Function imgact_binmisc_exec

freebsd/kern/imgact_binmisc.c:588–707

}

static int
imgact_binmisc_exec(struct image_params *imgp)
{
	const char *image_header = imgp->image_header;
	const char *fname = NULL;
	int error = 0;
#ifdef INVARIANTS
	int argv0_cnt = 0;
#endif
	size_t namelen, offset;
	imgact_binmisc_entry_t *ibe;
	struct sbuf *sname;
	char *s, *d;

	sname = NULL;
	namelen = 0;
	/* Do we have an interpreter for the given image header? */
	INTERP_LIST_RLOCK();
	if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) {
		error = -1;
		goto done;
	}

	/* No interpreter nesting allowed. */
	if (imgp->interpreted & IMGACT_BINMISC) {
		error = ENOEXEC;
		goto done;
	}

	imgp->interpreted |= IMGACT_BINMISC;

	/*
	 * Don't bother with the overhead of putting fname together if we're not
	 * using #a.
	 */
	if (ibe->ibe_argv0_cnt != 0) {
		if (imgp->args->fname != NULL) {
			fname = imgp->args->fname;
		} else {
			/* Use the fdescfs(5) path for fexecve(2). */
			sname = sbuf_new_auto();
			sbuf_printf(sname, "/dev/fd/%d", imgp->args->fd);
			sbuf_finish(sname);
			fname = sbuf_data(sname);
		}

		namelen = strlen(fname);
	}

	/*
	 * We need to "push" the interpreter in the arg[] list.  To do this,
	 * we first shift all the other values in the `begin_argv' area to
	 * provide the exact amount of room for the values added.  Set up
	 * `offset' as the number of bytes to be added to the `begin_argv'
	 * area.  ibe_interp_offset is the fixed offset from macros present in
	 * the interpreter string.
	 */
	offset = ibe->ibe_interp_length + ibe->ibe_interp_offset;