Re: HEADS-UP: ASLR for 64-bit executables enabled by default on main

Hi Daniel


pt., 10 gru 2021 o 10:16 Daniel O'Connor <darius@dons.net.au> napisał(a):
>
>
>
> > On 17 Nov 2021, at 09:00, Marcin Wojtas <mw@semihalf.com> wrote:
> > As of b014e0f15bc7 the ASLR (Address Space Layout
> > Randomization) feature becomes enabled for the all 64-bit
> > binaries by default.
>
> Firstly, thank your for your efforts here, it is appreciated :)
>
> I am finding that the lang/sdcc port is crashing with a seg fault and the core dump is no help to me at all:
> [freebsd14 7:06] /usr/ports/lang/sdcc/work/sdcc-4.0.0/device/lib >sudo gdb ../../bin/sdcc sdcc.core
> GNU gdb (GDB) 11.1 [GDB v11.1 for FreeBSD]
> <snip>
> Reading symbols from ../../bin/sdcc...
> [New LWP 100122]
> Core was generated by `../../bin/sdcc -I../../device/include -I../../device/include/mcs51 -mds390 --nos'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> Invalid permissions for mapped object.
> #0  0x0000000804e3fbc0 in setrlimit () from /lib/libc.so.7
> (gdb) info thread
>   Id   Target Id         Frame
> * 1    LWP 100122        0x0000000804e3fbc0 in setrlimit () from /lib/libc.so.7
> (gdb) bt
> #0  0x0000000804e3fbc0 in setrlimit () from /lib/libc.so.7
> Backtrace stopped: Cannot access memory at address 0x7fffff87fd08
>
> If I disable ASLR (via proccontrol) then it does not crash, but I am not sure how I can debug it further.
>
> I've raised a bug https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260303 if you (or anyone else) has suggestions for what to try.
>

Thanks for filing the ticket. Let's continue the conversation there.

Best regards,
Marcin