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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/binfmt_em86.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/binfmt_em86.c')
-rw-r--r--fs/binfmt_em86.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/fs/binfmt_em86.c b/fs/binfmt_em86.c
new file mode 100644
index 000000000000..1f2d1ad63319
--- /dev/null
+++ b/fs/binfmt_em86.c
@@ -0,0 +1,115 @@
1/*
2 * linux/fs/binfmt_em86.c
3 *
4 * Based on linux/fs/binfmt_script.c
5 * Copyright (C) 1996 Martin von Löwis
6 * original #!-checking implemented by tytso.
7 *
8 * em86 changes Copyright (C) 1997 Jim Paradis
9 */
10
11#include <linux/module.h>
12#include <linux/string.h>
13#include <linux/stat.h>
14#include <linux/slab.h>
15#include <linux/smp_lock.h>
16#include <linux/binfmts.h>
17#include <linux/elf.h>
18#include <linux/init.h>
19#include <linux/fs.h>
20#include <linux/file.h>
21#include <linux/errno.h>
22
23
24#define EM86_INTERP "/usr/bin/em86"
25#define EM86_I_NAME "em86"
26
27static int load_em86(struct linux_binprm *bprm,struct pt_regs *regs)
28{
29 char *interp, *i_name, *i_arg;
30 struct file * file;
31 int retval;
32 struct elfhdr elf_ex;
33
34 /* Make sure this is a Linux/Intel ELF executable... */
35 elf_ex = *((struct elfhdr *)bprm->buf);
36
37 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
38 return -ENOEXEC;
39
40 /* First of all, some simple consistency checks */
41 if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
42 (!((elf_ex.e_machine == EM_386) || (elf_ex.e_machine == EM_486))) ||
43 (!bprm->file->f_op || !bprm->file->f_op->mmap)) {
44 return -ENOEXEC;
45 }
46
47 bprm->sh_bang++; /* Well, the bang-shell is implicit... */
48 allow_write_access(bprm->file);
49 fput(bprm->file);
50 bprm->file = NULL;
51
52 /* Unlike in the script case, we don't have to do any hairy
53 * parsing to find our interpreter... it's hardcoded!
54 */
55 interp = EM86_INTERP;
56 i_name = EM86_I_NAME;
57 i_arg = NULL; /* We reserve the right to add an arg later */
58
59 /*
60 * Splice in (1) the interpreter's name for argv[0]
61 * (2) (optional) argument to interpreter
62 * (3) filename of emulated file (replace argv[0])
63 *
64 * This is done in reverse order, because of how the
65 * user environment and arguments are stored.
66 */
67 remove_arg_zero(bprm);
68 retval = copy_strings_kernel(1, &bprm->filename, bprm);
69 if (retval < 0) return retval;
70 bprm->argc++;
71 if (i_arg) {
72 retval = copy_strings_kernel(1, &i_arg, bprm);
73 if (retval < 0) return retval;
74 bprm->argc++;
75 }
76 retval = copy_strings_kernel(1, &i_name, bprm);
77 if (retval < 0) return retval;
78 bprm->argc++;
79
80 /*
81 * OK, now restart the process with the interpreter's inode.
82 * Note that we use open_exec() as the name is now in kernel
83 * space, and we don't need to copy it.
84 */
85 file = open_exec(interp);
86 if (IS_ERR(file))
87 return PTR_ERR(file);
88
89 bprm->file = file;
90
91 retval = prepare_binprm(bprm);
92 if (retval < 0)
93 return retval;
94
95 return search_binary_handler(bprm, regs);
96}
97
98static struct linux_binfmt em86_format = {
99 .module = THIS_MODULE,
100 .load_binary = load_em86,
101};
102
103static int __init init_em86_binfmt(void)
104{
105 return register_binfmt(&em86_format);
106}
107
108static void __exit exit_em86_binfmt(void)
109{
110 unregister_binfmt(&em86_format);
111}
112
113core_initcall(init_em86_binfmt);
114module_exit(exit_em86_binfmt);
115MODULE_LICENSE("GPL");