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Date:   Thu, 24 Sep 2020 18:31:28 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc:     x86@kernel.org, linux-sgx@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Jethro Beekman <jethro@fortanix.com>,
        akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com,
        asapek@google.com, cedric.xing@intel.com, chenalexchen@google.com,
        conradparker@google.com, cyhanish@google.com,
        dave.hansen@intel.com, haitao.huang@intel.com,
        josh@joshtriplett.org, kai.huang@intel.com, kai.svahn@intel.com,
        kmoy@google.com, ludloff@google.com, luto@kernel.org,
        nhorman@redhat.com, npmccallum@redhat.com, puiterwijk@redhat.com,
        rientjes@google.com, tglx@linutronix.de, yaozhangx@google.com
Subject: Re: [PATCH v38 20/24] x86/traps: Attempt to fixup exceptions in vDSO
 before signaling
Message-ID: <20200924163128.GM5030@zn.tnic>
References: <20200915112842.897265-1-jarkko.sakkinen@linux.intel.com>
 <20200915112842.897265-21-jarkko.sakkinen@linux.intel.com>
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In-Reply-To: <20200915112842.897265-21-jarkko.sakkinen@linux.intel.com>
Precedence: bulk

On Tue, Sep 15, 2020 at 02:28:38PM +0300, Jarkko Sakkinen wrote:
> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index 9e5ec861aba0..ebe290a68c36 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -30,6 +30,7 @@
>  #include <asm/cpu_entry_area.h>		/* exception stack		*/
>  #include <asm/pgtable_areas.h>		/* VMALLOC_START, ...		*/
>  #include <asm/kvm_para.h>		/* kvm_handle_async_pf		*/
> +#include <asm/vdso.h>			/* fixup_vdso_exception()	*/
>  
>  #define CREATE_TRACE_POINTS
>  #include <asm/trace/exceptions.h>
> @@ -775,6 +776,10 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
>  
>  		sanitize_error_code(address, &error_code);
>  
> +		if (fixup_vdso_exception(regs, X86_TRAP_PF, error_code,
> +		    address))

No need to break that line.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette