linux-kernel - Re: [PATCH v38 20/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling

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Date:   Fri, 25 Sep 2020 02:11:08 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jethro Beekman <jethro@...tanix.com>,
        akpm@...ux-foundation.org, andriy.shevchenko@...ux.intel.com,
        asapek@...gle.com, cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v38 20/24] x86/traps: Attempt to fixup exceptions in vDSO
 before signaling

On Thu, Sep 24, 2020 at 06:31:28PM +0200, Borislav Petkov wrote:
> 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.

Thanks, fixed.

> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

/Jarkko