[net-next-2.6.git] / fs / binfmt_aout.c

/*
 *  linux/fs/binfmt_aout.c
 *
 *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
 */

#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/cacheflush.h>
#include <asm/a.out-core.h>

static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
static int load_aout_library(struct file*);
static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);

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

#define BAD_ADDR(x)	((unsigned long)(x) >= TASK_SIZE)

static int set_brk(unsigned long start, unsigned long end)
{
	start = PAGE_ALIGN(start);
	end = PAGE_ALIGN(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;
	}
	return 0;
}

/*
 * 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)

/*
 * 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 user dump;
#if defined(__alpha__)
#       define START_DATA(u)	(u.start_data)
#elif defined(__arm__)
#	define START_DATA(u)	((u.u_tsize << PAGE_SHIFT) + u.start_code)
#elif defined(__sparc__)
#       define START_DATA(u)    (u.u_tsize)
#elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__)
#       define START_DATA(u)	(u.u_tsize << PAGE_SHIFT)
#endif
#ifdef __sparc__
#       define START_STACK(u)   ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
#else
#       define START_STACK(u)   (u.start_stack)
#endif

	fs = get_fs();
	set_fs(KERNEL_DS);
	has_dumped = 1;
	current->flags |= PF_DUMPCORE;
       	strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
#ifndef __sparc__
	dump.u_ar0 = offsetof(struct user, regs);
#endif
	dump.signal = signr;
	aout_dump_thread(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.  */
#ifdef __sparc__
	if ((dump.u_dsize + dump.u_ssize) > limit)
		dump.u_dsize = 0;
#else
	if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > limit)
		dump.u_dsize = 0;
#endif

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

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

	set_fs(KERNEL_DS);
/* struct user */
	DUMP_WRITE(&dump,sizeof(dump));
/* Now dump all of the user data.  Include malloced stuff as well */
#ifndef __sparc__
	DUMP_SEEK(PAGE_SIZE);
#endif
/* 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);
#ifdef __sparc__
		dump_size = dump.u_dsize;
#else
		dump_size = dump.u_dsize << PAGE_SHIFT;
#endif
		DUMP_WRITE(dump_start,dump_size);
	}
/* Now prepare to dump the stack area */
	if (dump.u_ssize != 0) {
		dump_start = START_STACK(dump);
#ifdef __sparc__
		dump_size = dump.u_ssize;
#else
		dump_size = dump.u_ssize << PAGE_SHIFT;
#endif
		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;
}

/*
 * 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 unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
{
	char __user * __user *argv;
	char __user * __user *envp;
	unsigned long __user *sp;
	int argc = bprm->argc;
	int envc = bprm->envc;

	sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
#ifdef __sparc__
	/* This imposes the proper stack alignment for a new process. */
	sp = (void __user *) (((unsigned long) sp) & ~7);
	if ((envc+argc+3)&1) --sp;
#endif
#ifdef __alpha__
/* whee.. test-programs are so much fun. */
	put_user(0, --sp);
	put_user(0, --sp);
	if (bprm->loader) {
		put_user(0, --sp);
		put_user(0x3eb, --sp);
		put_user(bprm->loader, --sp);
		put_user(0x3ea, --sp);
	}
	put_user(bprm->exec, --sp);
	put_user(0x3e9, --sp);
#endif
	sp -= envc+1;
	envp = (char __user * __user *) sp;
	sp -= argc+1;
	argv = (char __user * __user *) sp;
#if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__)
	put_user((unsigned long) envp,--sp);
	put_user((unsigned long) argv,--sp);
#endif
	put_user(argc,--sp);
	current->mm->arg_start = (unsigned long) p;
	while (argc-->0) {
		char c;
		put_user(p,argv++);
		do {
			get_user(c,p++);
		} while (c);
	}
	put_user(NULL,argv);
	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
	while (envc-->0) {
		char c;
		put_user(p,envp++);
		do {
			get_user(c,p++);
		} while (c);
	}
	put_user(NULL,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)
{
	struct exec ex;
	unsigned long error;
	unsigned long fd_offset;
	unsigned long rlim;
	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;
	}

	/*
	 * Requires a mmap handler. This prevents people from using a.out
	 * as part of an exploit attack against /proc-related vulnerabilities.
	 */
	if (!bprm->file->f_op || !bprm->file->f_op->mmap)
		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;

