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1// SPDX-License-Identifier: GPL-2.0-or-later2/* binfmt_elf_fdpic.c: FDPIC ELF binary format3 *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.c7 */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#include <linux/regset.h>39 40#include <linux/uaccess.h>41#include <asm/param.h>42 43typedef char *elf_caddr_t;44 45#if 046#define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )47#else48#define kdebug(fmt, ...) do {} while(0)49#endif50 51#if 052#define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )53#else54#define kdcore(fmt, ...) do {} while(0)55#endif56 57MODULE_LICENSE("GPL");58 59static int load_elf_fdpic_binary(struct linux_binprm *);60static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);61static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,62 struct mm_struct *, const char *);63 64static 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_MMU69static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,70 struct file *,71 struct mm_struct *);72#endif73 74static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,75 struct file *, struct mm_struct *);76 77#ifdef CONFIG_ELF_CORE78static int elf_fdpic_core_dump(struct coredump_params *cprm);79#endif80 81static struct linux_binfmt elf_fdpic_format = {82 .module = THIS_MODULE,83 .load_binary = load_elf_fdpic_binary,84#ifdef CONFIG_ELF_CORE85 .core_dump = elf_fdpic_core_dump,86 .min_coredump = ELF_EXEC_PAGESIZE,87#endif88};89 90static int __init init_elf_fdpic_binfmt(void)91{92 register_binfmt(&elf_fdpic_format);93 return 0;94}95 96static void __exit exit_elf_fdpic_binfmt(void)97{98 unregister_binfmt(&elf_fdpic_format);99}100 101core_initcall(init_elf_fdpic_binfmt);102module_exit(exit_elf_fdpic_binfmt);103 104static 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_fdpic118#define elf_check_fdpic(x) 0119#endif120 121#ifndef elf_check_const_displacement122#define elf_check_const_displacement(x) 0123#endif124 125static 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 memory137 */138static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,139 struct file *file)140{141 struct elf_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 else169 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 memory181 */182static 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_INIT189 unsigned long dynaddr;190#endif191#ifndef CONFIG_MMU192 unsigned long stack_prot;193#endif194 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_MMU214 /* binfmt_elf handles non-fdpic elf except on nommu */215 goto error;216#else217 /* nommu can only load ET_DYN (PIE) ELF */218 if (exec_params.hdr.e_type != ET_DYN)219 goto error;220#endif221 }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 enforce271 * mm->dumpable = 0 regardless of the interpreter's272 * 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_MMU290 if (exec_params.load_addr == 0)291 exec_params.load_addr = phdr->p_vaddr;292#endif293 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 else321 executable_stack = EXSTACK_DEFAULT;322 323 if (stack_size == 0 && interp_params.flags & ELF_FDPIC_FLAG_PRESENT) {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 else330 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 = begin_new_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 SET_PERSONALITY(exec_params.hdr);349 if (elf_check_fdpic(&exec_params.hdr))350 current->personality |= PER_LINUX_FDPIC;351 if (elf_read_implies_exec(&exec_params.hdr, executable_stack))352 current->personality |= READ_IMPLIES_EXEC;353 354 setup_new_exec(bprm);355 356 set_binfmt(&elf_fdpic_format);357 358 current->mm->start_code = 0;359 current->mm->end_code = 0;360 current->mm->start_stack = 0;361 current->mm->start_data = 0;362 current->mm->end_data = 0;363 current->mm->context.exec_fdpic_loadmap = 0;364 current->mm->context.interp_fdpic_loadmap = 0;365 366#ifdef CONFIG_MMU367 elf_fdpic_arch_lay_out_mm(&exec_params,368 &interp_params,369 ¤t->mm->start_stack,370 ¤t->mm->start_brk);371 372 retval = setup_arg_pages(bprm, current->mm->start_stack,373 executable_stack);374 if (retval < 0)375 goto error;376#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES377 retval = arch_setup_additional_pages(bprm, !!interpreter_name);378 if (retval < 0)379 goto error;380#endif381#endif382 383 /* load the executable and interpreter into memory */384 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,385 "executable");386 if (retval < 0)387 goto error;388 389 if (interpreter_name) {390 retval = elf_fdpic_map_file(&interp_params, interpreter,391 current->mm, "interpreter");392 if (retval < 0) {393 printk(KERN_ERR "Unable to load interpreter\n");394 goto error;395 }396 397 fput(interpreter);398 interpreter = NULL;399 }400 401#ifdef CONFIG_MMU402 if (!current->mm->start_brk)403 current->mm->start_brk = current->mm->end_data;404 405 current->mm->brk = current->mm->start_brk =406 PAGE_ALIGN(current->mm->start_brk);407 