Date: Fri, 10 Dec 2021 15:48:51 -0500 From: Mark Johnston <markj@freebsd.org> To: Marcin Wojtas <mw@semihalf.com> Cc: Daniel O'Connor <darius@dons.net.au>, freebsd-current <freebsd-current@freebsd.org>, Fabien Thomas <fabien.thomas@stormshield.eu>, MARECHAL Boris <boris.marechal@stormshield.eu>, Rafal Jaworowski <raj@semihalf.com>, Damien DEVILLE <damien.deville@stormshield.eu> Subject: Re: HEADS-UP: ASLR for 64-bit executables enabled by default on main Message-ID: <YbO9M15V2kUJ7XOl@nuc> In-Reply-To: <CAPv3WKdTZhSB3TEWSigufw7PjNrSkBB83K3u-4RRUrJh6tjhhQ@mail.gmail.com> References: <CAPv3WKc=DUK8ukdqcYNgjxy96CN5kG40-ZO1SxTepUEZDavwpg@mail.gmail.com> <7101CA73-DCAD-4DEF-9861-C62789D22596@dons.net.au> <CAPv3WKdTZhSB3TEWSigufw7PjNrSkBB83K3u-4RRUrJh6tjhhQ@mail.gmail.com>
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On Fri, Dec 10, 2021 at 06:35:47PM +0100, Marcin Wojtas wrote: > 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. I left a comment there. The gist of it is that there are several lingering problems with the stack gap implementation, and I think we should re-disable it on main until there's some consensus on how to proceed.
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