1# SPDX-License-Identifier: GPL-2.0-only
2
3# BPF interpreter that, for example, classic socket filters depend on.
4config BPF
5	bool
6
7# Used by archs to tell that they support BPF JIT compiler plus which
8# flavour. Only one of the two can be selected for a specific arch since
9# eBPF JIT supersedes the cBPF JIT.
10
11# Classic BPF JIT (cBPF)
12config HAVE_CBPF_JIT
13	bool
14
15# Extended BPF JIT (eBPF)
16config HAVE_EBPF_JIT
17	bool
18
19# Used by archs to tell that they want the BPF JIT compiler enabled by
20# default for kernels that were compiled with BPF JIT support.
21config ARCH_WANT_DEFAULT_BPF_JIT
22	bool
23
24menu "BPF subsystem"
25
26config BPF_SYSCALL
27	bool "Enable bpf() system call"
28	select BPF
29	select IRQ_WORK
30	select TASKS_TRACE_RCU
31	select BINARY_PRINTF
32	select NET_SOCK_MSG if NET
33	default n
34	help
35	  Enable the bpf() system call that allows to manipulate BPF programs
36	  and maps via file descriptors.
37
38config BPF_JIT
39	bool "Enable BPF Just In Time compiler"
40	depends on BPF
41	depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
42	depends on MODULES
43	help
44	  BPF programs are normally handled by a BPF interpreter. This option
45	  allows the kernel to generate native code when a program is loaded
46	  into the kernel. This will significantly speed-up processing of BPF
47	  programs.
48
49	  Note, an admin should enable this feature changing:
50	  /proc/sys/net/core/bpf_jit_enable
51	  /proc/sys/net/core/bpf_jit_harden   (optional)
52	  /proc/sys/net/core/bpf_jit_kallsyms (optional)
53
54config BPF_JIT_ALWAYS_ON
55	bool "Permanently enable BPF JIT and remove BPF interpreter"
56	depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT
57	help
58	  Enables BPF JIT and removes BPF interpreter to avoid speculative
59	  execution of BPF instructions by the interpreter.
60
61config BPF_JIT_DEFAULT_ON
62	def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
63	depends on HAVE_EBPF_JIT && BPF_JIT
64
65config BPF_UNPRIV_DEFAULT_OFF
66	bool "Disable unprivileged BPF by default"
67	default y
68	depends on BPF_SYSCALL
69	help
70	  Disables unprivileged BPF by default by setting the corresponding
71	  /proc/sys/kernel/unprivileged_bpf_disabled knob to 2. An admin can
72	  still reenable it by setting it to 0 later on, or permanently
73	  disable it by setting it to 1 (from which no other transition to
74	  0 is possible anymore).
75
76	  Unprivileged BPF could be used to exploit certain potential
77	  speculative execution side-channel vulnerabilities on unmitigated
78	  affected hardware.
79
80	  If you are unsure how to answer this question, answer Y.
81
82source "kernel/bpf/preload/Kconfig"
83
84config BPF_LSM
85	bool "Enable BPF LSM Instrumentation"
86	depends on BPF_EVENTS
87	depends on BPF_SYSCALL
88	depends on SECURITY
89	depends on BPF_JIT
90	help
91	  Enables instrumentation of the security hooks with BPF programs for
92	  implementing dynamic MAC and Audit Policies.
93
94	  If you are unsure how to answer this question, answer N.
95
96endmenu # "BPF subsystem"
97