From: Peter Zijlstra <peterz@infradead.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
alyssa.milburn@intel.com, scott.d.constable@intel.com,
joao@overdrivepizza.com, andrew.cooper3@citrix.com,
jpoimboe@kernel.org, alexei.starovoitov@gmail.com,
ebiggers@kernel.org, samitolvanen@google.com, kees@kernel.org
Subject: Re: [PATCH 1/8] x86,kcfi: Fix EXPORT_SYMBOL vs kCFI
Date: Tue, 5 Nov 2024 15:27:20 +0100 [thread overview]
Message-ID: <20241105142720.GG10375@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <Zyoood0ooSbpultV@infradead.org>
On Tue, Nov 05, 2024 at 06:16:01AM -0800, Christoph Hellwig wrote:
> On Tue, Nov 05, 2024 at 12:39:02PM +0100, Peter Zijlstra wrote:
> > The expectation is that all EXPORT'ed symbols are free to have their
> > address taken and called indirectly.
>
> I don't think that is the case at all. The is a relatively small number
> of exported symbols that are called indirectly. I'd much rather mark
> those explicitly.
I'm not claiming they have their address taken -- just saying that
traditionally this has always been a valid thing to do.
Anyway, I raised this point last time, and I think back then the
consensus was to explicitly mark those you should not be able to call.
But irrespective of all that, this just makes sure all the .S functions
are on equal footing with the C functions as generated by the compiler.
Once that's done, we can look at adding to the EXPORT family.
next prev parent reply other threads:[~2024-11-05 14:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-05 11:39 [PATCH 0/8] x86: kCFI and IBT cleanups Peter Zijlstra
2024-11-05 11:39 ` [PATCH 1/8] x86,kcfi: Fix EXPORT_SYMBOL vs kCFI Peter Zijlstra
2024-11-05 14:16 ` Christoph Hellwig
2024-11-05 14:27 ` Peter Zijlstra [this message]
2024-11-05 14:32 ` Christoph Hellwig
2024-11-05 14:58 ` Peter Zijlstra
2024-11-05 15:41 ` Christoph Hellwig
2024-11-05 15:47 ` Peter Zijlstra
2024-11-05 16:11 ` Peter Zijlstra
2024-11-09 9:14 ` David Laight
2024-11-05 11:39 ` [PATCH 2/8] x86/cfi: Clean up linkage Peter Zijlstra
2024-11-05 11:39 ` [PATCH 3/8] x86/boot: Mark start_secondary() with __noendbr Peter Zijlstra
2024-11-05 11:39 ` [PATCH 4/8] x86/alternative: Simplify callthunk patching Peter Zijlstra
2024-11-05 11:39 ` [PATCH 5/8] x86/traps: Cleanup and robustify decode_bug() Peter Zijlstra
2024-11-05 15:19 ` Andrew Cooper
2024-11-05 11:39 ` [PATCH 6/8] x86/ibt: Clean up is_endbr() Peter Zijlstra
2024-11-05 11:39 ` [PATCH 7/8] x86/ibt: Clean up poison_endbr() Peter Zijlstra
2024-11-05 11:39 ` [PATCH 8/8] x86/early_printk: Harden early_serial Peter Zijlstra
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