[deliverable/linux.git] / arch / x86 / ia32 / ia32_aout.c

/*
 *  a.out loader for x86-64
 *
 *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
 *  Hacked together by Andi Kleen
 */

#include <linux/module.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/a.out.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/slab.h>
#include <linux/binfmts.h>
#include <linux/personality.h>
#include <linux/init.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/user32.h>
#include <asm/ia32.h>

#undef WARN_OLD
#undef CORE_DUMP /* probably broken */

static int load_aout_binary(struct linux_binprm *, struct pt_regs *regs);
static int load_aout_library(struct file *);

#ifdef CORE_DUMP
static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
			  unsigned long limit);

/*
 * fill in the user structure for a core dump..
 */
static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
{
	u32 fs, gs;

/* changed the size calculations - should hopefully work better. lbt */
	dump->magic = CMAGIC;
	dump->start_code = 0;
	dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
	dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
	dump->u_dsize = ((unsigned long)
			 (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
	dump->u_dsize -= dump->u_tsize;
	dump->u_ssize = 0;
	dump->u_debugreg[0] = current->thread.debugreg0;
	dump->u_debugreg[1] = current->thread.debugreg1;
	dump->u_debugreg[2] = current->thread.debugreg2;
	dump->u_debugreg[3] = current->thread.debugreg3;
	dump->u_debugreg[4] = 0;
	dump->u_debugreg[5] = 0;
	dump->u_debugreg[6] = current->thread.debugreg6;
	dump->u_debugreg[7] = current->thread.debugreg7;

	if (dump->start_stack < 0xc0000000) {
		unsigned long tmp;

		tmp = (unsigned long) (0xc0000000 - dump->start_stack);
		dump->u_ssize = tmp >> PAGE_SHIFT;
	}

	dump->regs.bx = regs->bx;
	dump->regs.cx = regs->cx;
	dump->regs.dx = regs->dx;
	dump->regs.si = regs->si;
	dump->regs.di = regs->di;
	dump->regs.bp = regs->bp;
	dump->regs.ax = regs->ax;
	dump->regs.ds = current->thread.ds;
	dump->regs.es = current->thread.es;
	asm("movl %%fs,%0" : "=r" (fs)); dump->regs.fs = fs;
	asm("movl %%gs,%0" : "=r" (gs)); dump->regs.gs = gs;
	dump->regs.orig_ax = regs->orig_ax;
	dump->regs.ip = regs->ip;
	dump->regs.cs = regs->cs;
	dump->regs.flags = regs->flags;
	dump->regs.sp = regs->sp;
	dump->regs.ss = regs->ss;

#if 1 /* FIXME */
	dump->u_fpvalid = 0;
#else
	dump->u_fpvalid = dump_fpu(regs, &dump->i387);
#endif
}

#endif

static struct linux_binfmt aout_format = {
	.module		= THIS_MODULE,
	.load_binary	= load_aout_binary,
	.load_shlib	= load_aout_library,
#ifdef CORE_DUMP
	.core_dump	= aout_core_dump,
#endif
	.min_coredump	= PAGE_SIZE
};

static void set_brk(unsigned long start, unsigned long end)
{
	start = PAGE_ALIGN(start);
	end = PAGE_ALIGN(end);
	if (end <= start)
		return;
	down_write(&current->mm->mmap_sem);
	do_brk(start, end - start);
	up_write(&current->mm->mmap_sem);
}

#ifdef CORE_DUMP
/*
 * These are the only things you should do on a core-file: use only these
 * macros 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;
}

#define DUMP_WRITE(addr, nr)			     \
	if (!dump_write(file, (void *)(addr), (nr))) \
		goto end_coredump;

#define DUMP_SEEK(offset)						\
	if (file->f_op->llseek) {					\
		if (file->f_op->llseek(file, (offset), 0) != (offset))	\
			goto end_coredump;				\
	} else								\
		file->f_pos = (offset)

#define START_DATA()	(u.u_tsize << PAGE_SHIFT)
#define START_STACK(u)	(u.start_stack)

/*
 * Routine writes a core dump image in the current directory.
 * Currently only a stub-function.
 *
 * Note that setuid/setgid files won't make a core-dump if the uid/gid
 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
 * field, which also makes sure the core-dumps won't be recursive if the
 * dumping of the process results in another error..
 */

static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
			  unsigned long limit)
{
	mm_segment_t fs;
	int has_dumped = 0;
	unsigned long dump_start, dump_size;
	struct user32 dump;

	fs = get_fs();
	set_fs(KERNEL_DS);
	has_dumped = 1;
	current->flags |= PF_DUMPCORE;
	strncpy(dump.u_comm, current->comm, sizeof(current->comm));
	dump.u_ar0 = (u32)(((unsigned long)(&dump.regs)) -
			   ((unsigned long)(&dump)));
	dump.signal = signr;
	dump_thread32(regs, &dump);

