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1.1.1.3 root 1: /* Code for loading Linux executables. Mostly linux kernel code. */
1.1 root 2:
3: #include <sys/types.h>
4: #include <sys/stat.h>
5: #include <fcntl.h>
6: #include <errno.h>
7: #include <unistd.h>
8: #include <stdio.h>
9: #include <stdlib.h>
10:
11: #include "qemu.h"
12:
13: #define NGROUPS 32
14:
15: /* ??? This should really be somewhere else. */
1.1.1.3 root 16: abi_long memcpy_to_target(abi_ulong dest, const void *src,
17: unsigned long len)
1.1 root 18: {
19: void *host_ptr;
20:
1.1.1.3 root 21: host_ptr = lock_user(VERIFY_WRITE, dest, len, 0);
22: if (!host_ptr)
23: return -TARGET_EFAULT;
1.1 root 24: memcpy(host_ptr, src, len);
25: unlock_user(host_ptr, dest, 1);
1.1.1.3 root 26: return 0;
1.1 root 27: }
28:
29: static int count(char ** vec)
30: {
31: int i;
32:
33: for(i = 0; *vec; i++) {
34: vec++;
35: }
36:
37: return(i);
38: }
39:
40: static int prepare_binprm(struct linux_binprm *bprm)
41: {
42: struct stat st;
43: int mode;
1.1.1.8 ! root 44: int retval;
1.1 root 45:
46: if(fstat(bprm->fd, &st) < 0) {
47: return(-errno);
48: }
49:
50: mode = st.st_mode;
51: if(!S_ISREG(mode)) { /* Must be regular file */
52: return(-EACCES);
53: }
54: if(!(mode & 0111)) { /* Must have at least one execute bit set */
55: return(-EACCES);
56: }
57:
58: bprm->e_uid = geteuid();
59: bprm->e_gid = getegid();
60:
61: /* Set-uid? */
62: if(mode & S_ISUID) {
63: bprm->e_uid = st.st_uid;
64: }
65:
66: /* Set-gid? */
67: /*
68: * If setgid is set but no group execute bit then this
69: * is a candidate for mandatory locking, not a setgid
70: * executable.
71: */
72: if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
73: bprm->e_gid = st.st_gid;
74: }
75:
1.1.1.7 root 76: retval = read(bprm->fd, bprm->buf, BPRM_BUF_SIZE);
77: if (retval < 0) {
1.1 root 78: perror("prepare_binprm");
79: exit(-1);
80: }
1.1.1.7 root 81: if (retval < BPRM_BUF_SIZE) {
82: /* Make sure the rest of the loader won't read garbage. */
83: memset(bprm->buf + retval, 0, BPRM_BUF_SIZE - retval);
1.1 root 84: }
1.1.1.7 root 85: return retval;
1.1 root 86: }
87:
88: /* Construct the envp and argv tables on the target stack. */
1.1.1.3 root 89: abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
90: abi_ulong stringp, int push_ptr)
1.1 root 91: {
1.1.1.4 root 92: TaskState *ts = (TaskState *)thread_env->opaque;
1.1.1.3 root 93: int n = sizeof(abi_ulong);
94: abi_ulong envp;
95: abi_ulong argv;
1.1 root 96:
97: sp -= (envc + 1) * n;
98: envp = sp;
99: sp -= (argc + 1) * n;
100: argv = sp;
101: if (push_ptr) {
1.1.1.3 root 102: /* FIXME - handle put_user() failures */
103: sp -= n;
104: put_user_ual(envp, sp);
105: sp -= n;
106: put_user_ual(argv, sp);
107: }
108: sp -= n;
109: /* FIXME - handle put_user() failures */
110: put_user_ual(argc, sp);
1.1.1.4 root 111: ts->info->arg_start = stringp;
1.1 root 112: while (argc-- > 0) {
1.1.1.3 root 113: /* FIXME - handle put_user() failures */
114: put_user_ual(stringp, argv);
115: argv += n;
1.1 root 116: stringp += target_strlen(stringp) + 1;
117: }
1.1.1.4 root 118: ts->info->arg_end = stringp;
1.1.1.3 root 119: /* FIXME - handle put_user() failures */
120: put_user_ual(0, argv);
1.1 root 121: while (envc-- > 0) {
1.1.1.3 root 122: /* FIXME - handle put_user() failures */
123: put_user_ual(stringp, envp);
124: envp += n;
1.1 root 125: stringp += target_strlen(stringp) + 1;
126: }
1.1.1.3 root 127: /* FIXME - handle put_user() failures */
128: put_user_ual(0, envp);
1.1 root 129:
130: return sp;
131: }
132:
1.1.1.3 root 133: int loader_exec(const char * filename, char ** argv, char ** envp,
1.1.1.4 root 134: struct target_pt_regs * regs, struct image_info *infop,
135: struct linux_binprm *bprm)
1.1 root 136: {
137: int retval;
138: int i;
139:
1.1.1.4 root 140: bprm->p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
1.1.1.7 root 141: memset(bprm->page, 0, sizeof(bprm->page));
1.1 root 142: retval = open(filename, O_RDONLY);
143: if (retval < 0)
144: return retval;
1.1.1.4 root 145: bprm->fd = retval;
146: bprm->filename = (char *)filename;
147: bprm->argc = count(argv);
148: bprm->argv = argv;
149: bprm->envc = count(envp);
150: bprm->envp = envp;
1.1 root 151:
1.1.1.4 root 152: retval = prepare_binprm(bprm);
1.1 root 153:
154: if(retval>=0) {
1.1.1.4 root 155: if (bprm->buf[0] == 0x7f
156: && bprm->buf[1] == 'E'
157: && bprm->buf[2] == 'L'
158: && bprm->buf[3] == 'F') {
1.1.1.6 root 159: retval = load_elf_binary(bprm, regs, infop);
1.1 root 160: #if defined(TARGET_HAS_BFLT)
1.1.1.4 root 161: } else if (bprm->buf[0] == 'b'
162: && bprm->buf[1] == 'F'
163: && bprm->buf[2] == 'L'
164: && bprm->buf[3] == 'T') {
165: retval = load_flt_binary(bprm,regs,infop);
1.1 root 166: #endif
167: } else {
168: fprintf(stderr, "Unknown binary format\n");
169: return -1;
170: }
171: }
1.1.1.3 root 172:
1.1 root 173: if(retval>=0) {
174: /* success. Initialize important registers */
175: do_init_thread(regs, infop);
176: return retval;
177: }
178:
179: /* Something went wrong, return the inode and free the argument pages*/
180: for (i=0 ; i<MAX_ARG_PAGES ; i++) {
1.1.1.4 root 181: free(bprm->page[i]);
1.1 root 182: }
183: return(retval);
184: }
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