RFR: 8240956: SEGV in DwarfParser::process_dwarf after JDK-8234624

[David Holmes]

Hi Yasumasa,

I can't review this as I know nothing about the code, but I'm putting 
the patch through our internal testing.

David

On 14/03/2020 11:35 am, Yasumasa Suenaga wrote:
> Hi all,
> 
> Please review this change:
> 
>    JBS: https://bugs.openjdk.java.net/browse/JDK-8240956
>    webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8240956/webrev.00/
> 
> JDK-8234624 introduced DWARF parser in SA for unwinding native frames in 
> jstack mixed mode.
> However some error has seen intermittently after that.
> 
> I investigated the cause of this, I found two concerns:
> 
>    A: lack of buffer (.eh_frame section data) range check
>    B: Language personality routine and Language Specific Data Area 
> (LSDA) are not considered
> 
> I addd range check for .eh_frame processing, and ignore personality 
> routine and LSDA in this webrev.
> Also I added bailout code if DWARF processing is failed due to these 
> concerns.
> 
> This change has passed all tests on submit repo 
> (mach5-one-ysuenaga-JDK-8240956-20200313-1518-9434671),
> also I tested it on my Fedora 31 box and Oracle Linux 7.7 container.
> 
> 
> Thanks,
> 
> Yasumasa