	/*
	 * If the size of the dump file exceeds the rlimit, then see
	 * what would happen if we wrote the stack, but not the data
	 * area.
	 */
	if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit)
		dump.u_dsize = 0;

	/* Make sure we have enough room to write the stack and data areas. */
	if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
		dump.u_ssize = 0;

	/* make sure we actually have a data and stack area to dump */
	set_fs(USER_DS);
	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
		       dump.u_dsize << PAGE_SHIFT))
		dump.u_dsize = 0;
	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
		       dump.u_ssize << PAGE_SHIFT))
		dump.u_ssize = 0;

	set_fs(KERNEL_DS);
	/* struct user */
	DUMP_WRITE(&dump, sizeof(dump));
	/* Now dump all of the user data.  Include malloced stuff as well */
	DUMP_SEEK(PAGE_SIZE);
	/* now we start writing out the user space info */
	set_fs(USER_DS);
	/* Dump the data area */
	if (dump.u_dsize != 0) {
		dump_start = START_DATA(dump);
		dump_size = dump.u_dsize << PAGE_SHIFT;
		DUMP_WRITE(dump_start, dump_size);
	}
	/* Now prepare to dump the stack area */
	if (dump.u_ssize != 0) {
		dump_start = START_STACK(dump);
		dump_size = dump.u_ssize << PAGE_SHIFT;
		DUMP_WRITE(dump_start, dump_size);
	}
	/*
	 * Finally dump the task struct.  Not be used by gdb, but
	 * could be useful
	 */
	set_fs(KERNEL_DS);
	DUMP_WRITE(current, sizeof(*current));
end_coredump:
	set_fs(fs);
	return has_dumped;
}
#endif

/*
 * create_aout_tables() parses the env- and arg-strings in new user
 * memory and creates the pointer tables from them, and puts their
 * addresses on the "stack", returning the new stack pointer value.
 */
static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
{
	u32 __user *argv, *envp, *sp;
	int argc = bprm->argc, envc = bprm->envc;

	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
	sp -= envc+1;
	envp = sp;
	sp -= argc+1;
	argv = sp;
	put_user((unsigned long) envp, --sp);
	put_user((unsigned long) argv, --sp);
	put_user(argc, --sp);
	current->mm->arg_start = (unsigned long) p;
	while (argc-- > 0) {
		char c;

		put_user((u32)(unsigned long)p, argv++);
		do {
			get_user(c, p++);
		} while (c);
	}
	put_user(0, argv);
	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
	while (envc-- > 0) {
		char c;

		put_user((u32)(unsigned long)p, envp++);
		do {
			get_user(c, p++);
		} while (c);
	}
	put_user(0, envp);
	current->mm->env_end = (unsigned long) p;
	return sp;
}

/*
 * These are the functions used to load a.out style executables and shared
 * libraries.  There is no binary dependent code anywhere else.
 */
static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs)
{
	unsigned long error, fd_offset, rlim;
	struct exec ex;
	int retval;

	ex = *((struct exec *) bprm->buf);		/* exec-header */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
	    i_size_read(bprm->file->f_path.dentry->d_inode) <
	    ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		return -ENOEXEC;
	}

	fd_offset = N_TXTOFF(ex);

	/* Check initial limits. This avoids letting people circumvent
	 * size limits imposed on them by creating programs with large
	 * arrays in the data or bss.
	 */
	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
	if (rlim >= RLIM_INFINITY)
		rlim = ~0;
	if (ex.a_data + ex.a_bss > rlim)
		return -ENOMEM;

	/* Flush all traces of the currently running executable */
	retval = flush_old_exec(bprm);
	if (retval)
		return retval;

	regs->cs = __USER32_CS;
	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
		regs->r13 = regs->r14 = regs->r15 = 0;

	/* OK, This is the point of no return */
	set_personality(PER_LINUX);
	set_thread_flag(TIF_IA32);
	clear_thread_flag(TIF_ABI_PENDING);

	current->mm->end_code = ex.a_text +
		(current->mm->start_code = N_TXTADDR(ex));
	current->mm->end_data = ex.a_data +
		(current->mm->start_data = N_DATADDR(ex));
	current->mm->brk = ex.a_bss +
		(current->mm->start_brk = N_BSSADDR(ex));
	current->mm->free_area_cache = TASK_UNMAPPED_BASE;
	current->mm->cached_hole_size = 0;

	current->mm->mmap = NULL;
	compute_creds(bprm);
	current->flags &= ~PF_FORKNOEXEC;

