Bram Moolenaar <b...@moolenaar.net> wrote:

> James McCoy wrote:
>
>> A few issues were reported on RedHat's bug tracker[0] which have been
>> assigned CVE-2017-11109.  I took an initial look at them and reduced the
>> fuzzer-created scripts so they're clearer (especially for POC2).
>>
>> [0]: https://bugzilla.redhat.com/show_bug.cgi?id=1468492
>>
>> I've also attached a patch that resolves the issue for POC1.  Below are
>> the ASAN tracebacks for each issue, all using 8.0.0702.
>
> I think I fixed POC1, however for POC2 and POC3 I can't really
> see what the problem is.  Perhaps it requires ASAN, valgrind won't be
> sufficient?

I can reproduce the errors with POC2 and POC3 with valgrind
using:

valgrind vim -u NONE -e -s -S POC2 -c ':qa!'
valgrind vim -u NONE -e -s -S POC3 -c ':qa!'

But if you want to use asan,  both gcc and clang have had
asan for quite a while now.  All that is needed to use asan is to
compile and link vim with  -fsanitize=address  and then run vim
normally.  One way is to uncomment out this line in vim/src/Makefile
to compile vim with asan:

#SANITIZER_CFLAGS = -g -O0 -fsanitize=address -fno-omit-frame-pointer

Anyway, asan is not needed in the cases of POC2 or POC3.
Asan was needed for POC1, but this one has been fixed
already.

Regard
Dominique

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