         if (!vma->anon_vma) {
1243                 dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
1244                 kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
1245                        vma->vm_flags, dump_ok ? "yes" : "no");
1246                 return dump_ok;
1247         }
1248 #endif
1249 
1250         dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
1251         kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
1252                dump_ok ? "yes" : "no");
1253         return dump_ok;
1254 }
1255 
1256 /* An ELF note in memory */
1257 struct memelfnote
1258 {
1259         const char *name;
1260         int type;
1261         unsigned int datasz;
1262         void *data;
1263 };
1264 
1265 static int notesize(struct memelfnote *en)
1266 {
1267         int sz;
1268 
1269         sz = sizeof(struct elf_note);
1270         sz += roundup(strlen(en->name) + 1, 4);
1271         sz += roundup(en->datasz, 4);
1272 
1273         return sz;
1274 }
1275 
1276 /* #define DEBUG */
1277 
1278 static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1279 {
1280         struct elf_note en;
1281         en.n_namesz = strlen(men->name) + 1;
1282         en.n_descsz = men->datasz;
1283         en.n_type = men->type;
1284 
1285         return dump_emit(cprm, &en, sizeof(en)) &&
1286                 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1287                 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1288 }
1289 
1290 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1291 {
1292         memcpy(elf->e_ident, ELFMAG, SELFMAG);
1293         elf->e_ident[EI_CLASS] = ELF_CLASS;
1294         elf->e_ident[EI_DATA] = ELF_DATA;
1295         elf->e_ident[EI_VERSION] = EV_CURRENT;
1296         elf->e_ident[EI_OSABI] = ELF_OSABI;
1297         memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1298 
1299         elf->e_type = ET_CORE;
1300         elf->e_machine = ELF_ARCH;
1301         elf->e_version = EV_CURRENT;
1302         elf->e_entry = 0;
1303         elf->e_phoff = sizeof(struct elfhdr);
1304         elf->e_shoff = 0;
1305         elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1306         elf->e_ehsize = sizeof(struct elfhdr);
1307         elf->e_phentsize = sizeof(struct elf_phdr);
1308         elf->e_phnum = segs;
1309         elf->e_shentsize = 0;
1310         elf->e_shnum = 0;
1311         elf->e_shstrndx = 0;
1312         return;
1313 }
1314 
1315 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1316 {
1317         phdr->p_type = PT_NOTE;
1318         phdr->p_offset = offset;
1319         phdr->p_vaddr = 0;
1320         phdr->p_paddr = 0;
1321         phdr->p_filesz = sz;
1322         phdr->p_memsz = 0;
1323         phdr->p_flags = 0;
1324         phdr->p_align = 0;
1325         return;
1326 }
1327 
1328 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1329                 unsigned int sz, void *data)
1330 {
1331         note->name = name;
1332         note->type = type;
1333         note->datasz = sz;
1334         note->data = data;
1335         return;
1336 }
1337 
1338 /*
1339  * fill up all the fields in prstatus from the given task struct, except
1340  * registers which need to be filled up separately.
1341  */
1342 static void fill_prstatus(struct elf_prstatus *prstatus,
1343                           struct task_struct *p, long signr)
1344 {
1345         prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1346         prstatus->pr_sigpend = p->pending.signal.sig[0];
1347         prstatus->pr_sighold = p->blocked.sig[0];
1348         rcu_read_lock();
1349         prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1350         rcu_read_unlock();
1351         prstatus->pr_pid = task_pid_vnr(p);
1352         prstatus->pr_pgrp = task_pgrp_vnr(p);
1353         prstatus->pr_sid = task_session_vnr(p);
1354         if (thread_group_leader(p)) {
1355                 struct task_cputime cputime;
1356 
1357                 /*
1358                  * This is the record for the group leader.  It shows the
1359                  * group-wide total, not its individual thread total.