	if (N_MAGIC(ex) == OMAGIC) {
		unsigned long text_addr, map_size;
		loff_t pos;

		text_addr = N_TXTADDR(ex);

		pos = 32;
		map_size = ex.a_text+ex.a_data;

		down_write(&current->mm->mmap_sem);
		error = do_brk(text_addr & PAGE_MASK, map_size);
		up_write(&current->mm->mmap_sem);

		if (error != (text_addr & PAGE_MASK)) {
			send_sig(SIGKILL, current, 0);
			return error;
		}

		error = bprm->file->f_op->read(bprm->file,
			 (char __user *)text_addr,
			  ex.a_text+ex.a_data, &pos);
		if ((signed long)error < 0) {
			send_sig(SIGKILL, current, 0);
			return error;
		}

		flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
	} else {
#ifdef WARN_OLD
		static unsigned long error_time, error_time2;
		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
		    (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ) {
			printk(KERN_NOTICE "executable not page aligned\n");
			error_time2 = jiffies;
		}

		if ((fd_offset & ~PAGE_MASK) != 0 &&
		    (jiffies - error_time) > 5*HZ) {
			printk(KERN_WARNING
			       "fd_offset is not page aligned. Please convert "
			       "program: %s\n",
			       bprm->file->f_path.dentry->d_name.name);
			error_time = jiffies;
		}
#endif

		if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
			loff_t pos = fd_offset;

			down_write(&current->mm->mmap_sem);
			do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
			up_write(&current->mm->mmap_sem);
			bprm->file->f_op->read(bprm->file,
					(char __user *)N_TXTADDR(ex),
					ex.a_text+ex.a_data, &pos);
			flush_icache_range((unsigned long) N_TXTADDR(ex),
					   (unsigned long) N_TXTADDR(ex) +
					   ex.a_text+ex.a_data);
			goto beyond_if;
		}

		down_write(&current->mm->mmap_sem);
		error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
				PROT_READ | PROT_EXEC,
				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
				MAP_EXECUTABLE | MAP_32BIT,
				fd_offset);
		up_write(&current->mm->mmap_sem);

		if (error != N_TXTADDR(ex)) {
			send_sig(SIGKILL, current, 0);
			return error;
		}

		down_write(&current->mm->mmap_sem);
		error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
				PROT_READ | PROT_WRITE | PROT_EXEC,
				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
				MAP_EXECUTABLE | MAP_32BIT,
				fd_offset + ex.a_text);
		up_write(&current->mm->mmap_sem);
		if (error != N_DATADDR(ex)) {
			send_sig(SIGKILL, current, 0);
			return error;
		}
	}
beyond_if:
	set_binfmt(&aout_format);

	set_brk(current->mm->start_brk, current->mm->brk);

	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
	if (retval < 0) {
		/* Someone check-me: is this error path enough? */
		send_sig(SIGKILL, current, 0);
		return retval;
	}

	current->mm->start_stack =
		(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	/* start thread */
	asm volatile("movl %0,%%fs" :: "r" (0)); \
	asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS));
	load_gs_index(0);
	(regs)->ip = ex.a_entry;
	(regs)->sp = current->mm->start_stack;
	(regs)->flags = 0x200;
	(regs)->cs = __USER32_CS;
	(regs)->ss = __USER32_DS;
	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
	set_fs(USER_DS);
	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);
	}
	return 0;
}

static int load_aout_library(struct file *file)
{
	struct inode *inode;
	unsigned long bss, start_addr, len, error;
	int retval;
	struct exec ex;

	inode = file->f_path.dentry->d_inode;

	retval = -ENOEXEC;
	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
	if (error != sizeof(ex))
		goto out;

	/* We come in here for the regular a.out style of shared libraries */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
	    N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
	    i_size_read(inode) <
	    ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		goto out;
	}

	if (N_FLAGS(ex))
		goto out;

	/* For  QMAGIC, the starting address is 0x20 into the page.  We mask
	   this off to get the starting address for the page */

	start_addr =  ex.a_entry & 0xfffff000;

	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
		loff_t pos = N_TXTOFF(ex);

#ifdef WARN_OLD
		static unsigned long error_time;
		if ((jiffies-error_time) > 5*HZ) {
			printk(KERN_WARNING
			       "N_TXTOFF is not page aligned. Please convert "
			       "library: %s\n",
			       file->f_path.dentry->d_name.name);
			error_time = jiffies;
		}
#endif
		down_write(&current->mm->mmap_sem);
		do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
		up_write(&current->mm->mmap_sem);

		file->f_op->read(file, (char __user *)start_addr,
			ex.a_text + ex.a_data, &pos);
		flush_icache_range((unsigned long) start_addr,
				   (unsigned long) start_addr + ex.a_text +
				   ex.a_data);

		retval = 0;
		goto out;
	}
	/* Now use mmap to map the library into memory. */
	down_write(&current->mm->mmap_sem);
	error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
			PROT_READ | PROT_WRITE | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
			N_TXTOFF(ex));
	up_write(&current->mm->mmap_sem);
	retval = error;
	if (error != start_addr)
		goto out;

	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	bss = ex.a_text + ex.a_data + ex.a_bss;
	if (bss > len) {
		down_write(&current->mm->mmap_sem);
		error = do_brk(start_addr + len, bss - len);
		up_write(&current->mm->mmap_sem);
		retval = error;
		if (error != start_addr + len)
			goto out;
	}
	retval = 0;
out:
	return retval;
}

static int __init init_aout_binfmt(void)
{
	return register_binfmt(&aout_format);
}

static void __exit exit_aout_binfmt(void)
{
	unregister_binfmt(&aout_format);
}

module_init(init_aout_binfmt);
module_exit(exit_aout_binfmt);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* a.out loader for x86-64
	3	*
	4	* Copyright (C) 1991, 1992, 1996 Linus Torvalds
	5	* Hacked together by Andi Kleen
	6	*/
	7
	8	#include <linux/module.h>
	9
	10	#include <linux/time.h>
	11	#include <linux/kernel.h>
	12	#include <linux/mm.h>
	13	#include <linux/mman.h>
	14	#include <linux/a.out.h>
	15	#include <linux/errno.h>
	16	#include <linux/signal.h>
	17	#include <linux/string.h>
	18	#include <linux/fs.h>
	19	#include <linux/file.h>
	20	#include <linux/stat.h>
	21	#include <linux/fcntl.h>
	22	#include <linux/ptrace.h>
	23	#include <linux/user.h>
	24	#include <linux/slab.h>
	25	#include <linux/binfmts.h>
	26	#include <linux/personality.h>
	27	#include <linux/init.h>
	28
	29	#include <asm/system.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/pgalloc.h>
	32	#include <asm/cacheflush.h>
	33	#include <asm/user32.h>
	34	#include <asm/ia32.h>
	35
	36	#undef WARN_OLD
	37	#undef CORE_DUMP /* probably broken */
	38
8edf8bee TG	39	static int load_aout_binary(struct linux_binprm , struct pt_regs regs);
8edf8bee TG	40	static int load_aout_library(struct file *);
1da177e4	41
44456d37	42	#ifdef CORE_DUMP
8edf8bee TG	43	static int aout_core_dump(long signr, struct pt_regs regs, struct file file,
8edf8bee TG	44	unsigned long limit);
1da177e4 LT	45
	46	/*
	47	* fill in the user structure for a core dump..
	48	*/
8edf8bee	49	static void dump_thread32(struct pt_regs regs, struct user32 dump)
1da177e4	50	{
8edf8bee	51	u32 fs, gs;
1da177e4 LT	52
	53	/* changed the size calculations - should hopefully work better. lbt */
	54	dump->magic = CMAGIC;
	55	dump->start_code = 0;
65ea5b03	56	dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
1da177e4	57	dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
8edf8bee TG	58	dump->u_dsize = ((unsigned long)
8edf8bee TG	59	(current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
1da177e4 LT	60	dump->u_dsize -= dump->u_tsize;
1da177e4 LT	61	dump->u_ssize = 0;
8edf8bee TG	62	dump->u_debugreg[0] = current->thread.debugreg0;
	63	dump->u_debugreg[1] = current->thread.debugreg1;
	64	dump->u_debugreg[2] = current->thread.debugreg2;
	65	dump->u_debugreg[3] = current->thread.debugreg3;
	66	dump->u_debugreg[4] = 0;
	67	dump->u_debugreg[5] = 0;
	68	dump->u_debugreg[6] = current->thread.debugreg6;
	69	dump->u_debugreg[7] = current->thread.debugreg7;
	70
	71	if (dump->start_stack < 0xc0000000) {
	72	unsigned long tmp;
	73
	74	tmp = (unsigned long) (0xc0000000 - dump->start_stack);
	75	dump->u_ssize = tmp >> PAGE_SHIFT;
	76	}
1da177e4	77
65ea5b03 PA	78	dump->regs.bx = regs->bx;
	79	dump->regs.cx = regs->cx;
	80	dump->regs.dx = regs->dx;
	81	dump->regs.si = regs->si;
	82	dump->regs.di = regs->di;
	83	dump->regs.bp = regs->bp;
	84	dump->regs.ax = regs->ax;
1da177e4 LT	85	dump->regs.ds = current->thread.ds;
	86	dump->regs.es = current->thread.es;
	87	asm("movl %%fs,%0" : "=r" (fs)); dump->regs.fs = fs;
8edf8bee	88	asm("movl %%gs,%0" : "=r" (gs)); dump->regs.gs = gs;
65ea5b03 PA	89	dump->regs.orig_ax = regs->orig_ax;
65ea5b03 PA	90	dump->regs.ip = regs->ip;
1da177e4	91	dump->regs.cs = regs->cs;
65ea5b03 PA	92	dump->regs.flags = regs->flags;
65ea5b03 PA	93	dump->regs.sp = regs->sp;
