[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 <linux/sched/task_stack.h>

#include <linux/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 fill_dump(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 int set_brk(unsigned long start, unsigned long end)
{
	start = PAGE_ALIGN(start);
	end = PAGE_ALIGN(end);
	if (end <= start)
		return 0;
	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;

	fill_dump(cprm->regs, &dump);

	strncpy(dump.u_comm, current->comm, sizeof(current->comm));
	dump.u_ar0 = offsetof(struct user32, regs);
	dump.signal = cprm->siginfo->si_signo;

	/*
	 * 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)
			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) {
			error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
			if (error)
				return error;

			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:
	error = set_brk(current->mm->start_brk, current->mm->brk);
	if (error)
		return error;

	set_binfmt(&aout_format);

	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;
	loff_t pos = 0;

	retval = -ENOEXEC;
	error = kernel_read(file, &ex, sizeof(ex), &pos);
	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
		retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
		if (retval)
			goto out;

		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) {
		retval = vm_brk(start_addr + len, bss - len);
		if (retval)
			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>
68db0cf1	29	#include <linux/sched/task_stack.h>
1da177e4	30
7c0f6ba6	31	#include <linux/uaccess.h>
1da177e4 LT	32	#include <asm/pgalloc.h>
	33	#include <asm/cacheflush.h>
	34	#include <asm/user32.h>
	35	#include <asm/ia32.h>
	36
	37	#undef WARN_OLD
1da177e4	38
71613c3b	39	static int load_aout_binary(struct linux_binprm *);
8edf8bee	40	static int load_aout_library(struct file *);
1da177e4	41
7d2f551f AV	42	#ifdef CONFIG_COREDUMP
	43	static int aout_core_dump(struct coredump_params *);
	44
	45	static unsigned long get_dr(int n)
	46	{
	47	struct perf_event *bp = current->thread.ptrace_bps[n];
	48	return bp ? bp->hw.info.address : 0;
	49	}
1da177e4 LT	50
	51	/*
	52	* fill in the user structure for a core dump..
	53	*/
24975d23	54	static void fill_dump(struct pt_regs regs, struct user32 dump)
1da177e4	55	{
8edf8bee	56	u32 fs, gs;
7d2f551f	57	memset(dump, 0, sizeof(*dump));
1da177e4 LT	58
	59	/* changed the size calculations - should hopefully work better. lbt */
	60	dump->magic = CMAGIC;
	61	dump->start_code = 0;
65ea5b03	62	dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
1da177e4	63	dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
8edf8bee TG	64	dump->u_dsize = ((unsigned long)
8edf8bee TG	65	(current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
1da177e4	66	dump->u_dsize -= dump->u_tsize;
7d2f551f AV	67	dump->u_debugreg[0] = get_dr(0);
	68	dump->u_debugreg[1] = get_dr(1);
	69	dump->u_debugreg[2] = get_dr(2);
	70	dump->u_debugreg[3] = get_dr(3);
8edf8bee	71	dump->u_debugreg[6] = current->thread.debugreg6;
7d2f551f	72	dump->u_debugreg[7] = current->thread.ptrace_dr7;
8edf8bee TG	73
	74	if (dump->start_stack < 0xc0000000) {
	75	unsigned long tmp;
	76
	77	tmp = (unsigned long) (0xc0000000 - dump->start_stack);
	78	dump->u_ssize = tmp >> PAGE_SHIFT;
	79	}
1da177e4	80
7d2f551f AV	81	dump->regs.ebx = regs->bx;
	82	dump->regs.ecx = regs->cx;
	83	dump->regs.edx = regs->dx;
	84	dump->regs.esi = regs->si;
	85	dump->regs.edi = regs->di;
