b6a2fea393
Remove the arg+env limit of MAX_ARG_PAGES by copying the strings directly from the old mm into the new mm. We create the new mm before the binfmt code runs, and place the new stack at the very top of the address space. Once the binfmt code runs and figures out where the stack should be, we move it downwards. It is a bit peculiar in that we have one task with two mm's, one of which is inactive. [a.p.zijlstra@chello.nl: limit stack size] Signed-off-by: Ollie Wild <aaw@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <linux-arch@vger.kernel.org> Cc: Hugh Dickins <hugh@veritas.com> [bunk@stusta.de: unexport bprm_mm_init] Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* linux/fs/binfmt_script.c
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*
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* Copyright (C) 1996 Martin von Löwis
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* original #!-checking implemented by tytso.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/binfmts.h>
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#include <linux/init.h>
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#include <linux/file.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)
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{
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char *cp, *i_name, *i_arg;
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struct file *file;
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char interp[BINPRM_BUF_SIZE];
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int retval;
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if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!') || (bprm->sh_bang))
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return -ENOEXEC;
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/*
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* This section does the #! interpretation.
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* Sorta complicated, but hopefully it will work. -TYT
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*/
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bprm->sh_bang++;
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allow_write_access(bprm->file);
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fput(bprm->file);
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bprm->file = NULL;
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bprm->buf[BINPRM_BUF_SIZE - 1] = '\0';
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if ((cp = strchr(bprm->buf, '\n')) == NULL)
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cp = bprm->buf+BINPRM_BUF_SIZE-1;
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*cp = '\0';
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while (cp > bprm->buf) {
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cp--;
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if ((*cp == ' ') || (*cp == '\t'))
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*cp = '\0';
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else
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break;
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}
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for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++);
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if (*cp == '\0')
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return -ENOEXEC; /* No interpreter name found */
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i_name = cp;
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i_arg = NULL;
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for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++)
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/* nothing */ ;
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while ((*cp == ' ') || (*cp == '\t'))
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*cp++ = '\0';
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if (*cp)
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i_arg = cp;
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strcpy (interp, i_name);
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/*
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* OK, we've parsed out the interpreter name and
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* (optional) argument.
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* Splice in (1) the interpreter's name for argv[0]
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* (2) (optional) argument to interpreter
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* (3) filename of shell script (replace argv[0])
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*
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* This is done in reverse order, because of how the
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* user environment and arguments are stored.
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*/
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retval = remove_arg_zero(bprm);
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if (retval)
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return retval;
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retval = copy_strings_kernel(1, &bprm->interp, bprm);
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if (retval < 0) return retval;
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bprm->argc++;
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if (i_arg) {
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retval = copy_strings_kernel(1, &i_arg, bprm);
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if (retval < 0) return retval;
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bprm->argc++;
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}
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retval = copy_strings_kernel(1, &i_name, bprm);
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if (retval) return retval;
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bprm->argc++;
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bprm->interp = interp;
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/*
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* OK, now restart the process with the interpreter's dentry.
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*/
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file = open_exec(interp);
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if (IS_ERR(file))
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return PTR_ERR(file);
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bprm->file = file;
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retval = prepare_binprm(bprm);
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if (retval < 0)
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return retval;
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return search_binary_handler(bprm,regs);
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}
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static struct linux_binfmt script_format = {
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.module = THIS_MODULE,
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.load_binary = load_script,
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};
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static int __init init_script_binfmt(void)
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{
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return register_binfmt(&script_format);
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}
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static void __exit exit_script_binfmt(void)
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{
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unregister_binfmt(&script_format);
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}
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core_initcall(init_script_binfmt);
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module_exit(exit_script_binfmt);
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MODULE_LICENSE("GPL");
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