1da177e4 LT	94	dump->regs.ss = regs->ss;
	95
	96	#if 1 /* FIXME */
	97	dump->u_fpvalid = 0;
	98	#else
8edf8bee	99	dump->u_fpvalid = dump_fpu(regs, &dump->i387);
1da177e4 LT	100	#endif
	101	}
	102
	103	#endif
	104
	105	static struct linux_binfmt aout_format = {
	106	.module = THIS_MODULE,
	107	.load_binary = load_aout_binary,
	108	.load_shlib = load_aout_library,
44456d37	109	#ifdef CORE_DUMP
1da177e4 LT	110	.core_dump = aout_core_dump,
	111	#endif
	112	.min_coredump = PAGE_SIZE
	113	};
	114
	115	static void set_brk(unsigned long start, unsigned long end)
	116	{
	117	start = PAGE_ALIGN(start);
	118	end = PAGE_ALIGN(end);
	119	if (end <= start)
	120	return;
	121	down_write(&current->mm->mmap_sem);
	122	do_brk(start, end - start);
	123	up_write(&current->mm->mmap_sem);
	124	}
	125
44456d37	126	#ifdef CORE_DUMP
1da177e4 LT	127	/*
	128	* These are the only things you should do on a core-file: use only these
	129	* macros to write out all the necessary info.
	130	*/
	131
	132	static int dump_write(struct file file, const void addr, int nr)
	133	{
	134	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
	135	}
	136
8edf8bee	137	#define DUMP_WRITE(addr, nr) \
1da177e4 LT	138	if (!dump_write(file, (void *)(addr), (nr))) \
	139	goto end_coredump;
	140
8edf8bee TG	141	#define DUMP_SEEK(offset) \
	142	if (file->f_op->llseek) { \
	143	if (file->f_op->llseek(file, (offset), 0) != (offset)) \
	144	goto end_coredump; \
	145	} else \
	146	file->f_pos = (offset)
	147
	148	#define START_DATA() (u.u_tsize << PAGE_SHIFT)
	149	#define START_STACK(u) (u.start_stack)
1da177e4 LT	150
	151	/*
	152	* Routine writes a core dump image in the current directory.
	153	* Currently only a stub-function.
	154	*
	155	* Note that setuid/setgid files won't make a core-dump if the uid/gid
	156	* changed due to the set[u\|g]id. It's enforced by the "current->mm->dumpable"
	157	* field, which also makes sure the core-dumps won't be recursive if the
	158	* dumping of the process results in another error..
	159	*/
	160
8edf8bee TG	161	static int aout_core_dump(long signr, struct pt_regs regs, struct file file,
8edf8bee TG	162	unsigned long limit)
1da177e4 LT	163	{
	164	mm_segment_t fs;
	165	int has_dumped = 0;
	166	unsigned long dump_start, dump_size;
	167	struct user32 dump;
1da177e4 LT	168
	169	fs = get_fs();
	170	set_fs(KERNEL_DS);
	171	has_dumped = 1;
	172	current->flags \|= PF_DUMPCORE;
8edf8bee TG	173	strncpy(dump.u_comm, current->comm, sizeof(current->comm));
	174	dump.u_ar0 = (u32)(((unsigned long)(&dump.regs)) -
	175	((unsigned long)(&dump)));
1da177e4 LT	176	dump.signal = signr;
	177	dump_thread32(regs, &dump);
	178
8edf8bee TG	179	/*
	180	* If the size of the dump file exceeds the rlimit, then see
	181	* what would happen if we wrote the stack, but not the data
	182	* area.
	183	*/
7dc0b22e	184	if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit)
1da177e4 LT	185	dump.u_dsize = 0;
1da177e4 LT	186
8edf8bee	187	/* Make sure we have enough room to write the stack and data areas. */
7dc0b22e	188	if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
1da177e4 LT	189	dump.u_ssize = 0;
1da177e4 LT	190
8edf8bee	191	/* make sure we actually have a data and stack area to dump */
1da177e4	192	set_fs(USER_DS);
8edf8bee TG	193	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
8edf8bee TG	194	dump.u_dsize << PAGE_SHIFT))
1da177e4	195	dump.u_dsize = 0;
8edf8bee TG	196	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
8edf8bee TG	197	dump.u_ssize << PAGE_SHIFT))
1da177e4 LT	198	dump.u_ssize = 0;
	199
	200	set_fs(KERNEL_DS);
8edf8bee TG	201	/* struct user */
	202	DUMP_WRITE(&dump, sizeof(dump));
	203	/* Now dump all of the user data. Include malloced stuff as well */
1da177e4	204	DUMP_SEEK(PAGE_SIZE);
8edf8bee	205	/* now we start writing out the user space info */
