[linux.git] / fs / binfmt_som.c

/*
 * linux/fs/binfmt_som.c
 *
 * These are the functions used to load SOM format executables as used
 * by HP-UX.  
 *
 * Copyright 1999 Matthew Wilcox <[email protected]>
 * based on binfmt_elf which is
 * Copyright 1993, 1994: Eric Youngdale ([email protected]).
 */

#include <linux/module.h>

#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/binfmts.h>
#include <linux/som.h>
#include <linux/string.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/shm.h>
#include <linux/personality.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>

#include <linux/config.h>

#include <linux/elf.h>

static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
static int load_som_library(struct file *);

/*
 * If we don't support core dumping, then supply a NULL so we
 * don't even try.
 */
#if 0
static int som_core_dump(long signr, struct pt_regs * regs);
#else
#define som_core_dump	NULL
#endif

#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))

static struct linux_binfmt som_format = {
	.module		= THIS_MODULE,
	.load_binary	= load_som_binary,
	.load_shlib	= load_som_library,
	.core_dump	= som_core_dump,
	.min_coredump	= SOM_PAGESIZE
};

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

	/* Word-align the stack pointer */
	sp = (unsigned long *)((bprm->p + 3) & ~3);

	envp = (char **) sp;
	sp += envc + 1;
	argv = (char **) sp;
	sp += argc + 1;

	__put_user((unsigned long) envp,++sp);
	__put_user((unsigned long) argv,++sp);

	__put_user(argc, ++sp);

	bprm->p = (unsigned long) sp;

	p = current->mm->arg_start;
	while (argc-- > 0) {
		__put_user((char *)p,argv++);
		p += strlen_user((char *)p);
	}
	__put_user(NULL, argv);
	current->mm->arg_end = current->mm->env_start = p;
	while (envc-- > 0) {
		__put_user((char *)p,envp++);
		p += strlen_user((char *)p);
	}
	__put_user(NULL, envp);
	current->mm->env_end = p;
}

static int check_som_header(struct som_hdr *som_ex)
{
	int *buf = (int *)som_ex;
	int i, ck;

	if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
	    som_ex->system_id != SOM_SID_PARISC_1_1 &&
	    som_ex->system_id != SOM_SID_PARISC_2_0)
		return -ENOEXEC;

	if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
	    som_ex->a_magic != SOM_EXEC_SHARE &&
	    som_ex->a_magic != SOM_EXEC_DEMAND)
		return -ENOEXEC;

	if (som_ex->version_id != SOM_ID_OLD &&
	    som_ex->version_id != SOM_ID_NEW)
		return -ENOEXEC;

	ck = 0;
	for (i=0; i<32; i++)
		ck ^= buf[i];
	if (ck != 0)
		return -ENOEXEC;

	return 0;
}

static int map_som_binary(struct file *file,
		const struct som_exec_auxhdr *hpuxhdr)
{
	unsigned long code_start, code_size, data_start, data_size;
	unsigned long bss_start, som_brk;
	int retval;
	int prot = PROT_READ | PROT_EXEC;
	int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;

	mm_segment_t old_fs = get_fs();
	set_fs(get_ds());

	code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
	code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
	current->mm->start_code = code_start;
	current->mm->end_code = code_start + code_size;
	down_write(&current->mm->mmap_sem);
	retval = do_mmap(file, code_start, code_size, prot,
			flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
	up_write(&current->mm->mmap_sem);
	if (retval < 0 && retval > -1024)
		goto out;

	data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
	data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
	current->mm->start_data = data_start;
	current->mm->end_data = bss_start = data_start + data_size;
	down_write(&current->mm->mmap_sem);
	retval = do_mmap(file, data_start, data_size,
			prot | PROT_WRITE, flags,
			SOM_PAGESTART(hpuxhdr->exec_dfile));
	up_write(&current->mm->mmap_sem);
	if (retval < 0 && retval > -1024)
		goto out;

	som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
	current->mm->start_brk = current->mm->brk = som_brk;
	down_write(&current->mm->mmap_sem);
	retval = do_mmap(NULL, bss_start, som_brk - bss_start,
			prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
	up_write(&current->mm->mmap_sem);
	if (retval > 0 || retval < -1024)
		retval = 0;
out:
	set_fs(old_fs);
	return retval;
}