408#else409 /* create a stack area and zero-size brk area */410 stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;411 if (stack_size < PAGE_SIZE * 2)412 stack_size = PAGE_SIZE * 2;413 414 stack_prot = PROT_READ | PROT_WRITE;415 if (executable_stack == EXSTACK_ENABLE_X ||416 (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))417 stack_prot |= PROT_EXEC;418 419 current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,420 MAP_PRIVATE | MAP_ANONYMOUS |421 MAP_UNINITIALIZED | MAP_GROWSDOWN,422 0);423 424 if (IS_ERR_VALUE(current->mm->start_brk)) {425 retval = current->mm->start_brk;426 current->mm->start_brk = 0;427 goto error;428 }429 430 current->mm->brk = current->mm->start_brk;431 current->mm->context.end_brk = current->mm->start_brk;432 current->mm->start_stack = current->mm->start_brk + stack_size;433#endif434 435 retval = create_elf_fdpic_tables(bprm, current->mm, &exec_params,436 &interp_params);437 if (retval < 0)438 goto error;439 440 kdebug("- start_code %lx", current->mm->start_code);441 kdebug("- end_code %lx", current->mm->end_code);442 kdebug("- start_data %lx", current->mm->start_data);443 kdebug("- end_data %lx", current->mm->end_data);444 kdebug("- start_brk %lx", current->mm->start_brk);445 kdebug("- brk %lx", current->mm->brk);446 kdebug("- start_stack %lx", current->mm->start_stack);447 448#ifdef ELF_FDPIC_PLAT_INIT449 /*450 * The ABI may specify that certain registers be set up in special451 * ways (on i386 %edx is the address of a DT_FINI function, for452 * example. This macro performs whatever initialization to453 * the regs structure is required.454 */455 dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;456 ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,457 dynaddr);458#endif459 460 finalize_exec(bprm);461 /* everything is now ready... get the userspace context ready to roll */462 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;463 start_thread(regs, entryaddr, current->mm->start_stack);464 465 retval = 0;466 467error:468 if (interpreter)469 fput(interpreter);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_PLATFORM481/*482 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.483 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value484 * will be copied to the user stack in the same manner as AT_PLATFORM.485 */486#define ELF_BASE_PLATFORM NULL487#endif488 489/*490 * present useful information to the program by shovelling it onto the new491 * process's stack492 */493static 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 unsigned long flags = 0;506 int ei_index;507 elf_addr_t *elf_info;508 509#ifdef CONFIG_MMU510 /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions511 * by the processes running on the same package. One thing we can do is512 * to shuffle the initial stack for them, so we give the architecture513 * an opportunity to do so here.514 */515 sp = arch_align_stack(bprm->p);516#else517 sp = mm->start_stack;518 519 /* stack the program arguments and environment */520 if (transfer_args_to_stack(bprm, &sp) < 0)521 return -EFAULT;522 sp &= ~15;523#endif524 525 /*526 * If this architecture has a platform capability string, copy it527 * to userspace. In some cases (Sparc), this info is impossible528 * for userspace to get any other way, in others (i386) it is529 * merely difficult.530 */531 k_platform = ELF_PLATFORM;532 u_platform = NULL;533 534 if (k_platform) {535 platform_len = strlen(k_platform) + 1;536 sp -= platform_len;537 u_platform = (char __user *) sp;538 if (copy_to_user(u_platform, k_platform, platform_len) != 0)539 return -EFAULT;540 }541 542 /*543 * If this architecture has a "base" platform capability544 * string, copy it to userspace.545 */546 k_base_platform = ELF_BASE_PLATFORM;547 u_base_platform = NULL;548 549 if (k_base_platform) {550 platform_len = strlen(k_base_platform) + 1;551 sp -= platform_len;552 u_base_platform = (char __user *) sp;553 if (copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)554 return -EFAULT;555 }556 557 sp &= ~7UL;558 559 /* stack the load map(s) */560 len = sizeof(struct elf_fdpic_loadmap);561 len += sizeof(struct elf_fdpic_loadseg) * exec_params->loadmap->nsegs;562 sp = (sp - len) & ~7UL;563 exec_params->map_addr = sp;564 565 if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)566 return -EFAULT;567 568 current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;569 570 if (interp_params->loadmap) {571 len = sizeof(struct elf_fdpic_loadmap);572 len += sizeof(struct elf_fdpic_loadseg) *573 interp_params->loadmap->nsegs;574 sp = (sp - len) & ~7UL;575 interp_params->map_addr = sp;576 577 if (copy_to_user((void __user *) sp, interp_params->loadmap,578 len) != 0)579 return -EFAULT;580 581 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;582 }583 584 /* force 16 byte _final_ alignment here for generality */585#define DLINFO_ITEMS 15586 587 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +588 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;589 590 if (bprm->have_execfd)591 nitems++;592#ifdef ELF_HWCAP2593 nitems++;594#endif595 596 csp = sp;597 sp -= nitems * 2 * sizeof(unsigned long);598 sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */599 sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */600 sp -= 1 * sizeof(unsigned long); /* argc */601 602 csp -= sp & 15UL;603 sp -= sp & 15UL;604 605 /* Create the ELF interpreter info */606 elf_info = (elf_addr_t *)mm->saved_auxv;607 /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */608#define NEW_AUX_ENT(id, val) \609 do { \610 *elf_info++ = id; \611 *elf_info++ = val; \612 } while (0)613 614#ifdef ARCH_DLINFO615 /*616 * ARCH_DLINFO must come first so PPC can do its special alignment of617 * AUXV.618 * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in619 * ARCH_DLINFO changes620 */621 ARCH_DLINFO;622#endif623 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);624#ifdef ELF_HWCAP2625 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);626#endif627 NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE);628 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);629 NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr);630 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));631 NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum);632 NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr);633 if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0)634 flags |= AT_FLAGS_PRESERVE_ARGV0;635 NEW_AUX_ENT(AT_FLAGS, flags);636 NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr);637 NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));638 NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));639 NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));640 NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));641 NEW_AUX_ENT(AT_SECURE, bprm->secureexec);642 NEW_AUX_ENT(AT_EXECFN, bprm->exec);643 if (k_platform)644 NEW_AUX_ENT(AT_PLATFORM,645 (elf_addr_t)(unsigned long)u_platform);646 if (k_base_platform)647 NEW_AUX_ENT(AT_BASE_PLATFORM,648 (elf_addr_t)(unsigned long)u_base_platform);649 if (bprm->have_execfd)650 NEW_AUX_ENT(AT_EXECFD, bprm->execfd);651#undef NEW_AUX_ENT652 /* AT_NULL is zero; clear the rest too */653 memset(elf_info, 0, (char *)mm->saved_auxv +654 sizeof(mm->saved_auxv) - (char *)elf_info);655 656 /* And advance past the AT_NULL entry. */657 elf_info += 2;658 659 ei_index = elf_info - (elf_addr_t *)mm->saved_auxv;660 csp -= ei_index * sizeof(elf_addr_t);661 662 /* Put the elf_info on the stack in the right place. */663 if (copy_to_user((void __user *)csp, mm->saved_auxv,664 ei_index * sizeof(elf_addr_t)))665 return -EFAULT;666 667 /* allocate room for argv[] and envv[] */668 csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);669 envp = (elf_caddr_t __user *) csp;670 csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);671 argv = (elf_caddr_t __user *) csp;672 673 /* stack argc */674 csp -= sizeof(unsigned long);675 if (put_user(bprm->argc, (unsigned long __user *) csp))676 return -EFAULT;677 678 BUG_ON(csp != sp);679 680 /* fill in the argv[] array */681#ifdef CONFIG_MMU682 current->mm->arg_start = bprm->p;683#else684 current->mm->arg_start = current->mm->start_stack -685 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);686#endif687 688 p = (char __user *) current->mm->arg_start;689 for (loop = bprm->argc; loop > 0; loop--) {690 if (put_user((elf_caddr_t) p, argv++))691 return -EFAULT;692 len = strnlen_user(p, MAX_ARG_STRLEN);693 if (!len || len > MAX_ARG_STRLEN)694 return -EINVAL;695 p += len;696 }697 if (put_user(NULL, argv))698 return -EFAULT;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 if (put_user((elf_caddr_t)(unsigned long) p, envp++))705 return -EFAULT;706 len = strnlen_user(p, MAX_ARG_STRLEN);707 if (!len || len > MAX_ARG_STRLEN)708 return -EINVAL;709 p += len;710 }711 if (put_user(NULL, envp))712 return -EFAULT;713 current->mm->env_end = (unsigned long) p;714 715 mm->start_stack = (unsigned long) sp;716 return 0;717}718 719/*****************************************************************************/720/*721 * load the appropriate binary image (executable or interpreter) into memory722 * - we assume no MMU is available723 * - if no other PIC bits are set in params->hdr->e_flags724 * - we assume that the LOADable segments in the binary are independently relocatable725 * - we assume R/O executable segments are shareable726 * - else727 * - we assume the loadable parts of the image to require fixed displacement728 * - the image is not shareable729 */730static int elf_fdpic_map_file(struct elf_fdpic_params *params,731 struct file *file,732 struct mm_struct *mm,733 const char *what)734{735 struct elf_fdpic_loadmap *loadmap;736#ifdef CONFIG_MMU737 struct elf_fdpic_loadseg *mseg;738 unsigned long load_addr;739#endif740 struct elf_fdpic_loadseg *seg;741 struct elf_phdr *phdr;742 unsigned nloads, tmp;743 unsigned long stop;744 int loop, ret;745 746 /* allocate a load map table */747 nloads = 0;748 for (loop = 0; loop < params->hdr.e_phnum; loop++)749 if (params->phdrs[loop].p_type == PT_LOAD)750 nloads++;751 752 if (nloads == 0)753 return -ELIBBAD;754 755 loadmap = kzalloc(struct_size(loadmap, segs, nloads), GFP_KERNEL);756 if (!loadmap)757 return -ENOMEM;758 759 params->loadmap = loadmap;760 761 loadmap->version = ELF_FDPIC_LOADMAP_VERSION;762 loadmap->nsegs = nloads;763 764 /* map the requested LOADs into the memory space */765 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {766 case ELF_FDPIC_FLAG_CONSTDISP:767 case ELF_FDPIC_FLAG_CONTIGUOUS:768#ifndef CONFIG_MMU769 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);770 if (ret < 0)771 return ret;772 break;773#endif774 default:775 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);776 if (ret < 0)777 return ret;778 break;779 }780 781 /* map the entry point */782 if (params->hdr.e_entry) {783 seg = loadmap->segs;784 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {785 if (params->hdr.e_entry >= seg->p_vaddr &&786 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {787 params->entry_addr =788 (params->hdr.e_entry - seg->p_vaddr) +789 seg->addr;790 break;791 }792 }793 }794 795 /* determine where the program header table has wound up if mapped */796 stop = params->hdr.e_phoff;797 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);798 phdr = params->phdrs;799 800 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {801 if (phdr->p_type != PT_LOAD)802 continue;803 804 if (phdr->p_offset > params->hdr.e_phoff ||805 phdr->p_offset + phdr->p_filesz < stop)806 continue;807 808 seg = loadmap->segs;809 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {810 if (phdr->p_vaddr >= seg->p_vaddr &&811 phdr->p_vaddr + phdr->p_filesz <=812 seg->p_vaddr + seg->p_memsz) {813 params->ph_addr =814 (phdr->p_vaddr - seg->p_vaddr) +815 seg->addr +816 params->hdr.e_phoff - phdr->p_offset;817 break;818 }819 }820 break;821 }822 823 /* determine where the dynamic section has wound up if there is one */824 phdr = params->phdrs;825 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {826 if (phdr->p_type != PT_DYNAMIC)827 continue;828 829 seg = loadmap->segs;830 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {831 if (phdr->p_vaddr >= seg->p_vaddr &&832 phdr->p_vaddr + phdr->p_memsz <=833 seg->p_vaddr + seg->p_memsz) {834 Elf_Dyn __user *dyn;835 Elf_Sword d_tag;836 837 params->dynamic_addr =838 (phdr->p_vaddr - seg->p_vaddr) +839 seg->addr;840 841 /* check the dynamic section contains at least842 * one item, and that the last item is a NULL843 * entry */844 if (phdr->p_memsz == 0 ||845 phdr->p_memsz % sizeof(Elf_Dyn) != 0)846 goto dynamic_error;847 848 tmp = phdr->p_memsz / sizeof(Elf_Dyn);849 dyn = (Elf_Dyn __user *)params->dynamic_addr;850 if (get_user(d_tag, &dyn[tmp - 1].d_tag) ||851 d_tag != 0)852 goto dynamic_error;853 break;854 }855 }856 break;857 }858 859 /* now elide adjacent segments in the load map on MMU linux860 * - on uClinux the holes between may actually be filled with system861 * stuff or stuff from other processes862 */863#ifdef CONFIG_MMU864 nloads = loadmap->nsegs;865 mseg = loadmap->segs;866 seg = mseg + 1;867 for (loop = 1; loop < nloads; loop++) {868 /* see if we have a candidate for merging */869 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {870 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);871 if (load_addr == (seg->addr & PAGE_MASK)) {872 mseg->p_memsz +=873 load_addr -874 (mseg->addr + mseg->p_memsz);875 mseg->p_memsz += seg->addr & ~PAGE_MASK;876 mseg->p_memsz += seg->p_memsz;877 loadmap->nsegs--;878 continue;879 }880 }881 882 mseg++;883 if (mseg != seg)884 *mseg = *seg;885 }886#endif887 888 kdebug("Mapped Object [%s]:", what);889 kdebug("- elfhdr : %lx", params->elfhdr_addr);890 kdebug("- entry : %lx", params->entry_addr);891 kdebug("- PHDR[] : %lx", params->ph_addr);892 kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);893 seg = loadmap->segs;894 for (loop = 0; loop < loadmap->nsegs; loop++, seg++)895 kdebug("- LOAD[%d] : %08llx-%08llx [va=%llx ms=%llx]",896 loop,897 (unsigned long long) seg->addr,898 (unsigned long long) seg->addr + seg->p_memsz - 1,899 (unsigned long long) seg->p_vaddr,900 (unsigned long long) seg->p_memsz);901 902 return 0;903 904dynamic_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 uClinux913 */914#ifndef CONFIG_MMU915static 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 elf_fdpic_loadseg *seg;921 struct elf_phdr *phdr;922 unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0;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 must929 * 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 maddr = vm_mmap(NULL, load_addr, top - base,943 PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, 0);944 if (IS_ERR_VALUE(maddr))945 return (int) maddr;946 947 if (load_addr != 0)948 load_addr += PAGE_ALIGN(top - base);949 950 /* and then load the file segments into it */951 phdr = params->phdrs;952 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {953 if (params->phdrs[loop].p_type != PT_LOAD)954 continue;955 956 seg->addr = maddr + (phdr->p_vaddr - base);957 seg->p_vaddr = phdr->p_vaddr;958 seg->p_memsz = phdr->p_memsz;959 960 ret = read_code(file, seg->addr, phdr->p_offset,961 phdr->p_filesz);962 if (ret < 0)963 return ret;964 965 /* map the ELF header address if in this segment */966 if (phdr->p_offset == 0)967 params->elfhdr_addr = seg->addr;968 969 /* clear any space allocated but not loaded */970 if (phdr->p_filesz < phdr->p_memsz) {971 if (clear_user((void *) (seg->addr + phdr->p_filesz),972 phdr->p_memsz - phdr->p_filesz))973 return -EFAULT;974 }975 976 if (mm) {977 if (phdr->p_flags & PF_X) {978 if (!mm->start_code) {979 mm->start_code = seg->addr;980 mm->end_code = seg->addr +981 phdr->p_memsz;982 }983 } else if (!mm->start_data) {984 mm->start_data = seg->addr;985 mm->end_data = seg->addr + phdr->p_memsz;986 }987 }988 989 seg++;990 }991 992 return 0;993}994#endif995 996/*****************************************************************************/997/*998 * map a binary by direct mmap() of the individual PT_LOAD segments999 */1000static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,1001 struct file *file,1002 struct mm_struct *mm)1003{1004 struct elf_fdpic_loadseg *seg;1005 struct elf_phdr *phdr;1006 unsigned long load_addr, delta_vaddr;1007 int loop, dvset;1008 1009 load_addr = params->load_addr;1010 delta_vaddr = 0;1011 dvset = 0;1012 1013 seg = params->loadmap->segs;1014 1015 /* deal with each load segment separately */1016 phdr = params->phdrs;1017 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {1018 unsigned long maddr, disp, excess, excess1;1019 int prot = 0, flags;1020 1021 if (phdr->p_type != PT_LOAD)1022 continue;1023 1024 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",1025 (unsigned long) phdr->p_vaddr,1026 (unsigned long) phdr->p_offset,1027 (unsigned long) phdr->p_filesz,1028 (unsigned long) phdr->p_memsz);1029 1030 /* determine the mapping parameters */1031 if (phdr->p_flags & PF_R) prot |= PROT_READ;1032 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;1033 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;1034 1035 flags = MAP_PRIVATE;1036 maddr = 0;1037 1038 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {1039 case ELF_FDPIC_FLAG_INDEPENDENT:1040 /* PT_LOADs are independently locatable */1041 break;1042 1043 case ELF_FDPIC_FLAG_HONOURVADDR:1044 /* the specified virtual address must be honoured */1045 maddr = phdr->p_vaddr;1046 flags |= MAP_FIXED;1047 break;1048 1049 case ELF_FDPIC_FLAG_CONSTDISP:1050 /* constant displacement1051 * - can be mapped anywhere, but must be mapped as a1052 * unit1053 */1054 if (!dvset) {1055 maddr = load_addr;1056 delta_vaddr = phdr->p_vaddr;1057 dvset = 1;1058 } else {1059 maddr = load_addr + phdr->p_vaddr - delta_vaddr;1060 flags |= MAP_FIXED;1061 }1062 break;1063 1064 case ELF_FDPIC_FLAG_CONTIGUOUS:1065 /* contiguity handled later */1066 break;1067 1068 default:1069 BUG();1070 }1071 1072 maddr &= PAGE_MASK;1073 1074 /* create the mapping */1075 disp = phdr->p_vaddr & ~PAGE_MASK;1076 maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,1077 phdr->p_offset - disp);1078 1079 kdebug("mmap[%d] <file> sz=%llx pr=%x fl=%x of=%llx --> %08lx",1080 loop, (unsigned long long) phdr->p_memsz + disp,1081 prot, flags, (unsigned long long) phdr->p_offset - disp,1082 maddr);1083 1084 if (IS_ERR_VALUE(maddr))1085 return (int) maddr;1086 1087 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==1088 ELF_FDPIC_FLAG_CONTIGUOUS)1089 load_addr += PAGE_ALIGN(phdr->p_memsz + disp);1090 1091 seg->addr = maddr + disp;1092 seg->p_vaddr = phdr->p_vaddr;1093 seg->p_memsz = phdr->p_memsz;1094 1095 /* map the ELF header address if in this segment */1096 if (phdr->p_offset == 0)1097 params->elfhdr_addr = seg->addr;1098 1099 /* clear the bit between beginning of mapping and beginning of1100 * PT_LOAD */1101 if (prot & PROT_WRITE && disp > 0) {1102 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);1103 if (clear_user((void __user *) maddr, disp))1104 return -EFAULT;1105 maddr += disp;1106 }1107 1108 /* clear any space allocated but not loaded1109 * - on uClinux we can just clear the lot1110 * - on MMU linux we'll get a SIGBUS beyond the last page1111 * extant in the file1112 */1113 excess = phdr->p_memsz - phdr->p_filesz;1114 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);1115 1116#ifdef CONFIG_MMU1117 if (excess > excess1) {1118 unsigned long xaddr = maddr + phdr->p_filesz + excess1;1119 unsigned long xmaddr;1120 1121 flags |= MAP_FIXED | MAP_ANONYMOUS;1122 xmaddr = vm_mmap(NULL, xaddr, excess - excess1,1123 prot, flags, 0);1124 1125 kdebug("mmap[%d] <anon>"1126 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",1127 loop, xaddr, excess - excess1, prot, flags,1128 xmaddr);1129 1130 if (xmaddr != xaddr)1131 return -ENOMEM;1132 }1133 1134 if (prot & PROT_WRITE && excess1 > 0) {1135 kdebug("clear[%d] ad=%lx sz=%lx",1136 loop, maddr + phdr->p_filesz, excess1);1137 if (clear_user((void __user *) maddr + phdr->p_filesz,1138 excess1))1139 return -EFAULT;1140 }1141 1142#else1143 if (excess > 0) {1144 kdebug("clear[%d] ad=%llx sz=%lx", loop,1145 (unsigned long long) maddr + phdr->p_filesz,1146 excess);1147 if (clear_user((void *) maddr + phdr->p_filesz, excess))1148 return -EFAULT;1149 }1150#endif1151 1152 if (mm) {1153 if (phdr->p_flags & PF_X) {1154 if (!mm->start_code) {1155 mm->start_code = maddr;1156 mm->end_code = maddr + phdr->p_memsz;1157 }1158 } else if (!mm->start_data) {1159 mm->start_data = maddr;1160 mm->end_data = maddr + phdr->p_memsz;1161 }1162 }1163 1164 seg++;1165 }1166 1167 return 0;1168}1169 1170/*****************************************************************************/1171/*1172 * ELF-FDPIC core dumper1173 *1174 * Modelled on fs/exec.c:aout_core_dump()1175 * Jeremy Fitzhardinge <jeremy@sw.oz.au>1176 *1177 * Modelled on fs/binfmt_elf.c core dumper1178 */1179#ifdef CONFIG_ELF_CORE1180 1181struct elf_prstatus_fdpic1182{1183 struct elf_prstatus_common common;1184 elf_gregset_t pr_reg; /* GP registers */1185 /* When using FDPIC, the loadmap addresses need to be communicated1186 * to GDB in order for GDB to do the necessary relocations. The1187 * fields (below) used to communicate this information are placed1188 * immediately after ``pr_reg'', so that the loadmap addresses may1189 * be viewed as part of the register set if so desired.1190 */1191 unsigned long pr_exec_fdpic_loadmap;1192 unsigned long pr_interp_fdpic_loadmap;1193 int pr_fpvalid; /* True if math co-processor being used. */1194};1195 1196/* An ELF note in memory */1197struct memelfnote1198{1199 const char *name;1200 int type;1201 unsigned int datasz;1202 void *data;1203};1204 1205static int notesize(struct memelfnote *en)1206{1207 int sz;1208 1209 sz = sizeof(struct elf_note);1210 sz += roundup(strlen(en->name) + 1, 4);1211 sz += roundup(en->datasz, 4);1212 1213 return sz;1214}1215 1216/* #define DEBUG */1217 1218static int writenote(struct memelfnote *men, struct coredump_params *cprm)1219{1220 struct elf_note en;1221 en.n_namesz = strlen(men->name) + 1;1222 en.n_descsz = men->datasz;1223 en.n_type = men->type;1224 1225 return dump_emit(cprm, &en, sizeof(en)) &&1226 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&1227 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);1228}1229 1230static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)1231{1232 memcpy(elf->e_ident, ELFMAG, SELFMAG);1233 elf->e_ident[EI_CLASS] = ELF_CLASS;1234 elf->e_ident[EI_DATA] = ELF_DATA;1235 elf->e_ident[EI_VERSION] = EV_CURRENT;1236 elf->e_ident[EI_OSABI] = ELF_OSABI;1237 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);1238 1239 elf->e_type = ET_CORE;1240 elf->e_machine = ELF_ARCH;1241 elf->e_version = EV_CURRENT;1242 elf->e_entry = 0;1243 elf->e_phoff = sizeof(struct elfhdr);1244 elf->e_shoff = 0;1245 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;1246 elf->e_ehsize = sizeof(struct elfhdr);1247 elf->e_phentsize = sizeof(struct elf_phdr);1248 elf->e_phnum = segs;1249 elf->e_shentsize = 0;1250 elf->e_shnum = 0;1251 elf->e_shstrndx = 0;1252 return;1253}1254 1255static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)1256{1257 phdr->p_type = PT_NOTE;1258 phdr->p_offset = offset;1259 phdr->p_vaddr = 0;1260 phdr->p_paddr = 0;1261 phdr->p_filesz = sz;1262 phdr->p_memsz = 0;1263 phdr->p_flags = 0;1264 phdr->p_align = 4;1265 return;1266}1267 1268static inline void fill_note(struct memelfnote *note, const char *name, int type,1269 unsigned int sz, void *data)1270{1271 note->name = name;1272 note->type = type;1273 note->datasz = sz;1274 note->data = data;1275 return;1276}1277 1278/*1279 * fill up all the fields in prstatus from the given task struct, except1280 * registers which need to be filled up separately.1281 */1282static void fill_prstatus(struct elf_prstatus_common *prstatus,1283 struct task_struct *p, long signr)1284{1285 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;1286 prstatus->pr_sigpend = p->pending.signal.sig[0];1287 prstatus->pr_sighold = p->blocked.sig[0];1288 rcu_read_lock();1289 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));1290 rcu_read_unlock();1291 prstatus->pr_pid = task_pid_vnr(p);1292 prstatus->pr_pgrp = task_pgrp_vnr(p);1293 prstatus->pr_sid = task_session_vnr(p);1294 if (thread_group_leader(p)) {1295 struct task_cputime cputime;1296 1297 /*1298 * This is the record for the group leader. It shows the1299 * group-wide total, not its individual thread total.1300 */1301 thread_group_cputime(p, &cputime);1302 prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime);1303 prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime);1304 } else {1305 u64 utime, stime;1306 1307 task_cputime(p, &utime, &stime);1308 prstatus->pr_utime = ns_to_kernel_old_timeval(utime);1309 prstatus->pr_stime = ns_to_kernel_old_timeval(stime);1310 }1311 prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime);1312 prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime);1313}1314 1315static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,1316 struct mm_struct *mm)1317{1318 const struct cred *cred;1319 unsigned int i, len;1320 unsigned int state;1321 1322 /* first copy the parameters from user space */1323 memset(psinfo, 0, sizeof(struct elf_prpsinfo));1324 1325 len = mm->arg_end - mm->arg_start;1326 if (len >= ELF_PRARGSZ)1327 len = ELF_PRARGSZ - 1;1328 if (copy_from_user(&psinfo->pr_psargs,1329 (const char __user *) mm->arg_start, len))1330 return -EFAULT;1331 for (i = 0; i < len; i++)1332 if (psinfo->pr_psargs[i] == 0)1333 psinfo->pr_psargs[i] = ' ';1334 psinfo->pr_psargs[len] = 0;1335 1336 rcu_read_lock();1337 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));1338 rcu_read_unlock();1339 psinfo->pr_pid = task_pid_vnr(p);1340 psinfo->pr_pgrp = task_pgrp_vnr(p);1341 psinfo->pr_sid = task_session_vnr(p);1342 1343 state = READ_ONCE(p->__state);1344 i = state ? ffz(~state) + 1 : 0;1345 psinfo->pr_state = i;1346 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];1347 psinfo->pr_zomb = psinfo->pr_sname == 'Z';1348 psinfo->pr_nice = task_nice(p);1349 psinfo->pr_flag = p->flags;1350 rcu_read_lock();1351 cred = __task_cred(p);1352 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));1353 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));1354 rcu_read_unlock();1355 get_task_comm(psinfo->pr_fname, p);1356 1357 return 0;1358}1359 1360/* Here is the structure in which status of each thread is captured. */1361struct elf_thread_status1362{1363 struct elf_thread_status *next;1364 struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */1365 elf_fpregset_t fpu; /* NT_PRFPREG */1366 struct memelfnote notes[2];1367 int num_notes;1368};1369 1370/*1371 * In order to add the specific thread information for the elf file format,1372 * we need to keep a linked list of every thread's pr_status and then create1373 * a single section for them in the final core file.1374 */1375static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz)1376{1377 const struct user_regset_view *view = task_user_regset_view(p);1378 struct elf_thread_status *t;1379 int i, ret;1380 1381 t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL);1382 if (!t)1383 return t;1384 1385 fill_prstatus(&t->prstatus.common, p, signr);1386 t->prstatus.pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;1387 t->prstatus.pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;1388 regset_get(p, &view->regsets[0],1389 sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg);1390 1391 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),1392 &t->prstatus);1393 t->num_notes++;1394 *sz += notesize(&t->notes[0]);1395 1396 for (i = 1; i < view->n; ++i) {1397 const struct user_regset *regset = &view->regsets[i];1398 if (regset->core_note_type != NT_PRFPREG)1399 continue;1400 if (regset->active && regset->active(p, regset) <= 0)1401 continue;1402 ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu);1403 if (ret >= 0)1404 t->prstatus.pr_fpvalid = 1;1405 break;1406 }1407 1408 if (t->prstatus.pr_fpvalid) {1409 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),1410 &t->fpu);1411 t->num_notes++;1412 *sz += notesize(&t->notes[1]);1413 }1414 return t;1415}1416 1417static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,1418 elf_addr_t e_shoff, int segs)1419{1420 elf->e_shoff = e_shoff;1421 elf->e_shentsize = sizeof(*shdr4extnum);1422 elf->e_shnum = 1;1423 elf->e_shstrndx = SHN_UNDEF;1424 1425 memset(shdr4extnum, 0, sizeof(*shdr4extnum));1426 1427 shdr4extnum->sh_type = SHT_NULL;1428 shdr4extnum->sh_size = elf->e_shnum;1429 shdr4extnum->sh_link = elf->e_shstrndx;1430 shdr4extnum->sh_info = segs;1431}1432 1433/*1434 * dump the segments for an MMU process1435 */1436static bool elf_fdpic_dump_segments(struct coredump_params *cprm,1437 struct core_vma_metadata *vma_meta,1438 int vma_count)1439{1440 int i;1441 1442 for (i = 0; i < vma_count; i++) {1443 struct core_vma_metadata *meta = vma_meta + i;1444 1445 if (!dump_user_range(cprm, meta->start, meta->dump_size))1446 return false;1447 }1448 return true;1449}1450 1451/*1452 * Actual dumper1453 *1454 * This is a two-pass process; first we find the offsets of the bits,1455 * and then they are actually written out. If we run out of core limit1456 * we just truncate.1457 */1458static int elf_fdpic_core_dump(struct coredump_params *cprm)1459{1460 int has_dumped = 0;1461 int segs;1462 int i;1463 struct elfhdr *elf = NULL;1464 loff_t offset = 0, dataoff;1465 struct memelfnote psinfo_note, auxv_note;1466 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */1467 struct elf_thread_status *thread_list = NULL;1468 int thread_status_size = 0;1469 elf_addr_t *auxv;1470 struct elf_phdr *phdr4note = NULL;1471 struct elf_shdr *shdr4extnum = NULL;1472 Elf_Half e_phnum;1473 elf_addr_t e_shoff;1474 struct