1da177e4	206	set_fs(USER_DS);
8edf8bee	207	/* Dump the data area */
1da177e4 LT	208	if (dump.u_dsize != 0) {
	209	dump_start = START_DATA(dump);
	210	dump_size = dump.u_dsize << PAGE_SHIFT;
8edf8bee	211	DUMP_WRITE(dump_start, dump_size);
1da177e4	212	}
8edf8bee	213	/* Now prepare to dump the stack area */
1da177e4 LT	214	if (dump.u_ssize != 0) {
	215	dump_start = START_STACK(dump);
	216	dump_size = dump.u_ssize << PAGE_SHIFT;
8edf8bee	217	DUMP_WRITE(dump_start, dump_size);
1da177e4	218	}
8edf8bee TG	219	/*
	220	* Finally dump the task struct. Not be used by gdb, but
	221	* could be useful
	222	*/
1da177e4	223	set_fs(KERNEL_DS);
8edf8bee	224	DUMP_WRITE(current, sizeof(*current));
1da177e4 LT	225	end_coredump:
	226	set_fs(fs);
	227	return has_dumped;
	228	}
	229	#endif
	230
	231	/*
	232	* create_aout_tables() parses the env- and arg-strings in new user
	233	* memory and creates the pointer tables from them, and puts their
	234	* addresses on the "stack", returning the new stack pointer value.
	235	*/
	236	static u32 __user create_aout_tables(char __user p, struct linux_binprm *bprm)
	237	{
8edf8bee TG	238	u32 __user argv, envp, *sp;
8edf8bee TG	239	int argc = bprm->argc, envc = bprm->envc;
1da177e4 LT	240
	241	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
	242	sp -= envc+1;
	243	envp = sp;
	244	sp -= argc+1;
	245	argv = sp;
8edf8bee TG	246	put_user((unsigned long) envp, --sp);
	247	put_user((unsigned long) argv, --sp);
	248	put_user(argc, --sp);
1da177e4	249	current->mm->arg_start = (unsigned long) p;
8edf8bee	250	while (argc-- > 0) {
1da177e4	251	char c;
8edf8bee TG	252
8edf8bee TG	253	put_user((u32)(unsigned long)p, argv++);
1da177e4	254	do {
8edf8bee	255	get_user(c, p++);
1da177e4 LT	256	} while (c);
1da177e4 LT	257	}
74019699	258	put_user(0, argv);
1da177e4	259	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
8edf8bee	260	while (envc-- > 0) {
1da177e4	261	char c;
8edf8bee TG	262
8edf8bee TG	263	put_user((u32)(unsigned long)p, envp++);
1da177e4	264	do {
8edf8bee	265	get_user(c, p++);
1da177e4 LT	266	} while (c);
1da177e4 LT	267	}
74019699	268	put_user(0, envp);
1da177e4 LT	269	current->mm->env_end = (unsigned long) p;
	270	return sp;
	271	}
	272
	273	/*
	274	* These are the functions used to load a.out style executables and shared
	275	* libraries. There is no binary dependent code anywhere else.
	276	*/
8edf8bee	277	static int load_aout_binary(struct linux_binprm bprm, struct pt_regs regs)
1da177e4	278	{
8edf8bee	279	unsigned long error, fd_offset, rlim;
1da177e4	280	struct exec ex;
1da177e4 LT	281	int retval;
	282
	283	ex = ((struct exec ) bprm->buf); /* exec-header */
	284	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	285	N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) \|\|
	286	N_TRSIZE(ex) \|\| N_DRSIZE(ex) \|\|
8edf8bee TG	287	i_size_read(bprm->file->f_path.dentry->d_inode) <
8edf8bee TG	288	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	289	return -ENOEXEC;
	290	}
	291
	292	fd_offset = N_TXTOFF(ex);
	293
	294	/* Check initial limits. This avoids letting people circumvent
	295	* size limits imposed on them by creating programs with large
	296	* arrays in the data or bss.
	297	*/
	298	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
	299	if (rlim >= RLIM_INFINITY)
	300	rlim = ~0;
	301	if (ex.a_data + ex.a_bss > rlim)
	302	return -ENOMEM;
	303
	304	/* Flush all traces of the currently running executable */
	305	retval = flush_old_exec(bprm);
	306	if (retval)
	307	return retval;
	308
8edf8bee	309	regs->cs = __USER32_CS;
1da177e4 LT	310	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
	311	regs->r13 = regs->r14 = regs->r15 = 0;
	312
	313	/* OK, This is the point of no return */
	314	set_personality(PER_LINUX);
8edf8bee	315	set_thread_flag(TIF_IA32);