	/* OK, This is the point of no return */
#if defined(__alpha__)
	SET_AOUT_PERSONALITY(bprm, ex);
#elif defined(__sparc__)
	set_personality(PER_SUNOS);
#if !defined(__sparc_v9__)
	memcpy(&current->thread.core_exec, &ex, sizeof(struct exec));
#endif
#else
	set_personality(PER_LINUX);
#endif

	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 = current->mm->mmap_base;
	current->mm->cached_hole_size = 0;

	install_exec_creds(bprm);
 	current->flags &= ~PF_FORKNOEXEC;
#ifdef __sparc__
	if (N_MAGIC(ex) == NMAGIC) {
		loff_t pos = fd_offset;
		/* Fuck me plenty... */
		/* <AOL></AOL> */
		down_write(&current->mm->mmap_sem);	
		error = do_brk(N_TXTADDR(ex), ex.a_text);
		up_write(&current->mm->mmap_sem);
		bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
			  ex.a_text, &pos);
		down_write(&current->mm->mmap_sem);
		error = do_brk(N_DATADDR(ex), ex.a_data);
		up_write(&current->mm->mmap_sem);
		bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
			  ex.a_data, &pos);
		goto beyond_if;
	}
#endif

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

		text_addr = N_TXTADDR(ex);

#if defined(__alpha__) || defined(__sparc__)
		pos = fd_offset;
		map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
#else
		pos = 32;
		map_size = ex.a_text+ex.a_data;
#endif
		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 {
		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
		    (N_MAGIC(ex) != NMAGIC) && printk_ratelimit())
		{
			printk(KERN_NOTICE "executable not page aligned\n");
		}

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

		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,
			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,
				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);

	retval = set_brk(current->mm->start_brk, current->mm->brk);
	if (retval < 0) {
		send_sig(SIGKILL, current, 0);
		return retval;
	}

	retval = setup_arg_pages(bprm, 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);
#ifdef __alpha__
	regs->gp = ex.a_gpvalue;
#endif
	start_thread(regs, ex.a_entry, current->mm->start_stack);
	return 0;
}

static int load_aout_library(struct file *file)
{
	struct inode * inode;
	unsigned long bss, start_addr, len;
	unsigned long 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;
	}

	/*
	 * Requires a mmap handler. This prevents people from using a.out
	 * as part of an exploit attack against /proc-related vulnerabilities.
	 */
	if (!file->f_op || !file->f_op->mmap)
		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);

		if (printk_ratelimit())
		{
			printk(KERN_WARNING 
			       "N_TXTOFF is not page aligned. Please convert library: %s\n",
			       file->f_path.dentry->d_name.name);
		}
		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,
			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);
}