	86	dump->regs.ebp = regs->bp;
	87	dump->regs.eax = regs->ax;
1da177e4 LT	88	dump->regs.ds = current->thread.ds;
1da177e4 LT	89	dump->regs.es = current->thread.es;
b6edbb1e JF	90	savesegment(fs, fs);
	91	dump->regs.fs = fs;
	92	savesegment(gs, gs);
	93	dump->regs.gs = gs;
7d2f551f AV	94	dump->regs.orig_eax = regs->orig_ax;
7d2f551f AV	95	dump->regs.eip = regs->ip;
1da177e4	96	dump->regs.cs = regs->cs;
7d2f551f AV	97	dump->regs.eflags = regs->flags;
7d2f551f AV	98	dump->regs.esp = regs->sp;
1da177e4 LT	99	dump->regs.ss = regs->ss;
	100
	101	#if 1 /* FIXME */
	102	dump->u_fpvalid = 0;
	103	#else
8edf8bee	104	dump->u_fpvalid = dump_fpu(regs, &dump->i387);
1da177e4 LT	105	#endif
	106	}
	107
	108	#endif
	109
	110	static struct linux_binfmt aout_format = {
	111	.module = THIS_MODULE,
	112	.load_binary = load_aout_binary,
	113	.load_shlib = load_aout_library,
7d2f551f	114	#ifdef CONFIG_COREDUMP
1da177e4 LT	115	.core_dump = aout_core_dump,
	116	#endif
	117	.min_coredump = PAGE_SIZE
	118	};
	119
5d22fc25	120	static int set_brk(unsigned long start, unsigned long end)
1da177e4 LT	121	{
	122	start = PAGE_ALIGN(start);
	123	end = PAGE_ALIGN(end);
	124	if (end <= start)
5d22fc25	125	return 0;
864778b1	126	return vm_brk(start, end - start);
1da177e4 LT	127	}
1da177e4 LT	128
7d2f551f	129	#ifdef CONFIG_COREDUMP
1da177e4 LT	130	/*
	131	* These are the only things you should do on a core-file: use only these
	132	* macros to write out all the necessary info.
	133	*/
	134
0eead9ab	135	#include <linux/coredump.h>
1da177e4	136
7d2f551f	137	#define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
8edf8bee	138	#define START_STACK(u) (u.start_stack)
1da177e4 LT	139
	140	/*
	141	* Routine writes a core dump image in the current directory.
	142	* Currently only a stub-function.
	143	*
	144	* Note that setuid/setgid files won't make a core-dump if the uid/gid
	145	* changed due to the set[u\|g]id. It's enforced by the "current->mm->dumpable"
	146	* field, which also makes sure the core-dumps won't be recursive if the
	147	* dumping of the process results in another error..
	148	*/
	149
7d2f551f	150	static int aout_core_dump(struct coredump_params *cprm)
1da177e4 LT	151	{
	152	mm_segment_t fs;
	153	int has_dumped = 0;
	154	unsigned long dump_start, dump_size;
	155	struct user32 dump;
1da177e4 LT	156
	157	fs = get_fs();
	158	set_fs(KERNEL_DS);
	159	has_dumped = 1;
24975d23 BP	160
	161	fill_dump(cprm->regs, &dump);
	162
8edf8bee	163	strncpy(dump.u_comm, current->comm, sizeof(current->comm));
6e16d89b	164	dump.u_ar0 = offsetof(struct user32, regs);
7d2f551f	165	dump.signal = cprm->siginfo->si_signo;
1da177e4	166
8edf8bee TG	167	/*
	168	* If the size of the dump file exceeds the rlimit, then see
	169	* what would happen if we wrote the stack, but not the data
	170	* area.
	171	*/
7d2f551f	172	if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
1da177e4 LT	173	dump.u_dsize = 0;
1da177e4 LT	174
8edf8bee	175	/* Make sure we have enough room to write the stack and data areas. */
7d2f551f	176	if ((dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
1da177e4 LT	177	dump.u_ssize = 0;
1da177e4 LT	178
8edf8bee	179	/* make sure we actually have a data and stack area to dump */
1da177e4	180	set_fs(USER_DS);
8edf8bee TG	181	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
8edf8bee TG	182	dump.u_dsize << PAGE_SHIFT))
1da177e4	183	dump.u_dsize = 0;
8edf8bee TG	184	if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
