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From: Thomas Gleixner <tglx@linutronix.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	x86@kernel.org, Kees Cook <keescook@chromium.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Lendacky <Thomas.Lendacky@amd.com>,
	Juergen Gross <jgross@suse.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [patch 02/15] x86/cpu: Uninline CR4 accessors
Date: Mon, 20 Apr 2020 19:25:20 +0200	[thread overview]
Message-ID: <87v9luax33.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20200420090102.GB24518@infradead.org>

Christoph Hellwig <hch@infradead.org> writes:
>> --- a/arch/x86/kernel/cpu/common.c
>> +++ b/arch/x86/kernel/cpu/common.c
>> @@ -387,7 +387,30 @@ void native_write_cr4(unsigned long val)
>>  			  bits_missing);
>>  	}
>>  }
>> -EXPORT_SYMBOL(native_write_cr4);
>> +#if IS_MODULE(CONFIG_LKDTM)
>> +EXPORT_SYMBOL_GPL(native_write_cr4);
>> +#endif
>
> While this is better than what we had before we really need to have
> a discussion on lkdtm - it needs a lot of crap that otherwise wouldn't
> be exported, and I'm really worried about people enabling it and thus
> adding exports even if they are conditional.  Can we force the code
> to be built in require a boot option for it to be activated?

I can live with that :)


  parent reply	other threads:[~2020-04-20 17:25 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-19 20:31 [patch 00/15] x86/tlb: Unexport per-CPU tlbstate Thomas Gleixner
2020-04-19 20:31 ` [patch 01/15] x86/tlb: Uninline __get_current_cr3_fast() Thomas Gleixner
2020-04-19 20:31 ` [patch 02/15] x86/cpu: Uninline CR4 accessors Thomas Gleixner
2020-04-20  9:01   ` Christoph Hellwig
2020-04-20  9:34     ` Borislav Petkov
2020-04-20 17:25     ` Thomas Gleixner [this message]
2020-04-19 20:31 ` [patch 03/15] x86/cr4: Sanitize CR4.PCE update Thomas Gleixner
2020-04-19 20:31 ` [patch 04/15] x86/alternatives: Move temporary_mm helpers into C Thomas Gleixner
2020-04-19 20:31 ` [patch 05/15] x86/tlb: Move __flush_tlb() out of line Thomas Gleixner
2020-04-20 13:48   ` Tom Lendacky
2020-04-20 14:03     ` Jürgen Groß
2020-04-20 14:26       ` Tom Lendacky
2020-04-20 14:38         ` Jürgen Groß
2020-04-20 18:30           ` Tom Lendacky
2020-04-19 20:31 ` [patch 06/15] x86/tlb: Move __flush_tlb_global() " Thomas Gleixner
2020-04-19 20:31 ` [patch 07/15] x86/tlb: Move __flush_tlb_one_user() " Thomas Gleixner
2020-04-19 20:31 ` [patch 08/15] x86/tlb: Move __flush_tlb_one_kernel() " Thomas Gleixner
2020-04-19 20:31 ` [patch 09/15] x86/tlb: Move flush_tlb_others() " Thomas Gleixner
2020-04-19 20:31 ` [patch 10/15] x86/tlb: Move paravirt_tlb_remove_table() to the usage site Thomas Gleixner
2020-04-19 20:31 ` [patch 11/15] x86/tlb: Move cr4_set_bits_and_update_boot() " Thomas Gleixner
2020-04-19 20:31 ` [patch 12/15] x86/tlb: Uninline nmi_uaccess_okay() Thomas Gleixner
2020-04-19 20:31 ` [patch 13/15] x86/tlb: Move PCID helpers where they are used Thomas Gleixner
2020-04-19 20:31 ` [patch 14/15] xen/privcmd: Remove unneeded asm/tlb.h include Thomas Gleixner
2020-04-19 20:31 ` [patch 15/15] x86/tlb: Restrict access to tlbstate Thomas Gleixner
2020-04-20  9:20 ` [patch 00/15] x86/tlb: Unexport per-CPU tlbstate Christoph Hellwig
2020-04-20 16:58   ` Alexandre Chartre
2020-04-20 20:08     ` Thomas Gleixner
2020-04-20 17:27   ` Thomas Gleixner
2020-04-21  8:09     ` Sean Christopherson
2020-04-21  9:09       ` Thomas Gleixner
2020-04-22  0:42         ` Sean Christopherson
2020-04-20 10:25 ` Peter Zijlstra
2020-04-20 16:33 ` Alexandre Chartre
2020-04-21 17:10 ` Andy Lutomirski

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