[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/binfmts.h>
#include <linux/personality.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/perf_event.h>

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

#undef WARN_OLD

static int load_aout_binary(struct linux_binprm *);
static int load_aout_library(struct file *);

#ifdef CONFIG_COREDUMP
static int aout_core_dump(struct coredump_params *);

static unsigned long get_dr(int n)
{
	struct perf_event *bp = current->thread.ptrace_bps[n];
	return bp ? bp->hw.info.address : 0;
}

/*
 * fill in the user structure for a core dump..
 */
static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
{
	u32 fs, gs;
	memset(dump, 0, sizeof(*dump));

/* 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_debugreg[0] = get_dr(0);
	dump->u_debugreg[1] = get_dr(1);
	dump->u_debugreg[2] = get_dr(2);
	dump->u_debugreg[3] = get_dr(3);
	dump->u_debugreg[6] = current->thread.debugreg6;
	dump->u_debugreg[7] = current->thread.ptrace_dr7;

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

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

	dump->regs.ebx = regs->bx;
	dump->regs.ecx = regs->cx;
	dump->regs.edx = regs->dx;
	dump->regs.esi = regs->si;
	dump->regs.edi = regs->di;
	dump->regs.ebp = regs->bp;
	dump->regs.eax = regs->ax;
	dump->regs.ds = current->thread.ds;
	dump->regs.es = current->thread.es;
	savesegment(fs, fs);
	dump->regs.fs = fs;
	savesegment(gs, gs);
	dump->regs.gs = gs;
	dump->regs.orig_eax = regs->orig_ax;
	dump->regs.eip = regs->ip;
	dump->regs.cs = regs->cs;
	dump->regs.eflags = regs->flags;
	dump->regs.esp = 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 CONFIG_COREDUMP
	.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;
	vm_brk(start, end - start);
}

#ifdef CONFIG_COREDUMP
/*
 * These are the only things you should do on a core-file: use only these
 * macros to write out all the necessary info.
 */

#include <linux/coredump.h>

#define START_DATA(u)	(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(struct coredump_params *cprm)
{
	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;
	strncpy(dump.u_comm, current->comm, sizeof(current->comm));
	dump.u_ar0 = offsetof(struct user32, regs);
	dump.signal = cprm->siginfo->si_signo;
	dump_thread32(cprm->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 > cprm->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 > cprm->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 */
	if (!dump_emit(cprm, &dump, sizeof(dump)))
		goto end_coredump;
	/* Now dump all of the user data.  Include malloced stuff as well */
	if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
		goto end_coredump;
	/* 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;
		if (!dump_emit(cprm, (void *)dump_start, dump_size))
			goto end_coredump;
	}
	/* Now prepare to dump the stack area */
	if (dump.u_ssize != 0) {
		dump_start = START_STACK(dump);
		dump_size = dump.u_ssize << PAGE_SHIFT;
		if (!dump_emit(cprm, (void *)dump_start, dump_size))
			goto end_coredump;
	}
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)
{
	unsigned long error, fd_offset, rlim;
	struct pt_regs *regs = current_pt_regs();
	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(file_inode(bprm->file)) <
	    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 = rlimit(RLIMIT_DATA);
	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 */
	set_personality(PER_LINUX);
	set_personality_ia32(false);

	setup_new_exec(bprm);

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

	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));

	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
	if (retval < 0)
		return retval;

	install_exec_creds(bprm);

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

		text_addr = N_TXTADDR(ex);
		map_size = ex.a_text+ex.a_data;

		error = vm_brk(text_addr & PAGE_MASK, map_size);

		if (error != (text_addr & PAGE_MASK))
			return error;

		error = read_code(bprm->file, text_addr, 32,
				  ex.a_text + ex.a_data);
		if ((signed long)error < 0)
			return error;
	} else {
#ifdef WARN_OLD
		static unsigned long error_time, error_time2;
		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
		    (N_MAGIC(ex) != NMAGIC) &&
				time_after(jiffies, error_time2 + 5*HZ)) {
			printk(KERN_NOTICE "executable not page aligned\n");
			error_time2 = jiffies;
		}

