Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1677 insertions, 0 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
new file mode 100644
index 00000000000..76ec9d8939f
--- /dev/null
+++ b/fs/binfmt_elf.c
@@ -0,0 +1,1677 @@
+/*
+ * linux/fs/binfmt_elf.c
+ *
+ * These are the functions used to load ELF format executables as used
+ * on SVr4 machines.  Information on the format may be found in the book
+ * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support
+ * Tools".
+ *
+ * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/a.out.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/binfmts.h>
+#include <linux/string.h>
+#include <linux/file.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/shm.h>
+#include <linux/personality.h>
+#include <linux/elfcore.h>
+#include <linux/init.h>
+#include <linux/highuid.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/compiler.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <linux/random.h>
+
+#include <asm/uaccess.h>
+#include <asm/param.h>
+#include <asm/page.h>
+
+#include <linux/elf.h>
+
+static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs);
+static int load_elf_library(struct file*);
+static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int);
+extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
+
+#ifndef elf_addr_t
+#define elf_addr_t unsigned long
+#endif
+
+/*
+ * If we don't support core dumping, then supply a NULL so we
+ * don't even try.
+ */
+#ifdef USE_ELF_CORE_DUMP
+static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file);
+#else
+#define elf_core_dump	NULL
+#endif
+
+#if ELF_EXEC_PAGESIZE > PAGE_SIZE
+# define ELF_MIN_ALIGN	ELF_EXEC_PAGESIZE
+#else
+# define ELF_MIN_ALIGN	PAGE_SIZE
+#endif
+
+#ifndef ELF_CORE_EFLAGS
+#define ELF_CORE_EFLAGS	0
+#endif
+
+#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
+#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
+#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
+
+static struct linux_binfmt elf_format = {
+		.module		= THIS_MODULE,
+		.load_binary	= load_elf_binary,
+		.load_shlib	= load_elf_library,
+		.core_dump	= elf_core_dump,
+		.min_coredump	= ELF_EXEC_PAGESIZE
+};
+
+#define BAD_ADDR(x)	((unsigned long)(x) > TASK_SIZE)
+
+static int set_brk(unsigned long start, unsigned long end)
+{
+	start = ELF_PAGEALIGN(start);
+	end = ELF_PAGEALIGN(end);
+	if (end > start) {
+		unsigned long addr;
+		down_write(&current->mm->mmap_sem);
+		addr = do_brk(start, end - start);
+		up_write(&current->mm->mmap_sem);
+		if (BAD_ADDR(addr))
+			return addr;
+	}
+	current->mm->start_brk = current->mm->brk = end;
+	return 0;
+}
+
+
+/* We need to explicitly zero any fractional pages
+   after the data section (i.e. bss).  This would
+   contain the junk from the file that should not
+   be in memory */
+
+
+static int padzero(unsigned long elf_bss)
+{
+	unsigned long nbyte;
+
+	nbyte = ELF_PAGEOFFSET(elf_bss);
+	if (nbyte) {
+		nbyte = ELF_MIN_ALIGN - nbyte;
+		if (clear_user((void __user *) elf_bss, nbyte))
+			return -EFAULT;
+	}
+	return 0;
+}
+
+/* Let's use some macros to make this stack manipulation a litle clearer */
+#ifdef CONFIG_STACK_GROWSUP
+#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
+#define STACK_ROUND(sp, items) \
+	((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
+#define STACK_ALLOC(sp, len) ({ elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; old_sp; })
+#else
+#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
+#define STACK_ROUND(sp, items) \
+	(((unsigned long) (sp - items)) &~ 15UL)
+#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
+#endif
+
+static int
+create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
+		int interp_aout, unsigned long load_addr,
+		unsigned long interp_load_addr)
+{
+	unsigned long p = bprm->p;
+	int argc = bprm->argc;
+	int envc = bprm->envc;
+	elf_addr_t __user *argv;
+	elf_addr_t __user *envp;
+	elf_addr_t __user *sp;
+	elf_addr_t __user *u_platform;
+	const char *k_platform = ELF_PLATFORM;
+	int items;
+	elf_addr_t *elf_info;
+	int ei_index = 0;
+	struct task_struct *tsk = current;
+
+	/*
+	 * 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.
+	 */
+
+	u_platform = NULL;
+	if (k_platform) {
+		size_t len = strlen(k_platform) + 1;
+
+		/*
+		 * 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.
+		 */
+	 
+		p = arch_align_stack(p);
+
+		u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
+		if (__copy_to_user(u_platform, k_platform, len))
+			return -EFAULT;
+	}
+
+	/* Create the ELF interpreter info */
+	elf_info = (elf_addr_t *) current->mm->saved_auxv;
+#define NEW_AUX_ENT(id, val) \
+	do { elf_info[ei_index++] = id; elf_info[ei_index++] = val; } while (0)
+
+#ifdef ARCH_DLINFO
+	/* 
+	 * ARCH_DLINFO must come first so PPC can do its special alignment of
+	 * AUXV.