core_initcall(init_aout_binfmt);
module_exit(exit_aout_binfmt);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/binfmt_aout.c
	3	*
	4	* Copyright (C) 1991, 1992, 1996 Linus Torvalds
	5	*/
	6
	7	#include <linux/module.h>
	8
	9	#include <linux/time.h>
	10	#include <linux/kernel.h>
	11	#include <linux/mm.h>
	12	#include <linux/mman.h>
	13	#include <linux/a.out.h>
	14	#include <linux/errno.h>
	15	#include <linux/signal.h>
	16	#include <linux/string.h>
	17	#include <linux/fs.h>
	18	#include <linux/file.h>
	19	#include <linux/stat.h>
	20	#include <linux/fcntl.h>
	21	#include <linux/ptrace.h>
	22	#include <linux/user.h>
	23	#include <linux/slab.h>
	24	#include <linux/binfmts.h>
	25	#include <linux/personality.h>
	26	#include <linux/init.h>
	27
	28	#include <asm/system.h>
	29	#include <asm/uaccess.h>
	30	#include <asm/cacheflush.h>
7fa30315	31	#include <asm/a.out-core.h>
1da177e4 LT	32
	33	static int load_aout_binary(struct linux_binprm , struct pt_regs regs);
	34	static int load_aout_library(struct file*);
7dc0b22e	35	static int aout_core_dump(long signr, struct pt_regs regs, struct file file, unsigned long limit);
1da177e4	36
1da177e4 LT	37	static struct linux_binfmt aout_format = {
	38	.module = THIS_MODULE,
	39	.load_binary = load_aout_binary,
	40	.load_shlib = load_aout_library,
	41	.core_dump = aout_core_dump,
	42	.min_coredump = PAGE_SIZE
	43	};
	44
	45	#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
	46
	47	static int set_brk(unsigned long start, unsigned long end)
	48	{
	49	start = PAGE_ALIGN(start);
	50	end = PAGE_ALIGN(end);
	51	if (end > start) {
	52	unsigned long addr;
	53	down_write(&current->mm->mmap_sem);
	54	addr = do_brk(start, end - start);
	55	up_write(&current->mm->mmap_sem);
	56	if (BAD_ADDR(addr))
	57	return addr;
	58	}
	59	return 0;
	60	}
	61
	62	/*
	63	* These are the only things you should do on a core-file: use only these
	64	* macros to write out all the necessary info.
	65	*/
	66
	67	static int dump_write(struct file file, const void addr, int nr)
	68	{
	69	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
	70	}
	71
	72	#define DUMP_WRITE(addr, nr) \
	73	if (!dump_write(file, (void *)(addr), (nr))) \
	74	goto end_coredump;
	75
	76	#define DUMP_SEEK(offset) \
	77	if (file->f_op->llseek) { \
	78	if (file->f_op->llseek(file,(offset),0) != (offset)) \
	79	goto end_coredump; \
	80	} else file->f_pos = (offset)
	81
	82	/*
	83	* Routine writes a core dump image in the current directory.
	84	* Currently only a stub-function.
	85	*
	86	* Note that setuid/setgid files won't make a core-dump if the uid/gid
	87	* changed due to the set[u\|g]id. It's enforced by the "current->mm->dumpable"
	88	* field, which also makes sure the core-dumps won't be recursive if the
	89	* dumping of the process results in another error..
	90	*/
	91
7dc0b22e	92	static int aout_core_dump(long signr, struct pt_regs regs, struct file file, unsigned long limit)
1da177e4 LT	93	{
	94	mm_segment_t fs;
	95	int has_dumped = 0;
	96	unsigned long dump_start, dump_size;
	97	struct user dump;
	98	#if defined(__alpha__)
	99	# define START_DATA(u) (u.start_data)
	100	#elif defined(__arm__)
	101	# define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code)
	102	#elif defined(__sparc__)
	103	# define START_DATA(u) (u.u_tsize)
	104	#elif defined(__i386__) \|\| defined(__mc68000__) \|\| defined(__arch_um__)
	105	# define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
	106	#endif
	107	#ifdef __sparc__
	108	# define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
	109	#else
	110	# define START_STACK(u) (u.start_stack)
	111	#endif
	112
	113	fs = get_fs();
	114	set_fs(KERNEL_DS);
	115	has_dumped = 1;
	116	current->flags \|= PF_DUMPCORE;
	117	strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
	118	#ifndef __sparc__
6e16d89b	119	dump.u_ar0 = offsetof(struct user, regs);
1da177e4 LT	120	#endif
1da177e4 LT	121	dump.signal = signr;
7fa30315	122	aout_dump_thread(regs, &dump);
1da177e4 LT	123
	124	/* If the size of the dump file exceeds the rlimit, then see what would happen
	125	if we wrote the stack, but not the data area. */