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

		if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
			vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
			read_code(bprm->file, N_TXTADDR(ex), fd_offset,
					ex.a_text+ex.a_data);
			goto beyond_if;
		}

		error = vm_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);

		if (error != N_TXTADDR(ex))
			return error;

		error = vm_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);
		if (error != N_DATADDR(ex))
			return error;
	}
beyond_if:
	set_binfmt(&aout_format);

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

	current->mm->start_stack =
		(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	/* start thread */
	loadsegment(fs, 0);
	loadsegment(ds, __USER32_DS);
	loadsegment(es, __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);
	return 0;
}

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


	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(file_inode(file)) <
	    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) {
#ifdef WARN_OLD
		static unsigned long error_time;
		if (time_after(jiffies, error_time + 5*HZ)) {
			printk(KERN_WARNING
			       "N_TXTOFF is not page aligned. Please convert "
			       "library: %pD\n",
			       file);
			error_time = jiffies;
		}
#endif
		vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);

		read_code(file, start_addr, N_TXTOFF(ex),
			  ex.a_text + ex.a_data);
		retval = 0;
		goto out;
	}
	/* Now use mmap to map the library into memory. */
	error = vm_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));
	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) {
		error = vm_brk(start_addr + len, bss - len);
		retval = error;
		if (error != start_addr + len)
			goto out;
	}
	retval = 0;
out:
	return retval;
}

static int __init init_aout_binfmt(void)
{
	register_binfmt(&aout_format);
	return 0;
}

