linux-kernel - Re: powerpc/perf: Dereference bhrb entries safely

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Date:   Fri, 22 Dec 2017 15:43:22 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     maddy@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        kamalesh@...ux.vnet.ibm.com, paulus@...ba.org, kan.liang@...el.com,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        tglx@...utronix.de, linuxppc-dev@...ts.ozlabs.org,
        naveen.n.rao@...ux.vnet.ibm.com
Subject: Re: powerpc/perf: Dereference bhrb entries safely

On Tue, 2017-12-12 at 12:29:15 UTC, Ravi Bangoria wrote:
> It may very well happen that branch instructions recorded by
> bhrb entries already get unmapped before they get processed by
> the kernel. Hence, trying to dereference such memory location
> will endup in a crash. Ex,
> 
>     Unable to handle kernel paging request for data at address 0xc008000019c41764
>     Faulting instruction address: 0xc000000000084a14
>     NIP [c000000000084a14] branch_target+0x4/0x70
>     LR [c0000000000eb828] record_and_restart+0x568/0x5c0
>     Call Trace:
>     [c0000000000eb3b4] record_and_restart+0xf4/0x5c0 (unreliable)
>     [c0000000000ec378] perf_event_interrupt+0x298/0x460
>     [c000000000027964] performance_monitor_exception+0x54/0x70
>     [c000000000009ba4] performance_monitor_common+0x114/0x120
> 
> Fix this by deferefencing them safely.
> 
> Suggested-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> Reviewed-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/f41d84dddc66b164ac16acf3f584c2

cheers