core_thread *ct;1475 struct elf_thread_status *tmp;1476 1477 /* alloc memory for large data structures: too large to be on stack */1478 elf = kmalloc(sizeof(*elf), GFP_KERNEL);1479 if (!elf)1480 goto end_coredump;1481 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);1482 if (!psinfo)1483 goto end_coredump;1484 1485 for (ct = current->signal->core_state->dumper.next;1486 ct; ct = ct->next) {1487 tmp = elf_dump_thread_status(cprm->siginfo->si_signo,1488 ct->task, &thread_status_size);1489 if (!tmp)1490 goto end_coredump;1491 1492 tmp->next = thread_list;1493 thread_list = tmp;1494 }1495 1496 /* now collect the dump for the current */1497 tmp = elf_dump_thread_status(cprm->siginfo->si_signo,1498 current, &thread_status_size);1499 if (!tmp)1500 goto end_coredump;1501 tmp->next = thread_list;1502 thread_list = tmp;1503 1504 segs = cprm->vma_count + elf_core_extra_phdrs(cprm);1505 1506 /* for notes section */1507 segs++;1508 1509 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid1510 * this, kernel supports extended numbering. Have a look at1511 * include/linux/elf.h for further information. */1512 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;1513 1514 /* Set up header */1515 fill_elf_fdpic_header(elf, e_phnum);1516 1517 has_dumped = 1;1518 /*1519 * Set up the notes in similar form to SVR4 core dumps made1520 * with info from their /proc.1521 */1522 1523 fill_psinfo(psinfo, current->group_leader, current->mm);1524 fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);1525 thread_status_size += notesize(&psinfo_note);1526 1527 auxv = (elf_addr_t *) current->mm->saved_auxv;1528 i = 0;1529 do1530 i += 2;1531 while (auxv[i - 2] != AT_NULL);1532 fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);1533 thread_status_size += notesize(&auxv_note);1534 1535 offset = sizeof(*elf); /* ELF header */1536 offset += segs * sizeof(struct elf_phdr); /* Program headers */1537 1538 /* Write notes phdr entry */1539 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);1540 if (!phdr4note)1541 goto end_coredump;1542 1543 fill_elf_note_phdr(phdr4note, thread_status_size, offset);1544 offset += thread_status_size;1545 1546 /* Page-align dumped data */1547 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);1548 1549 offset += cprm->vma_data_size;1550 offset += elf_core_extra_data_size(cprm);1551 e_shoff = offset;1552 1553 if (e_phnum == PN_XNUM) {1554 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);1555 if (!shdr4extnum)1556 goto end_coredump;1557 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);1558 }1559 1560 offset = dataoff;1561 1562 if (!dump_emit(cprm, elf, sizeof(*elf)))1563 goto end_coredump;1564 1565 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))1566 goto end_coredump;1567 1568 /* write program headers for segments dump */1569 for (i = 0; i < cprm->vma_count; i++) {1570 struct core_vma_metadata *meta = cprm->vma_meta + i;1571 struct elf_phdr phdr;1572 size_t sz;1573 1574 sz = meta->end - meta->start;1575 1576 phdr.p_type = PT_LOAD;1577 phdr.p_offset = offset;1578 phdr.p_vaddr = meta->start;1579 phdr.p_paddr = 0;1580 phdr.p_filesz = meta->dump_size;1581 phdr.p_memsz = sz;1582 offset += phdr.p_filesz;1583 phdr.p_flags = 0;1584 if (meta->flags & VM_READ)1585 phdr.p_flags |= PF_R;1586 if (meta->flags & VM_WRITE)1587 phdr.p_flags |= PF_W;1588 if (meta->flags & VM_EXEC)1589 phdr.p_flags |= PF_X;1590 phdr.p_align = ELF_EXEC_PAGESIZE;1591 1592 if (!dump_emit(cprm, &phdr, sizeof(phdr)))1593 goto end_coredump;1594 }1595 1596 if (!elf_core_write_extra_phdrs(cprm, offset))1597 goto end_coredump;1598 1599 /* write out the notes section */1600 if (!writenote(thread_list->notes, cprm))1601 goto end_coredump;1602 if (!writenote(&psinfo_note, cprm))1603 goto end_coredump;1604 if (!writenote(&auxv_note, cprm))1605 goto end_coredump;1606 for (i = 1; i < thread_list->num_notes; i++)1607 if (!writenote(thread_list->notes + i, cprm))1608 goto end_coredump;1609 1610 /* write out the thread status notes section */1611 for (tmp = thread_list->next; tmp; tmp = tmp->next) {1612 for (i = 0; i < tmp->num_notes; i++)1613 if (!writenote(&tmp->notes[i], cprm))1614 goto end_coredump;1615 }1616 1617 dump_skip_to(cprm, dataoff);1618 1619 if (!elf_fdpic_dump_segments(cprm, cprm->vma_meta, cprm->vma_count))1620 goto end_coredump;1621 1622 if (!elf_core_write_extra_data(cprm))1623 goto end_coredump;1624 1625 if (e_phnum == PN_XNUM) {1626 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))1627 goto end_coredump;1628 }1629 1630 if (cprm->file->f_pos != offset) {1631 /* Sanity check */1632 printk(KERN_WARNING1633 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",1634 cprm->file->f_pos, offset);1635 }1636 1637end_coredump:1638 while (thread_list) {1639 tmp = thread_list;1640 thread_list = thread_list->next;1641 kfree(tmp);1642 }1643 kfree(phdr4note);1644 kfree(elf);1645 kfree(psinfo);1646 kfree(shdr4extnum);1647 return has_dumped;1648}1649 1650#endif /* CONFIG_ELF_CORE */1651