1360                  */
1361                 thread_group_cputime(p, &cputime);
1362                 prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime);
1363                 prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime);
1364         } else {
1365                 u64 utime, stime;
1366 
1367                 task_cputime(p, &utime, &stime);
1368                 prstatus->pr_utime = ns_to_kernel_old_timeval(utime);
1369                 prstatus->pr_stime = ns_to_kernel_old_timeval(stime);
1370         }
1371         prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime);
1372         prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime);
1373 
1374         prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1375         prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1376 }
1377 
1378 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1379                        struct mm_struct *mm)
1380 {
1381         const struct cred *cred;
1382         unsigned int i, len;
1383 
1384         /* first copy the parameters from user space */
1385         memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1386 
1387         len = mm->arg_end - mm->arg_start;
1388         if (len >= ELF_PRARGSZ)
1389                 len = ELF_PRARGSZ - 1;
1390         if (copy_from_user(&psinfo->pr_psargs,
1391                            (const char __user *) mm->arg_start, len))
1392                 return -EFAULT;
1393         for (i = 0; i < len; i++)
1394                 if (psinfo->pr_psargs[i] == 0)
1395                         psinfo->pr_psargs[i] = ' ';
1396         psinfo->pr_psargs[len] = 0;
1397 
1398         rcu_read_lock();
1399         psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1400         rcu_read_unlock();
1401         psinfo->pr_pid = task_pid_vnr(p);
1402         psinfo->pr_pgrp = task_pgrp_vnr(p);
1403         psinfo->pr_sid = task_session_vnr(p);
1404 
1405         i = p->state ? ffz(~p->state) + 1 : 0;
1406         psinfo->pr_state = i;
1407         psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1408         psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1409         psinfo->pr_nice = task_nice(p);
1410         psinfo->pr_flag = p->flags;
1411         rcu_read_lock();
1412         cred = __task_cred(p);
1413         SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1414         SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1415         rcu_read_unlock();
1416         strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1417 
1418         return 0;
1419 }
1420 
1421 /* Here is the structure in which status of each thread is captured. */
1422 struct elf_thread_status
1423 {
1424         struct list_head list;
1425         struct elf_prstatus prstatus;   /* NT_PRSTATUS */
1426         elf_fpregset_t fpu;             /* NT_PRFPREG */
1427         struct task_struct *thread;
1428 #ifdef ELF_CORE_COPY_XFPREGS
1429         elf_fpxregset_t xfpu;           /* ELF_CORE_XFPREG_TYPE */
1430 #endif
1431         struct memelfnote notes[3];
1432         int num_notes;
1433 };
1434 
1435 /*
1436  * In order to add the specific thread information for the elf file format,
1437  * we need to keep a linked list of every thread's pr_status and then create
1438  * a single section for them in the final core file.
1439  */
1440 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1441 {
1442         struct task_struct *p = t->thread;
1443         int sz = 0;
1444 
1445         t->num_notes = 0;
1446 
1447         fill_prstatus(&t->prstatus, p, signr);
1448         elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1449 
1450         fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1451                   &t->prstatus);
1452         t->num_notes++;
1453         sz += notesize(&t->notes[0]);
1454 
1455         t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1456         if (t->prstatus.pr_fpvalid) {
1457                 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1458                           &t->fpu);
1459                 t->num_notes++;
1460                 sz += notesize(&t->notes[1]);
1461         }
1462 
1463 #ifdef ELF_CORE_COPY_XFPREGS
1464         if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1465                 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1466                           sizeof(t->xfpu), &t->xfpu);
1467                 t->num_notes++;
1468                 sz += notesize(&t->notes[2]);
1469         }
1470 #endif
1471         return sz;
1472 }
1473 
1474 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1475                              elf_addr_t e_shoff, int segs)
1476 {
1477         elf->e_shoff = e_shoff;
1478         elf->e_shentsize = sizeof(*shdr4extnum);
1479         elf->e_shnum = 1;
1480         elf->e_shstrndx = SHN_UNDEF;
1481 
1482         memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1483 
1484         shdr4extnum->sh_type = SHT_NULL;
1485         shdr4extnum->sh_size = elf->e_shnum;
1486         shdr4extnum->sh_link = elf->e_shstrndx;
1487         shdr4extnum->sh_info = segs;
1488 }
1489 
1490 /*
1491  * dump the segments for an MMU process
1492  */
1493 static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
1494 {
1495         struct vm_area_struct *vma;
1496 
1497         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1498 #ifdef CONFIG_MMU
1499                 unsigned long addr;
1500 #endif
1501 
1502                 if (!maydump(vma, cprm->mm_flags))
1503                         continue;
1504 
1505 #ifdef CONFIG_MMU
1506                 for (addr = vma->vm_start; addr < vma->vm_end;
1507                                                         addr += PAGE_SIZE) {
1508                         bool res;
1509                         struct page *page = get_dump_page(addr);
1510                         if (page) {
1511                                 void *kaddr = kmap(page);
1512                                 res = dump_emit(cprm, kaddr, PAGE_SIZE);
1513                                 kunmap(page);
1514                                 put_page(page);
1515                         } else {
1516                                 res = dump_skip(cprm, PAGE_SIZE);
1517                         }
1518                         if (!res)
1519                                 return false;
1520                 }
1521 #else
1522                 if (!dump_emit(cprm, (void *) vma->vm_start,
1523                                 vma->vm_end - vma->vm_start))
1524                         return false;
1525 #endif
1526         }
1527         return true;
1528 }
1529 
1530 static size_t elf_core_vma_data_size(unsigned long mm_flags)
1531 {
1532         struct vm_area_struct *vma;
1533         size_t size = 0;
1534 
1535         for (vma = current->mm->mmap; vma; vma = vma->vm_next)
1536                 if (maydump(vma, mm_flags))
1537                         size += vma->vm_end - vma->vm_start;
1538         return size;
1539 }
1540 
1541 /*
1542  * Actual dumper
1543  *
1544  * This is a two-pass process; first we find the offsets of the bits,
1545  * and then they are actually written out.  If we run out of core limit
1546  * we just truncate.
