Ok thanks!
On 02-May-2017 7:30 pm, "'Alexander Potapenko' via address-sanitizer" <
address-sanitizer@googlegroups.com> wrote:
> It's just that ASan detects errors on a best effort basis, and it's
> harder to detect a buffer overflow past the buffer's redzone.
> On the other hand, such errors are quite rare.
>
> On Tue, May 2, 2017 at 3:34 PM, Aayushi Agrawal <aayushigr...@gmail.com>
> wrote:
> > So is this a kind of issue which is not handled by address sanitizer ?
> >
> > On 02-May-2017 5:45 pm, "'Alexander Potapenko' via address-sanitizer"
> > <address-sanitizer@googlegroups.com> wrote:
> >>
> >> Most certainly the access to global_array[200] ends up touching a
> >> valid location in g[], and the access to g[200] lands somewhere in a
> >> region that has a shadow value of 0.
> >> Unfortunately ASan can only detect a buffer overflow if the memory
> >> access touches unaddressable memory (i.e. that with non-zero shadow).
> >>
> >> On Tue, May 2, 2017 at 2:09 PM, Aayushi Agrawal <aayushigr...@gmail.com
> >
> >> wrote:
> >> > Hello
> >> >
> >> > Here is code snippet -
> >> >
> >> > int global_array[101] = {-1};
> >> > char g[101] = {-2};
> >> >
> >> > int main(int argc, char **argv) {
> >> > global_array[atoi(argv[1])] = 70;
> >> > g[atoi(argv[1])] = 'c';
> >> >
> >> > }
> >> >
> >> > If I compile it with clang , address sanitizer and no other flags used
> >> > then
> >> > for input as "101" it gives ASAN buffer overflow message but input as
> >> > "200"
> >> > does not show any buffer overflow why ?
> >> >
> >> >
> >> > Aayushi
> >> >
> >> > --
> >> > You received this message because you are subscribed to the Google
> >> > Groups
> >> > "address-sanitizer" group.
> >> > To unsubscribe from this group and stop receiving emails from it, send
> >> > an
> >> > email to address-sanitizer+unsubscr...@googlegroups.com.
> >> > For more options, visit https://groups.google.com/d/optout.
> >>
> >>
> >>
> >> --
> >> Alexander Potapenko
> >> Software Engineer
> >>
> >> Google Germany GmbH
> >> Erika-Mann-Straße, 33
> >> 80636 München
> >>
> >> Geschäftsführer: Matthew Scott Sucherman, Paul Terence Manicle
> >> Registergericht und -nummer: Hamburg, HRB 86891
> >> Sitz der Gesellschaft: Hamburg
> >>
> >> --
> >> You received this message because you are subscribed to the Google
> Groups
> >> "address-sanitizer" group.
> >> To unsubscribe from this group and stop receiving emails from it, send
> an
> >> email to address-sanitizer+unsubscr...@googlegroups.com.
> >> For more options, visit https://groups.google.com/d/optout.
> >
> > --
> > You received this message because you are subscribed to the Google Groups
> > "address-sanitizer" group.
> > To unsubscribe from this group and stop receiving emails from it, send an
> > email to address-sanitizer+unsubscr...@googlegroups.com.
> > For more options, visit https://groups.google.com/d/optout.
>
>
>
> --
> Alexander Potapenko
> Software Engineer
>
> Google Germany GmbH
> Erika-Mann-Straße, 33
> 80636 München
>
> Geschäftsführer: Matthew Scott Sucherman, Paul Terence Manicle
> Registergericht und -nummer: Hamburg, HRB 86891
> Sitz der Gesellschaft: Hamburg
>
> --
> You received this message because you are subscribed to the Google Groups
> "address-sanitizer" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to address-sanitizer+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
--
You received this message because you are subscribed to the Google Groups
"address-sanitizer" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to address-sanitizer+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
