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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_RCU if PREEMPTION
31 select TASKS_TRACE_RCU
32 select BINARY_PRINTF
33 select NET_SOCK_MSG if NET
34 select NET_XGRESS if NET
35 select PAGE_POOL if NET
36 default n
37 help
38 Enable the bpf() system call that allows to manipulate BPF programs
39 and maps via file descriptors.
40
41config BPF_JIT
42 bool "Enable BPF Just In Time compiler"
43 depends on BPF
44 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
45 depends on MODULES
46 help
47 BPF programs are normally handled by a BPF interpreter. This option
48 allows the kernel to generate native code when a program is loaded
49 into the kernel. This will significantly speed-up processing of BPF
50 programs.
51
52 Note, an admin should enable this feature changing:
53 /proc/sys/net/core/bpf_jit_enable
54 /proc/sys/net/core/bpf_jit_harden (optional)
55 /proc/sys/net/core/bpf_jit_kallsyms (optional)
56
57config BPF_JIT_ALWAYS_ON
58 bool "Permanently enable BPF JIT and remove BPF interpreter"
59 depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT
60 help
61 Enables BPF JIT and removes BPF interpreter to avoid speculative
62 execution of BPF instructions by the interpreter.
63
64 When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/bpf_jit_enable
65 is permanently set to 1 and setting any other value than that will
66 return failure.
67
68config BPF_JIT_DEFAULT_ON
69 def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
70 depends on HAVE_EBPF_JIT && BPF_JIT
71
72config BPF_UNPRIV_DEFAULT_OFF
73 bool "Disable unprivileged BPF by default"
74 default y
75 depends on BPF_SYSCALL
76 help
77 Disables unprivileged BPF by default by setting the corresponding
78 /proc/sys/kernel/unprivileged_bpf_disabled knob to 2. An admin can
79 still reenable it by setting it to 0 later on, or permanently
80 disable it by setting it to 1 (from which no other transition to
81 0 is possible anymore).
82
83 Unprivileged BPF could be used to exploit certain potential
84 speculative execution side-channel vulnerabilities on unmitigated
85 affected hardware.
86
87 If you are unsure how to answer this question, answer Y.
88
89source "kernel/bpf/preload/Kconfig"
90
91config BPF_LSM
92 bool "Enable BPF LSM Instrumentation"
93 depends on BPF_EVENTS
94 depends on BPF_SYSCALL
95 depends on SECURITY
96 depends on BPF_JIT
97 help
98 Enables instrumentation of the security hooks with BPF programs for
99 implementing dynamic MAC and Audit Policies.
100
101 If you are unsure how to answer this question, answer N.
102
103endmenu # "BPF subsystem"
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_RCU if PREEMPTION
31 select TASKS_TRACE_RCU
32 select BINARY_PRINTF
33 select NET_SOCK_MSG if NET
34 select PAGE_POOL if NET
35 default n
36 help
37 Enable the bpf() system call that allows to manipulate BPF programs
38 and maps via file descriptors.
39
40config BPF_JIT
41 bool "Enable BPF Just In Time compiler"
42 depends on BPF
43 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
44 depends on MODULES
45 help
46 BPF programs are normally handled by a BPF interpreter. This option
47 allows the kernel to generate native code when a program is loaded
48 into the kernel. This will significantly speed-up processing of BPF
49 programs.
50
51 Note, an admin should enable this feature changing:
52 /proc/sys/net/core/bpf_jit_enable
53 /proc/sys/net/core/bpf_jit_harden (optional)
54 /proc/sys/net/core/bpf_jit_kallsyms (optional)
55
56config BPF_JIT_ALWAYS_ON
57 bool "Permanently enable BPF JIT and remove BPF interpreter"
58 depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT
59 help
60 Enables BPF JIT and removes BPF interpreter to avoid speculative
61 execution of BPF instructions by the interpreter.
62
63 When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/bpf_jit_enable
64 is permanently set to 1 and setting any other value than that will
65 return failure.
66
67config BPF_JIT_DEFAULT_ON
68 def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
69 depends on HAVE_EBPF_JIT && BPF_JIT
70
71config BPF_UNPRIV_DEFAULT_OFF
72 bool "Disable unprivileged BPF by default"
73 default y
74 depends on BPF_SYSCALL
75 help
76 Disables unprivileged BPF by default by setting the corresponding
77 /proc/sys/kernel/unprivileged_bpf_disabled knob to 2. An admin can
78 still reenable it by setting it to 0 later on, or permanently
79 disable it by setting it to 1 (from which no other transition to
80 0 is possible anymore).
81
82 Unprivileged BPF could be used to exploit certain potential
83 speculative execution side-channel vulnerabilities on unmitigated
84 affected hardware.
85
86 If you are unsure how to answer this question, answer Y.
87
88source "kernel/bpf/preload/Kconfig"
89
90config BPF_LSM
91 bool "Enable BPF LSM Instrumentation"
92 depends on BPF_EVENTS
93 depends on BPF_SYSCALL
94 depends on SECURITY
95 depends on BPF_JIT
96 help
97 Enables instrumentation of the security hooks with BPF programs for
98 implementing dynamic MAC and Audit Policies.
99
100 If you are unsure how to answer this question, answer N.
101
102endmenu # "BPF subsystem"