binfmt_som.c

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    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  */
   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         NULL, THIS_MODULE, load_som_binary, load_som_library, som_core_dump, SOM_PAGESIZE
   58 };
   59 
   60 /*
   61  * create_som_tables() parses the env- and arg-strings in new user
   62  * memory and creates the pointer tables from them, and puts their
   63  * addresses on the "stack", returning the new stack pointer value.
   64  */
   65 static void create_som_tables(struct linux_binprm *bprm)
   66 {
   67         char **argv, **envp;
   68         int argc = bprm->argc;
   69         int envc = bprm->envc;
   70         unsigned long p;
   71         unsigned long *sp;
   72 
   73         /* Word-align the stack pointer */
   74         sp = (unsigned long *)((bprm->p + 3) & ~3);
   75 
   76         envp = (char **) sp;
   77         sp += envc + 1;
   78         argv = (char **) sp;
   79         sp += argc + 1;
   80 
   81         __put_user((unsigned long) envp,++sp);
   82         __put_user((unsigned long) argv,++sp);
   83 
   84         __put_user(argc, ++sp);
   85 
   86         bprm->p = (unsigned long) sp;
   87 
   88         p = current->mm->arg_start;
   89         while (argc-- > 0) {
   90                 __put_user((char *)p,argv++);
   91                 p += strlen_user((char *)p);
   92         }
   93         __put_user(NULL, argv);
   94         current->mm->arg_end = current->mm->env_start = p;
   95         while (envc-- > 0) {
   96                 __put_user((char *)p,envp++);
   97                 p += strlen_user((char *)p);
   98         }
   99         __put_user(NULL, envp);
  100         current->mm->env_end = p;
  101 }
  102 
  103 static int check_som_header(struct som_hdr *som_ex)
  104 {
  105         int *buf = (int *)som_ex;
  106         int i, ck;
  107 
  108         if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
  109             som_ex->system_id != SOM_SID_PARISC_1_1 &&
  110             som_ex->system_id != SOM_SID_PARISC_2_0)
  111                 return -ENOEXEC;
  112 
  113         if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
  114             som_ex->a_magic != SOM_EXEC_SHARE &&
  115             som_ex->a_magic != SOM_EXEC_DEMAND)
  116                 return -ENOEXEC;
  117 
  118         if (som_ex->version_id != SOM_ID_OLD &&
  119             som_ex->version_id != SOM_ID_NEW)
  120                 return -ENOEXEC;
  121 
  122         ck = 0;
  123         for (i=0; i<32; i++)
  124                 ck ^= buf[i];
  125         if (ck != 0)
  126                 return -ENOEXEC;
  127 
  128         return 0;
  129 }
  130 
  131 static int map_som_binary(struct file *file,
  132                 const struct som_exec_auxhdr *hpuxhdr)
  133 {
  134         unsigned long code_start, code_size, data_start, data_size;
  135         unsigned long bss_start, som_brk;
  136         int retval;
  137         int prot = PROT_READ | PROT_EXEC;
  138         int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
  139 
  140         mm_segment_t old_fs = get_fs();
  141         set_fs(get_ds());
  142 
  143         code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
  144         code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
  145         current->mm->start_code = code_start;
  146         current->mm->end_code = code_start + code_size;
  147         down_write(&current->mm->mmap_sem);
  148         retval = do_mmap(file, code_start, code_size, prot,
  149                         flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
  150         up_write(&current->mm->mmap_sem);
  151         if (retval < 0 && retval > -1024)
  152                 goto out;
  153 
  154         data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
  155         data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
  156         current->mm->start_data = data_start;
  157         current->mm->end_data = bss_start = data_start + data_size;
  158         down_write(&current->mm->mmap_sem);
  159         retval = do_mmap(file, data_start, data_size,
  160                         prot | PROT_WRITE, flags,
  161                         SOM_PAGESTART(hpuxhdr->exec_dfile));
  162         up_write(&current->mm->mmap_sem);
  163         if (retval < 0 && retval > -1024)
  164                 goto out;
  165 
  166         som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
  167         current->mm->start_brk = current->mm->brk = som_brk;
  168         down_write(&current->mm->mmap_sem);
  169         retval = do_mmap(NULL, bss_start, som_brk - bss_start,
  170                         prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
  171         up_write(&current->mm->mmap_sem);
  172         if (retval > 0 || retval < -1024)
  173                 retval = 0;
  174 out:
  175         set_fs(old_fs);
  176         return retval;
  177 }
  178 
  179 
  180 /*
  181  * These are the functions used to load SOM executables and shared
  182  * libraries.  There is no binary dependent code anywhere else.