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>
1da177e4 LT	24	#include <linux/binfmts.h>
	25	#include <linux/personality.h>
	26	#include <linux/init.h>
e5fc3161	27	#include <linux/jiffies.h>
7d2f551f	28	#include <linux/perf_event.h>
1da177e4	29
1da177e4 LT	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
1da177e4	37
71613c3b	38	static int load_aout_binary(struct linux_binprm *);
8edf8bee	39	static int load_aout_library(struct file *);
1da177e4	40
7d2f551f AV	41	#ifdef CONFIG_COREDUMP
	42	static int aout_core_dump(struct coredump_params *);
	43
	44	static unsigned long get_dr(int n)
	45	{
	46	struct perf_event *bp = current->thread.ptrace_bps[n];
	47	return bp ? bp->hw.info.address : 0;
	48	}
1da177e4 LT	49
	50	/*
	51	* fill in the user structure for a core dump..
	52	*/
8edf8bee	53	static void dump_thread32(struct pt_regs regs, struct user32 dump)
1da177e4	54	{
8edf8bee	55	u32 fs, gs;
7d2f551f	56	memset(dump, 0, sizeof(*dump));
1da177e4 LT	57
	58	/* changed the size calculations - should hopefully work better. lbt */
	59	dump->magic = CMAGIC;
	60	dump->start_code = 0;
65ea5b03	61	dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
1da177e4	62	dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
8edf8bee TG	63	dump->u_dsize = ((unsigned long)
8edf8bee TG	64	(current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
1da177e4	65	dump->u_dsize -= dump->u_tsize;
7d2f551f AV	66	dump->u_debugreg[0] = get_dr(0);
	67	dump->u_debugreg[1] = get_dr(1);
	68	dump->u_debugreg[2] = get_dr(2);
	69	dump->u_debugreg[3] = get_dr(3);
8edf8bee	70	dump->u_debugreg[6] = current->thread.debugreg6;
7d2f551f	71	dump->u_debugreg[7] = current->thread.ptrace_dr7;
8edf8bee TG	72
	73	if (dump->start_stack < 0xc0000000) {
	74	unsigned long tmp;
	75
	76	tmp = (unsigned long) (0xc0000000 - dump->start_stack);
	77	dump->u_ssize = tmp >> PAGE_SHIFT;
	78	}
1da177e4	79
7d2f551f AV	80	dump->regs.ebx = regs->bx;
	81	dump->regs.ecx = regs->cx;
	82	dump->regs.edx = regs->dx;
	83	dump->regs.esi = regs->si;
	84	dump->regs.edi = regs->di;
	85	dump->regs.ebp = regs->bp;
	86	dump->regs.eax = regs->ax;
1da177e4 LT	87	dump->regs.ds = current->thread.ds;
1da177e4 LT	88	dump->regs.es = current->thread.es;
b6edbb1e JF	89	savesegment(fs, fs);
	90	dump->regs.fs = fs;
	91	savesegment(gs, gs);
	92	dump->regs.gs = gs;
7d2f551f AV	93	dump->regs.orig_eax = regs->orig_ax;
7d2f551f AV	94	dump->regs.eip = regs->ip;
1da177e4	95	dump->regs.cs = regs->cs;
7d2f551f AV	96	dump->regs.eflags = regs->flags;
7d2f551f AV	97	dump->regs.esp = regs->sp;
1da177e4 LT	98	dump->regs.ss = regs->ss;
	99
	100	#if 1 /* FIXME */
	101	dump->u_fpvalid = 0;
	102	#else
8edf8bee	103	dump->u_fpvalid = dump_fpu(regs, &dump->i387);
1da177e4 LT	104	#endif
	105	}
	106
	107	#endif
	108
	109	static struct linux_binfmt aout_format = {
	110	.module = THIS_MODULE,
	111	.load_binary = load_aout_binary,
	112	.load_shlib = load_aout_library,
7d2f551f	113	#ifdef CONFIG_COREDUMP
1da177e4 LT	114	.core_dump = aout_core_dump,
	115	#endif
	116	.min_coredump = PAGE_SIZE
	117	};
	118
	119	static void set_brk(unsigned long start, unsigned long end)
	120	{
	121	start = PAGE_ALIGN(start);
	122	end = PAGE_ALIGN(end);
	123	if (end <= start)
	124	return;
e4eb1ff6	125	vm_brk(start, end - start);
1da177e4 LT	126	}
1da177e4 LT	127
7d2f551f	128	#ifdef CONFIG_COREDUMP
1da177e4 LT	129	/*
	130	* These are the only things you should do on a core-file: use only these
	131	* macros to write out all the necessary info.
	132	*/
	133
0eead9ab	134	#include <linux/coredump.h>
1da177e4	135
7d2f551f	136	#define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
8edf8bee	137	#define START_STACK(u) (u.start_stack)
1da177e4 LT	138
	139	/*
	140	* Routine writes a core dump image in the current directory.
	141	* Currently only a stub-function.
	142	*
	143	* Note that setuid/setgid files won't make a core-dump if the uid/gid
