From: Peter Zijlstra <peterz@infradead.org>
To: Petr Pavlu <petr.pavlu@suse.com>
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, hpa@zytor.com, mhiramat@kernel.org,
samitolvanen@google.com, x86@kernel.org,
linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] x86/retpoline,kprobes: Avoid treating rethunk as an indirect jump
Date: Wed, 5 Jul 2023 11:02:44 +0200 [thread overview]
Message-ID: <20230705090244.GH462772@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20230705081547.25130-3-petr.pavlu@suse.com>
On Wed, Jul 05, 2023 at 10:15:47AM +0200, Petr Pavlu wrote:
> ---
> arch/x86/kernel/vmlinux.lds.S | 2 --
> arch/x86/lib/retpoline.S | 4 ++++
> 2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index a4cd04c458df..dd5b0a68cf84 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -133,9 +133,7 @@ SECTIONS
> KPROBES_TEXT
> SOFTIRQENTRY_TEXT
> #ifdef CONFIG_RETPOLINE
> - __indirect_thunk_start = .;
> *(.text..__x86.*)
> - __indirect_thunk_end = .;
> #endif
Arguably you could do:
__indirect_thunk_start = .;
*(.text..__x86.indirect_thunk)
__indirect_thunk_end = .;
*(.text..__x86.return_think)
Or somesuch, seems simpler to me.
next prev parent reply other threads:[~2023-07-05 9:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-05 8:15 [PATCH 0/2] x86/retpoline,kprobes: Fix the [__indirect_thunk_start, ..end] range Petr Pavlu
2023-07-05 8:15 ` [PATCH 1/2] x86/retpoline,kprobes: Fix position of thunk sections with CONFIG_LTO_CLANG Petr Pavlu
2023-07-05 8:52 ` Peter Zijlstra
2023-07-05 8:15 ` [PATCH 2/2] x86/retpoline,kprobes: Avoid treating rethunk as an indirect jump Petr Pavlu
2023-07-05 8:58 ` Peter Zijlstra
2023-07-05 14:20 ` Masami Hiramatsu
2023-07-05 14:50 ` Peter Zijlstra
2023-07-06 0:47 ` Masami Hiramatsu
2023-07-06 7:17 ` Peter Zijlstra
2023-07-06 9:00 ` Masami Hiramatsu
2023-07-06 11:34 ` Peter Zijlstra
2023-07-07 14:39 ` Masami Hiramatsu
2023-07-08 14:18 ` Petr Pavlu
2023-07-09 15:25 ` Masami Hiramatsu
2023-07-05 9:02 ` Peter Zijlstra [this message]
2023-07-05 14:40 ` Masami Hiramatsu
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