linux-kernel - Re: [PATCH 2/2] x86/cfi,bpf: Fix BPF JIT call

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Date:   Wed, 22 Nov 2023 13:54:13 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, davem@...emloft.net, dsahern@...nel.org,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yonghong.song@...ux.dev,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, Arnd Bergmann <arnd@...db.de>,
        samitolvanen@...gle.com, keescook@...omium.org, nathan@...nel.org,
        ndesaulniers@...gle.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-arch@...r.kernel.org,
        llvm@...ts.linux.dev, jpoimboe@...nel.org, joao@...rdrivepizza.com,
        mark.rutland@....com
Subject: Re: [PATCH 2/2] x86/cfi,bpf: Fix BPF JIT call

On Wed, Nov 22, 2023 at 01:41:34PM +0100, Peter Zijlstra wrote:
> +#ifdef CONFIG_FINEIBT
> +	/*
> +	 * When FineIBT, code in the __cfi_foo() symbols can get executed
> +	 * and hence unwinder needs help.
> +	 */
> +	if (cfi_mode != CFI_FINEIBT)
> +		return;
> +
> +	snprintf(fp->aux->ksym_prefix.name, KSYM_NAME_LEN,
> +		 "__cfi_%s", fp->aux->ksym.name);
> +
> +	prog->aux->ksym_prefix.start = (unsigned long) prog->bpf_func - 16;
> +	prog->aux->ksym_prefix.end   = (unsigned long) prog->bpf_func;
> +
> +	bpf_ksym_add(&fp->aux->ksym_prefix);
> +#endif
>  }

s/prog/fp/ makes compiler happier