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Merge tag 'landlock_v34' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

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Pull Landlock LSM from James Morris:
 "Add Landlock, a new LSM from Mickaël Salaün.

  Briefly, Landlock provides for unprivileged application sandboxing.

  From Mickaël's cover letter:
    "The goal of Landlock is to enable to restrict ambient rights (e.g.
     global filesystem access) for a set of processes. Because Landlock
     is a stackable LSM [1], it makes possible to create safe security
     sandboxes as new security layers in addition to the existing
     system-wide access-controls. This kind of sandbox is expected to
     help mitigate the security impact of bugs or unexpected/malicious
     behaviors in user-space applications. Landlock empowers any
     process, including unprivileged ones, to securely restrict
     themselves.

     Landlock is inspired by seccomp-bpf but instead of filtering
     syscalls and their raw arguments, a Landlock rule can restrict the
     use of kernel objects like file hierarchies, according to the
     kernel semantic. Landlock also takes inspiration from other OS
     sandbox mechanisms: XNU Sandbox, FreeBSD Capsicum or OpenBSD
     Pledge/Unveil.

     In this current form, Landlock misses some access-control features.
     This enables to minimize this patch series and ease review. This
     series still addresses multiple use cases, especially with the
     combined use of seccomp-bpf: applications with built-in sandboxing,
     init systems, security sandbox tools and security-oriented APIs [2]"

  The cover letter and v34 posting is here:

      https://lore.kernel.org/linux-security-module/20210422154123.13086-1-mic@digikod.net/

  See also:

      https://landlock.io/

  This code has had extensive design discussion and review over several
  years"

Link: https://lore.kernel.org/lkml/50db058a-7dde-441b-a7f9-f6837fe8b69f@schaufler-ca.com/ [1]
Link: https://lore.kernel.org/lkml/f646e1c7-33cf-333f-070c-0a40ad0468cd@digikod.net/ [2]

* tag 'landlock_v34' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  landlock: Enable user space to infer supported features
  landlock: Add user and kernel documentation
  samples/landlock: Add a sandbox manager example
  selftests/landlock: Add user space tests
  landlock: Add syscall implementations
  arch: Wire up Landlock syscalls
  fs,security: Add sb_delete hook
  landlock: Support filesystem access-control
  LSM: Infrastructure management of the superblock
  landlock: Add ptrace restrictions
  landlock: Set up the security framework and manage credentials
  landlock: Add ruleset and domain management
  landlock: Add object management
This commit is contained in:
Linus Torvalds
2021-05-01 18:50:44 -07:00
parent e6f0bf09f0 3532b0b435
commit 17ae69aba8
72 changed files with 6987 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/uapi/asm-generic/unistd.h
View File

@@ -866,8 +866,15 @@ __SYSCALL(__NR_mount_setattr, sys_mount_setattr)
#define __NR_quotactl_path 443
__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
#define __NR_landlock_create_ruleset 444
__SYSCALL(__NR_landlock_create_ruleset, sys_landlock_create_ruleset)
#define __NR_landlock_add_rule 445
__SYSCALL(__NR_landlock_add_rule, sys_landlock_add_rule)
#define __NR_landlock_restrict_self 446
__SYSCALL(__NR_landlock_restrict_self, sys_landlock_restrict_self)
#undef __NR_syscalls
#define __NR_syscalls 444
#define __NR_syscalls 447
/*
* 32 bit systems traditionally used different

137
include/uapi/linux/landlock.h Normal file
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@@ -0,0 +1,137 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Landlock - User space API
*
* Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
* Copyright © 2018-2020 ANSSI
*/
#ifndef _UAPI_LINUX_LANDLOCK_H
#define _UAPI_LINUX_LANDLOCK_H
#include <linux/types.h>
/**
* struct landlock_ruleset_attr - Ruleset definition
*
* Argument of sys_landlock_create_ruleset(). This structure can grow in
* future versions.
*/
struct landlock_ruleset_attr {
/**
* @handled_access_fs: Bitmask of actions (cf. `Filesystem flags`_)
* that is handled by this ruleset and should then be forbidden if no
* rule explicitly allow them. This is needed for backward
* compatibility reasons.
*/
__u64 handled_access_fs;
};
/*
* sys_landlock_create_ruleset() flags:
*
* - %LANDLOCK_CREATE_RULESET_VERSION: Get the highest supported Landlock ABI
* version.
*/
#define LANDLOCK_CREATE_RULESET_VERSION (1U << 0)
/**
* enum landlock_rule_type - Landlock rule type
*
* Argument of sys_landlock_add_rule().
*/
enum landlock_rule_type {
/**
* @LANDLOCK_RULE_PATH_BENEATH: Type of a &struct
* landlock_path_beneath_attr .
*/
LANDLOCK_RULE_PATH_BENEATH = 1,
};
/**
* struct landlock_path_beneath_attr - Path hierarchy definition
*
* Argument of sys_landlock_add_rule().
*/
struct landlock_path_beneath_attr {
/**
* @allowed_access: Bitmask of allowed actions for this file hierarchy
* (cf. `Filesystem flags`_).
*/
__u64 allowed_access;
/**
* @parent_fd: File descriptor, open with ``O_PATH``, which identifies
* the parent directory of a file hierarchy, or just a file.
*/
__s32 parent_fd;
/*
* This struct is packed to avoid trailing reserved members.
* Cf. security/landlock/syscalls.c:build_check_abi()
*/
} __attribute__((packed));
/**
* DOC: fs_access
*
* A set of actions on kernel objects may be defined by an attribute (e.g.
* &struct landlock_path_beneath_attr) including a bitmask of access.
*
* Filesystem flags
* ~~~~~~~~~~~~~~~~
*
* These flags enable to restrict a sandboxed process to a set of actions on
* files and directories. Files or directories opened before the sandboxing
* are not subject to these restrictions.
*
* A file can only receive these access rights:
*
* - %LANDLOCK_ACCESS_FS_EXECUTE: Execute a file.
* - %LANDLOCK_ACCESS_FS_WRITE_FILE: Open a file with write access.
* - %LANDLOCK_ACCESS_FS_READ_FILE: Open a file with read access.
*
* A directory can receive access rights related to files or directories. The
* following access right is applied to the directory itself, and the
* directories beneath it:
*
* - %LANDLOCK_ACCESS_FS_READ_DIR: Open a directory or list its content.
*
* However, the following access rights only apply to the content of a
* directory, not the directory itself:
*
* - %LANDLOCK_ACCESS_FS_REMOVE_DIR: Remove an empty directory or rename one.
* - %LANDLOCK_ACCESS_FS_REMOVE_FILE: Unlink (or rename) a file.
* - %LANDLOCK_ACCESS_FS_MAKE_CHAR: Create (or rename or link) a character
* device.
* - %LANDLOCK_ACCESS_FS_MAKE_DIR: Create (or rename) a directory.
* - %LANDLOCK_ACCESS_FS_MAKE_REG: Create (or rename or link) a regular file.
* - %LANDLOCK_ACCESS_FS_MAKE_SOCK: Create (or rename or link) a UNIX domain
* socket.
* - %LANDLOCK_ACCESS_FS_MAKE_FIFO: Create (or rename or link) a named pipe.
* - %LANDLOCK_ACCESS_FS_MAKE_BLOCK: Create (or rename or link) a block device.
* - %LANDLOCK_ACCESS_FS_MAKE_SYM: Create (or rename or link) a symbolic link.
*
* .. warning::
*
* It is currently not possible to restrict some file-related actions
* accessible through these syscall families: :manpage:`chdir(2)`,
* :manpage:`truncate(2)`, :manpage:`stat(2)`, :manpage:`flock(2)`,
* :manpage:`chmod(2)`, :manpage:`chown(2)`, :manpage:`setxattr(2)`,
* :manpage:`utime(2)`, :manpage:`ioctl(2)`, :manpage:`fcntl(2)`,
* :manpage:`access(2)`.
* Future Landlock evolutions will enable to restrict them.
*/
#define LANDLOCK_ACCESS_FS_EXECUTE (1ULL << 0)
#define LANDLOCK_ACCESS_FS_WRITE_FILE (1ULL << 1)
#define LANDLOCK_ACCESS_FS_READ_FILE (1ULL << 2)
#define LANDLOCK_ACCESS_FS_READ_DIR (1ULL << 3)
#define LANDLOCK_ACCESS_FS_REMOVE_DIR (1ULL << 4)
#define LANDLOCK_ACCESS_FS_REMOVE_FILE (1ULL << 5)
#define LANDLOCK_ACCESS_FS_MAKE_CHAR (1ULL << 6)
#define LANDLOCK_ACCESS_FS_MAKE_DIR (1ULL << 7)
#define LANDLOCK_ACCESS_FS_MAKE_REG (1ULL << 8)
#define LANDLOCK_ACCESS_FS_MAKE_SOCK (1ULL << 9)
#define LANDLOCK_ACCESS_FS_MAKE_FIFO (1ULL << 10)
#define LANDLOCK_ACCESS_FS_MAKE_BLOCK (1ULL << 11)
#define LANDLOCK_ACCESS_FS_MAKE_SYM (1ULL << 12)
#endif /* _UAPI_LINUX_LANDLOCK_H */