1da177e4 LT	316	clear_thread_flag(TIF_ABI_PENDING);
	317
	318	current->mm->end_code = ex.a_text +
	319	(current->mm->start_code = N_TXTADDR(ex));
	320	current->mm->end_data = ex.a_data +
	321	(current->mm->start_data = N_DATADDR(ex));
	322	current->mm->brk = ex.a_bss +
	323	(current->mm->start_brk = N_BSSADDR(ex));
	324	current->mm->free_area_cache = TASK_UNMAPPED_BASE;
1363c3cd	325	current->mm->cached_hole_size = 0;
1da177e4	326
1da177e4 LT	327	current->mm->mmap = NULL;
1da177e4 LT	328	compute_creds(bprm);
8edf8bee	329	current->flags &= ~PF_FORKNOEXEC;
1da177e4 LT	330
	331	if (N_MAGIC(ex) == OMAGIC) {
	332	unsigned long text_addr, map_size;
	333	loff_t pos;
	334
	335	text_addr = N_TXTADDR(ex);
	336
	337	pos = 32;
	338	map_size = ex.a_text+ex.a_data;
	339
	340	down_write(&current->mm->mmap_sem);
	341	error = do_brk(text_addr & PAGE_MASK, map_size);
	342	up_write(&current->mm->mmap_sem);
	343
	344	if (error != (text_addr & PAGE_MASK)) {
	345	send_sig(SIGKILL, current, 0);
	346	return error;
	347	}
	348
52d522f5 AK	349	error = bprm->file->f_op->read(bprm->file,
52d522f5 AK	350	(char __user *)text_addr,
1da177e4 LT	351	ex.a_text+ex.a_data, &pos);
	352	if ((signed long)error < 0) {
	353	send_sig(SIGKILL, current, 0);
	354	return error;
	355	}
8edf8bee	356
1da177e4 LT	357	flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
	358	} else {
	359	#ifdef WARN_OLD
	360	static unsigned long error_time, error_time2;
	361	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
8edf8bee	362	(N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ) {
1da177e4 LT	363	printk(KERN_NOTICE "executable not page aligned\n");
	364	error_time2 = jiffies;
	365	}
	366
	367	if ((fd_offset & ~PAGE_MASK) != 0 &&
8edf8bee TG	368	(jiffies - error_time) > 5*HZ) {
	369	printk(KERN_WARNING
	370	"fd_offset is not page aligned. Please convert "
	371	"program: %s\n",
c941192a	372	bprm->file->f_path.dentry->d_name.name);
1da177e4 LT	373	error_time = jiffies;
	374	}
	375	#endif
	376
8edf8bee	377	if (!bprm->file->f_op->mmap \|\| (fd_offset & ~PAGE_MASK) != 0) {
1da177e4	378	loff_t pos = fd_offset;
8edf8bee	379
1da177e4 LT	380	down_write(&current->mm->mmap_sem);
	381	do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
	382	up_write(&current->mm->mmap_sem);
52d522f5 AK	383	bprm->file->f_op->read(bprm->file,
52d522f5 AK	384	(char __user *)N_TXTADDR(ex),
1da177e4 LT	385	ex.a_text+ex.a_data, &pos);
	386	flush_icache_range((unsigned long) N_TXTADDR(ex),
	387	(unsigned long) N_TXTADDR(ex) +
	388	ex.a_text+ex.a_data);
	389	goto beyond_if;
	390	}
	391
	392	down_write(&current->mm->mmap_sem);
	393	error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
8edf8bee TG	394	PROT_READ \| PROT_EXEC,
	395	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
	396	MAP_EXECUTABLE \| MAP_32BIT,
	397	fd_offset);
1da177e4 LT	398	up_write(&current->mm->mmap_sem);
	399
	400	if (error != N_TXTADDR(ex)) {
	401	send_sig(SIGKILL, current, 0);
	402	return error;
	403	}
	404
	405	down_write(&current->mm->mmap_sem);
8edf8bee	406	error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
1da177e4	407	PROT_READ \| PROT_WRITE \| PROT_EXEC,
8edf8bee TG	408	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
8edf8bee TG	409	MAP_EXECUTABLE \| MAP_32BIT,
1da177e4 LT	410	fd_offset + ex.a_text);
	411	up_write(&current->mm->mmap_sem);
	412	if (error != N_DATADDR(ex)) {
	413	send_sig(SIGKILL, current, 0);
	414	return error;
	415	}
	416	}
	417	beyond_if:
	418	set_binfmt(&aout_format);
	419
	420	set_brk(current->mm->start_brk, current->mm->brk);
	421
b6a2fea3	422	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
8edf8bee TG	423	if (retval < 0) {
	424	/* Someone check-me: is this error path enough? */
	425	send_sig(SIGKILL, current, 0);
1da177e4 LT	426	return retval;
	427	}
	428
	429	current->mm->start_stack =