+	 */
+	ARCH_DLINFO;
+#endif
+	NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
+	NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
+	NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
+	NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
+	NEW_AUX_ENT(AT_PHENT, sizeof (struct elf_phdr));
+	NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
+	NEW_AUX_ENT(AT_BASE, interp_load_addr);
+	NEW_AUX_ENT(AT_FLAGS, 0);
+	NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
+	NEW_AUX_ENT(AT_UID, (elf_addr_t) tsk->uid);
+	NEW_AUX_ENT(AT_EUID, (elf_addr_t) tsk->euid);
+	NEW_AUX_ENT(AT_GID, (elf_addr_t) tsk->gid);
+	NEW_AUX_ENT(AT_EGID, (elf_addr_t) tsk->egid);
+ 	NEW_AUX_ENT(AT_SECURE, (elf_addr_t) security_bprm_secureexec(bprm));
+	if (k_platform) {
+		NEW_AUX_ENT(AT_PLATFORM, (elf_addr_t)(unsigned long)u_platform);
+	}
+	if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
+		NEW_AUX_ENT(AT_EXECFD, (elf_addr_t) bprm->interp_data);
+	}
+#undef NEW_AUX_ENT
+	/* AT_NULL is zero; clear the rest too */
+	memset(&elf_info[ei_index], 0,
+	       sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
+
+	/* And advance past the AT_NULL entry.  */
+	ei_index += 2;
+
+	sp = STACK_ADD(p, ei_index);
+
+	items = (argc + 1) + (envc + 1);
+	if (interp_aout) {
+		items += 3; /* a.out interpreters require argv & envp too */
+	} else {
+		items += 1; /* ELF interpreters only put argc on the stack */
+	}
+	bprm->p = STACK_ROUND(sp, items);
+
+	/* Point sp at the lowest address on the stack */
+#ifdef CONFIG_STACK_GROWSUP
+	sp = (elf_addr_t __user *)bprm->p - items - ei_index;
+	bprm->exec = (unsigned long) sp; /* XXX: PARISC HACK */
+#else
+	sp = (elf_addr_t __user *)bprm->p;
+#endif
+
+	/* Now, let's put argc (and argv, envp if appropriate) on the stack */
+	if (__put_user(argc, sp++))
+		return -EFAULT;
+	if (interp_aout) {
+		argv = sp + 2;
+		envp = argv + argc + 1;
+		__put_user((elf_addr_t)(unsigned long)argv, sp++);
+		__put_user((elf_addr_t)(unsigned long)envp, sp++);
+	} else {
+		argv = sp;
+		envp = argv + argc + 1;
+	}
+
+	/* Populate argv and envp */
+	p = current->mm->arg_start;
+	while (argc-- > 0) {
+		size_t len;
+		__put_user((elf_addr_t)p, argv++);
+		len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
+		if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
+			return 0;
+		p += len;
+	}
+	if (__put_user(0, argv))
+		return -EFAULT;
+	current->mm->arg_end = current->mm->env_start = p;
+	while (envc-- > 0) {
+		size_t len;
+		__put_user((elf_addr_t)p, envp++);
+		len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
+		if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
+			return 0;
+		p += len;
+	}
+	if (__put_user(0, envp))
+		return -EFAULT;
+	current->mm->env_end = p;
+
+	/* Put the elf_info on the stack in the right place.  */
+	sp = (elf_addr_t __user *)envp + 1;
+	if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
+		return -EFAULT;
+	return 0;
+}
+
+#ifndef elf_map
+
+static unsigned long elf_map(struct file *filep, unsigned long addr,
+			struct elf_phdr *eppnt, int prot, int type)
+{
+	unsigned long map_addr;
+
+	down_write(&current->mm->mmap_sem);
+	map_addr = do_mmap(filep, ELF_PAGESTART(addr),
+			   eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot, type,
+			   eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
+	up_write(&current->mm->mmap_sem);
+	return(map_addr);
+}
+
+#endif /* !elf_map */
+
+/* This is much more generalized than the library routine read function,
+   so we keep this separate.  Technically the library read function
+   is only provided so that we can read a.out libraries that have
+   an ELF header */
+
+static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
+				     struct file * interpreter,
+				     unsigned long *interp_load_addr)
+{
+	struct elf_phdr *elf_phdata;
+	struct elf_phdr *eppnt;
+	unsigned long load_addr = 0;
+	int load_addr_set = 0;
+	unsigned long last_bss = 0, elf_bss = 0;
+	unsigned long error = ~0UL;
+	int retval, i, size;
+
+	/* First of all, some simple consistency checks */
+	if (interp_elf_ex->e_type != ET_EXEC &&
+	    interp_elf_ex->e_type != ET_DYN)
+		goto out;
+	if (!elf_check_arch(interp_elf_ex))
+		goto out;
+	if (!interpreter->f_op || !interpreter->f_op->mmap)
+		goto out;
+
+	/*
+	 * If the size of this structure has changed, then punt, since
+	 * we will be doing the wrong thing.
+	 */
+	if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
+		goto out;
+	if (interp_elf_ex->e_phnum < 1 ||
+		interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
+		goto out;
+
+	/* Now read in all of the header information */
+
+	size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
+	if (size > ELF_MIN_ALIGN)
+		goto out;
+	elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
+	if (!elf_phdata)
+		goto out;
+
+	retval = kernel_read(interpreter,interp_elf_ex->e_phoff,(char *)elf_phdata,size);
+	error = -EIO;
+	if (retval != size) {
+		if (retval < 0)
+			error = retval;	
+		goto out_close;
+	}
+
+	eppnt = elf_phdata;
+	for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
+	  if (eppnt->p_type == PT_LOAD) {
+	    int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
+	    int elf_prot = 0;
+	    unsigned long vaddr = 0;
+	    unsigned long k, map_addr;
+
+	    if (eppnt->p_flags & PF_R) elf_prot =  PROT_READ;
+	    if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
+	    if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
+	    vaddr = eppnt->p_vaddr;
+	    if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
+	    	elf_type |= MAP_FIXED;
+
+	    map_addr = elf_map(interpreter, load_addr + vaddr, eppnt, elf_prot, elf_type);
+	    error = map_addr;
+	    if (BAD_ADDR(map_addr))
+	    	goto out_close;
+
+	    if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
+		load_addr = map_addr - ELF_PAGESTART(vaddr);
+		load_addr_set = 1;
+	    }
+
+	    /*
+	     * Check to see if the section's size will overflow the
+	     * allowed task size. Note that p_filesz must always be
+	     * <= p_memsize so it is only necessary to check p_memsz.
+	     */
+	    k = load_addr + eppnt->p_vaddr;
+	    if (k > TASK_SIZE || eppnt->p_filesz > eppnt->p_memsz ||
+		eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) {
+	        error = -ENOMEM;
+		goto out_close;
+	    }
+
+	    /*
+	     * Find the end of the file mapping for this phdr, and keep
+	     * track of the largest address we see for this.
+	     */
+	    k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
+	    if (k > elf_bss)
+		elf_bss = k;
+
+	    /*
+	     * Do the same thing for the memory mapping - between
+	     * elf_bss and last_bss is the bss section.
+	     */
+	    k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
+	    if (k > last_bss)
+		last_bss = k;
+	  }
+	}
+
+	/*
+	 * Now fill out the bss section.  First pad the last page up
+	 * to the page boundary, and then perform a mmap to make sure
+	 * that there are zero-mapped pages up to and including the 
+	 * last bss page.