/*
 * These are the functions used to load SOM executables and shared
 * libraries.  There is no binary dependent code anywhere else.
 */

static int
load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
	int som_exec_fileno;
	int retval;
	unsigned int size;
	unsigned long som_entry;
	struct som_hdr *som_ex;
	struct som_exec_auxhdr *hpuxhdr;

	/* Get the exec-header */
	som_ex = (struct som_hdr *) bprm->buf;

	retval = check_som_header(som_ex);
	if (retval != 0)
		goto out;

	/* Now read in the auxiliary header information */

	retval = -ENOMEM;
	size = som_ex->aux_header_size;
	if (size > SOM_PAGESIZE)
		goto out;
	hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
	if (!hpuxhdr)
		goto out;

	retval = kernel_read(bprm->file, som_ex->aux_header_location,
			(char *) hpuxhdr, size);
	if (retval < 0)
		goto out_free;
#error "Fix security hole before enabling me"
	retval = get_unused_fd();
	if (retval < 0)
		goto out_free;
	get_file(bprm->file);
	fd_install(som_exec_fileno = retval, bprm->file);

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

	/* OK, This is the point of no return */
	current->flags &= ~PF_FORKNOEXEC;
	current->personality = PER_HPUX;

	/* Set the task size for HP-UX processes such that
	 * the gateway page is outside the address space.
	 * This can be fixed later, but for now, this is much
	 * easier.
	 */

	current->thread.task_size = 0xc0000000;

	/* Set map base to allow enough room for hp-ux heap growth */

	current->thread.map_base = 0x80000000;

	retval = map_som_binary(bprm->file, hpuxhdr);
	if (retval < 0)
		goto out_free;

	som_entry = hpuxhdr->exec_entry;
	kfree(hpuxhdr);

	set_binfmt(&som_format);
	compute_creds(bprm);
	setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);

	create_som_tables(bprm);

	current->mm->start_stack = bprm->p;
	set_mm_counter(current->mm, rss, 0);

#if 0
	printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
	printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
	printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
	printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
	printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
	printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
#endif

	map_hpux_gateway_page(current,current->mm);

	start_thread_som(regs, som_entry, bprm->p);
	if (current->ptrace & PT_PTRACED)
		send_sig(SIGTRAP, current, 0);
	return 0;

	/* error cleanup */
out_free:
	kfree(hpuxhdr);
out:
	return retval;
}

static int load_som_library(struct file *f)
{
/* No lib support in SOM yet.  gizza chance.. */
	return -ENOEXEC;
}
	/* Install the SOM loader.
	 * N.B. We *rely* on the table being the right size with the
	 * right number of free slots...
	 */

static int __init init_som_binfmt(void)
{
	return register_binfmt(&som_format);
}

static void __exit exit_som_binfmt(void)
{
	/* Remove the SOM loader. */
	unregister_binfmt(&som_format);
}

core_initcall(init_som_binfmt);
module_exit(exit_som_binfmt);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/binfmt_som.c
	3	*
	4	* These are the functions used to load SOM format executables as used
	5	* by HP-UX.
	6	*
	7	* Copyright 1999 Matthew Wilcox <[email protected]>
	8	* based on binfmt_elf which is
	9	* Copyright 1993, 1994: Eric Youngdale ([email protected]).
	10	*/
	11
	12	#include <linux/module.h>
	13
	14	#include <linux/fs.h>
	15	#include <linux/stat.h>
	16	#include <linux/sched.h>
	17	#include <linux/mm.h>
	18	#include <linux/mman.h>
	19	#include <linux/errno.h>
	20	#include <linux/signal.h>
	21	#include <linux/binfmts.h>
	22	#include <linux/som.h>
	23	#include <linux/string.h>
	24	#include <linux/file.h>
	25	#include <linux/fcntl.h>
	26	#include <linux/ptrace.h>
	27	#include <linux/slab.h>
	28	#include <linux/shm.h>
	29	#include <linux/personality.h>
	30	#include <linux/init.h>
	31
	32	#include <asm/uaccess.h>
	33	#include <asm/pgtable.h>
	34
	35	#include <linux/config.h>
	36
	37	#include <linux/elf.h>
	38
	39	static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
	40	static int load_som_library(struct file *);
	41
	42	/*
	43	* If we don't support core dumping, then supply a NULL so we
	44	* don't even try.
	45	*/
	46	#if 0
	47	static int som_core_dump(long signr, struct pt_regs * regs);
	48	#else
	49	#define som_core_dump NULL
	50	#endif
	51
	52	#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
	53	#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
	54	#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
	55
	56	static struct linux_binfmt som_format = {
	57	.module = THIS_MODULE,
	58	.load_binary = load_som_binary,
	59	.load_shlib = load_som_library,
	60	.core_dump = som_core_dump,
	61	.min_coredump = SOM_PAGESIZE
	62	};
	63
	64	/*
65	* create_som_tables() parses the env- and arg-strings in new user
66	* memory and creates the pointer tables from them, and puts their
67	* addresses on the "stack", returning the new stack pointer value.
68	*/
69	static void create_som_tables(struct linux_binprm *bprm)
70	{
71	char argv, envp;
72	int argc = bprm->argc;
73	int envc = bprm->envc;
74	unsigned long p;
75	unsigned long *sp;
76
77	/* Word-align the stack pointer */
78	sp = (unsigned long *)((bprm->p + 3) & ~3);
79
80	envp = (char **) sp;
81	sp += envc + 1;
82	argv = (char **) sp;
83	sp += argc + 1;
84
85	__put_user((unsigned long) envp,++sp);
86	__put_user((unsigned long) argv,++sp);
87
88	__put_user(argc, ++sp);
89
90	bprm->p = (unsigned long) sp;
91
92	p = current->mm->arg_start;
93	while (argc-- > 0) {
94	__put_user((char *)p,argv++);
95	p += strlen_user((char *)p);
96	}
97	__put_user(NULL, argv);
98	current->mm->arg_end = current->mm->env_start = p;
99	while (envc-- > 0) {
100	__put_user((char *)p,envp++);
101	p += strlen_user((char *)p);
102	}
103	__put_user(NULL, envp);
104	current->mm->env_end = p;
105	}
106
107	static int check_som_header(struct som_hdr *som_ex)
108	{
109	int buf = (int )som_ex;
110	int i, ck;
111
112	if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
113	som_ex->system_id != SOM_SID_PARISC_1_1 &&
114	som_ex->system_id != SOM_SID_PARISC_2_0)
115	return -ENOEXEC;
116
117	if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
118	som_ex->a_magic != SOM_EXEC_SHARE &&
119	som_ex->a_magic != SOM_EXEC_DEMAND)
120	return -ENOEXEC;
121
122	if (som_ex->version_id != SOM_ID_OLD &&
123	som_ex->version_id != SOM_ID_NEW)
124	return -ENOEXEC;
125
126	ck = 0;
127	for (i=0; i<32; i++)
128	ck ^= buf[i];
129	if (ck != 0)
130	return -ENOEXEC;
131
132	return 0;
133	}
134
135	static int map_som_binary(struct file *file,
136	const struct som_exec_auxhdr *hpuxhdr)
137	{
138	unsigned long code_start, code_size, data_start, data_size;
139	unsigned long bss_start, som_brk;
140	int retval;
141	int prot = PROT_READ \| PROT_EXEC;
142	int flags = MAP_FIXED\|MAP_PRIVATE\|MAP_DENYWRITE\|MAP_EXECUTABLE;
143
144	mm_segment_t old_fs = get_fs();
145	set_fs(get_ds());
146
147	code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
148	code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
149	current->mm->start_code = code_start;
150	current->mm->end_code = code_start + code_size;
151	down_write(&current->mm->mmap_sem);
152	retval = do_mmap(file, code_start, code_size, prot,
153	flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
154	up_write(&current->mm->mmap_sem);