	430	(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	431	/* start thread */
	432	asm volatile("movl %0,%%fs" :: "r" (0)); \
	433	asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS));
8edf8bee	434	load_gs_index(0);
65ea5b03 PA	435	(regs)->ip = ex.a_entry;
	436	(regs)->sp = current->mm->start_stack;
	437	(regs)->flags = 0x200;
1da177e4 LT	438	(regs)->cs = __USER32_CS;
1da177e4 LT	439	(regs)->ss = __USER32_DS;
f891dd18 AK	440	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
f891dd18 AK	441	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
1da177e4 LT	442	set_fs(USER_DS);
	443	if (unlikely(current->ptrace & PT_PTRACED)) {
	444	if (current->ptrace & PT_TRACE_EXEC)
8edf8bee	445	ptrace_notify((PTRACE_EVENT_EXEC << 8) \| SIGTRAP);
1da177e4 LT	446	else
	447	send_sig(SIGTRAP, current, 0);
	448	}
	449	return 0;
	450	}
	451
	452	static int load_aout_library(struct file *file)
	453	{
8edf8bee TG	454	struct inode *inode;
8edf8bee TG	455	unsigned long bss, start_addr, len, error;
1da177e4 LT	456	int retval;
	457	struct exec ex;
	458
c941192a	459	inode = file->f_path.dentry->d_inode;
1da177e4 LT	460
	461	retval = -ENOEXEC;
	462	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
	463	if (error != sizeof(ex))
	464	goto out;
	465
	466	/* We come in here for the regular a.out style of shared libraries */
	467	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	468	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
8edf8bee TG	469	i_size_read(inode) <
8edf8bee TG	470	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	471	goto out;
	472	}
	473
	474	if (N_FLAGS(ex))
	475	goto out;
	476
	477	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	478	this off to get the starting address for the page */
	479
	480	start_addr = ex.a_entry & 0xfffff000;
	481
	482	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
	483	loff_t pos = N_TXTOFF(ex);
	484
	485	#ifdef WARN_OLD
	486	static unsigned long error_time;
8edf8bee TG	487	if ((jiffies-error_time) > 5*HZ) {
	488	printk(KERN_WARNING
	489	"N_TXTOFF is not page aligned. Please convert "
	490	"library: %s\n",
c941192a	491	file->f_path.dentry->d_name.name);
1da177e4 LT	492	error_time = jiffies;
	493	}
	494	#endif
	495	down_write(&current->mm->mmap_sem);
	496	do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
	497	up_write(&current->mm->mmap_sem);
8edf8bee	498
52d522f5	499	file->f_op->read(file, (char __user *)start_addr,
1da177e4 LT	500	ex.a_text + ex.a_data, &pos);
1da177e4 LT	501	flush_icache_range((unsigned long) start_addr,
8edf8bee TG	502	(unsigned long) start_addr + ex.a_text +
8edf8bee TG	503	ex.a_data);
1da177e4 LT	504
	505	retval = 0;
	506	goto out;
	507	}
	508	/* Now use mmap to map the library into memory. */
	509	down_write(&current->mm->mmap_sem);
	510	error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
	511	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	512	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_32BIT,
	513	N_TXTOFF(ex));
	514	up_write(&current->mm->mmap_sem);
	515	retval = error;
	516	if (error != start_addr)
	517	goto out;
	518
	519	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	520	bss = ex.a_text + ex.a_data + ex.a_bss;
	521	if (bss > len) {
	522	down_write(&current->mm->mmap_sem);
	523	error = do_brk(start_addr + len, bss - len);
	524	up_write(&current->mm->mmap_sem);
	525	retval = error;
	526	if (error != start_addr + len)
	527	goto out;
	528	}
	529	retval = 0;
	530	out:
	531	return retval;
	532	}
	533
	534	static int __init init_aout_binfmt(void)
	535	{
	536	return register_binfmt(&aout_format);
	537	}
	538
	539	static void __exit exit_aout_binfmt(void)
	540	{
	541	unregister_binfmt(&aout_format);
	542	}
	543
	544	module_init(init_aout_binfmt);
	545	module_exit(exit_aout_binfmt);
	546	MODULE_LICENSE("GPL");