Пример #1
0
static int sys_mkpipe(void) {
	fs_node_t * node = make_pipe(4096 * 2);
	open_fs(node, 0);
	int fd = process_append_fd((process_t *)current_process, node);
	FD_MODE(fd) = 03; /* read write */
	return fd;
}
Пример #2
0
int openpty(int * master, int * slave, char * name, void * _ign0, void * size) {
	/* We require a place to put these when we are done. */
	if (!master || !slave) return -1;
	if (validate_safe(master) || validate_safe(slave)) return -1;
	if (validate_safe(size)) return -1;

	/* Create a new pseudo terminal */
	pty_t * pty = pty_new(size);

	/* Append the master and slave to the calling process */
	*master = process_append_fd((process_t *)current_process, pty->master);
	*slave  = process_append_fd((process_t *)current_process, pty->slave);

	/* Return success */
	return 0;
}
Пример #3
0
static int sys_open(const char * file, int flags, int mode) {
    PTR_VALIDATE(file);
    debug_print(NOTICE, "open(%s) flags=0x%x; mode=0x%x", file, flags, mode);
    fs_node_t * node = kopen((char *)file, flags);
    if (!node && (flags & O_CREAT)) {
        debug_print(NOTICE, "- file does not exist and create was requested.");
        /* Um, make one */
        if (!create_file_fs((char *)file, mode)) {
            node = kopen((char *)file, flags);
        }
    }
    if (!node) {
        debug_print(NOTICE, "File does not exist; someone should be setting errno?");
        return -1;
    }
    node->offset = 0;
    int fd = process_append_fd((process_t *)current_process, node);
    debug_print(INFO, "[open] pid=%d %s -> %d", getpid(), file, fd);
    return fd;
}
Пример #4
0
static int sys_open(const char * file, int flags, int mode) {
	PTR_VALIDATE(file);
	debug_print(NOTICE, "open(%s) flags=0x%x; mode=0x%x", file, flags, mode);
	fs_node_t * node = kopen((char *)file, flags);

	if (node && !has_permission(node, 04)) {
		debug_print(WARNING, "access denied (read, sys_open, file=%s)", file);
		return -EACCES;
	}
	if (node && ((flags & O_RDWR) || (flags & O_APPEND) || (flags & O_WRONLY))) {
		if (!has_permission(node, 02)) {
			debug_print(WARNING, "access denied (write, sys_open, file=%s)", file);
			return -EACCES;
		}
	}

	if (!node && (flags & O_CREAT)) {
		/* TODO check directory permissions */
		debug_print(NOTICE, "- file does not exist and create was requested.");
		/* Um, make one */
		int result = create_file_fs((char *)file, mode);
		if (!result) {
			node = kopen((char *)file, flags);
		} else {
			return result;
		}
	}
	if (!node) {
		debug_print(NOTICE, "File does not exist; someone should be setting errno?");
		return -1;
	}
	node->offset = 0;
	int fd = process_append_fd((process_t *)current_process, node);
	debug_print(INFO, "[open] pid=%d %s -> %d", getpid(), file, fd);
	return fd;
}
Пример #5
0
static int sys_mkpipe(void) {
    fs_node_t * node = make_pipe(4096 * 2);
    open_fs(node, 0);
    return process_append_fd((process_t *)current_process, node);
}
Пример #6
0
/**
 * Load and execute a static ELF binary.
 *
 * We make one assumption on the location the binary expects to be loaded
 * at: that it be outside of the kernel memory space.
 *
 * Arguments are passed to the stack of the user application so that they
 * can be read properly.
 *
 * TODO: Environment variables should be loaded somewhere.
 *
 * HACK: ELF verification isn't complete.
 *
 * @param path Path to the executable to attempt to execute.
 * @param argc Number of arguments (because I'm not counting for you)
 * @param argv Pointer to a string of arguments
 */
int
exec(
    char *  path, /* Path to the executable to run */
    int     argc, /* Argument count (ie, /bin/echo hello world = 3) */
    char ** argv, /* Argument strings (including executable path) */
    char ** env   /* Environmen variables */
) {