	144	* changed due to the set[u\|g]id. It's enforced by the "current->mm->dumpable"
	145	* field, which also makes sure the core-dumps won't be recursive if the
	146	* dumping of the process results in another error..
	147	*/
	148
7d2f551f	149	static int aout_core_dump(struct coredump_params *cprm)
1da177e4 LT	150	{
	151	mm_segment_t fs;
	152	int has_dumped = 0;
	153	unsigned long dump_start, dump_size;
	154	struct user32 dump;
1da177e4 LT	155
	156	fs = get_fs();
	157	set_fs(KERNEL_DS);
	158	has_dumped = 1;
8edf8bee	159	strncpy(dump.u_comm, current->comm, sizeof(current->comm));
6e16d89b	160	dump.u_ar0 = offsetof(struct user32, regs);
7d2f551f AV	161	dump.signal = cprm->siginfo->si_signo;
7d2f551f AV	162	dump_thread32(cprm->regs, &dump);
1da177e4	163
8edf8bee TG	164	/*
	165	* If the size of the dump file exceeds the rlimit, then see
	166	* what would happen if we wrote the stack, but not the data
	167	* area.
	168	*/
7d2f551f	169	if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
1da177e4 LT	170	dump.u_dsize = 0;
1da177e4 LT	171
8edf8bee	172	/* Make sure we have enough room to write the stack and data areas. */
7d2f551f	173	if ((dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
1da177e4 LT	174	dump.u_ssize = 0;
1da177e4 LT	175
8edf8bee	176	/* make sure we actually have a data and stack area to dump */
1da177e4	177	set_fs(USER_DS);
8edf8bee TG	178	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
8edf8bee TG	179	dump.u_dsize << PAGE_SHIFT))
1da177e4	180	dump.u_dsize = 0;
8edf8bee TG	181	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
8edf8bee TG	182	dump.u_ssize << PAGE_SHIFT))
1da177e4 LT	183	dump.u_ssize = 0;
	184
	185	set_fs(KERNEL_DS);
8edf8bee	186	/* struct user */
43a5d548 AV	187	if (!dump_emit(cprm, &dump, sizeof(dump)))
43a5d548 AV	188	goto end_coredump;
8edf8bee	189	/* Now dump all of the user data. Include malloced stuff as well */
9b56d543	190	if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
43a5d548	191	goto end_coredump;
8edf8bee	192	/* now we start writing out the user space info */
1da177e4	193	set_fs(USER_DS);
8edf8bee	194	/* Dump the data area */
1da177e4 LT	195	if (dump.u_dsize != 0) {
	196	dump_start = START_DATA(dump);
	197	dump_size = dump.u_dsize << PAGE_SHIFT;
43a5d548 AV	198	if (!dump_emit(cprm, (void *)dump_start, dump_size))
43a5d548 AV	199	goto end_coredump;
1da177e4	200	}
8edf8bee	201	/* Now prepare to dump the stack area */
1da177e4 LT	202	if (dump.u_ssize != 0) {
	203	dump_start = START_STACK(dump);
	204	dump_size = dump.u_ssize << PAGE_SHIFT;
43a5d548 AV	205	if (!dump_emit(cprm, (void *)dump_start, dump_size))
43a5d548 AV	206	goto end_coredump;
1da177e4	207	}
1da177e4 LT	208	end_coredump:
	209	set_fs(fs);
	210	return has_dumped;
	211	}
	212	#endif
	213
	214	/*
	215	* create_aout_tables() parses the env- and arg-strings in new user
	216	* memory and creates the pointer tables from them, and puts their
	217	* addresses on the "stack", returning the new stack pointer value.
	218	*/
	219	static u32 __user create_aout_tables(char __user p, struct linux_binprm *bprm)
	220	{
8edf8bee TG	221	u32 __user argv, envp, *sp;
8edf8bee TG	222	int argc = bprm->argc, envc = bprm->envc;
1da177e4 LT	223
	224	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
	225	sp -= envc+1;
	226	envp = sp;
	227	sp -= argc+1;
	228	argv = sp;
8edf8bee TG	229	put_user((unsigned long) envp, --sp);
	230	put_user((unsigned long) argv, --sp);
	231	put_user(argc, --sp);
1da177e4	232	current->mm->arg_start = (unsigned long) p;
8edf8bee	233	while (argc-- > 0) {
1da177e4	234	char c;
8edf8bee TG	235
8edf8bee TG	236	put_user((u32)(unsigned long)p, argv++);
1da177e4	237	do {
8edf8bee	238	get_user(c, p++);
1da177e4 LT	239	} while (c);
1da177e4 LT	240	}
74019699	241	put_user(0, argv);
1da177e4	242	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
8edf8bee	243	while (envc-- > 0) {
1da177e4	244	char c;
8edf8bee TG	245
8edf8bee TG	246	put_user((u32)(unsigned long)p, envp++);
