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

[Daniel O'Connor via freebsd-current]

> On 17 Nov 2021, at 09:00, Marcin Wojtas <m...@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.

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum