x86/cfi,bpf: Fix bpf_struct_ops CFI

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BPF struct_ops uses __arch_prepare_bpf_trampoline() to write
trampolines for indirect function calls. These tramplines much have
matching CFI.

In order to obtain the correct CFI hash for the various methods, add a
matching structure that contains stub functions, the compiler will
generate correct CFI which we can pilfer for the trampolines.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20231215092707.566977112@infradead.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Peter Zijlstra 2023-12-15 10:12:20 +01:00 • committed by Alexei Starovoitov

parent e72d88d18d

commit 2cd3e3772e

7 changed files with 191 additions and 32 deletions

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6

arch/x86/include/asm/cfi.h

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22

arch/x86/kernel/alternative.c

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66

arch/x86/net/bpf_jit_comp.c

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13

include/linux/bpf.h

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16

kernel/bpf/bpf_struct_ops.c

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31

net/bpf/bpf_dummy_struct_ops.c

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69

net/ipv4/bpf_tcp_ca.c

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