ia64/linux-2.6.18-xen.hg

view fs/binfmt_som.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 <willy@bofh.ai>
8 * based on binfmt_elf which is
9 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
10 */
12 #include <linux/module.h>
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>
32 #include <asm/uaccess.h>
33 #include <asm/pgtable.h>
36 #include <linux/elf.h>
38 static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
39 static int load_som_library(struct file *);
41 /*
42 * If we don't support core dumping, then supply a NULL so we
43 * don't even try.
44 */
45 #if 0
46 static int som_core_dump(long signr, struct pt_regs * regs);
47 #else
48 #define som_core_dump NULL
49 #endif
51 #define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
52 #define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
53 #define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
55 static struct linux_binfmt som_format = {
56 .module = THIS_MODULE,
57 .load_binary = load_som_binary,
58 .load_shlib = load_som_library,
59 .core_dump = som_core_dump,
60 .min_coredump = SOM_PAGESIZE
61 };
63 /*
64 * create_som_tables() parses the env- and arg-strings in new user
65 * memory and creates the pointer tables from them, and puts their
66 * addresses on the "stack", returning the new stack pointer value.
67 */
68 static void create_som_tables(struct linux_binprm *bprm)
69 {
70 char **argv, **envp;
71 int argc = bprm->argc;
72 int envc = bprm->envc;
73 unsigned long p;
74 unsigned long *sp;
76 /* Word-align the stack pointer */
77 sp = (unsigned long *)((bprm->p + 3) & ~3);
79 envp = (char **) sp;
80 sp += envc + 1;
81 argv = (char **) sp;
82 sp += argc + 1;
84 __put_user((unsigned long) envp,++sp);
85 __put_user((unsigned long) argv,++sp);
87 __put_user(argc, ++sp);
89 bprm->p = (unsigned long) sp;
91 p = current->mm->arg_start;
92 while (argc-- > 0) {
93 __put_user((char *)p,argv++);
94 p += strlen_user((char *)p);
95 }
96 __put_user(NULL, argv);
97 current->mm->arg_end = current->mm->env_start = p;
98 while (envc-- > 0) {
99 __put_user((char *)p,envp++);
100 p += strlen_user((char *)p);
101 }
102 __put_user(NULL, envp);
103 current->mm->env_end = p;
104 }
106 static int check_som_header(struct som_hdr *som_ex)
107 {
108 int *buf = (int *)som_ex;
109 int i, ck;
111 if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
112 som_ex->system_id != SOM_SID_PARISC_1_1 &&
113 som_ex->system_id != SOM_SID_PARISC_2_0)
114 return -ENOEXEC;
116 if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
117 som_ex->a_magic != SOM_EXEC_SHARE &&
118 som_ex->a_magic != SOM_EXEC_DEMAND)
119 return -ENOEXEC;
121 if (som_ex->version_id != SOM_ID_OLD &&
122 som_ex->version_id != SOM_ID_NEW)
123 return -ENOEXEC;
125 ck = 0;
126 for (i=0; i<32; i++)
127 ck ^= buf[i];
128 if (ck != 0)
129 return -ENOEXEC;
131 return 0;
132 }
134 static int map_som_binary(struct file *file,
135 const struct som_exec_auxhdr *hpuxhdr)
136 {
137 unsigned long code_start, code_size, data_start, data_size;
138 unsigned long bss_start, som_brk;
139 int retval;
140 int prot = PROT_READ | PROT_EXEC;
141 int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
143 mm_segment_t old_fs = get_fs();
144 set_fs(get_ds());
146 code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
147 code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
148 current->mm->start_code = code_start;
149 current->mm->end_code = code_start + code_size;
150 down_write(&current->mm->mmap_sem);
151 retval = do_mmap(file, code_start, code_size, prot,
152 flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
153 up_write(&current->mm->mmap_sem);
154 if (retval < 0 && retval > -1024)
155 goto out;
157 data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
158 data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
159 current->mm->start_data = data_start;
160 current->mm->end_data = bss_start = data_start + data_size;
161 down_write(&current->mm->mmap_sem);
162 retval = do_mmap(file, data_start, data_size,
163 prot | PROT_WRITE, flags,
164 SOM_PAGESTART(hpuxhdr->exec_dfile));
165 up_write(&current->mm->mmap_sem);
166 if (retval < 0 && retval > -1024)
167 goto out;
169 som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
170 current->mm->start_brk = current->mm->brk = som_brk;
171 down_write(&current->mm->mmap_sem);
172 retval = do_mmap(NULL, bss_start, som_brk - bss_start,
173 prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
174 up_write(&current->mm->mmap_sem);
175 if (retval > 0 || retval < -1024)
176 retval = 0;
177 out:
178 set_fs(old_fs);
179 return retval;
180 }
183 /*
184 * These are the functions used to load SOM executables and shared
185 * libraries. There is no binary dependent code anywhere else.