+	 */
+	if (padzero(elf_bss)) {
+		error = -EFAULT;
+		goto out_close;
+	}
+
+	elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);	/* What we have mapped so far */
+
+	/* Map the last of the bss segment */
+	if (last_bss > elf_bss) {
+		down_write(&current->mm->mmap_sem);
+		error = do_brk(elf_bss, last_bss - elf_bss);
+		up_write(&current->mm->mmap_sem);
+		if (BAD_ADDR(error))
+			goto out_close;
+	}
+
+	*interp_load_addr = load_addr;
+	error = ((unsigned long) interp_elf_ex->e_entry) + load_addr;
+
+out_close:
+	kfree(elf_phdata);
+out:
+	return error;
+}
+
+static unsigned long load_aout_interp(struct exec * interp_ex,
+			     struct file * interpreter)
+{
+	unsigned long text_data, elf_entry = ~0UL;
+	char __user * addr;
+	loff_t offset;
+
+	current->mm->end_code = interp_ex->a_text;
+	text_data = interp_ex->a_text + interp_ex->a_data;
+	current->mm->end_data = text_data;
+	current->mm->brk = interp_ex->a_bss + text_data;
+
+	switch (N_MAGIC(*interp_ex)) {
+	case OMAGIC:
+		offset = 32;
+		addr = (char __user *)0;
+		break;
+	case ZMAGIC:
+	case QMAGIC:
+		offset = N_TXTOFF(*interp_ex);
+		addr = (char __user *) N_TXTADDR(*interp_ex);
+		break;
+	default:
+		goto out;
+	}
+
+	down_write(&current->mm->mmap_sem);	
+	do_brk(0, text_data);
+	up_write(&current->mm->mmap_sem);
+	if (!interpreter->f_op || !interpreter->f_op->read)
+		goto out;
+	if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
+		goto out;
+	flush_icache_range((unsigned long)addr,
+	                   (unsigned long)addr + text_data);
+
+
+	down_write(&current->mm->mmap_sem);	
+	do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
+		interp_ex->a_bss);
+	up_write(&current->mm->mmap_sem);
+	elf_entry = interp_ex->a_entry;
+
+out:
+	return elf_entry;
+}
+
+/*
+ * These are the functions used to load ELF style executables and shared
+ * libraries.  There is no binary dependent code anywhere else.
+ */
+
+#define INTERPRETER_NONE 0
+#define INTERPRETER_AOUT 1
+#define INTERPRETER_ELF 2
+
+
+static unsigned long randomize_stack_top(unsigned long stack_top)
+{
+	unsigned int random_variable = 0;
+
+	if (current->flags & PF_RANDOMIZE)
+		random_variable = get_random_int() % (8*1024*1024);
+#ifdef CONFIG_STACK_GROWSUP
+	return PAGE_ALIGN(stack_top + random_variable);
+#else
+	return PAGE_ALIGN(stack_top - random_variable);
+#endif
+}
+
+static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
+{
+	struct file *interpreter = NULL; /* to shut gcc up */
+ 	unsigned long load_addr = 0, load_bias = 0;
+	int load_addr_set = 0;
+	char * elf_interpreter = NULL;
+	unsigned int interpreter_type = INTERPRETER_NONE;
+	unsigned char ibcs2_interpreter = 0;
+	unsigned long error;
+	struct elf_phdr * elf_ppnt, *elf_phdata;
+	unsigned long elf_bss, elf_brk;
+	int elf_exec_fileno;
+	int retval, i;
+	unsigned int size;
+	unsigned long elf_entry, interp_load_addr = 0;
+	unsigned long start_code, end_code, start_data, end_data;
+	unsigned long reloc_func_desc = 0;
+	char passed_fileno[6];
+	struct files_struct *files;
+	int have_pt_gnu_stack, executable_stack = EXSTACK_DEFAULT;
+	unsigned long def_flags = 0;
+	struct {
+		struct elfhdr elf_ex;
+		struct elfhdr interp_elf_ex;
+  		struct exec interp_ex;
+	} *loc;
+
+	loc = kmalloc(sizeof(*loc), GFP_KERNEL);
+	if (!loc) {
+		retval = -ENOMEM;
+		goto out_ret;
+	}
+	
+	/* Get the exec-header */
+	loc->elf_ex = *((struct elfhdr *) bprm->buf);
+
+	retval = -ENOEXEC;
+	/* First of all, some simple consistency checks */
+	if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
+		goto out;
+
+	if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
+		goto out;
+	if (!elf_check_arch(&loc->elf_ex))
+		goto out;
+	if (!bprm->file->f_op||!bprm->file->f_op->mmap)
+		goto out;
+
+	/* Now read in all of the header information */
+
+	if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
+		goto out;
+	if (loc->elf_ex.e_phnum < 1 ||
+	 	loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
+		goto out;
+	size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
+	retval = -ENOMEM;
+	elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
+	if (!elf_phdata)
+		goto out;
+
+	retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, (char *) elf_phdata, size);
+	if (retval != size) {
+		if (retval >= 0)
+			retval = -EIO;
+		goto out_free_ph;
+	}
+
+	files = current->files;		/* Refcounted so ok */
+	retval = unshare_files();
+	if (retval < 0)
+		goto out_free_ph;
+	if (files == current->files) {
+		put_files_struct(files);
+		files = NULL;
+	}
+
+	/* exec will make our files private anyway, but for the a.out
+	   loader stuff we need to do it earlier */
+
+	retval = get_unused_fd();
+	if (retval < 0)
+		goto out_free_fh;
+	get_file(bprm->file);
+	fd_install(elf_exec_fileno = retval, bprm->file);
+
+	elf_ppnt = elf_phdata;
+	elf_bss = 0;
+	elf_brk = 0;
+
+	start_code = ~0UL;
+	end_code = 0;
+	start_data = 0;
+	end_data = 0;
+
+	for (i = 0; i < loc->elf_ex.e_phnum; i++) {
+		if (elf_ppnt->p_type == PT_INTERP) {
+			/* This is the program interpreter used for
+			 * shared libraries - for now assume that this
+			 * is an a.out format binary
+			 */
+
+			retval = -ENOEXEC;
+			if (elf_ppnt->p_filesz > PATH_MAX || 
+			    elf_ppnt->p_filesz < 2)
+				goto out_free_file;
+
+			retval = -ENOMEM;
+			elf_interpreter = (char *) kmalloc(elf_ppnt->p_filesz,
+							   GFP_KERNEL);
+			if (!elf_interpreter)
+				goto out_free_file;
+
+			retval = kernel_read(bprm->file, elf_ppnt->p_offset,
+					   elf_interpreter,
+					   elf_ppnt->p_filesz);
+			if (retval != elf_ppnt->p_filesz) {
+				if (retval >= 0)
+					retval = -EIO;
+				goto out_free_interp;
+			}
+			/* make sure path is NULL terminated */
+			retval = -ENOEXEC;
+			if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
+				goto out_free_interp;
+
+			/* If the program interpreter is one of these two,
+			 * then assume an iBCS2 image. Otherwise assume
+			 * a native linux image.