    /* Open the file */
    fs_node_t * file = kopen(path,0);
    if (!file) {
        /* Command not found */
        return 0;
    }
    /* Read in the binary contents */
    for (uintptr_t x = 0x30000000; x < 0x30000000 + file->length; x += 0x1000) {
        alloc_frame(get_page(x, 1, current_directory), 0, 1);
    }
    Elf32_Header * header = (Elf32_Header *)0x30000000; //(Elf32_Header *)malloc(file->length + 100);
    read_fs(file, 0, file->length, (uint8_t *)header);

    current_process->name = malloc(strlen(path) + 1);
    memcpy(current_process->name, path, strlen(path) + 1);

    /* Alright, we've read the binary, time to load the loadable sections */
    /* Verify the magic */
    if (	header->e_ident[0] != ELFMAG0 ||
            header->e_ident[1] != ELFMAG1 ||
            header->e_ident[2] != ELFMAG2 ||
            header->e_ident[3] != ELFMAG3) {
        /* What? This isn't an ELF... */
        kprintf("Fatal: Not a valid ELF executable.\n");
        for (uintptr_t x = 0x30000000; x < 0x30000000 + file->length; x += 0x1000) {
            free_frame(get_page(x, 0, current_directory));
        }
        close_fs(file);
        return -1;
    }

    /* Load the loadable segments from the binary */
    for (uintptr_t x = 0; x < (uint32_t)header->e_shentsize * header->e_shnum; x += header->e_shentsize) {
        /* read a section header */
        Elf32_Shdr * shdr = (Elf32_Shdr *)((uintptr_t)header + (header->e_shoff + x));
        if (shdr->sh_addr) {
            /* If this is a loadable section, load it up. */
            if (shdr->sh_addr < current_process->image.entry) {
                /* If this is the lowest entry point, store it for memory reasons */
                current_process->image.entry = shdr->sh_addr;
            }
            if (shdr->sh_addr + shdr->sh_size - current_process->image.entry > current_process->image.size) {
                /* We also store the total size of the memory region used by the application */
                current_process->image.size = shdr->sh_addr + shdr->sh_size - current_process->image.entry;
            }
            for (uintptr_t i = 0; i < shdr->sh_size + 0x2000; i += 0x1000) {
                /* This doesn't care if we already allocated this page */
                alloc_frame(get_page(shdr->sh_addr + i, 1, current_directory), 0, 1);
            }
            if (shdr->sh_type == SHT_NOBITS) {
                /* This is the .bss, zero it */
                memset((void *)(shdr->sh_addr), 0x0, shdr->sh_size);
            } else {
                /* Copy the section into memory */
                memcpy((void *)(shdr->sh_addr), (void *)((uintptr_t)header + shdr->sh_offset), shdr->sh_size);
            }
        }
    }

    /* Store the entry point to the code segment */
    uintptr_t entry = (uintptr_t)header->e_entry;

    /* Free the space we used for the ELF headers and files */
    for (uintptr_t x = 0x30000000; x < 0x30000000 + file->length; x += 0x1000) {
        free_frame(get_page(x, 0, current_directory));
    }
    close_fs(file);

    for (uintptr_t stack_pointer = USER_STACK_BOTTOM; stack_pointer < USER_STACK_TOP; stack_pointer += 0x1000) {
        alloc_frame(get_page(stack_pointer, 1, current_directory), 0, 1);
    }

    /* Collect arguments */
    int envc = 0;
    for (envc = 0; env[envc] != NULL; ++envc);

