bpf: Move insn_buf[16] to bpf_verifier_env

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This patch moves the 'struct bpf_insn insn_buf[16]' stack usage
to the bpf_verifier_env. A '#define INSN_BUF_SIZE 16' is also added
to replace the ARRAY_SIZE(insn_buf) usages.

Both convert_ctx_accesses() and do_misc_fixup() are changed
to use the env->insn_buf.

It is a refactoring work for adding the epilogue_buf[16] in a later patch.

With this patch, the stack size usage decreased.

Before:
./kernel/bpf/verifier.c:22133:5: warning: stack frame size (2584)

After:
./kernel/bpf/verifier.c:22184:5: warning: stack frame size (2264)

Reviewed-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240829210833.388152-2-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Martin KaFai Lau 2024-08-29 14:08:23 -07:00 • committed by Alexei Starovoitov

parent c6d9dafb59

commit 6f606ffd6d

2 changed files with 11 additions and 7 deletions

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3

include/linux/bpf_verifier.h

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15

kernel/bpf/verifier.c

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