+			 */
+			if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
+			    strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
+				ibcs2_interpreter = 1;
+
+			/*
+			 * The early SET_PERSONALITY here is so that the lookup
+			 * for the interpreter happens in the namespace of the 
+			 * to-be-execed image.  SET_PERSONALITY can select an
+			 * alternate root.
+			 *
+			 * However, SET_PERSONALITY is NOT allowed to switch
+			 * this task into the new images's memory mapping
+			 * policy - that is, TASK_SIZE must still evaluate to
+			 * that which is appropriate to the execing application.
+			 * This is because exit_mmap() needs to have TASK_SIZE
+			 * evaluate to the size of the old image.
+			 *
+			 * So if (say) a 64-bit application is execing a 32-bit
+			 * application it is the architecture's responsibility
+			 * to defer changing the value of TASK_SIZE until the
+			 * switch really is going to happen - do this in
+			 * flush_thread().	- akpm
+			 */
+			SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
+
+			interpreter = open_exec(elf_interpreter);
+			retval = PTR_ERR(interpreter);
+			if (IS_ERR(interpreter))
+				goto out_free_interp;
+			retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE);
+			if (retval != BINPRM_BUF_SIZE) {
+				if (retval >= 0)
+					retval = -EIO;
+				goto out_free_dentry;
+			}
+
+			/* Get the exec headers */
+			loc->interp_ex = *((struct exec *) bprm->buf);
+			loc->interp_elf_ex = *((struct elfhdr *) bprm->buf);
+			break;
+		}
+		elf_ppnt++;
+	}
+
+	elf_ppnt = elf_phdata;
+	for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
+		if (elf_ppnt->p_type == PT_GNU_STACK) {
+			if (elf_ppnt->p_flags & PF_X)
+				executable_stack = EXSTACK_ENABLE_X;
+			else
+				executable_stack = EXSTACK_DISABLE_X;
+			break;
+		}
+	have_pt_gnu_stack = (i < loc->elf_ex.e_phnum);
+
+	/* Some simple consistency checks for the interpreter */
+	if (elf_interpreter) {
+		interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
+
+		/* Now figure out which format our binary is */
+		if ((N_MAGIC(loc->interp_ex) != OMAGIC) &&
+		    (N_MAGIC(loc->interp_ex) != ZMAGIC) &&
+		    (N_MAGIC(loc->interp_ex) != QMAGIC))
+			interpreter_type = INTERPRETER_ELF;
+
+		if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
+			interpreter_type &= ~INTERPRETER_ELF;
+
+		retval = -ELIBBAD;
+		if (!interpreter_type)
+			goto out_free_dentry;
+
+		/* Make sure only one type was selected */
+		if ((interpreter_type & INTERPRETER_ELF) &&
+		     interpreter_type != INTERPRETER_ELF) {
+	     		// FIXME - ratelimit this before re-enabling
+			// printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
+			interpreter_type = INTERPRETER_ELF;
+		}
+		/* Verify the interpreter has a valid arch */
+		if ((interpreter_type == INTERPRETER_ELF) &&
+		    !elf_check_arch(&loc->interp_elf_ex))
+			goto out_free_dentry;
+	} else {
+		/* Executables without an interpreter also need a personality  */
+		SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
+	}
+
+	/* OK, we are done with that, now set up the arg stuff,
+	   and then start this sucker up */
+
+	if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) {
+		char *passed_p = passed_fileno;
+		sprintf(passed_fileno, "%d", elf_exec_fileno);
+
+		if (elf_interpreter) {
+			retval = copy_strings_kernel(1, &passed_p, bprm);
+			if (retval)
+				goto out_free_dentry; 
+			bprm->argc++;
+		}
+	}
+
+	/* Flush all traces of the currently running executable */
+	retval = flush_old_exec(bprm);
+	if (retval)
+		goto out_free_dentry;
+
+	/* Discard our unneeded old files struct */
+	if (files) {
+		steal_locks(files);
+		put_files_struct(files);
+		files = NULL;
+	}
+
+	/* OK, This is the point of no return */
+	current->mm->start_data = 0;
+	current->mm->end_data = 0;
+	current->mm->end_code = 0;
+	current->mm->mmap = NULL;
+	current->flags &= ~PF_FORKNOEXEC;
+	current->mm->def_flags = def_flags;
+
+	/* Do this immediately, since STACK_TOP as used in setup_arg_pages
+	   may depend on the personality.  */
+	SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
+	if (elf_read_implies_exec(loc->elf_ex, executable_stack))
+		current->personality |= READ_IMPLIES_EXEC;
+
+	if ( !(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+		current->flags |= PF_RANDOMIZE;
+	arch_pick_mmap_layout(current->mm);
+
+	/* Do this so that we can load the interpreter, if need be.  We will
+	   change some of these later */
+	set_mm_counter(current->mm, rss, 0);
+	current->mm->free_area_cache = current->mm->mmap_base;
+	retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
+				 executable_stack);
+	if (retval < 0) {
+		send_sig(SIGKILL, current, 0);
+		goto out_free_dentry;
+	}
+	
+#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
+	retval = arch_setup_additional_pages(bprm, executable_stack);
+	if (retval < 0) {
+		send_sig(SIGKILL, current, 0);
+		goto out_free_dentry;
+	}
+#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
+
+	current->mm->start_stack = bprm->p;
+
+	/* Now we do a little grungy work by mmaping the ELF image into
+	   the correct location in memory.  At this point, we assume that
+	   the image should be loaded at fixed address, not at a variable
+	   address. */
+
+	for(i = 0, elf_ppnt = elf_phdata; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
+		int elf_prot = 0, elf_flags;
+		unsigned long k, vaddr;
+
+		if (elf_ppnt->p_type != PT_LOAD)
+			continue;
+
+		if (unlikely (elf_brk > elf_bss)) {
+			unsigned long nbyte;
+	            
+			/* There was a PT_LOAD segment with p_memsz > p_filesz
+			   before this one. Map anonymous pages, if needed,
