// SPDX-License-Identifier: GPL-2.0-or-later /* binfmt_elf_fdpic.c: FDPIC ELF binary format * * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * Derived from binfmt_elf.c */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef char *elf_caddr_t; #if 0 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) #else #define kdebug(fmt, ...) do {} while(0) #endif #if 0 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) #else #define kdcore(fmt, ...) do {} while(0) #endif MODULE_LICENSE("GPL"); static int load_elf_fdpic_binary(struct linux_binprm *); static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, struct mm_struct *, const char *); static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, struct elf_fdpic_params *, struct elf_fdpic_params *); #ifndef CONFIG_MMU static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, struct file *, struct mm_struct *); #endif static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, struct file *, struct mm_struct *); #ifdef CONFIG_ELF_CORE static int elf_fdpic_core_dump(struct coredump_params *cprm); #endif static struct linux_binfmt elf_fdpic_format = { .module = THIS_MODULE, .load_binary = load_elf_fdpic_binary, #ifdef CONFIG_ELF_CORE .core_dump = elf_fdpic_core_dump, .min_coredump = ELF_EXEC_PAGESIZE, #endif }; static int __init init_elf_fdpic_binfmt(void) { register_binfmt(&elf_fdpic_format); return 0; } static void __exit exit_elf_fdpic_binfmt(void) { unregister_binfmt(&elf_fdpic_format); } core_initcall(init_elf_fdpic_binfmt); module_exit(exit_elf_fdpic_binfmt); static int is_elf(struct elfhdr *hdr, struct file *file) { if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) return 0; if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) return 0; if (!elf_check_arch(hdr)) return 0; if (!file->f_op->mmap) return 0; return 1; } #ifndef elf_check_fdpic #define elf_check_fdpic(x) 0 #endif #ifndef elf_check_const_displacement #define elf_check_const_displacement(x) 0 #endif static int is_constdisp(struct elfhdr *hdr) { if (!elf_check_fdpic(hdr)) return 1; if (elf_check_const_displacement(hdr)) return 1; return 0; } /*****************************************************************************/ /* * read the program headers table into memory */ static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *file) { struct elf_phdr *phdr; unsigned long size; int retval, loop; loff_t pos = params->hdr.e_phoff; if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) return -ENOMEM; if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) return -ENOMEM; size = params->hdr.e_phnum * sizeof(struct elf_phdr); params->phdrs = kmalloc(size, GFP_KERNEL); if (!params->phdrs) return -ENOMEM; retval = kernel_read(file, params->phdrs, size, &pos); if (unlikely(retval != size)) return retval < 0 ? retval : -ENOEXEC; /* determine stack size for this binary */ phdr = params->phdrs; for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { if (phdr->p_type != PT_GNU_STACK) continue; if (phdr->p_flags & PF_X) params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; else params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; params->stack_size = phdr->p_memsz; break; } return 0; } /*****************************************************************************/ /* * load an fdpic binary into various bits of memory */ static int load_elf_fdpic_binary(struct linux_binprm *bprm) { struct elf_fdpic_params exec_params, interp_params; struct pt_regs *regs = current_pt_regs(); struct elf_phdr *phdr; unsigned long stack_size, entryaddr; #ifdef ELF_FDPIC_PLAT_INIT unsigned long dynaddr; #endif #ifndef CONFIG_MMU unsigned long stack_prot; #endif struct file *interpreter = NULL; /* to shut gcc up */ char *interpreter_name = NULL; int executable_stack; int retval, i; loff_t pos; kdebug("____ LOAD %d ____", current->pid); memset(&exec_params, 0, sizeof(exec_params)); memset(&interp_params, 0, sizeof(interp_params)); exec_params.hdr = *(struct elfhdr *) bprm->buf; exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; /* check that this is a binary we know how to deal with */ retval = -ENOEXEC; if (!is_elf(&exec_params.hdr, bprm->file)) goto error; if (!elf_check_fdpic(&exec_params.hdr)) { #ifdef CONFIG_MMU /* binfmt_elf handles non-fdpic elf except on nommu */ goto error; #else /* nommu can only load ET_DYN (PIE) ELF */ if (exec_params.hdr.e_type != ET_DYN) goto error; #endif } /* read the program header table */ retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); if (retval < 0) goto error; /* scan for a program header that specifies an interpreter */ phdr = exec_params.phdrs; for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { switch (phdr->p_type) { case PT_INTERP: retval = -ENOMEM; if (phdr->p_filesz > PATH_MAX) goto error; retval = -ENOENT; if (phdr->p_filesz < 2) goto error; /* read the name of the interpreter into memory */ interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); if (!interpreter_name) goto