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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | /* * linux/fs/binfmt_java.c * * Copyright (C) 1996 Brian A. Lantz * derived from binfmt_script.c * * Simplified and modified to support binary java interpreters * by Tom May <ftom@netcom.com>. */ #include <linux/module.h> #include <linux/string.h> #include <linux/stat.h> #include <linux/malloc.h> #include <linux/binfmts.h> #include <linux/init.h> #define _PATH_JAVA "/usr/bin/java" #define _PATH_APPLET "/usr/bin/appletviewer" /* These paths can be modified with sysctl(). */ char binfmt_java_interpreter[65] = _PATH_JAVA; char binfmt_java_appletviewer[65] = _PATH_APPLET; static int do_load_java(struct linux_binprm *bprm,struct pt_regs *regs) { char *i_name; int len; int retval; struct dentry * dentry; unsigned char *ucp = (unsigned char *) bprm->buf; if ((ucp[0] != 0xca) || (ucp[1] != 0xfe) || (ucp[2] != 0xba) || (ucp[3] != 0xbe)) return -ENOEXEC; /* * Fail if we're called recursively, e.g., the Java interpreter * is a java binary. */ if (bprm->java) return -ENOEXEC; bprm->java = 1; dput(bprm->dentry); bprm->dentry = NULL; /* * Set args: [0] the name of the java interpreter * [1] name of java class to execute, which is the * filename without the path and without trailing * ".class". Note that the interpreter will use * its own way to found the class file (typically using * environment variable CLASSPATH), and may in fact * execute a different file from the one we want. * * This is done in reverse order, because of how the * user environment and arguments are stored. */ remove_arg_zero(bprm); len = strlen (bprm->filename); if (len >= 6 && !strcmp (bprm->filename + len - 6, ".class")) bprm->filename[len - 6] = 0; if ((i_name = strrchr (bprm->filename, '/')) != NULL) i_name++; else i_name = bprm->filename; bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2); bprm->argc++; i_name = binfmt_java_interpreter; bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2); bprm->argc++; if (!bprm->p) return -E2BIG; /* * OK, now restart the process with the interpreter's dentry. */ bprm->filename = binfmt_java_interpreter; dentry = open_namei(binfmt_java_interpreter, 0, 0); retval = PTR_ERR(dentry); if (IS_ERR(dentry)) return retval; bprm->dentry = dentry; retval = prepare_binprm(bprm); if (retval < 0) return retval; return search_binary_handler(bprm,regs); } static int do_load_applet(struct linux_binprm *bprm,struct pt_regs *regs) { char *i_name; struct dentry * dentry; int retval; if (strncmp (bprm->buf, "<!--applet", 10)) return -ENOEXEC; dput(bprm->dentry); bprm->dentry = NULL; /* * Set args: [0] the name of the appletviewer * [1] filename of html file * * This is done in reverse order, because of how the * user environment and arguments are stored. */ remove_arg_zero(bprm); i_name = bprm->filename; bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2); bprm->argc++; i_name = binfmt_java_appletviewer; bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2); bprm->argc++; if (!bprm->p) return -E2BIG; /* * OK, now restart the process with the interpreter's dentry. */ bprm->filename = binfmt_java_appletviewer; dentry = open_namei(binfmt_java_appletviewer, 0, 0); retval = PTR_ERR(dentry); if (IS_ERR(dentry)) return retval; bprm->dentry = dentry; retval = prepare_binprm(bprm); if (retval < 0) return retval; return search_binary_handler(bprm,regs); } static int load_java(struct linux_binprm *bprm,struct pt_regs *regs) { int retval; MOD_INC_USE_COUNT; retval = do_load_java(bprm,regs); MOD_DEC_USE_COUNT; return retval; } static struct linux_binfmt java_format = { #ifndef MODULE NULL, 0, load_java, NULL, NULL #else NULL, &__this_module, load_java, NULL, NULL #endif }; static int load_applet(struct linux_binprm *bprm,struct pt_regs *regs) { int retval; MOD_INC_USE_COUNT; retval = do_load_applet(bprm,regs); MOD_DEC_USE_COUNT; return retval; } static struct linux_binfmt applet_format = { #ifndef MODULE NULL, 0, load_applet, NULL, NULL #else NULL, &__this_module, load_applet, NULL, NULL #endif }; int __init init_java_binfmt(void) { register_binfmt(&java_format); return register_binfmt(&applet_format); } #ifdef MODULE int init_module(void) { return init_java_binfmt(); } void cleanup_module( void) { unregister_binfmt(&java_format); unregister_binfmt(&applet_format); } #endif |