    /* Format auxv */
    Elf32_auxv auxv[] = {
        {256, 0xDEADBEEF},
        {0, 0}
    };
    int auxvc = 0;
    for (auxvc = 0; auxv[auxvc].id != 0; ++auxvc);

    uintptr_t heap = current_process->image.entry + current_process->image.size;
    alloc_frame(get_page(heap, 1, current_directory), 0, 1);
    char ** argv_ = (char **)heap;
    heap += sizeof(char *) * (argc + 1);
    char ** env_ = (char **)heap;
    heap += sizeof(char *) * (envc + 1);
    void * auxv_ptr = (void *)heap;
    heap += sizeof(Elf32_auxv) * (auxvc);

    for (int i = 0; i < argc; ++i) {
        alloc_frame(get_page(heap, 1, current_directory), 0, 1);
        argv_[i] = (char *)heap;
        memcpy((void *)heap, argv[i], strlen(argv[i]) * sizeof(char) + 1);
        heap += strlen(argv[i]) + 1;
    }
    /* Don't forget the NULL at the end of that... */
    argv_[argc] = 0;

    for (int i = 0; i < envc; ++i) {
        alloc_frame(get_page(heap, 1, current_directory), 0, 1);
        env_[i] = (char *)heap;
        memcpy((void *)heap, env[i], strlen(env[i]) * sizeof(char) + 1);
        heap += strlen(env[i]) + 1;
    }
    env_[envc] = 0;

    memcpy(auxv_ptr, auxv, sizeof(Elf32_auxv) * (auxvc));

    current_process->image.heap        = heap; /* heap end */
    current_process->image.heap_actual = heap + (0x1000 - heap % 0x1000);
    current_process->image.user_stack  = USER_STACK_TOP;
    while (current_process->fds->length < 3) {
        process_append_fd((process_t *)current_process, NULL);
    }

    current_process->image.start = entry;

    /* Go go go */
    enter_user_jmp(entry, argc, argv_, USER_STACK_TOP);

    /* We should never reach this code */
    return -1;
}
Пример #7
0
static int sys_open(const char * file, int flags, int mode) {
	PTR_VALIDATE(file);
	debug_print(NOTICE, "open(%s) flags=0x%x; mode=0x%x", file, flags, mode);
	fs_node_t * node = kopen((char *)file, flags);

	int access_bits = 0;

	if (node && (flags & O_CREAT) && (flags & O_EXCL)) {
		close_fs(node);
		return -EEXIST;
	}

	if (!(flags & O_WRONLY) || (flags & O_RDWR)) {
		if (node && !has_permission(node, 04)) {
			debug_print(WARNING, "access denied (read, sys_open, file=%s)", file);
			close_fs(node);
			return -EACCES;
		} else {
			access_bits |= 01;
		}
	}

	if ((flags & O_RDWR) || (flags & O_WRONLY)) {
		if (node && !has_permission(node, 02)) {
			close_fs(node);
			return -EACCES;
		}
		if (node && (node->flags & FS_DIRECTORY)) {
			return -EISDIR;
		}
		if ((flags & O_RDWR) || (flags & O_WRONLY)) {
			/* truncate doesn't grant write permissions */
			access_bits |= 02;
		}
	}

	if (!node && (flags & O_CREAT)) {
		/* TODO check directory permissions */
		debug_print(NOTICE, "- file does not exist and create was requested.");
		/* Um, make one */
		int result = create_file_fs((char *)file, mode);
		if (!result) {
			node = kopen((char *)file, flags);
		} else {
			return result;
		}
	}

	if (node && (flags & O_DIRECTORY)) {
		if (!(node->flags & FS_DIRECTORY)) {
			return -ENOTDIR;
		}
	}

	if (node && (flags & O_TRUNC)) {
		if (!(access_bits & 02)) {
			close_fs(node);
			return -EINVAL;
		}
		truncate_fs(node);
	}

	if (!node) {
		return -ENOENT;
	}
	if (node && (flags & O_CREAT) && (node->flags & FS_DIRECTORY)) {
		close_fs(node);
		return -EISDIR;
	}
	int fd = process_append_fd((process_t *)current_process, node);
	FD_MODE(fd) = access_bits;
	if (flags & O_APPEND) {
		FD_OFFSET(fd) = node->length;
	} else {
		FD_OFFSET(fd) = 0;
	}
	debug_print(INFO, "[open] pid=%d %s -> %d", getpid(), file, fd);
	return fd;
}