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author | root <root@artemis.panaceas.org> | 2015-12-25 04:40:36 +0000 |
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committer | root <root@artemis.panaceas.org> | 2015-12-25 04:40:36 +0000 |
commit | 849369d6c66d3054688672f97d31fceb8e8230fb (patch) | |
tree | 6135abc790ca67dedbe07c39806591e70eda81ce /fs/binfmt_script.c | |
download | linux-3.0.35-kobo-849369d6c66d3054688672f97d31fceb8e8230fb.tar.gz linux-3.0.35-kobo-849369d6c66d3054688672f97d31fceb8e8230fb.tar.bz2 linux-3.0.35-kobo-849369d6c66d3054688672f97d31fceb8e8230fb.zip |
initial_commit
Diffstat (limited to 'fs/binfmt_script.c')
-rw-r--r-- | fs/binfmt_script.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c new file mode 100644 index 00000000..396a9884 --- /dev/null +++ b/fs/binfmt_script.c @@ -0,0 +1,118 @@ +/* + * linux/fs/binfmt_script.c + * + * Copyright (C) 1996 Martin von Löwis + * original #!-checking implemented by tytso. + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/stat.h> +#include <linux/binfmts.h> +#include <linux/init.h> +#include <linux/file.h> +#include <linux/err.h> +#include <linux/fs.h> + +static int load_script(struct linux_binprm *bprm,struct pt_regs *regs) +{ + const char *i_arg, *i_name; + char *cp; + struct file *file; + char interp[BINPRM_BUF_SIZE]; + int retval; + + if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!') || + (bprm->recursion_depth > BINPRM_MAX_RECURSION)) + return -ENOEXEC; + /* + * This section does the #! interpretation. + * Sorta complicated, but hopefully it will work. -TYT + */ + + bprm->recursion_depth++; + allow_write_access(bprm->file); + fput(bprm->file); + bprm->file = NULL; + + bprm->buf[BINPRM_BUF_SIZE - 1] = '\0'; + if ((cp = strchr(bprm->buf, '\n')) == NULL) + cp = bprm->buf+BINPRM_BUF_SIZE-1; + *cp = '\0'; + while (cp > bprm->buf) { + cp--; + if ((*cp == ' ') || (*cp == '\t')) + *cp = '\0'; + else + break; + } + for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++); + if (*cp == '\0') + return -ENOEXEC; /* No interpreter name found */ + i_name = cp; + i_arg = NULL; + for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++) + /* nothing */ ; + while ((*cp == ' ') || (*cp == '\t')) + *cp++ = '\0'; + if (*cp) + i_arg = cp; + strcpy (interp, i_name); + /* + * OK, we've parsed out the interpreter name and + * (optional) argument. + * Splice in (1) the interpreter's name for argv[0] + * (2) (optional) argument to interpreter + * (3) filename of shell script (replace argv[0]) + * + * This is done in reverse order, because of how the + * user environment and arguments are stored. + */ + retval = remove_arg_zero(bprm); + if (retval) + return retval; + retval = copy_strings_kernel(1, &bprm->interp, bprm); + if (retval < 0) return retval; + bprm->argc++; + if (i_arg) { + retval = copy_strings_kernel(1, &i_arg, bprm); + if (retval < 0) return retval; + bprm->argc++; + } + retval = copy_strings_kernel(1, &i_name, bprm); + if (retval) return retval; + bprm->argc++; + bprm->interp = interp; + + /* + * OK, now restart the process with the interpreter's dentry. + */ + file = open_exec(interp); + if (IS_ERR(file)) + return PTR_ERR(file); + + bprm->file = file; + retval = prepare_binprm(bprm); + if (retval < 0) + return retval; + return search_binary_handler(bprm,regs); +} + +static struct linux_binfmt script_format = { + .module = THIS_MODULE, + .load_binary = load_script, +}; + +static int __init init_script_binfmt(void) +{ + return register_binfmt(&script_format); +} + +static void __exit exit_script_binfmt(void) +{ + unregister_binfmt(&script_format); +} + +core_initcall(init_script_binfmt); +module_exit(exit_script_binfmt); +MODULE_LICENSE("GPL"); |