+			   and clear the area.  */
+			retval = set_brk (elf_bss + load_bias,
+					  elf_brk + load_bias);
+			if (retval) {
+				send_sig(SIGKILL, current, 0);
+				goto out_free_dentry;
+			}
+			nbyte = ELF_PAGEOFFSET(elf_bss);
+			if (nbyte) {
+				nbyte = ELF_MIN_ALIGN - nbyte;
+				if (nbyte > elf_brk - elf_bss)
+					nbyte = elf_brk - elf_bss;
+				if (clear_user((void __user *)elf_bss +
+							load_bias, nbyte)) {
+					/*
+					 * This bss-zeroing can fail if the ELF
+					 * file specifies odd protections.  So
+					 * we don't check the return value
+					 */
+				}
+			}
+		}
+
+		if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
+		if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
+		if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
+
+		elf_flags = MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
+
+		vaddr = elf_ppnt->p_vaddr;
+		if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
+			elf_flags |= MAP_FIXED;
+		} else if (loc->elf_ex.e_type == ET_DYN) {
+			/* Try and get dynamic programs out of the way of the default mmap
+			   base, as well as whatever program they might try to exec.  This
+			   is because the brk will follow the loader, and is not movable.  */
+			load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
+		}
+
+		error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, elf_prot, elf_flags);
+		if (BAD_ADDR(error)) {
+			send_sig(SIGKILL, current, 0);
+			goto out_free_dentry;
+		}
+
+		if (!load_addr_set) {
+			load_addr_set = 1;
+			load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
+			if (loc->elf_ex.e_type == ET_DYN) {
+				load_bias += error -
+				             ELF_PAGESTART(load_bias + vaddr);
+				load_addr += load_bias;
+				reloc_func_desc = load_bias;
+			}
+		}
+		k = elf_ppnt->p_vaddr;
+		if (k < start_code) start_code = k;
+		if (start_data < k) start_data = k;
+
+		/*
+		 * Check to see if the section's size will overflow the
+		 * allowed task size. Note that p_filesz must always be
+		 * <= p_memsz so it is only necessary to check p_memsz.
+		 */
+		if (k > TASK_SIZE || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
+		    elf_ppnt->p_memsz > TASK_SIZE ||
+		    TASK_SIZE - elf_ppnt->p_memsz < k) {
+			/* set_brk can never work.  Avoid overflows.  */
+			send_sig(SIGKILL, current, 0);
+			goto out_free_dentry;
+		}
+
+		k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
+
+		if (k > elf_bss)
+			elf_bss = k;
+		if ((elf_ppnt->p_flags & PF_X) && end_code < k)
+			end_code = k;
+		if (end_data < k)
+			end_data = k;
+		k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
+		if (k > elf_brk)
+			elf_brk = k;
+	}
+
+	loc->elf_ex.e_entry += load_bias;
+	elf_bss += load_bias;
+	elf_brk += load_bias;
+	start_code += load_bias;
+	end_code += load_bias;
+	start_data += load_bias;
+	end_data += load_bias;
+
+	/* Calling set_brk effectively mmaps the pages that we need
+	 * for the bss and break sections.  We must do this before
+	 * mapping in the interpreter, to make sure it doesn't wind
+	 * up getting placed where the bss needs to go.
+	 */
+	retval = set_brk(elf_bss, elf_brk);
+	if (retval) {
+		send_sig(SIGKILL, current, 0);
+		goto out_free_dentry;
+	}
+	if (padzero(elf_bss)) {
+		send_sig(SIGSEGV, current, 0);
+		retval = -EFAULT; /* Nobody gets to see this, but.. */
+		goto out_free_dentry;
+	}
+
+	if (elf_interpreter) {
+		if (interpreter_type == INTERPRETER_AOUT)
+			elf_entry = load_aout_interp(&loc->interp_ex,
+						     interpreter);
+		else
+			elf_entry = load_elf_interp(&loc->interp_elf_ex,
+						    interpreter,
+						    &interp_load_addr);
+		if (BAD_ADDR(elf_entry)) {
+			printk(KERN_ERR "Unable to load interpreter %.128s\n",
+				elf_interpreter);
+			force_sig(SIGSEGV, current);
+			retval = -ENOEXEC; /* Nobody gets to see this, but.. */
+			goto out_free_dentry;
+		}
+		reloc_func_desc = interp_load_addr;
+
+		allow_write_access(interpreter);
+		fput(interpreter);
+		kfree(elf_interpreter);
+	} else {
+		elf_entry = loc->elf_ex.e_entry;
+	}
+
+	kfree(elf_phdata);
+
+	if (interpreter_type != INTERPRETER_AOUT)
+		sys_close(elf_exec_fileno);
+
+	set_binfmt(&elf_format);
+
+	compute_creds(bprm);
+	current->flags &= ~PF_FORKNOEXEC;
+	create_elf_tables(bprm, &loc->elf_ex, (interpreter_type == INTERPRETER_AOUT),
+			load_addr, interp_load_addr);
+	/* N.B. passed_fileno might not be initialized? */
+	if (interpreter_type == INTERPRETER_AOUT)
+		current->mm->arg_start += strlen(passed_fileno) + 1;
+	current->mm->end_code = end_code;
+	current->mm->start_code = start_code;
+	current->mm->start_data = start_data;
+	current->mm->end_data = end_data;
+	current->mm->start_stack = bprm->p;
+
+	if (current->personality & MMAP_PAGE_ZERO) {
+		/* Why this, you ask???  Well SVr4 maps page 0 as read-only,
+		   and some applications "depend" upon this behavior.
+		   Since we do not have the power to recompile these, we
+		   emulate the SVr4 behavior.  Sigh.  */
+		down_write(&current->mm->mmap_sem);
+		error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
+				MAP_FIXED | MAP_PRIVATE, 0);
+		up_write(&current->mm->mmap_sem);
+	}
+
+#ifdef ELF_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.  In addition, it may also specify (eg, PowerPC64 ELF)
+	 * that the e_entry field is the address of the function descriptor
+	 * for the startup routine, rather than the address of the startup
+	 * routine itself.  This macro performs whatever initialization to
+	 * the regs structure is required as well as any relocations to the
+	 * function descriptor entries when executing dynamically links apps.