1547  */
1548 static int elf_fdpic_core_dump(struct coredump_params *cprm)
1549 {
1550 #define NUM_NOTES       6
1551         int has_dumped = 0;
1552         mm_segment_t fs;
1553         int segs;
1554         int i;
1555         struct vm_area_struct *vma;
1556         struct elfhdr *elf = NULL;
1557         loff_t offset = 0, dataoff;
1558         int numnote;
1559         struct memelfnote *notes = NULL;
1560         struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
1561         struct elf_prpsinfo *psinfo = NULL;     /* NT_PRPSINFO */
1562         LIST_HEAD(thread_list);
1563         struct list_head *t;
1564         elf_fpregset_t *fpu = NULL;
1565 #ifdef ELF_CORE_COPY_XFPREGS
1566         elf_fpxregset_t *xfpu = NULL;
1567 #endif
1568         int thread_status_size = 0;
1569         elf_addr_t *auxv;
1570         struct elf_phdr *phdr4note = NULL;
1571         struct elf_shdr *shdr4extnum = NULL;
1572         Elf_Half e_phnum;
1573         elf_addr_t e_shoff;
1574         struct core_thread *ct;
1575         struct elf_thread_status *tmp;
1576 
1577         /*
1578          * We no longer stop all VM operations.
1579          *
1580          * This is because those proceses that could possibly change map_count
1581          * or the mmap / vma pages are now blocked in do_exit on current
1582          * finishing this core dump.
1583          *
1584          * Only ptrace can touch these memory addresses, but it doesn't change
1585          * the map_count or the pages allocated. So no possibility of crashing
1586          * exists while dumping the mm->vm_next areas to the core file.
1587          */
1588 
1589         /* alloc memory for large data structures: too large to be on stack */
1590         elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1591         if (!elf)
1592                 goto cleanup;
1593         prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1594         if (!prstatus)
1595                 goto cleanup;
1596         psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1597         if (!psinfo)
1598                 goto cleanup;
1599         notes = kmalloc_array(NUM_NOTES, sizeof(struct memelfnote),
1600                               GFP_KERNEL);
1601         if (!notes)
1602                 goto cleanup;
1603         fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1604         if (!fpu)
1605                 goto cleanup;
1606 #ifdef ELF_CORE_COPY_XFPREGS
1607         xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1608         if (!xfpu)
1609                 goto cleanup;
1610 #endif
1611 
1612         for (ct = current->mm->core_state->dumper.next;
1613                                         ct; ct = ct->next) {
1614                 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
1615                 if (!tmp)
1616                         goto cleanup;
1617 
1618                 tmp->thread = ct->task;
1619                 list_add(&tmp->list, &thread_list);
1620         }
1621 
1622         list_for_each(t, &thread_list) {
1623                 struct elf_thread_status *tmp;
1624                 int sz;
1625 
1626                 tmp = list_entry(t, struct elf_thread_status, list);
1627                 sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
1628                 thread_status_size += sz;
1629         }
1630 
1631         /* now collect the dump for the current */
1632         fill_prstatus(prstatus, current, cprm->siginfo->si_signo);
1633         elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
1634 
1635         segs = current->mm->map_count;
1636         segs += elf_core_extra_phdrs();
1637 
1638         /* for notes section */
1639         segs++;
1640 
1641         /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
1642          * this, kernel supports extended numbering. Have a look at
1643          * include/linux/elf.h for further information. */
1644         e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1645 
1646         /* Set up header */
1647         fill_elf_fdpic_header(elf, e_phnum);
1648 
1649         has_dumped = 1;
1650         /*
1651          * Set up the notes in similar form to SVR4 core dumps made
1652          * with info from their /proc.
