Merge branch 'bpf: Add detection of kfuncs.'

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Alexei Starovoitov says:

====================

From: Alexei Starovoitov <ast@kernel.org>

Allow BPF programs detect at load time whether particular kfunc exists.

Patch 1: Allow ld_imm64 to point to kfunc in the kernel.
Patch 2: Fix relocation of kfunc in ld_imm64 insn when kfunc is in kernel module.
Patch 3: Introduce bpf_ksym_exists() macro.
Patch 4: selftest.

NOTE: detection of kfuncs from light skeleton is not supported yet.
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Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

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Andrii Nakryiko 2023-03-17 15:44:27 -07:00

parent 0f10f647f4 95fdf6e313

commit 6cae5a7106

4 changed files with 41 additions and 7 deletions

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17

kernel/bpf/verifier.c

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5

tools/lib/bpf/bpf_helpers.h

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6

tools/lib/bpf/libbpf.c

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20

tools/testing/selftests/bpf/progs/task_kfunc_success.c

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