1da177e4	247	do {
8edf8bee	248	get_user(c, p++);
1da177e4 LT	249	} while (c);
1da177e4 LT	250	}
74019699	251	put_user(0, envp);
1da177e4 LT	252	current->mm->env_end = (unsigned long) p;
	253	return sp;
	254	}
	255
	256	/*
	257	* These are the functions used to load a.out style executables and shared
	258	* libraries. There is no binary dependent code anywhere else.
	259	*/
71613c3b	260	static int load_aout_binary(struct linux_binprm *bprm)
1da177e4	261	{
8edf8bee	262	unsigned long error, fd_offset, rlim;
71613c3b	263	struct pt_regs *regs = current_pt_regs();
1da177e4	264	struct exec ex;
1da177e4 LT	265	int retval;
	266
	267	ex = ((struct exec ) bprm->buf); /* exec-header */
	268	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	269	N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) \|\|
	270	N_TRSIZE(ex) \|\| N_DRSIZE(ex) \|\|
496ad9aa	271	i_size_read(file_inode(bprm->file)) <
8edf8bee	272	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	273	return -ENOEXEC;
	274	}
	275
	276	fd_offset = N_TXTOFF(ex);
	277
	278	/* Check initial limits. This avoids letting people circumvent
	279	* size limits imposed on them by creating programs with large
	280	* arrays in the data or bss.
	281	*/
2854e72b	282	rlim = rlimit(RLIMIT_DATA);
1da177e4 LT	283	if (rlim >= RLIM_INFINITY)
	284	rlim = ~0;
	285	if (ex.a_data + ex.a_bss > rlim)
	286	return -ENOMEM;
	287
	288	/* Flush all traces of the currently running executable */
	289	retval = flush_old_exec(bprm);
	290	if (retval)
	291	return retval;
	292
1da177e4 LT	293	/* OK, This is the point of no return */
1da177e4 LT	294	set_personality(PER_LINUX);
ce7e5d2d	295	set_personality_ia32(false);
1da177e4	296
221af7f8 LT	297	setup_new_exec(bprm);
	298
	299	regs->cs = __USER32_CS;
	300	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
	301	regs->r13 = regs->r14 = regs->r15 = 0;
	302
1da177e4 LT	303	current->mm->end_code = ex.a_text +
	304	(current->mm->start_code = N_TXTADDR(ex));
	305	current->mm->end_data = ex.a_data +
	306	(current->mm->start_data = N_DATADDR(ex));
	307	current->mm->brk = ex.a_bss +
	308	(current->mm->start_brk = N_BSSADDR(ex));
1da177e4	309
6414fa6a	310	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
19d860a1	311	if (retval < 0)
6414fa6a	312	return retval;
6414fa6a	313
a6f76f23	314	install_exec_creds(bprm);
1da177e4 LT	315
	316	if (N_MAGIC(ex) == OMAGIC) {
	317	unsigned long text_addr, map_size;
1da177e4 LT	318
1da177e4 LT	319	text_addr = N_TXTADDR(ex);
1da177e4 LT	320	map_size = ex.a_text+ex.a_data;
1da177e4 LT	321
e4eb1ff6	322	error = vm_brk(text_addr & PAGE_MASK, map_size);
1da177e4	323
19d860a1	324	if (error != (text_addr & PAGE_MASK))
1da177e4	325	return error;
1da177e4	326
3dc20cb2 AV	327	error = read_code(bprm->file, text_addr, 32,
3dc20cb2 AV	328	ex.a_text + ex.a_data);
19d860a1	329	if ((signed long)error < 0)
1da177e4	330	return error;
1da177e4 LT	331	} else {
	332	#ifdef WARN_OLD
	333	static unsigned long error_time, error_time2;
	334	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
e5fc3161 JL	335	(N_MAGIC(ex) != NMAGIC) &&
e5fc3161 JL	336	time_after(jiffies, error_time2 + 5*HZ)) {
1da177e4 LT	337	printk(KERN_NOTICE "executable not page aligned\n");
	338	error_time2 = jiffies;
	339	}
	340
	341	if ((fd_offset & ~PAGE_MASK) != 0 &&
e5fc3161	342	time_after(jiffies, error_time + 5*HZ)) {
8edf8bee TG	343	printk(KERN_WARNING
8edf8bee TG	344	"fd_offset is not page aligned. Please convert "
a455589f AV	345	"program: %pD\n",
a455589f AV	346	bprm->file);
1da177e4 LT	347	error_time = jiffies;
	348	}
	349	#endif
	350
8edf8bee	351	if (!bprm->file->f_op->mmap \|\| (fd_offset & ~PAGE_MASK) != 0) {
e4eb1ff6	352	vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
3dc20cb2 AV	353	read_code(bprm->file, N_TXTADDR(ex), fd_offset,
3dc20cb2 AV	354	ex.a_text+ex.a_data);
1da177e4 LT	355	goto beyond_if;
	356	}
	357
6be5ceb0	358	error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