	126	#ifdef __sparc__
7dc0b22e	127	if ((dump.u_dsize + dump.u_ssize) > limit)
1da177e4 LT	128	dump.u_dsize = 0;
1da177e4 LT	129	#else
7dc0b22e	130	if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > limit)
1da177e4 LT	131	dump.u_dsize = 0;
	132	#endif
	133
	134	/* Make sure we have enough room to write the stack and data areas. */
	135	#ifdef __sparc__
7dc0b22e	136	if (dump.u_ssize > limit)
1da177e4 LT	137	dump.u_ssize = 0;
1da177e4 LT	138	#else
7dc0b22e	139	if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
1da177e4 LT	140	dump.u_ssize = 0;
	141	#endif
	142
	143	/* make sure we actually have a data and stack area to dump */
	144	set_fs(USER_DS);
	145	#ifdef __sparc__
	146	if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize))
	147	dump.u_dsize = 0;
	148	if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize))
	149	dump.u_ssize = 0;
	150	#else
	151	if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
	152	dump.u_dsize = 0;
	153	if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
	154	dump.u_ssize = 0;
	155	#endif
	156
	157	set_fs(KERNEL_DS);
	158	/* struct user */
	159	DUMP_WRITE(&dump,sizeof(dump));
	160	/* Now dump all of the user data. Include malloced stuff as well */
	161	#ifndef __sparc__
	162	DUMP_SEEK(PAGE_SIZE);
	163	#endif
	164	/* now we start writing out the user space info */
	165	set_fs(USER_DS);
	166	/* Dump the data area */
	167	if (dump.u_dsize != 0) {
	168	dump_start = START_DATA(dump);
	169	#ifdef __sparc__
	170	dump_size = dump.u_dsize;
	171	#else
	172	dump_size = dump.u_dsize << PAGE_SHIFT;
	173	#endif
	174	DUMP_WRITE(dump_start,dump_size);
	175	}
	176	/* Now prepare to dump the stack area */
	177	if (dump.u_ssize != 0) {
	178	dump_start = START_STACK(dump);
	179	#ifdef __sparc__
	180	dump_size = dump.u_ssize;
	181	#else
	182	dump_size = dump.u_ssize << PAGE_SHIFT;
	183	#endif
	184	DUMP_WRITE(dump_start,dump_size);
	185	}
	186	/* Finally dump the task struct. Not be used by gdb, but could be useful */
	187	set_fs(KERNEL_DS);
	188	DUMP_WRITE(current,sizeof(*current));
	189	end_coredump:
	190	set_fs(fs);
	191	return has_dumped;
	192	}
	193
	194	/*
	195	* create_aout_tables() parses the env- and arg-strings in new user
	196	* memory and creates the pointer tables from them, and puts their
	197	* addresses on the "stack", returning the new stack pointer value.
	198	*/
	199	static unsigned long __user create_aout_tables(char __user p, struct linux_binprm * bprm)
	200	{
	201	char __user * __user *argv;
	202	char __user * __user *envp;
	203	unsigned long __user *sp;
204	int argc = bprm->argc;
205	int envc = bprm->envc;
206
207	sp = (void __user )((-(unsigned long)sizeof(char )) & (unsigned long) p);
208	#ifdef __sparc__
209	/* This imposes the proper stack alignment for a new process. */
210	sp = (void __user *) (((unsigned long) sp) & ~7);
211	if ((envc+argc+3)&1) --sp;
212	#endif
213	#ifdef __alpha__
214	/* whee.. test-programs are so much fun. */
215	put_user(0, --sp);
216	put_user(0, --sp);
217	if (bprm->loader) {
218	put_user(0, --sp);
219	put_user(0x3eb, --sp);
220	put_user(bprm->loader, --sp);
221	put_user(0x3ea, --sp);
222	}
223	put_user(bprm->exec, --sp);
224	put_user(0x3e9, --sp);
225	#endif
226	sp -= envc+1;
227	envp = (char __user * __user *) sp;
228	sp -= argc+1;
229	argv = (char __user * __user *) sp;
230	#if defined(__i386__) \|\| defined(__mc68000__) \|\| defined(__arm__) \|\| defined(__arch_um__)
231	put_user((unsigned long) envp,--sp);
232	put_user((unsigned long) argv,--sp);
233	#endif
234	put_user(argc,--sp);
235	current->mm->arg_start = (unsigned long) p;
236	while (argc-->0) {
237	char c;
238	put_user(p,argv++);
239	do {
240	get_user(c,p++);
241	} while (c);
242	}
243	put_user(NULL,argv);
244	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
245	while (envc-->0) {
246	char c;
247	put_user(p,envp++);
248	do {
249	get_user(c,p++);
250	} while (c);
251	}
252	put_user(NULL,envp);
253	current->mm->env_end = (unsigned long) p;
254	return sp;
255	}
256
257	/*
258	* These are the functions used to load a.out style executables and shared