8edf8bee TG	185	dump.u_ssize << PAGE_SHIFT))
1da177e4 LT	186	dump.u_ssize = 0;
	187
	188	set_fs(KERNEL_DS);
8edf8bee	189	/* struct user */
43a5d548 AV	190	if (!dump_emit(cprm, &dump, sizeof(dump)))
43a5d548 AV	191	goto end_coredump;
8edf8bee	192	/* Now dump all of the user data. Include malloced stuff as well */
9b56d543	193	if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
43a5d548	194	goto end_coredump;
8edf8bee	195	/* now we start writing out the user space info */
1da177e4	196	set_fs(USER_DS);
8edf8bee	197	/* Dump the data area */
1da177e4 LT	198	if (dump.u_dsize != 0) {
	199	dump_start = START_DATA(dump);
	200	dump_size = dump.u_dsize << PAGE_SHIFT;
43a5d548 AV	201	if (!dump_emit(cprm, (void *)dump_start, dump_size))
43a5d548 AV	202	goto end_coredump;
1da177e4	203	}
8edf8bee	204	/* Now prepare to dump the stack area */
1da177e4 LT	205	if (dump.u_ssize != 0) {
	206	dump_start = START_STACK(dump);
	207	dump_size = dump.u_ssize << PAGE_SHIFT;
43a5d548 AV	208	if (!dump_emit(cprm, (void *)dump_start, dump_size))
43a5d548 AV	209	goto end_coredump;
1da177e4	210	}
1da177e4 LT	211	end_coredump:
	212	set_fs(fs);
	213	return has_dumped;
	214	}
	215	#endif
	216
	217	/*
	218	* create_aout_tables() parses the env- and arg-strings in new user
	219	* memory and creates the pointer tables from them, and puts their
	220	* addresses on the "stack", returning the new stack pointer value.
	221	*/
	222	static u32 __user create_aout_tables(char __user p, struct linux_binprm *bprm)
	223	{
8edf8bee TG	224	u32 __user argv, envp, *sp;
8edf8bee TG	225	int argc = bprm->argc, envc = bprm->envc;
1da177e4 LT	226
	227	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
	228	sp -= envc+1;
	229	envp = sp;
	230	sp -= argc+1;
	231	argv = sp;
8edf8bee TG	232	put_user((unsigned long) envp, --sp);
	233	put_user((unsigned long) argv, --sp);
	234	put_user(argc, --sp);
1da177e4	235	current->mm->arg_start = (unsigned long) p;
8edf8bee	236	while (argc-- > 0) {
1da177e4	237	char c;
8edf8bee TG	238
8edf8bee TG	239	put_user((u32)(unsigned long)p, argv++);
1da177e4	240	do {
8edf8bee	241	get_user(c, p++);
1da177e4 LT	242	} while (c);
1da177e4 LT	243	}
74019699	244	put_user(0, argv);
1da177e4	245	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
8edf8bee	246	while (envc-- > 0) {
1da177e4	247	char c;
8edf8bee TG	248
8edf8bee TG	249	put_user((u32)(unsigned long)p, envp++);
1da177e4	250	do {
8edf8bee	251	get_user(c, p++);
1da177e4 LT	252	} while (c);
1da177e4 LT	253	}
74019699	254	put_user(0, envp);
1da177e4 LT	255	current->mm->env_end = (unsigned long) p;
	256	return sp;
	257	}
	258
	259	/*
	260	* These are the functions used to load a.out style executables and shared
	261	* libraries. There is no binary dependent code anywhere else.
	262	*/
71613c3b	263	static int load_aout_binary(struct linux_binprm *bprm)
1da177e4	264	{
8edf8bee	265	unsigned long error, fd_offset, rlim;
71613c3b	266	struct pt_regs *regs = current_pt_regs();
1da177e4	267	struct exec ex;
1da177e4 LT	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) \|\|
496ad9aa	274	i_size_read(file_inode(bprm->file)) <
8edf8bee	275	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	276	return -ENOEXEC;
	277	}
	278
	279	fd_offset = N_TXTOFF(ex);
	280
	281	/* Check initial limits. This avoids letting people circumvent
	282	* size limits imposed on them by creating programs with large
	283	* arrays in the data or bss.
	284	*/