8edf8bee TG	359	PROT_READ \| PROT_EXEC,
	360	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
	361	MAP_EXECUTABLE \| MAP_32BIT,
	362	fd_offset);
1da177e4	363
19d860a1	364	if (error != N_TXTADDR(ex))
1da177e4	365	return error;
1da177e4	366
6be5ceb0	367	error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
1da177e4	368	PROT_READ \| PROT_WRITE \| PROT_EXEC,
8edf8bee TG	369	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
8edf8bee TG	370	MAP_EXECUTABLE \| MAP_32BIT,
1da177e4	371	fd_offset + ex.a_text);
19d860a1	372	if (error != N_DATADDR(ex))
1da177e4	373	return error;
1da177e4 LT	374	}
	375	beyond_if:
	376	set_binfmt(&aout_format);
	377
	378	set_brk(current->mm->start_brk, current->mm->brk);
	379
1da177e4 LT	380	current->mm->start_stack =
	381	(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	382	/* start thread */
b6edbb1e JF	383	loadsegment(fs, 0);
	384	loadsegment(ds, __USER32_DS);
	385	loadsegment(es, __USER32_DS);
8edf8bee	386	load_gs_index(0);
65ea5b03 PA	387	(regs)->ip = ex.a_entry;
	388	(regs)->sp = current->mm->start_stack;
	389	(regs)->flags = 0x200;
1da177e4 LT	390	(regs)->cs = __USER32_CS;
1da177e4 LT	391	(regs)->ss = __USER32_DS;
f891dd18 AK	392	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
f891dd18 AK	393	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
1da177e4	394	set_fs(USER_DS);
1da177e4 LT	395	return 0;
	396	}
	397
	398	static int load_aout_library(struct file *file)
	399	{
8edf8bee	400	unsigned long bss, start_addr, len, error;
1da177e4 LT	401	int retval;
	402	struct exec ex;
	403
1da177e4 LT	404
	405	retval = -ENOEXEC;
	406	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
	407	if (error != sizeof(ex))
	408	goto out;
	409
	410	/* We come in here for the regular a.out style of shared libraries */
	411	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	412	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
496ad9aa	413	i_size_read(file_inode(file)) <
8edf8bee	414	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	415	goto out;
	416	}
	417
	418	if (N_FLAGS(ex))
	419	goto out;
	420
	421	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	422	this off to get the starting address for the page */
	423
	424	start_addr = ex.a_entry & 0xfffff000;
	425
	426	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
1da177e4 LT	427	#ifdef WARN_OLD
1da177e4 LT	428	static unsigned long error_time;
e5fc3161	429	if (time_after(jiffies, error_time + 5*HZ)) {
8edf8bee TG	430	printk(KERN_WARNING
8edf8bee TG	431	"N_TXTOFF is not page aligned. Please convert "
a455589f AV	432	"library: %pD\n",
a455589f AV	433	file);
1da177e4 LT	434	error_time = jiffies;
	435	}
	436	#endif
e4eb1ff6	437	vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
8edf8bee	438
3dc20cb2 AV	439	read_code(file, start_addr, N_TXTOFF(ex),
3dc20cb2 AV	440	ex.a_text + ex.a_data);
1da177e4 LT	441	retval = 0;
	442	goto out;
	443	}
	444	/* Now use mmap to map the library into memory. */
6be5ceb0	445	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
1da177e4 LT	446	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	447	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_32BIT,
	448	N_TXTOFF(ex));
1da177e4 LT	449	retval = error;
	450	if (error != start_addr)
	451	goto out;
	452
	453	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	454	bss = ex.a_text + ex.a_data + ex.a_bss;
	455	if (bss > len) {
e4eb1ff6	456	error = vm_brk(start_addr + len, bss - len);
1da177e4 LT	457	retval = error;
	458	if (error != start_addr + len)
	459	goto out;
	460	}
	461	retval = 0;
	462	out:
	463	return retval;
	464	}
	465
	466	static int __init init_aout_binfmt(void)
	467	{
8fc3dc5a AV	468	register_binfmt(&aout_format);
8fc3dc5a AV	469	return 0;
1da177e4 LT	470	}
	471
	472	static void __exit exit_aout_binfmt(void)
	473	{
	474	unregister_binfmt(&aout_format);
	475	}
	476
	477	module_init(init_aout_binfmt);
	478	module_exit(exit_aout_binfmt);
	479	MODULE_LICENSE("GPL");