+	 */
+	ELF_PLAT_INIT(regs, reloc_func_desc);
+#endif
+
+	start_thread(regs, elf_entry, bprm->p);
+	if (unlikely(current->ptrace & PT_PTRACED)) {
+		if (current->ptrace & PT_TRACE_EXEC)
+			ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
+		else
+			send_sig(SIGTRAP, current, 0);
+	}
+	retval = 0;
+out:
+	kfree(loc);
+out_ret:
+	return retval;
+
+	/* error cleanup */
+out_free_dentry:
+	allow_write_access(interpreter);
+	if (interpreter)
+		fput(interpreter);
+out_free_interp:
+	if (elf_interpreter)
+		kfree(elf_interpreter);
+out_free_file:
+	sys_close(elf_exec_fileno);
+out_free_fh:
+	if (files) {
+		put_files_struct(current->files);
+		current->files = files;
+	}
+out_free_ph:
+	kfree(elf_phdata);
+	goto out;
+}
+
+/* This is really simpleminded and specialized - we are loading an
+   a.out library that is given an ELF header. */
+
+static int load_elf_library(struct file *file)
+{
+	struct elf_phdr *elf_phdata;
+	struct elf_phdr *eppnt;
+	unsigned long elf_bss, bss, len;
+	int retval, error, i, j;
+	struct elfhdr elf_ex;
+
+	error = -ENOEXEC;
+	retval = kernel_read(file, 0, (char *) &elf_ex, sizeof(elf_ex));
+	if (retval != sizeof(elf_ex))
+		goto out;
+
+	if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
+		goto out;
+
+	/* First of all, some simple consistency checks */
+	if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
+	   !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
+		goto out;
+
+	/* Now read in all of the header information */
+
+	j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
+	/* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
+
+	error = -ENOMEM;
+	elf_phdata = kmalloc(j, GFP_KERNEL);
+	if (!elf_phdata)
+		goto out;
+
+	eppnt = elf_phdata;
+	error = -ENOEXEC;
+	retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
+	if (retval != j)
+		goto out_free_ph;
+
+	for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
+		if ((eppnt + i)->p_type == PT_LOAD)
+			j++;
+	if (j != 1)
+		goto out_free_ph;
+
+	while (eppnt->p_type != PT_LOAD)
+		eppnt++;
+
+	/* Now use mmap to map the library into memory. */
+	down_write(&current->mm->mmap_sem);
+	error = do_mmap(file,
+			ELF_PAGESTART(eppnt->p_vaddr),
+			(eppnt->p_filesz +
+			 ELF_PAGEOFFSET(eppnt->p_vaddr)),
+			PROT_READ | PROT_WRITE | PROT_EXEC,
+			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
+			(eppnt->p_offset -
+			 ELF_PAGEOFFSET(eppnt->p_vaddr)));
+	up_write(&current->mm->mmap_sem);
+	if (error != ELF_PAGESTART(eppnt->p_vaddr))
+		goto out_free_ph;
+
+	elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
+	if (padzero(elf_bss)) {
+		error = -EFAULT;
+		goto out_free_ph;
+	}
+
+	len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1);
+	bss = eppnt->p_memsz + eppnt->p_vaddr;
+	if (bss > len) {
+		down_write(&current->mm->mmap_sem);
+		do_brk(len, bss - len);
+		up_write(&current->mm->mmap_sem);
+	}
+	error = 0;
+
+out_free_ph:
+	kfree(elf_phdata);
+out:
+	return error;
+}
+
+/*
+ * Note that some platforms still use traditional core dumps and not
+ * the ELF core dump.  Each platform can select it as appropriate.
+ */
+#ifdef USE_ELF_CORE_DUMP
+
+/*
+ * ELF core dumper
+ *
+ * Modelled on fs/exec.c:aout_core_dump()
+ * Jeremy Fitzhardinge <jeremy@sw.oz.au>
+ */
+/*
+ * These are the only things you should do on a core-file: use only these
+ * functions to write out all the necessary info.
+ */
+static int dump_write(struct file *file, const void *addr, int nr)
+{
+	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+}
+
+static int dump_seek(struct file *file, off_t off)
+{
+	if (file->f_op->llseek) {
+		if (file->f_op->llseek(file, off, 0) != off)
+			return 0;
+	} else
+		file->f_pos = off;
+	return 1;
+}
+
+/*
+ * Decide whether a segment is worth dumping; default is yes to be
+ * sure (missing info is worse than too much; etc).
+ * Personally I'd include everything, and use the coredump limit...
+ *
+ * I think we should skip something. But I am not sure how. H.J.
+ */
+static int maydump(struct vm_area_struct *vma)
+{
+	/* Do not dump I/O mapped devices or special mappings */
+	if (vma->vm_flags & (VM_IO | VM_RESERVED))
+		return 0;
+
+	/* Dump shared memory only if mapped from an anonymous file.  */
+	if (vma->vm_flags & VM_SHARED)
+		return vma->vm_file->f_dentry->d_inode->i_nlink == 0;
+
+	/* If it hasn't been written to, don't write it out */
+	if (!vma->anon_vma)
+		return 0;
+
+	return 1;
+}
+
+#define roundup(x, y)  ((((x)+((y)-1))/(y))*(y))
+
+/* 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 DUMP_WRITE(addr, nr)	\
+	do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
+#define DUMP_SEEK(off)	\
+	do { if (!dump_seek(file, (off))) return 0; } while(0)
+
+static int writenote(struct memelfnote *men, struct file *file)
+{
+	struct elf_note en;
+
+	en.n_namesz = strlen(men->name) + 1;
+	en.n_descsz = men->datasz;
+	en.n_type = men->type;
+
+	DUMP_WRITE(&en, sizeof(en));
+	DUMP_WRITE(men->name, en.n_namesz);
+	/* XXX - cast from long long to long to avoid need for libgcc.a */
+	DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));	/* XXX */
+	DUMP_WRITE(men->data, men->datasz);
+	DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));	/* XXX */
+
+	return 1;
+}
+#undef DUMP_WRITE
+#undef DUMP_SEEK
+
+#define DUMP_WRITE(addr, nr)	\
+	if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
+		goto end_coredump;
+#define DUMP_SEEK(off)	\
+	if (!dump_seek(file, (off))) \
+		goto end_coredump;
+
+static inline void fill_elf_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_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, off_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 = 0;
+	return;
+}
+
+static 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 *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];
+	prstatus->pr_pid = p->pid;
+	prstatus->pr_ppid = p->parent->pid;
+	prstatus->pr_pgrp = process_group(p);
+	prstatus->pr_sid = p->signal->session;
+	if (thread_group_leader(p)) {
+		/*
+		 * This is the record for the group leader.  Add in the
+		 * cumulative times of previous dead threads.  This total
+		 * won't include the time of each live thread whose state
+		 * is included in the core dump.  The final total reported
+		 * to our parent process when it calls wait4 will include
+		 * those sums as well as the little bit more time it takes
+		 * this and each other thread to finish dying after the
+		 * core dump synchronization phase.
