Hi,
I ran a lengthy git bisect yesterday and it's this commit on the stable kernel
git
which causes the issue:
b0cde867b80a5e81fcbc0383e138f5845f2005ee is the first bad commit
commit b0cde867b80a5e81fcbc0383e138f5845f2005ee
Author: Kees Cook <keesc...@chromium.org>
Date: Fri Feb 16 22:25:43 2024 -0800
x86: Increase brk randomness entropy for 64-bit systems
[ Upstream commit 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d ]
In commit c1d171a00294 ("x86: randomize brk"), arch_randomize_brk() was
defined to use a 32MB range (13 bits of entropy), but was never increased
when moving to 64-bit. The default arch_randomize_brk() uses 32MB for
32-bit tasks, and 1GB (18 bits of entropy) for 64-bit tasks.
Update x86_64 to match the entropy used by arm64 and other 64-bit
architectures.
Reported-by: y0un9n...@gmail.com
Signed-off-by: Kees Cook <keesc...@chromium.org>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Acked-by: Jiri Kosina <jkos...@suse.com>
Closes:
https://lore.kernel.org/linux-hardening/CA+2EKTVLvc8hDZc+2Yhwmus=dzoug5e4gv7aycbu0mpjtzz...@mail.gmail.com/
Link:
https://lore.kernel.org/r/20240217062545.1631668-1-keesc...@chromium.org
Signed-off-by: Sasha Levin <sas...@kernel.org>
When I revert it, I can run pbuilder for ARM64 builds all day and it never
crashes.
HTH,
Uli
Mit freundlichen Grüßen / Kind regards
Dipl.-Inform. Ulrich Teichert
Senior Software Developer
kumkeo GmbH
Heidenkampsweg 82a
20097 Hamburg
Germany
T: +49 40 2846761-0
F: +49 40 2846761-99
ulrich.teich...@kumkeo.de
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