1653          */
1654 
1655         fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1656         fill_psinfo(psinfo, current->group_leader, current->mm);
1657         fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1658 
1659         numnote = 2;
1660 
1661         auxv = (elf_addr_t *) current->mm->saved_auxv;
1662 
1663         i = 0;
1664         do
1665                 i += 2;
1666         while (auxv[i - 2] != AT_NULL);
1667         fill_note(&notes[numnote++], "CORE", NT_AUXV,
1668                   i * sizeof(elf_addr_t), auxv);
1669 
1670         /* Try to dump the FPU. */
1671         if ((prstatus->pr_fpvalid =
1672              elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
1673                 fill_note(notes + numnote++,
1674                           "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1675 #ifdef ELF_CORE_COPY_XFPREGS
1676         if (elf_core_copy_task_xfpregs(current, xfpu))
1677                 fill_note(notes + numnote++,
1678                           "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
1679 #endif
1680 
1681         fs = get_fs();
1682         set_fs(KERNEL_DS);
1683 
1684         offset += sizeof(*elf);                         /* Elf header */
1685         offset += segs * sizeof(struct elf_phdr);       /* Program headers */
1686 
1687         /* Write notes phdr entry */
1688         {
1689                 int sz = 0;
1690 
1691                 for (i = 0; i < numnote; i++)
1692                         sz += notesize(notes + i);
1693 
1694                 sz += thread_status_size;
1695 
1696                 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1697                 if (!phdr4note)
1698                         goto end_coredump;
1699 
1700                 fill_elf_note_phdr(phdr4note, sz, offset);
1701                 offset += sz;
1702         }
1703 
1704         /* Page-align dumped data */
1705         dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1706 
1707         offset += elf_core_vma_data_size(cprm->mm_flags);
1708         offset += elf_core_extra_data_size();
1709         e_shoff = offset;
1710 
1711         if (e_phnum == PN_XNUM) {
1712                 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
1713                 if (!shdr4extnum)
1714                         goto end_coredump;
1715                 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
1716         }
1717 
1718         offset = dataoff;
1719 
1720         if (!dump_emit(cprm, elf, sizeof(*elf)))
1721                 goto end_coredump;
1722 
1723         if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
1724                 goto end_coredump;
1725 
1726         /* write program headers for segments dump */
1727         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1728                 struct elf_phdr phdr;
1729                 size_t sz;
1730 
1731                 sz = vma->vm_end - vma->vm_start;
1732 
1733                 phdr.p_type = PT_LOAD;
1734                 phdr.p_offset = offset;
1735                 phdr.p_vaddr = vma->vm_start;
1736                 phdr.p_paddr = 0;
1737                 phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
1738                 phdr.p_memsz = sz;
1739                 offset += phdr.p_filesz;
1740                 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1741                 if (vma->vm_flags & VM_WRITE)
1742                         phdr.p_flags |= PF_W;
1743                 if (vma->vm_flags & VM_EXEC)
1744                         phdr.p_flags |= PF_X;
1745                 phdr.p_align = ELF_EXEC_PAGESIZE;
1746 
1747                 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
1748                         goto end_coredump;
1749         }
1750 
1751         if (!elf_core_write_extra_phdrs(cprm, offset))
1752                 goto end_coredump;
1753 
1754         /* write out the notes section */
1755         for (i = 0; i < numnote; i++)
1756                 if (!writenote(notes + i, cprm))
1757                         goto end_coredump;
1758 
1759         /* write out the thread status notes section */
1760         list_for_each(t, &thread_list) {
1761                 struct elf_thread_status *tmp =
1762                                 list_entry(t, struct elf_thread_status, list);
1763 
1764                 for (i = 0; i < tmp->num_notes; i++)
1765                         if (!writenote(&tmp->notes[i], cprm))
1766                                 goto end_coredump;
1767         }
1768 
1769         if (!dump_skip(cprm, dataoff - cprm->pos))
1770                 goto end_coredump;
1771 
1772         if (!elf_fdpic_dump_segments(cprm))
1773                 goto end_coredump;
1774 
1775         if (!elf_core_write_extra_data(cprm))
1776                 goto end_coredump;
1777 
1778         if (e_phnum == PN_XNUM) {
1779                 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
1780                         goto end_coredump;
1781         }
1782 
1783         if (cprm->file->f_pos != offset) {
1784                 /* Sanity check */
1785                 printk(KERN_WARNING
1786                        "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1787                        cprm->file->f_pos, offset);
1788         }
1789 
1790 end_coredump:
1791         set_fs(fs);
1792 
1793 cleanup:
1794         while (!list_empty(&thread_list)) {
1795                 struct list_head *tmp = thread_list.next;
1796                 list_del(tmp);
1797                 kfree(list_entry(tmp, struct elf_thread_status, list));
1798         }
1799         kfree(phdr4note);
1800         kfree(elf);
1801         kfree(prstatus);
1802         kfree(psinfo);
1803         kfree(notes);
1804         kfree(fpu);
1805         kfree(shdr4extnum);
1806 #ifdef ELF_CORE_COPY_XFPREGS
1807         kfree(xfpu);
1808 #endif
1809         return has_dumped;
1810 #undef NUM_NOTES
1811 }
1812 
1813 #endif          /* CONFIG_ELF_CORE */
1814 

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