+		 */
+		cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
+				   &prstatus->pr_utime);
+		cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
+				   &prstatus->pr_stime);
+	} else {
+		cputime_to_timeval(p->utime, &prstatus->pr_utime);
+		cputime_to_timeval(p->stime, &prstatus->pr_stime);
+	}
+	cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
+	cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
+}
+
+static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
+		       struct mm_struct *mm)
+{
+	int i, len;
+	
+	/* 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;
+
+	psinfo->pr_pid = p->pid;
+	psinfo->pr_ppid = p->parent->pid;
+	psinfo->pr_pgrp = process_group(p);
+	psinfo->pr_sid = p->signal->session;
+
+	i = p->state ? ffz(~p->state) + 1 : 0;
+	psinfo->pr_state = i;
+	psinfo->pr_sname = (i < 0 || i > 5) ? '.' : "RSDTZW"[i];
+	psinfo->pr_zomb = psinfo->pr_sname == 'Z';
+	psinfo->pr_nice = task_nice(p);
+	psinfo->pr_flag = p->flags;
+	SET_UID(psinfo->pr_uid, p->uid);
+	SET_GID(psinfo->pr_gid, p->gid);
+	strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
+	
+	return 0;
+}
+
+/* Here is the structure in which status of each thread is captured. */
+struct elf_thread_status
+{
+	struct list_head list;
+	struct elf_prstatus prstatus;	/* NT_PRSTATUS */
+	elf_fpregset_t fpu;		/* NT_PRFPREG */
+	struct task_struct *thread;
+#ifdef ELF_CORE_COPY_XFPREGS
+	elf_fpxregset_t xfpu;		/* NT_PRXFPREG */
+#endif
+	struct memelfnote notes[3];
+	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 threads pr_status and then
+ * create a single section for them in the final core file.
+ */
+static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
+{
+	int sz = 0;
+	struct task_struct *p = t->thread;
+	t->num_notes = 0;
+
+	fill_prstatus(&t->prstatus, p, signr);
+	elf_core_copy_task_regs(p, &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]);
+
+	if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu))) {
+		fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &(t->fpu));
+		t->num_notes++;
+		sz += notesize(&t->notes[1]);
+	}
+
+#ifdef ELF_CORE_COPY_XFPREGS
+	if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
+		fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), &t->xfpu);
+		t->num_notes++;
+		sz += notesize(&t->notes[2]);
+	}
+#endif	
+	return sz;
+}
+
+/*
+ * 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_core_dump(long signr, struct pt_regs * regs, struct file * file)
+{
+#define	NUM_NOTES	6
+	int has_dumped = 0;
+	mm_segment_t fs;
+	int segs;
+	size_t size = 0;
+	int i;
+	struct vm_area_struct *vma;
+	struct elfhdr *elf = NULL;
+	off_t offset = 0, dataoff;
+	unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
+	int numnote;
+	struct memelfnote *notes = NULL;
+	struct elf_prstatus *prstatus = NULL;	/* NT_PRSTATUS */
+	struct elf_prpsinfo *psinfo = NULL;	/* NT_PRPSINFO */
+ 	struct task_struct *g, *p;
+ 	LIST_HEAD(thread_list);
+ 	struct list_head *t;
+	elf_fpregset_t *fpu = NULL;
+#ifdef ELF_CORE_COPY_XFPREGS
+	elf_fpxregset_t *xfpu = NULL;
+#endif
+	int thread_status_size = 0;
+	elf_addr_t *auxv;
+
+	/*
+	 * We no longer stop all VM operations.
+	 * 
+	 * This is because those proceses that could possibly change map_count or
+	 * the mmap / vma pages are now blocked in do_exit on current finishing
+	 * this core dump.
+	 *
+	 * Only ptrace can touch these memory addresses, but it doesn't change
+	 * the map_count or the pages allocated.  So no possibility of crashing
+	 * exists while dumping the mm->vm_next areas to the core file.
+	 */
+  
+	/* alloc memory for large data structures: too large to be on stack */
+	elf = kmalloc(sizeof(*elf), GFP_KERNEL);
+	if (!elf)
+		goto cleanup;
+	prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
+	if (!prstatus)
+		goto cleanup;
+	psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
+	if (!psinfo)
+		goto cleanup;
+	notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
+	if (!notes)
+		goto cleanup;
+	fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
+	if (!fpu)
+		goto cleanup;
+#ifdef ELF_CORE_COPY_XFPREGS
+	xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
+	if (!xfpu)
+		goto cleanup;
+#endif
+
+	if (signr) {
+		struct elf_thread_status *tmp;
+		read_lock(&tasklist_lock);
+		do_each_thread(g,p)
+			if (current->mm == p->mm && current != p) {
+				tmp = kmalloc(sizeof(*tmp), GFP_ATOMIC);
+				if (!tmp) {
+					read_unlock(&tasklist_lock);
+					goto cleanup;
+				}
+				memset(tmp, 0, sizeof(*tmp));
+				INIT_LIST_HEAD(&tmp->list);
+				tmp->thread = p;
+				list_add(&tmp->list, &thread_list);
+			}
+		while_each_thread(g,p);
+		read_unlock(&tasklist_lock);
+		list_for_each(t, &thread_list) {
+			struct elf_thread_status *tmp;
+			int sz;
+
+			tmp = list_entry(t, struct elf_thread_status, list);
+			sz = elf_dump_thread_status(signr, tmp);
+			thread_status_size += sz;
+		}
+	}
+	/* now collect the dump for the current */
+	memset(prstatus, 0, sizeof(*prstatus));
+	fill_prstatus(prstatus, current, signr);
+	elf_core_copy_regs(&prstatus->pr_reg, regs);
+	
+	segs = current->mm->map_count;
+#ifdef ELF_CORE_EXTRA_PHDRS
+	segs += ELF_CORE_EXTRA_PHDRS;
+#endif
+
+	/* Set up header */
+	fill_elf_header(elf, segs+1);	/* including notes section */
+
+	has_dumped = 1;
+	current->flags |= PF_DUMPCORE;
+
+	/*
+	 * Set up the notes in similar form to SVR4 core dumps made
+	 * with info from their /proc.