259	* libraries. There is no binary dependent code anywhere else.
260	*/
261
262	static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
263	{
264	struct exec ex;
265	unsigned long error;
266	unsigned long fd_offset;
267	unsigned long rlim;
268	int retval;
269
270	ex = ((struct exec ) bprm->buf); /* exec-header */
271	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
272	N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) \|\|
273	N_TRSIZE(ex) \|\| N_DRSIZE(ex) \|\|
0f7fc9e4	274	i_size_read(bprm->file->f_path.dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	275	return -ENOEXEC;
	276	}
	277
8454aeef ET	278	/*
	279	* Requires a mmap handler. This prevents people from using a.out
	280	* as part of an exploit attack against /proc-related vulnerabilities.
	281	*/
	282	if (!bprm->file->f_op \|\| !bprm->file->f_op->mmap)
	283	return -ENOEXEC;
	284
1da177e4 LT	285	fd_offset = N_TXTOFF(ex);
	286
	287	/* Check initial limits. This avoids letting people circumvent
	288	* size limits imposed on them by creating programs with large
	289	* arrays in the data or bss.
	290	*/
	291	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
	292	if (rlim >= RLIM_INFINITY)
	293	rlim = ~0;
	294	if (ex.a_data + ex.a_bss > rlim)
	295	return -ENOMEM;
	296
	297	/* Flush all traces of the currently running executable */
	298	retval = flush_old_exec(bprm);
	299	if (retval)
	300	return retval;
	301
	302	/* OK, This is the point of no return */
	303	#if defined(__alpha__)
	304	SET_AOUT_PERSONALITY(bprm, ex);
	305	#elif defined(__sparc__)
	306	set_personality(PER_SUNOS);
	307	#if !defined(__sparc_v9__)
	308	memcpy(&current->thread.core_exec, &ex, sizeof(struct exec));
	309	#endif
	310	#else
	311	set_personality(PER_LINUX);
	312	#endif
	313
	314	current->mm->end_code = ex.a_text +
	315	(current->mm->start_code = N_TXTADDR(ex));
	316	current->mm->end_data = ex.a_data +
	317	(current->mm->start_data = N_DATADDR(ex));
	318	current->mm->brk = ex.a_bss +
	319	(current->mm->start_brk = N_BSSADDR(ex));
	320	current->mm->free_area_cache = current->mm->mmap_base;
1363c3cd	321	current->mm->cached_hole_size = 0;
1da177e4	322
a6f76f23	323	install_exec_creds(bprm);
1da177e4 LT	324	current->flags &= ~PF_FORKNOEXEC;
	325	#ifdef __sparc__
	326	if (N_MAGIC(ex) == NMAGIC) {
	327	loff_t pos = fd_offset;
	328	/* Fuck me plenty... */
	329	/* <AOL></AOL> */
	330	down_write(&current->mm->mmap_sem);
	331	error = do_brk(N_TXTADDR(ex), ex.a_text);
	332	up_write(&current->mm->mmap_sem);
	333	bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
	334	ex.a_text, &pos);
	335	down_write(&current->mm->mmap_sem);
	336	error = do_brk(N_DATADDR(ex), ex.a_data);
	337	up_write(&current->mm->mmap_sem);
	338	bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
	339	ex.a_data, &pos);
	340	goto beyond_if;
	341	}
	342	#endif
	343
	344	if (N_MAGIC(ex) == OMAGIC) {
	345	unsigned long text_addr, map_size;
	346	loff_t pos;
	347
	348	text_addr = N_TXTADDR(ex);
	349
	350	#if defined(__alpha__) \|\| defined(__sparc__)
	351	pos = fd_offset;
	352	map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
	353	#else
	354	pos = 32;
	355	map_size = ex.a_text+ex.a_data;
	356	#endif
	357	down_write(&current->mm->mmap_sem);
	358	error = do_brk(text_addr & PAGE_MASK, map_size);
	359	up_write(&current->mm->mmap_sem);
	360	if (error != (text_addr & PAGE_MASK)) {
	361	send_sig(SIGKILL, current, 0);
	362	return error;
	363	}
	364
	365	error = bprm->file->f_op->read(bprm->file,
	366	(char __user *)text_addr,
	367	ex.a_text+ex.a_data, &pos);
	368	if ((signed long)error < 0) {
	369	send_sig(SIGKILL, current, 0);
	370	return error;
	371	}
	372
	373	flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
	374	} else {
1da177e4	375	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
2e50b6cc	376	(N_MAGIC(ex) != NMAGIC) && printk_ratelimit())
1da177e4 LT	377	{
1da177e4 LT	378	printk(KERN_NOTICE "executable not page aligned\n");
1da177e4 LT	379	}
1da177e4 LT	380
2e50b6cc	381	if ((fd_offset & ~PAGE_MASK) != 0 && printk_ratelimit())
1da177e4 LT	382	{
	383	printk(KERN_WARNING