155	if (retval < 0 && retval > -1024)
156	goto out;
157
158	data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
159	data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
160	current->mm->start_data = data_start;
161	current->mm->end_data = bss_start = data_start + data_size;
162	down_write(&current->mm->mmap_sem);
163	retval = do_mmap(file, data_start, data_size,
164	prot \| PROT_WRITE, flags,
165	SOM_PAGESTART(hpuxhdr->exec_dfile));
166	up_write(&current->mm->mmap_sem);
167	if (retval < 0 && retval > -1024)
168	goto out;
169
170	som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
171	current->mm->start_brk = current->mm->brk = som_brk;
172	down_write(&current->mm->mmap_sem);
173	retval = do_mmap(NULL, bss_start, som_brk - bss_start,
174	prot \| PROT_WRITE, MAP_FIXED \| MAP_PRIVATE, 0);
175	up_write(&current->mm->mmap_sem);
176	if (retval > 0 \|\| retval < -1024)
177	retval = 0;
178	out:
179	set_fs(old_fs);
180	return retval;
181	}
182
183
184	/*
185	* These are the functions used to load SOM executables and shared
186	* libraries. There is no binary dependent code anywhere else.
187	*/
188
189	static int
190	load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
191	{
192	int som_exec_fileno;
193	int retval;
194	unsigned int size;
195	unsigned long som_entry;
196	struct som_hdr *som_ex;
197	struct som_exec_auxhdr *hpuxhdr;
198
199	/* Get the exec-header */
200	som_ex = (struct som_hdr *) bprm->buf;
201
202	retval = check_som_header(som_ex);
203	if (retval != 0)
204	goto out;
205
206	/* Now read in the auxiliary header information */
207
208	retval = -ENOMEM;
209	size = som_ex->aux_header_size;
210	if (size > SOM_PAGESIZE)
211	goto out;
212	hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
213	if (!hpuxhdr)
214	goto out;
215
216	retval = kernel_read(bprm->file, som_ex->aux_header_location,
217	(char *) hpuxhdr, size);
218	if (retval < 0)
219	goto out_free;
220	#error "Fix security hole before enabling me"
221	retval = get_unused_fd();
222	if (retval < 0)
223	goto out_free;
224	get_file(bprm->file);
225	fd_install(som_exec_fileno = retval, bprm->file);
226
227	/* Flush all traces of the currently running executable */
228	retval = flush_old_exec(bprm);
229	if (retval)
230	goto out_free;
231
232	/* OK, This is the point of no return */
233	current->flags &= ~PF_FORKNOEXEC;
234	current->personality = PER_HPUX;
235
236	/* Set the task size for HP-UX processes such that
237	* the gateway page is outside the address space.
238	* This can be fixed later, but for now, this is much
239	* easier.
240	*/
241
242	current->thread.task_size = 0xc0000000;
243
244	/* Set map base to allow enough room for hp-ux heap growth */
245
246	current->thread.map_base = 0x80000000;
247
248	retval = map_som_binary(bprm->file, hpuxhdr);
249	if (retval < 0)
250	goto out_free;
251
252	som_entry = hpuxhdr->exec_entry;
253	kfree(hpuxhdr);
254
255	set_binfmt(&som_format);
256	compute_creds(bprm);
257	setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
258
259	create_som_tables(bprm);
260
261	current->mm->start_stack = bprm->p;
262	set_mm_counter(current->mm, rss, 0);
263
264	#if 0
265	printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
266	printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
267	printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
268	printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
269	printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
270	printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
271	#endif
272
273	map_hpux_gateway_page(current,current->mm);
274
275	start_thread_som(regs, som_entry, bprm->p);
276	if (current->ptrace & PT_PTRACED)
277	send_sig(SIGTRAP, current, 0);
278	return 0;
279
280	/* error cleanup */
281	out_free:
282	kfree(hpuxhdr);
283	out:
284	return retval;
285	}
286
287	static int load_som_library(struct file *f)
288	{
289	/* No lib support in SOM yet. gizza chance.. */
290	return -ENOEXEC;
291	}
292	/* Install the SOM loader.
293	* N.B. We rely on the table being the right size with the
294	* right number of free slots...
295	*/
296
297	static int __init init_som_binfmt(void)
298	{
299	return register_binfmt(&som_format);
300	}
301
302	static void __exit exit_som_binfmt(void)
303	{
304	/* Remove the SOM loader. */
305	unregister_binfmt(&som_format);
306	}
307
308	core_initcall(init_som_binfmt);
309	module_exit(exit_som_binfmt);