  183  */
  184 
  185 static inline int
  186 do_load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
  187 {
  188         int som_exec_fileno;
  189         int retval;
  190         unsigned int size;
  191         unsigned long som_entry;
  192         struct som_hdr *som_ex;
  193         struct som_exec_auxhdr *hpuxhdr;
  194 
  195         /* Get the exec-header */
  196         som_ex = (struct som_hdr *) bprm->buf;
  197 
  198         retval = check_som_header(som_ex);
  199         if (retval != 0)
  200                 goto out;
  201 
  202         /* Now read in the auxiliary header information */
  203 
  204         retval = -ENOMEM;
  205         size = som_ex->aux_header_size;
  206         if (size > SOM_PAGESIZE)
  207                 goto out;
  208         hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
  209         if (!hpuxhdr)
  210                 goto out;
  211 
  212         retval = kernel_read(bprm->file, som_ex->aux_header_location,
  213                         (char *) hpuxhdr, size);
  214         if (retval < 0)
  215                 goto out_free;
  216 #error "Fix security hole before enabling me"
  217         retval = get_unused_fd();
  218         if (retval < 0)
  219                 goto out_free;
  220         get_file(bprm->file);
  221         fd_install(som_exec_fileno = retval, bprm->file);
  222 
  223         /* Flush all traces of the currently running executable */
  224         retval = flush_old_exec(bprm);
  225         if (retval)
  226                 goto out_free;
  227 
  228         /* OK, This is the point of no return */
  229         current->flags &= ~PF_FORKNOEXEC;
  230         current->personality = PER_HPUX;
  231 
  232         /* Set the task size for HP-UX processes such that
  233          * the gateway page is outside the address space.
  234          * This can be fixed later, but for now, this is much
  235          * easier.
  236          */
  237 
  238         current->thread.task_size = 0xc0000000;
  239 
  240         /* Set map base to allow enough room for hp-ux heap growth */
  241 
  242         current->thread.map_base = 0x80000000;
  243 
  244         retval = map_som_binary(bprm->file, hpuxhdr);
  245         if (retval < 0)
  246                 goto out_free;
  247 
  248         som_entry = hpuxhdr->exec_entry;
  249         kfree(hpuxhdr);
  250 
  251         set_binfmt(&som_format);
  252         compute_creds(bprm);
  253         setup_arg_pages(bprm);
  254 
  255         create_som_tables(bprm);
  256 
  257         current->mm->start_stack = bprm->p;
  258         current->mm->rss = 0;
  259 
  260 #if 0
  261         printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
  262         printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
  263         printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
  264         printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
  265         printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
  266         printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
  267 #endif
  268 
  269         map_hpux_gateway_page(current,current->mm);
  270 
  271         start_thread_som(regs, som_entry, bprm->p);
  272         if (current->ptrace & PT_PTRACED)
  273                 send_sig(SIGTRAP, current, 0);
  274         return 0;
  275 
  276         /* error cleanup */
  277 out_free:
  278         kfree(hpuxhdr);
  279 out:
  280         return retval;
  281 }
  282 
  283 static int
  284 load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
  285 {
  286         int retval;
  287 
  288         MOD_INC_USE_COUNT;
  289         retval = do_load_som_binary(bprm, regs);
  290         MOD_DEC_USE_COUNT;
  291         return retval;
  292 }
  293 
  294 static inline int
  295 do_load_som_library(struct file *f)
  296 {
  297 /* No lib support in SOM yet.  gizza chance.. */
  298         return -ENOEXEC;
  299 }
  300 
  301 static int load_som_library(struct file *f)
  302 {
  303         int retval;
  304 
  305         MOD_INC_USE_COUNT;
  306         retval = do_load_som_library(f);
  307         MOD_DEC_USE_COUNT;
  308         return retval;
  309 }
  310 
  311         /* Install the SOM loader.
  312          * N.B. We *rely* on the table being the right size with the
  313          * right number of free slots...
  314          */
  315 
  316 static int __init init_som_binfmt(void)
  317 {
  318         return register_binfmt(&som_format);
  319 }
  320 
  321 static void __exit exit_som_binfmt(void)
  322 {
  323         /* Remove the SOM loader. */
  324         unregister_binfmt(&som_format);
  325 }
  326 
  327 module_init(init_som_binfmt);
  328 module_exit(exit_som_binfmt);
  329
Cache object: 9df97837214d73b1a383afeda97719b6
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FreeBSD/Linux Kernel Cross Reference sys/fs/binfmt_som.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/binfmt_som.c