	384	"fd_offset is not page aligned. Please convert program: %s\n",
0f7fc9e4	385	bprm->file->f_path.dentry->d_name.name);
1da177e4 LT	386	}
	387
	388	if (!bprm->file->f_op->mmap\|\|((fd_offset & ~PAGE_MASK) != 0)) {
	389	loff_t pos = fd_offset;
	390	down_write(&current->mm->mmap_sem);
	391	do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
	392	up_write(&current->mm->mmap_sem);
	393	bprm->file->f_op->read(bprm->file,
	394	(char __user *)N_TXTADDR(ex),
	395	ex.a_text+ex.a_data, &pos);
	396	flush_icache_range((unsigned long) N_TXTADDR(ex),
	397	(unsigned long) N_TXTADDR(ex) +
	398	ex.a_text+ex.a_data);
	399	goto beyond_if;
	400	}
	401
	402	down_write(&current->mm->mmap_sem);
	403	error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
	404	PROT_READ \| PROT_EXEC,
	405	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_EXECUTABLE,
	406	fd_offset);
	407	up_write(&current->mm->mmap_sem);
	408
	409	if (error != N_TXTADDR(ex)) {
	410	send_sig(SIGKILL, current, 0);
	411	return error;
	412	}
	413
	414	down_write(&current->mm->mmap_sem);
	415	error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
	416	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	417	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_EXECUTABLE,
	418	fd_offset + ex.a_text);
	419	up_write(&current->mm->mmap_sem);
	420	if (error != N_DATADDR(ex)) {
	421	send_sig(SIGKILL, current, 0);
	422	return error;
	423	}
	424	}
	425	beyond_if:
	426	set_binfmt(&aout_format);
	427
	428	retval = set_brk(current->mm->start_brk, current->mm->brk);
	429	if (retval < 0) {
	430	send_sig(SIGKILL, current, 0);
	431	return retval;
	432	}
	433
	434	retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
	435	if (retval < 0) {
	436	/* Someone check-me: is this error path enough? */
	437	send_sig(SIGKILL, current, 0);
	438	return retval;
	439	}
	440
	441	current->mm->start_stack =
	442	(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
	443	#ifdef __alpha__
	444	regs->gp = ex.a_gpvalue;
	445	#endif
	446	start_thread(regs, ex.a_entry, current->mm->start_stack);
1da177e4 LT	447	return 0;
	448	}
	449
	450	static int load_aout_library(struct file *file)
	451	{
	452	struct inode * inode;
	453	unsigned long bss, start_addr, len;
	454	unsigned long error;
	455	int retval;
	456	struct exec ex;
	457
0f7fc9e4	458	inode = file->f_path.dentry->d_inode;
1da177e4 LT	459
	460	retval = -ENOEXEC;
	461	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
	462	if (error != sizeof(ex))
	463	goto out;
	464
	465	/* We come in here for the regular a.out style of shared libraries */
	466	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	467	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
	468	i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
	469	goto out;
	470	}
	471
8454aeef ET	472	/*
	473	* Requires a mmap handler. This prevents people from using a.out
	474	* as part of an exploit attack against /proc-related vulnerabilities.
	475	*/
	476	if (!file->f_op \|\| !file->f_op->mmap)
	477	goto out;
	478
1da177e4 LT	479	if (N_FLAGS(ex))
	480	goto out;
	481
	482	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	483	this off to get the starting address for the page */
	484
	485	start_addr = ex.a_entry & 0xfffff000;
	486
	487	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
1da177e4 LT	488	loff_t pos = N_TXTOFF(ex);
1da177e4 LT	489
2e50b6cc	490	if (printk_ratelimit())
1da177e4 LT	491	{
	492	printk(KERN_WARNING
	493	"N_TXTOFF is not page aligned. Please convert library: %s\n",
0f7fc9e4	494	file->f_path.dentry->d_name.name);
1da177e4 LT	495	}
	496	down_write(&current->mm->mmap_sem);
	497	do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
	498	up_write(&current->mm->mmap_sem);
	499
	500	file->f_op->read(file, (char __user *)start_addr,
	501	ex.a_text + ex.a_data, &pos);
	502	flush_icache_range((unsigned long) start_addr,
	503	(unsigned long) start_addr + ex.a_text + ex.a_data);
	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,
	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	core_initcall(init_aout_binfmt);
	545	module_exit(exit_aout_binfmt);
	546	MODULE_LICENSE("GPL");