Kconfig (3088B)
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"