2854e72b	285	rlim = rlimit(RLIMIT_DATA);
1da177e4 LT	286	if (rlim >= RLIM_INFINITY)
	287	rlim = ~0;
	288	if (ex.a_data + ex.a_bss > rlim)
	289	return -ENOMEM;
	290
	291	/* Flush all traces of the currently running executable */
	292	retval = flush_old_exec(bprm);
	293	if (retval)
	294	return retval;
	295
1da177e4 LT	296	/* OK, This is the point of no return */
1da177e4 LT	297	set_personality(PER_LINUX);
ce7e5d2d	298	set_personality_ia32(false);
1da177e4	299
221af7f8 LT	300	setup_new_exec(bprm);
	301
	302	regs->cs = __USER32_CS;
	303	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
	304	regs->r13 = regs->r14 = regs->r15 = 0;
	305
1da177e4 LT	306	current->mm->end_code = ex.a_text +
	307	(current->mm->start_code = N_TXTADDR(ex));
	308	current->mm->end_data = ex.a_data +
	309	(current->mm->start_data = N_DATADDR(ex));
	310	current->mm->brk = ex.a_bss +
	311	(current->mm->start_brk = N_BSSADDR(ex));
1da177e4	312
6414fa6a	313	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
19d860a1	314	if (retval < 0)
6414fa6a	315	return retval;
6414fa6a	316
a6f76f23	317	install_exec_creds(bprm);
1da177e4 LT	318
	319	if (N_MAGIC(ex) == OMAGIC) {
	320	unsigned long text_addr, map_size;
1da177e4 LT	321
1da177e4 LT	322	text_addr = N_TXTADDR(ex);
1da177e4 LT	323	map_size = ex.a_text+ex.a_data;
1da177e4 LT	324
e4eb1ff6	325	error = vm_brk(text_addr & PAGE_MASK, map_size);
1da177e4	326
5d22fc25	327	if (error)
1da177e4	328	return error;
1da177e4	329
3dc20cb2 AV	330	error = read_code(bprm->file, text_addr, 32,
3dc20cb2 AV	331	ex.a_text + ex.a_data);
19d860a1	332	if ((signed long)error < 0)
1da177e4	333	return error;
1da177e4 LT	334	} else {
	335	#ifdef WARN_OLD
	336	static unsigned long error_time, error_time2;
	337	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
e5fc3161 JL	338	(N_MAGIC(ex) != NMAGIC) &&
e5fc3161 JL	339	time_after(jiffies, error_time2 + 5*HZ)) {
1da177e4 LT	340	printk(KERN_NOTICE "executable not page aligned\n");
	341	error_time2 = jiffies;
	342	}
	343
	344	if ((fd_offset & ~PAGE_MASK) != 0 &&
e5fc3161	345	time_after(jiffies, error_time + 5*HZ)) {
8edf8bee TG	346	printk(KERN_WARNING
8edf8bee TG	347	"fd_offset is not page aligned. Please convert "
a455589f AV	348	"program: %pD\n",
a455589f AV	349	bprm->file);
1da177e4 LT	350	error_time = jiffies;
	351	}
	352	#endif
	353
8edf8bee	354	if (!bprm->file->f_op->mmap \|\| (fd_offset & ~PAGE_MASK) != 0) {
864778b1	355	error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
5d22fc25	356	if (error)
864778b1 MH	357	return error;
864778b1 MH	358
3dc20cb2 AV	359	read_code(bprm->file, N_TXTADDR(ex), fd_offset,
3dc20cb2 AV	360	ex.a_text+ex.a_data);
1da177e4 LT	361	goto beyond_if;
	362	}
	363
6be5ceb0	364	error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
8edf8bee TG	365	PROT_READ \| PROT_EXEC,
	366	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
	367	MAP_EXECUTABLE \| MAP_32BIT,
	368	fd_offset);
1da177e4	369
19d860a1	370	if (error != N_TXTADDR(ex))
1da177e4	371	return error;
1da177e4	372
6be5ceb0	373	error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
1da177e4	374	PROT_READ \| PROT_WRITE \| PROT_EXEC,
8edf8bee TG	375	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
8edf8bee TG	376	MAP_EXECUTABLE \| MAP_32BIT,
1da177e4	377	fd_offset + ex.a_text);
19d860a1	378	if (error != N_DATADDR(ex))
1da177e4	379	return error;
1da177e4	380	}
864778b1	381
1da177e4	382	beyond_if:
864778b1	383	error = set_brk(current->mm->start_brk, current->mm->brk);