+	 */
+
+	fill_note(notes +0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
+	
+	fill_psinfo(psinfo, current->group_leader, current->mm);
+	fill_note(notes +1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
+	
+	fill_note(notes +2, "CORE", NT_TASKSTRUCT, sizeof(*current), current);
+  
+	numnote = 3;
+
+	auxv = (elf_addr_t *) current->mm->saved_auxv;
+
+	i = 0;
+	do
+		i += 2;
+	while (auxv[i - 2] != AT_NULL);
+	fill_note(&notes[numnote++], "CORE", NT_AUXV,
+		  i * sizeof (elf_addr_t), auxv);
+
+  	/* Try to dump the FPU. */
+	if ((prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, fpu)))
+		fill_note(notes + numnote++,
+			  "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
+#ifdef ELF_CORE_COPY_XFPREGS
+	if (elf_core_copy_task_xfpregs(current, xfpu))
+		fill_note(notes + numnote++,
+			  "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
+#endif	
+  
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+
+	DUMP_WRITE(elf, sizeof(*elf));
+	offset += sizeof(*elf);				/* Elf header */
+	offset += (segs+1) * sizeof(struct elf_phdr);	/* Program headers */
+
+	/* Write notes phdr entry */
+	{
+		struct elf_phdr phdr;
+		int sz = 0;
+
+		for (i = 0; i < numnote; i++)
+			sz += notesize(notes + i);
+		
+		sz += thread_status_size;
+
+		fill_elf_note_phdr(&phdr, sz, offset);
+		offset += sz;
+		DUMP_WRITE(&phdr, sizeof(phdr));
+	}
+
+	/* Page-align dumped data */
+	dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
+
+	/* Write program headers for segments dump */
+	for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
+		struct elf_phdr phdr;
+		size_t sz;
+
+		sz = vma->vm_end - vma->vm_start;
+
+		phdr.p_type = PT_LOAD;
+		phdr.p_offset = offset;
+		phdr.p_vaddr = vma->vm_start;
+		phdr.p_paddr = 0;
+		phdr.p_filesz = maydump(vma) ? sz : 0;
+		phdr.p_memsz = sz;
+		offset += phdr.p_filesz;
+		phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
+		if (vma->vm_flags & VM_WRITE) phdr.p_flags |= PF_W;
+		if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X;
+		phdr.p_align = ELF_EXEC_PAGESIZE;
+
+		DUMP_WRITE(&phdr, sizeof(phdr));
+	}
+
+#ifdef ELF_CORE_WRITE_EXTRA_PHDRS
+	ELF_CORE_WRITE_EXTRA_PHDRS;
+#endif
+
+ 	/* write out the notes section */
+	for (i = 0; i < numnote; i++)
+		if (!writenote(notes + i, file))
+			goto end_coredump;
+
+	/* write out the thread status notes section */
+	list_for_each(t, &thread_list) {
+		struct elf_thread_status *tmp = list_entry(t, struct elf_thread_status, list);
+		for (i = 0; i < tmp->num_notes; i++)
+			if (!writenote(&tmp->notes[i], file))
+				goto end_coredump;
+	}
+ 
+	DUMP_SEEK(dataoff);
+
+	for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
+		unsigned long addr;
+
+		if (!maydump(vma))
+			continue;
+
+		for (addr = vma->vm_start;
+		     addr < vma->vm_end;
+		     addr += PAGE_SIZE) {
+			struct page* page;
+			struct vm_area_struct *vma;
+
+			if (get_user_pages(current, current->mm, addr, 1, 0, 1,
+						&page, &vma) <= 0) {
+				DUMP_SEEK (file->f_pos + PAGE_SIZE);
+			} else {
+				if (page == ZERO_PAGE(addr)) {
+					DUMP_SEEK (file->f_pos + PAGE_SIZE);
+				} else {
+					void *kaddr;
+					flush_cache_page(vma, addr, page_to_pfn(page));
+					kaddr = kmap(page);
+					if ((size += PAGE_SIZE) > limit ||
+					    !dump_write(file, kaddr,
+					    PAGE_SIZE)) {
+						kunmap(page);
+						page_cache_release(page);
+						goto end_coredump;
+					}
+					kunmap(page);
+				}
+				page_cache_release(page);
+			}
+		}
+	}
+
+#ifdef ELF_CORE_WRITE_EXTRA_DATA
+	ELF_CORE_WRITE_EXTRA_DATA;
+#endif
+
+	if ((off_t) file->f_pos != offset) {
+		/* Sanity check */
+		printk("elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
+		       (off_t) file->f_pos, offset);
+	}
+
+end_coredump:
+	set_fs(fs);
+
+cleanup:
+	while(!list_empty(&thread_list)) {
+		struct list_head *tmp = thread_list.next;
+		list_del(tmp);
+		kfree(list_entry(tmp, struct elf_thread_status, list));
+	}
+
+	kfree(elf);
+	kfree(prstatus);
+	kfree(psinfo);
+	kfree(notes);
+	kfree(fpu);
+#ifdef ELF_CORE_COPY_XFPREGS
+	kfree(xfpu);
+#endif
+	return has_dumped;
+#undef NUM_NOTES
+}
+
+#endif		/* USE_ELF_CORE_DUMP */
+
+static int __init init_elf_binfmt(void)
+{
+	return register_binfmt(&elf_format);
+}
+
+static void __exit exit_elf_binfmt(void)
+{
+	/* Remove the COFF and ELF loaders. */
+	unregister_binfmt(&elf_format);
+}
+
+core_initcall(init_elf_binfmt);
+module_exit(exit_elf_binfmt);
+MODULE_LICENSE("GPL");