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The verifier provides an architecture-independent implementation of the may_goto instruction, which is currently used on s390x, but it has a downside: there is no way to prevent progs using it from running for a very long time. The solution to this problem is an alternative timed implementation, which requires architecture-specific bits. Its availability is signaled to the verifier by bpf_jit_supports_timed_may_goto() returning true. The verifier then emits a call to arch_bpf_timed_may_goto() using a non-standard calling convention. This function must act as a trampoline for bpf_check_timed_may_goto(). Implement bpf_jit_supports_timed_may_goto(), account for the special calling convention in the BPF_CALL implementation, and implement arch_bpf_timed_may_goto(). Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/r/20250821113339.292434-2-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
7 lines
168 B
Makefile
7 lines
168 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Arch-specific network modules
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#
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obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o bpf_timed_may_goto.o
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obj-$(CONFIG_HAVE_PNETID) += pnet.o
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