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envelope-from=jonathan.brielmaier@web.de; helo=mout.web.de X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Brielmaier From: Jonathan Brielmaier via Bug reports for GNU Guix Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: bug-guix-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US X-Migadu-Spam-Score: -7.27 X-Spam-Score: -7.27 X-Migadu-Queue-Id: 3092C1E16C X-Migadu-Scanner: mx12.migadu.com X-TUID: 02CGy50eo01N Hi, I found today an interesting blog post about broken ASLR (Address Space Layout Randomization) on Linux: https://zolutal.github.io/aslrnt/ Curious if this is also a problem on Guix System I did a quick test. ``` $ cat aslr.py from subprocess import check_output result =3D 0x0 for _ in range(0,1000): out =3D check_output("cat /proc/self/maps | grep libc | head -n1", shell=3DTrue).decode() base_address =3D int(out.split('-')[0], 16) result |=3D base_address print('libc: ' + hex(result)) resultld =3D 0x0 for _ in range(0,1000): out =3D check_output("cat /proc/self/maps | grep ld-linux | head -n1", shell=3DTrue).decode() base_address =3D int(out.split('-')[0], 16) resultld |=3D base_address print('ld-linux: ' + hex(resultld)) ``` Running this on x86_64 system of mine results on two systems in: libc: 0x7ffffffa9000 ld-linux: 0x7ffffffff000 On the third system it prints: libc: 0x7ffffffff000 ld-linux: 0x7ffffffff000 For 32bit it looks even worse (not sure if it's correct to test it like this): $ guix shell --system=3Di686-linux coreutils python -- python3 aslr.py libc: 0xf7800000 ld-linux: 0xf7fff000 Not sure what we should do here. There seem to be some a kernel patch for Ubuntu available: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/c= ommit/?h=3Dmaster-next&id=3D760c2b1fa1f5e95be1117bc7b80afb8441d4b002 ~Jonathan