error; pos = phdr->p_offset; retval = kernel_read(bprm->file, interpreter_name, phdr->p_filesz, &pos); if (unlikely(retval != phdr->p_filesz)) { if (retval >= 0) retval = -ENOEXEC; goto error; } retval = -ENOENT; if (interpreter_name[phdr->p_filesz - 1] != '\0') goto error; kdebug("Using ELF interpreter %s", interpreter_name); /* replace the program with the interpreter */ interpreter = open_exec(interpreter_name); retval = PTR_ERR(interpreter); if (IS_ERR(interpreter)) { interpreter = NULL; goto error; } /* * If the binary is not readable then enforce * mm->dumpable = 0 regardless of the interpreter's * permissions. */ would_dump(bprm, interpreter); pos = 0; retval = kernel_read(interpreter, bprm->buf, BINPRM_BUF_SIZE, &pos); if (unlikely(retval != BINPRM_BUF_SIZE)) { if (retval >= 0) retval = -ENOEXEC; goto error; } interp_params.hdr = *((struct elfhdr *) bprm->buf); break; case PT_LOAD: #ifdef CONFIG_MMU if (exec_params.load_addr == 0) exec_params.load_addr = phdr->p_vaddr; #endif break; } } if (is_constdisp(&exec_params.hdr)) exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; /* perform insanity checks on the interpreter */ if (interpreter_name) { retval = -ELIBBAD; if (!is_elf(&interp_params.hdr, interpreter)) goto error; interp_params.flags = ELF_FDPIC_FLAG_PRESENT; /* read the interpreter's program header table */ retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); if (retval < 0) goto error; } stack_size = exec_params.stack_size; if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) executable_stack = EXSTACK_ENABLE_X; else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) executable_stack = EXSTACK_DISABLE_X; else executable_stack = EXSTACK_DEFAULT; if (stack_size == 0 && interp_params.flags & ELF_FDPIC_FLAG_PRESENT) { stack_size = interp_params.stack_size; if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) executable_stack = EXSTACK_ENABLE_X; else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) executable_stack = EXSTACK_DISABLE_X; else executable_stack = EXSTACK_DEFAULT; } retval = -ENOEXEC; if (stack_size == 0) stack_size = 131072UL; /* same as exec.c's default commit */ if (is_constdisp(&interp_params.hdr)) interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; /* flush all traces of the currently running executable */ retval = begin_new_exec(bprm); if (retval) goto error; /* there's now no turning back... the old userspace image is dead, * defunct, deceased, etc. */ SET_PERSONALITY(exec_params.hdr); if (elf_check_fdpic(&exec_params.hdr)) current->personality |= PER_LINUX_FDPIC; if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) current->personality |= READ_IMPLIES_EXEC; setup_new_exec(bprm); set_binfmt(&elf_fdpic_format); current->mm->start_code = 0; current->mm->end_code = 0; current->mm->start_stack = 0; current->mm->start_data = 0; current->mm->end_data = 0; current->mm->context.exec_fdpic_loadmap = 0; current->mm->context.interp_fdpic_loadmap = 0; #ifdef CONFIG_MMU elf_fdpic_arch_lay_out_mm(&exec_params, &interp_params, ¤t->mm->start_stack, ¤t->mm->start_brk); retval = setup_arg_pages(bprm, current->mm->start_stack, executable_stack); if (retval < 0) goto error; #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES retval = arch_setup_additional_pages(bprm, !!interpreter_name); if (retval < 0) goto error; #endif #endif /* load the executable and interpreter into memory */ retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, "executable"); if (retval < 0) goto error; if (interpreter_name) { retval = elf_fdpic_map_file(&interp_params, interpreter, current->mm, "interpreter"); if (retval < 0) { printk(KERN_ERR "Unable to load interpreter\n"); goto error; } fput(interpreter); interpreter = NULL; } #ifdef CONFIG_MMU if (!current->mm->start_brk) current->mm->start_brk = current->mm->end_data; current->mm->brk = current->mm->start_brk = PAGE_ALIGN(current->mm->start_brk); #else /* create a stack area and zero-size brk area */ stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; if (stack_size < PAGE_SIZE * 2) stack_size = PAGE_SIZE * 2; stack_prot = PROT_READ | PROT_WRITE; if (executable_stack == EXSTACK_ENABLE_X || (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) stack_prot |= PROT_EXEC; current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, MAP_PRIVATE | MAP_ANONYMOUS | MAP_UNINITIALIZED | MAP_GROWSDOWN, 0); if (IS_ERR_VALUE(current->mm->start_brk)) { retval = current->mm->start_brk; current->mm->start_brk = 0; goto error; } current->mm->brk = current->mm->start_brk; current->mm->context.end_brk = current->mm->start_brk; current->mm->start_stack = current->mm->start_brk + stack_size; #endif retval = create_elf_fdpic_tables(bprm, current->mm, &exec_params, &interp_params); if (retval < 0) goto error; kdebug("- start_code %lx", current->mm->start_code); kdebug("- end_code %lx", current->mm->end_code); kdebug("- start_data %lx", current->mm->start_data); kdebug("- end_data %lx", current->mm->end_data); kdebug("- start_brk %lx", current->mm->start_brk); kdebug("- brk %lx", current->mm->brk); kdebug("- start_stack %lx", current->mm->start_stack); #ifdef ELF_FDPIC_PLAT_INIT /* * The ABI may specify that certain registers be set up in special * ways (on i386 %edx is the address of a DT_FINI function, for * example. This macro performs whatever initialization to * the regs structure is required. */ dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, dynaddr); #endif finalize_exec(bprm); /* everything is now ready... get the userspace context ready to roll */ entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; start_thread(regs, entryaddr, current->mm->start_stack); retval = 0; error: if (interpreter) fput(interpreter); kfree(interpreter_name); kfree(exec_params.phdrs); kfree(exec_params.loadmap); kfree(interp_params.phdrs); kfree(interp_params.loadmap); return retval; } /*****************************************************************************/ #ifndef ELF_BASE_PLATFORM /* * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value * will be copied to the user stack in the same manner as AT_PLATFORM. */ #define ELF_BASE_PLATFORM NULL #endif /* * present useful information to the program by shovelling it onto the new * process's stack */ static int create_elf_fdpic_tables(struct linux_binprm *bprm, struct mm_struct *mm, struct elf_fdpic_params *exec_params, struct elf_fdpic_params *interp_params) { const struct cred *cred = current_cred(); unsigned long sp, csp, nitems; elf_caddr_t __user *argv, *envp; size_t platform_len = 0, len; char *k_platform, *k_base_platform; char __user *u_platform, *u_base_platform, *p; int loop; unsigned long flags = 0; int ei_index; elf_addr_t *elf_info; #ifdef CONFIG_MMU /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions * by the processes running on the same package. One thing we can do is * to shuffle the initial stack for them, so we give the architecture * an opportunity to do so here. */ sp = arch_align_stack(bprm->p); #else sp = mm->start_stack; /* stack the program arguments and environment */ if (transfer_args_to_stack(bprm, &sp) < 0) return -EFAULT; sp &= ~15; #endif /* * If this architecture has a platform capability string, copy it * to userspace. In some cases (Sparc), this info is impossible * for userspace to get any other way, in others (i386) it is * merely difficult. */ k_platform = ELF_PLATFORM; u_platform = NULL; if (k_platform) { platform_len = strlen(k_platform) + 1; sp -= platform_len; u_platform = (char __user *) sp; if (copy_to_user(u_platform, k_platform, platform_len) != 0) return -EFAULT; } /* * If this architecture has a "base" platform capability * string, copy it to userspace. */ k_base_platform = ELF_BASE_PLATFORM; u_base_platform = NULL; if (k_base_platform) { platform_len = strlen(k_base_platform) + 1; sp -= platform_len; u_base_platform = (char __user *) sp; if (copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) return -EFAULT; } sp &= ~7UL; /* stack the load map(s) */ len = sizeof(struct elf_fdpic_loadmap); len += sizeof(struct elf_fdpic_loadseg) * exec_params->loadmap->nsegs; sp = (sp - len) & ~7UL; exec_params->map_addr = sp; if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) return -EFAULT; current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; if (interp_params->loadmap) { len = sizeof(struct elf_fdpic_loadmap); len += sizeof(struct elf_fdpic_loadseg) * interp_params->loadmap->nsegs; sp = (sp - len) & ~7UL; interp_params->map_addr = sp; if (copy_to_user((void __user *) sp, interp_params->loadmap, len) != 0) return -EFAULT; current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; } /* force 16 byte _final_ alignment here for generality */ #define DLINFO_ITEMS 15 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; if (bprm->have_execfd) nitems++; #ifdef ELF_HWCAP2 nitems++; #endif csp = sp; sp -= nitems * 2 * sizeof(unsigned long); sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ sp -= 1 * sizeof(unsigned long); /* argc */ csp -= sp & 15UL; sp -= sp & 15UL; /* Create the ELF interpreter info */ elf_info = (elf_addr_t *)mm->saved_auxv; /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ #define NEW_AUX_ENT(id, val) \ do { \ *elf_info++ = id; \ *elf_info++ = val; \ } while (0) #ifdef ARCH_DLINFO /* * ARCH_DLINFO must come first so PPC can do its special alignment of * AUXV. * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in * ARCH_DLINFO changes */ ARCH_DLINFO; #endif NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); #ifdef ELF_HWCAP2 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); #endif #ifdef ELF_HWCAP3 NEW_AUX_ENT(AT_HWCAP3, ELF_HWCAP3); #endif #ifdef ELF_HWCAP4 NEW_AUX_ENT(AT_HWCAP4, ELF_HWCAP4); #endif NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0) flags |= AT_FLAGS_PRESERVE_ARGV0; NEW_AUX_ENT(AT_FLAGS, flags); NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); NEW_AUX_ENT(AT_SECURE, bprm->secureexec); NEW_AUX_ENT(AT_EXECFN, bprm->exec); if (k_platform) NEW_AUX_ENT(AT_PLATFORM, (elf_addr_t)(unsigned long)u_platform); if (k_base_platform) NEW_AUX_ENT(AT_BASE_PLATFORM, (elf_addr_t)(unsigned long)u_base_platform); if (bprm->have_execfd) NEW_AUX_ENT(AT_EXECFD, bprm->execfd); #undef NEW_AUX_ENT /* AT_NULL is zero; clear the rest too */ memset(elf_info, 0, (char *)mm->saved_auxv + sizeof(mm->saved_auxv) - (char *)elf_info); /* And advance past the AT_NULL entry. */ elf_info += 2; ei_index = elf_info - (elf_addr_t *)mm->saved_auxv; csp -= ei_index * sizeof(elf_addr_t); /* Put the elf_info on the stack in the right place. */ if (copy_to_user((void __user *)csp, mm->saved_auxv, ei_index * sizeof(elf_addr_t))) return -EFAULT; /* allocate room for argv[] and envv[] */ csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); envp = (elf_caddr_t __user *) csp; csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); argv = (elf_caddr_t __user *) csp; /* stack argc */ csp -= sizeof(unsigned long); if (put_user(bprm->argc, (unsigned long __user *) csp)) return -EFAULT; BUG_ON(csp != sp); /* fill in the argv[] array */ #ifdef CONFIG_MMU current->mm->arg_start = bprm->p; #else current->mm->arg_start = current->mm->start_stack - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); #endif p = (char __user *) current->mm->arg_start; for (loop = bprm->argc; loop > 0; loop--) { if (put_user((elf_caddr_t) p, argv++)) return -EFAULT; len = strnlen_user(p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } if (put_user(NULL, argv)) return -EFAULT; current->mm->arg_end = (unsigned long) p; /* fill in the envv[] array */ current->mm->env_start = (unsigned long) p; for (loop = bprm->envc; loop > 0; loop--) { if (put_user((elf_caddr_t)(unsigned long) p, envp++)) return -EFAULT; len = strnlen_user(p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } if (put_user(NULL, envp)) return -EFAULT; current->mm->env_end = (unsigned long) p; mm->start_stack = (unsigned long) sp; return 0; } /*****************************************************************************/ /* * load the appropriate binary image (executable or interpreter) into memory * - we assume no MMU is available * - if no other PIC bits are set in params->hdr->e_flags * - we assume that the LOADable segments in the binary are independently relocatable * - we assume R/O executable segments are shareable * - else * - we assume the loadable parts of the image to require fixed displacement * - the image is not shareable */ static int elf_fdpic_map_file(struct elf_fdpic_params *params, struct file *file, struct mm_struct *mm, const char *what) { struct elf_fdpic_loadmap *loadmap; #ifdef CONFIG_MMU struct elf_fdpic_loadseg *mseg; unsigned long load_addr; #endif struct elf_fdpic_loadseg *seg; struct elf_phdr *phdr; unsigned nloads, tmp; unsigned long stop; int loop, ret; /* allocate a load map table */ nloads = 0; for (loop = 0; loop < params->hdr.e_phnum; loop++) if (params->phdrs[loop].p_type == PT_LOAD) nloads++; if (nloads == 0) return -ELIBBAD; loadmap = kzalloc(struct_size(loadmap, segs, nloads), GFP_KERNEL); if (!loadmap) return -ENOMEM; params->loadmap = loadmap; loadmap->version = ELF_FDPIC_LOADMAP_VERSION; loadmap->nsegs = nloads; /* map the requested LOADs into the memory space */ switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { case ELF_FDPIC_FLAG_CONSTDISP: case ELF_FDPIC_FLAG_CONTIGUOUS: #ifndef CONFIG_MMU ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); if (ret < 0) return ret; break; #endif default: ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); if (ret < 0) return ret; break; } /* map the entry point */ if (params->hdr.e_entry) { seg = loadmap->segs; for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { if (params->hdr.e_entry >= seg->p_vaddr && params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { params->entry_addr = (params->hdr.e_entry - seg->p_vaddr) + seg->addr; break; } } } /* determine where the program header table has wound up if mapped */ stop = params->hdr.e_phoff; stop += params->hdr.e_phnum * sizeof (struct elf_phdr); phdr = params->phdrs; for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { if (phdr->p_type != PT_LOAD) continue; if (phdr->p_offset > params->hdr.e_phoff || phdr->p_offset + phdr->p_filesz < stop) continue; seg = loadmap->segs; for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { if (phdr->p_vaddr >= seg->p_vaddr && phdr->p_vaddr + phdr->p_filesz <= seg->p_vaddr + seg->p_memsz) { params->ph_addr = (phdr->p_vaddr - seg->p_vaddr) + seg->addr + params->hdr.e_phoff - phdr->p_offset; break; } } break; } /* determine where the dynamic section has wound up if there is one */ phdr = params->phdrs; for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { if (phdr->p_type != PT_DYNAMIC) continue; seg = loadmap->segs; for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { if (phdr->p_vaddr >= seg->p_vaddr && phdr->p_vaddr + phdr->p_memsz <= seg->p_vaddr + seg->p_memsz) { Elf_Dyn __user *dyn; Elf_Sword d_tag; params->dynamic_addr = (phdr->p_vaddr - seg->p_vaddr) + seg->addr; /* check the dynamic section contains at least * one item, and that the last item is a NULL * entry */ if (phdr->p_memsz == 0 || phdr->p_memsz % sizeof(Elf_Dyn) != 0) goto dynamic_error; tmp = phdr->p_memsz / sizeof(Elf_Dyn); dyn = (Elf_Dyn __user *)params->dynamic_addr; if (get_user(d_tag, &dyn[tmp - 1].d_tag) || d_tag != 0) goto dynamic_error; break; } } break; } /* now elide adjacent segments in the load map on MMU linux * - on uClinux the holes between may actually be filled with system * stuff or stuff from other processes */ #ifdef CONFIG_MMU nloads = loadmap->nsegs; mseg = loadmap->segs; seg = mseg + 1; for (loop = 1; loop < nloads; loop++) { /* see if we have a candidate for merging */ if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); if (load_addr == (seg->addr & PAGE_MASK)) { mseg->p_memsz += load_addr - (mseg->addr + mseg->p_memsz); mseg->p_memsz += seg->addr & ~PAGE_MASK; mseg->p_memsz += seg->p_memsz; loadmap->nsegs--; continue; } } mseg++; if (mseg != seg) *mseg = *seg; } #endif kdebug("Mapped Object [%s]:", what); kdebug("- elfhdr : %lx", params->elfhdr_addr); kdebug("- entry : %lx", params->entry_addr); kdebug("- PHDR[] : %lx", params->ph_addr); kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); seg = loadmap->segs; for (loop = 0; loop < loadmap->nsegs; loop++, seg++) kdebug("- LOAD[%d] : %08llx-%08llx [va=%llx ms=%llx]", loop, (unsigned long long) seg->addr, (unsigned long long) seg->addr + seg->p_memsz - 1, (unsigned long long) seg->p_vaddr, (unsigned long long) seg->p_memsz); return 0; dynamic_error: printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", what, file_inode(file)->i_ino); return -ELIBBAD; } /*****************************************************************************/ /* * map a file with constant displacement under uClinux */ #ifndef CONFIG_MMU static int elf_fdpic_map_file_constdisp_on_uclinux( struct elf_fdpic_params *params, struct file *file, struct mm_struct *mm) { struct elf_fdpic_loadseg *seg; struct elf_phdr *phdr; unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0; int loop, ret; load_addr = params->load_addr; seg = params->loadmap->segs; /* determine the bounds of the contiguous overall allocation we must * make */ phdr = params->phdrs; for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { if (params->phdrs[loop].p_type != PT_LOAD) continue; if (base > phdr->p_vaddr) base = phdr->p_vaddr; if (top < phdr->p_vaddr + phdr->p_memsz) top = phdr->p_vaddr + phdr->p_memsz; } /* allocate one big anon block for everything */ maddr = vm_mmap(NULL, load_addr, top - base, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, 0); if (IS_ERR_VALUE(maddr)) return (int) maddr; if (load_addr != 0) load_addr += PAGE_ALIGN(top - base); /* and then load the file segments into it */ phdr = params->phdrs; for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { if (params->phdrs[loop].p_type != PT_LOAD) continue; seg->addr = maddr + (phdr->p_vaddr - base); seg->p_vaddr = phdr->p_vaddr; seg->p_memsz = phdr->p_memsz; ret = read_code(file, seg->addr, phdr->p_offset, phdr->p_filesz); if (ret < 0) return ret; /* map the ELF header address if in this segment */ if (phdr->p_offset == 0) params->elfhdr_addr = seg->addr; /* clear any space allocated but not loaded */ if (phdr->p_filesz < phdr->p_memsz) { if (clear_user((void *) (seg->addr + phdr->p_filesz), phdr->p_memsz - phdr->p_filesz)) return -EFAULT; } if (mm) { if (phdr->p_flags & PF_X) { if (!mm->start_code) { mm->start_code = seg->addr; mm->end_code = seg->addr + phdr->p_memsz; } } else if (!mm->start_data) { mm->start_data = seg->addr; mm->end_data = seg->addr + phdr->p_memsz; } } seg++; } return 0; } #endif /*****************************************************************************/ /* * map a binary by direct mmap() of the individual PT_LOAD segments */ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, struct file *file, struct mm_struct *mm) { struct elf_fdpic_loadseg *seg; struct elf_phdr *phdr; unsigned long load_addr, delta_vaddr; int loop, dvset; load_addr = params->load_addr; delta_vaddr = 0; dvset = 0; seg = params->loadmap->segs; /* deal with each load segment separately */ phdr = params->phdrs; for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { unsigned long maddr, disp, excess, excess1; int prot = 0, flags; if (phdr->p_type != PT_LOAD) continue; kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", (unsigned long) phdr->p_vaddr, (unsigned long) phdr->p_offset, (unsigned long) phdr->p_filesz, (unsigned long) phdr->p_memsz); /* determine the mapping parameters */ if (phdr->p_flags & PF_R) prot |= PROT_READ; if (phdr->p_flags & PF_W) prot |= PROT_WRITE; if (phdr->p_flags & PF_X) prot |= PROT_EXEC; flags = MAP_PRIVATE; maddr = 0; switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { case ELF_FDPIC_FLAG_INDEPENDENT: /* PT_LOADs are independently locatable */ break; case ELF_FDPIC_FLAG_HONOURVADDR: /* the specified virtual address must be honoured */ maddr = phdr->p_vaddr; flags |= MAP_FIXED; break; case ELF_FDPIC_FLAG_CONSTDISP: /* constant displacement * - can be mapped anywhere, but must be mapped as a * unit */ if (!dvset) { maddr = load_addr; delta_vaddr = phdr->p_vaddr; dvset = 1; } else { maddr = load_addr + phdr->p_vaddr - delta_vaddr; flags |= MAP_FIXED; } break; case ELF_FDPIC_FLAG_CONTIGUOUS: /* contiguity handled later */ break; default: BUG(); } maddr &= PAGE_MASK; /* create the mapping */ disp = phdr->p_vaddr & ~PAGE_MASK; maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, phdr->p_offset - disp); kdebug("mmap[%d] sz=%llx pr=%x fl=%x of=%llx --> %08lx", loop, (unsigned long long) phdr->p_memsz + disp, prot, flags, (unsigned long long) phdr->p_offset - disp, maddr); if (IS_ERR_VALUE(maddr)) return (int) maddr; if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == ELF_FDPIC_FLAG_CONTIGUOUS) load_addr += PAGE_ALIGN(phdr->p_memsz + disp); seg->addr = maddr + disp; seg->p_vaddr = phdr->p_vaddr; seg->p_memsz = phdr->p_memsz; /* map the ELF header address if in this segment */ if (phdr->p_offset == 0) params->elfhdr_addr = seg->addr; /* clear the bit between beginning of mapping and beginning of * PT_LOAD */ if (prot & PROT_WRITE && disp > 0) { kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); if (clear_user((void __user *) maddr, disp)) return -EFAULT; maddr += disp; } /* clear any space allocated but not loaded * - on uClinux we can just clear the lot * - on MMU linux we'll get a SIGBUS beyond the last page * extant in the file */ excess = phdr->p_memsz - phdr->p_filesz; excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); #ifdef CONFIG_MMU if (excess > excess1) { unsigned long xaddr = maddr + phdr->p_filesz + excess1; unsigned long xmaddr; flags |= MAP_FIXED | MAP_ANONYMOUS; xmaddr = vm_mmap(NULL, xaddr, excess - excess1, prot, flags, 0); kdebug("mmap[%d] " " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", loop, xaddr, excess - excess1, prot, flags, xmaddr); if (xmaddr != xaddr) return -ENOMEM; } if (prot & PROT_WRITE && excess1 > 0) { kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr + phdr->p_filesz, excess1); if (clear_user((void __user *) maddr + phdr->p_filesz, excess1)) return -EFAULT; } #else if (excess > 0) { kdebug("clear[%d] ad=%llx sz=%lx", loop, (unsigned long long) maddr + phdr->p_filesz, excess); if (clear_user((void *) maddr + phdr->p_filesz, excess)) return -EFAULT; } #endif if (mm) { if (phdr->p_flags & PF_X) { if (!mm->start_code) { mm->start_code = maddr; mm->end_code = maddr + phdr->p_memsz; } } else if (!mm->start_data) { mm->start_data = maddr; mm->end_data = maddr + phdr->p_memsz; } } seg++; } return 0; } /*****************************************************************************/ /* * ELF-FDPIC core dumper * * Modelled on fs/exec.c:aout_core_dump() * Jeremy Fitzhardinge * * Modelled on fs/binfmt_elf.c core dumper */ #ifdef CONFIG_ELF_CORE struct elf_prstatus_fdpic { struct elf_prstatus_common common; elf_gregset_t pr_reg; /* GP registers */ /* When using FDPIC, the loadmap addresses need to be communicated * to GDB in order for GDB to do the necessary relocations. The * fields (below) used to communicate this information are placed * immediately after ``pr_reg'', so that the loadmap addresses may * be viewed as part of the register set if so desired. */ unsigned long pr_exec_fdpic_loadmap; unsigned long pr_interp_fdpic_loadmap; int pr_fpvalid; /* True if math co-processor being used. */ }; /* An ELF note in memory */ struct memelfnote { const char *name; int type; unsigned int datasz; void *data; }; static int notesize(struct memelfnote *en) { int sz; sz = sizeof(struct elf_note); sz += roundup(strlen(en->name) + 1, 4); sz += roundup(en->datasz, 4); return sz; } /* #define DEBUG */ static int writenote(struct memelfnote *men, struct coredump_params *cprm) { struct elf_note en; en.n_namesz = strlen(men->name) + 1; en.n_descsz = men->datasz; en.n_type = men->type; return dump_emit(cprm, &en, sizeof(en)) && dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); } static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) { memcpy(elf->e_ident, ELFMAG, SELFMAG); elf->e_ident[EI_CLASS] = ELF_CLASS; elf->e_ident[EI_DATA] = ELF_DATA; elf->e_ident[EI_VERSION] = EV_CURRENT; elf->e_ident[EI_OSABI] = ELF_OSABI; memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); elf->e_type = ET_CORE; elf->e_machine = ELF_ARCH; elf->e_version = EV_CURRENT; elf->e_entry = 0; elf->e_phoff = sizeof(struct elfhdr); elf->e_shoff = 0; elf->e_flags = ELF_FDPIC_CORE_EFLAGS; elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize = sizeof(struct elf_phdr); elf->e_phnum = segs; elf->e_shentsize = 0; elf->e_shnum = 0; elf->e_shstrndx = 0; return; } static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) { phdr->p_type = PT_NOTE; phdr->p_offset = offset; phdr->p_vaddr = 0; phdr->p_paddr = 0; phdr->p_filesz = sz; phdr->p_memsz = 0; phdr->p_flags = 0; phdr->p_align = 4; return; } static inline void fill_note(struct memelfnote *note, const char *name, int type, unsigned int sz, void *data) { note->name = name; note->type = type; note->datasz = sz; note->data = data; return; } /* * fill up all the fields in prstatus from the given task struct, except * registers which need to be filled up separately. */ static void fill_prstatus(struct elf_prstatus_common *prstatus, struct task_struct *p, long signr) { prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; prstatus->pr_sigpend = p->pending.signal.sig[0]; prstatus->pr_sighold = p->blocked.sig[0]; rcu_read_lock(); prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); prstatus->pr_pid = task_pid_vnr(p); prstatus->pr_pgrp = task_pgrp_vnr(p); prstatus->pr_sid = task_session_vnr(p); if (thread_group_leader(p)) { struct task_cputime cputime; /* * This is the record for the group leader. It shows the * group-wide total, not its individual thread total. */ thread_group_cputime(p, &cputime); prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime); prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime); } else { u64 utime, stime; task_cputime(p, &utime, &stime); prstatus->pr_utime = ns_to_kernel_old_timeval(utime); prstatus->pr_stime = ns_to_kernel_old_timeval(stime); } prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime); prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime); } static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, struct mm_struct *mm) { const struct cred *cred; unsigned int i, len; unsigned int state; /* first copy the parameters from user space */ memset(psinfo, 0, sizeof(struct elf_prpsinfo)); len = mm->arg_end - mm->arg_start; if (len >= ELF_PRARGSZ) len = ELF_PRARGSZ - 1; if (copy_from_user(&psinfo->pr_psargs, (const char __user *) mm->arg_start, len)) return -EFAULT; for (i = 0; i < len; i++) if (psinfo->pr_psargs[i] == 0) psinfo->pr_psargs[i] = ' '; psinfo->pr_psargs[len] = 0; rcu_read_lock(); psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); psinfo->pr_pid = task_pid_vnr(p); psinfo->pr_pgrp = task_pgrp_vnr(p); psinfo->pr_sid = task_session_vnr(p); state = READ_ONCE(p->__state); i = state ? ffz(~state) + 1 : 0; psinfo->pr_state = i; psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; psinfo->pr_zomb = psinfo->pr_sname == 'Z'; psinfo->pr_nice = task_nice(p); psinfo->pr_flag = p->flags; rcu_read_lock(); cred = __task_cred(p); SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); rcu_read_unlock(); get_task_comm(psinfo->pr_fname, p); return 0; } /* Here is the structure in which status of each thread is captured. */ struct elf_thread_status { struct elf_thread_status *next; struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */ elf_fpregset_t fpu; /* NT_PRFPREG */ struct memelfnote notes[2]; int num_notes; }; /* * In order to add the specific thread information for the elf file format, * we need to keep a linked list of every thread's pr_status and then create * a single section for them in the final core file. */ static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz) { const struct user_regset_view *view = task_user_regset_view(p); struct elf_thread_status *t; int i, ret; t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL); if (!t) return t; fill_prstatus(&t->prstatus.common, p, signr); t->prstatus.pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; t->prstatus.pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; regset_get(p, &view->regsets[0], sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg); fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &t->prstatus); t->num_notes++; *sz += notesize(&t->notes[0]); for (i = 1; i < view->n; ++i) { const struct user_regset *regset = &view->regsets[i]; if (regset->core_note_type != NT_PRFPREG) continue; if (regset->active && regset->active(p, regset) <= 0) continue; ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu); if (ret >= 0) t->prstatus.pr_fpvalid = 1; break; } if (t->prstatus.pr_fpvalid) { fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &t->fpu); t->num_notes++; *sz += notesize(&t->notes[1]); } return t; } static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, elf_addr_t e_shoff, int segs) { elf->e_shoff = e_shoff; elf->e_shentsize = sizeof(*shdr4extnum); elf->e_shnum = 1; elf->e_shstrndx = SHN_UNDEF; memset(shdr4extnum, 0, sizeof(*shdr4extnum)); shdr4extnum->sh_type = SHT_NULL; shdr4extnum->sh_size = elf->e_shnum; shdr4extnum->sh_link = elf->e_shstrndx; shdr4extnum->sh_info = segs; } /* * dump the segments for an MMU process */ static bool elf_fdpic_dump_segments(struct coredump_params *cprm, struct core_vma_metadata *vma_meta, int vma_count) { int i; for (i = 0; i < vma_count; i++) { struct core_vma_metadata *meta = vma_meta + i; if (!dump_user_range(cprm, meta->start, meta->dump_size)) return false; } return true; } /* * Actual dumper * * This is a two-pass process; first we find the offsets of the bits, * and then they are actually written out. If we run out of core limit * we just truncate. */ static int elf_fdpic_core_dump(struct coredump_params *cprm) { int has_dumped = 0; int segs; int i; struct elfhdr *elf = NULL; loff_t offset = 0, dataoff; struct memelfnote psinfo_note, auxv_note; struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ struct elf_thread_status *thread_list = NULL; int thread_status_size = 0; elf_addr_t *auxv; struct elf_phdr *phdr4note = NULL; struct elf_shdr *shdr4extnum = NULL; Elf_Half e_phnum; elf_addr_t e_shoff; struct core_thread *ct; struct elf_thread_status *tmp; /* alloc memory for large data structures: too large to be on stack */ elf = kmalloc(sizeof(*elf), GFP_KERNEL); if (!elf) goto end_coredump; psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); if (!psinfo) goto end_coredump; for (ct = current->signal->core_state->dumper.next; ct; ct = ct->next) { tmp = elf_dump_thread_status(cprm->siginfo->si_signo, ct->task, &thread_status_size); if (!tmp) goto end_coredump; tmp->next = thread_list; thread_list = tmp; } /* now collect the dump for the current */ tmp = elf_dump_thread_status(cprm->siginfo->si_signo, current, &thread_status_size); if (!tmp) goto end_coredump; tmp->next = thread_list; thread_list = tmp; segs = cprm->vma_count + elf_core_extra_phdrs(cprm); /* for notes section */ segs++; /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid * this, kernel supports extended numbering. Have a look at * include/linux/elf.h for further information. */ e_phnum = segs > PN_XNUM ? PN_XNUM : segs; /* Set up header */ fill_elf_fdpic_header(elf, e_phnum); has_dumped = 1; /* * Set up the notes in similar form to SVR4 core dumps made * with info from their /proc. */ fill_psinfo(psinfo, current->group_leader, current->mm); fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); thread_status_size += notesize(&psinfo_note); auxv = (elf_addr_t *) current->mm->saved_auxv; i = 0; do i += 2; while (auxv[i - 2] != AT_NULL); fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); thread_status_size += notesize(&auxv_note); offset = sizeof(*elf); /* ELF header */ offset += segs * sizeof(struct elf_phdr); /* Program headers */ /* Write notes phdr entry */ phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); if (!phdr4note) goto end_coredump; fill_elf_note_phdr(phdr4note, thread_status_size, offset); offset += thread_status_size; /* Page-align dumped data */ dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); offset += cprm->vma_data_size; offset += elf_core_extra_data_size(cprm); e_shoff = offset; if (e_phnum == PN_XNUM) { shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); if (!shdr4extnum) goto end_coredump; fill_extnum_info(elf, shdr4extnum, e_shoff, segs); } offset = dataoff; if (!dump_emit(cprm, elf, sizeof(*elf))) goto end_coredump; if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) goto end_coredump; /* write program headers for segments dump */ for (i = 0; i < cprm->vma_count; i++) { struct core_vma_metadata *meta = cprm->vma_meta + i; struct elf_phdr phdr; size_t sz; sz = meta->end - meta->start; phdr.p_type = PT_LOAD; phdr.p_offset = offset; phdr.p_vaddr = meta->start; phdr.p_paddr = 0; phdr.p_filesz = meta->dump_size; phdr.p_memsz = sz; offset += phdr.p_filesz; phdr.p_flags = 0; if (meta->flags & VM_READ) phdr.p_flags |= PF_R; if (meta->flags & VM_WRITE) phdr.p_flags |= PF_W; if (meta->flags & VM_EXEC) phdr.p_flags |= PF_X; phdr.p_align = ELF_EXEC_PAGESIZE; if (!dump_emit(cprm, &phdr, sizeof(phdr))) goto end_coredump; } if (!elf_core_write_extra_phdrs(cprm, offset)) goto end_coredump; /* write out the notes section */ if (!writenote(thread_list->notes, cprm)) goto end_coredump; if (!writenote(&psinfo_note, cprm)) goto end_coredump; if (!writenote(&auxv_note, cprm)) goto end_coredump; for (i = 1; i < thread_list->num_notes; i++) if (!writenote(thread_list->notes + i, cprm)) goto end_coredump; /* write out the thread status notes section */ for (tmp = thread_list->next; tmp; tmp = tmp->next) { for (i = 0; i < tmp->num_notes; i++) if (!writenote(&tmp->notes[i], cprm)) goto end_coredump; } dump_skip_to(cprm, dataoff); if (!elf_fdpic_dump_segments(cprm, cprm->vma_meta, cprm->vma_count)) goto end_coredump; if (!elf_core_write_extra_data(cprm)) goto end_coredump; if (e_phnum == PN_XNUM) { if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) goto end_coredump; } if (cprm->file->f_pos != offset) { /* Sanity check */ printk(KERN_WARNING "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", cprm->file->f_pos, offset); } end_coredump: while (thread_list) { tmp = thread_list; thread_list = thread_list->next; kfree(tmp); } kfree(phdr4note); kfree(elf); kfree(psinfo); kfree(shdr4extnum); return has_dumped; } #endif /* CONFIG_ELF_CORE */