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bpf: allow bpf_fastcall for bpf_cast_to_kern_ctx and bpf_rdonly_cast

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do_misc_fixups() relaces bpf_cast_to_kern_ctx() and bpf_rdonly_cast()
by a single instruction "r0 = r1". This follows bpf_fastcall contract.
This commit allows bpf_fastcall pattern rewrite for these two
functions in order to use them in bpf_fastcall selftests.

Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20240822084112.3257995-5-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2024-08-22 01:41:10 -07:00 committed by Alexei Starovoitov
parent b2ee6d27e9
commit 4060909324
1 changed files with 3 additions and 0 deletions
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3
kernel/bpf/verifier.c
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@ -16170,6 +16170,9 @@ static u32 kfunc_fastcall_clobber_mask(struct bpf_kfunc_call_arg_meta *meta)
/* Same as verifier_inlines_helper_call() but for kfuncs, see comment above */
static bool is_fastcall_kfunc_call(struct bpf_kfunc_call_arg_meta *meta)
{
if (meta->btf == btf_vmlinux)
return meta->func_id == special_kfunc_list[KF_bpf_cast_to_kern_ctx] ||
meta->func_id == special_kfunc_list[KF_bpf_rdonly_cast];
return false;
}