5d22fc25	384	if (error)
864778b1	385	return error;
1da177e4	386
864778b1	387	set_binfmt(&aout_format);
1da177e4	388
1da177e4 LT	389	current->mm->start_stack =
	390	(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	391	/* start thread */
b6edbb1e JF	392	loadsegment(fs, 0);
	393	loadsegment(ds, __USER32_DS);
	394	loadsegment(es, __USER32_DS);
8edf8bee	395	load_gs_index(0);
65ea5b03 PA	396	(regs)->ip = ex.a_entry;
	397	(regs)->sp = current->mm->start_stack;
	398	(regs)->flags = 0x200;
1da177e4 LT	399	(regs)->cs = __USER32_CS;
1da177e4 LT	400	(regs)->ss = __USER32_DS;
f891dd18 AK	401	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
f891dd18 AK	402	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
1da177e4	403	set_fs(USER_DS);
1da177e4 LT	404	return 0;
	405	}
	406
	407	static int load_aout_library(struct file *file)
	408	{
8edf8bee	409	unsigned long bss, start_addr, len, error;
1da177e4 LT	410	int retval;
1da177e4 LT	411	struct exec ex;
bdd1d2d3	412	loff_t pos = 0;
1da177e4 LT	413
1da177e4 LT	414	retval = -ENOEXEC;
bdd1d2d3	415	error = kernel_read(file, &ex, sizeof(ex), &pos);
1da177e4 LT	416	if (error != sizeof(ex))
	417	goto out;
	418
	419	/* We come in here for the regular a.out style of shared libraries */
	420	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	421	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
496ad9aa	422	i_size_read(file_inode(file)) <
8edf8bee	423	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	424	goto out;
	425	}
	426
	427	if (N_FLAGS(ex))
	428	goto out;
	429
	430	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	431	this off to get the starting address for the page */
	432
	433	start_addr = ex.a_entry & 0xfffff000;
	434
	435	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
1da177e4 LT	436	#ifdef WARN_OLD
1da177e4 LT	437	static unsigned long error_time;
e5fc3161	438	if (time_after(jiffies, error_time + 5*HZ)) {
8edf8bee TG	439	printk(KERN_WARNING
8edf8bee TG	440	"N_TXTOFF is not page aligned. Please convert "
a455589f AV	441	"library: %pD\n",
a455589f AV	442	file);
1da177e4 LT	443	error_time = jiffies;
	444	}
	445	#endif
864778b1	446	retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
5d22fc25	447	if (retval)
864778b1	448	goto out;
8edf8bee	449
3dc20cb2 AV	450	read_code(file, start_addr, N_TXTOFF(ex),
3dc20cb2 AV	451	ex.a_text + ex.a_data);
1da177e4 LT	452	retval = 0;
	453	goto out;
	454	}
	455	/* Now use mmap to map the library into memory. */
6be5ceb0	456	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
1da177e4 LT	457	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	458	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_32BIT,
	459	N_TXTOFF(ex));
1da177e4 LT	460	retval = error;
	461	if (error != start_addr)
	462	goto out;
	463
	464	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	465	bss = ex.a_text + ex.a_data + ex.a_bss;
	466	if (bss > len) {
5d22fc25 LT	467	retval = vm_brk(start_addr + len, bss - len);
5d22fc25 LT	468	if (retval)
1da177e4 LT	469	goto out;
	470	}
	471	retval = 0;
	472	out:
	473	return retval;
	474	}
	475
	476	static int __init init_aout_binfmt(void)
	477	{
8fc3dc5a AV	478	register_binfmt(&aout_format);
8fc3dc5a AV	479	return 0;
1da177e4 LT	480	}
	481
	482	static void __exit exit_aout_binfmt(void)
	483	{
	484	unregister_binfmt(&aout_format);
	485	}
	486
	487	module_init(init_aout_binfmt);
	488	module_exit(exit_aout_binfmt);
	489	MODULE_LICENSE("GPL");