186 */
188 static int
189 load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
190 {
191 int som_exec_fileno;
192 int retval;
193 unsigned int size;
194 unsigned long som_entry;
195 struct som_hdr *som_ex;
196 struct som_exec_auxhdr *hpuxhdr;
198 /* Get the exec-header */
199 som_ex = (struct som_hdr *) bprm->buf;
201 retval = check_som_header(som_ex);
202 if (retval != 0)
203 goto out;
205 /* Now read in the auxiliary header information */
207 retval = -ENOMEM;
208 size = som_ex->aux_header_size;
209 if (size > SOM_PAGESIZE)
210 goto out;
211 hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
212 if (!hpuxhdr)
213 goto out;
215 retval = kernel_read(bprm->file, som_ex->aux_header_location,
216 (char *) hpuxhdr, size);
217 if (retval < 0)
218 goto out_free;
219 #error "Fix security hole before enabling me"
220 retval = get_unused_fd();
221 if (retval < 0)
222 goto out_free;
223 get_file(bprm->file);
224 fd_install(som_exec_fileno = retval, bprm->file);
226 /* Flush all traces of the currently running executable */
227 retval = flush_old_exec(bprm);
228 if (retval)
229 goto out_free;
231 /* OK, This is the point of no return */
232 current->flags &= ~PF_FORKNOEXEC;
233 current->personality = PER_HPUX;
235 /* Set the task size for HP-UX processes such that
236 * the gateway page is outside the address space.
237 * This can be fixed later, but for now, this is much
238 * easier.
239 */
241 current->thread.task_size = 0xc0000000;
243 /* Set map base to allow enough room for hp-ux heap growth */
245 current->thread.map_base = 0x80000000;
247 retval = map_som_binary(bprm->file, hpuxhdr);
248 if (retval < 0)
249 goto out_free;
251 som_entry = hpuxhdr->exec_entry;
252 kfree(hpuxhdr);
254 set_binfmt(&som_format);
255 compute_creds(bprm);
256 setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
258 create_som_tables(bprm);
260 current->mm->start_stack = bprm->p;
262 #if 0
263 printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
264 printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
265 printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
266 printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
267 printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
268 printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
269 #endif
271 map_hpux_gateway_page(current,current->mm);
273 start_thread_som(regs, som_entry, bprm->p);
274 if (current->ptrace & PT_PTRACED)
275 send_sig(SIGTRAP, current, 0);
276 return 0;
278 /* error cleanup */
279 out_free:
280 kfree(hpuxhdr);
281 out:
282 return retval;
283 }
285 static int load_som_library(struct file *f)
286 {
287 /* No lib support in SOM yet. gizza chance.. */
288 return -ENOEXEC;
289 }
290 /* Install the SOM loader.
291 * N.B. We *rely* on the table being the right size with the
292 * right number of free slots...
293 */
295 static int __init init_som_binfmt(void)
296 {
297 return register_binfmt(&som_format);
298 }
300 static void __exit exit_som_binfmt(void)
301 {
302 /* Remove the SOM loader. */
303 unregister_binfmt(&som_format);
304 }
306 core_initcall(init_som_binfmt);
307 module_exit(exit_som_binfmt);