linux-kernel - problems with memory allocation and the alignment check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 22 Feb 2021 10:08:50 +0100
From:   "Michael J. Baars" <mjbaars1977.gcc@...erfiber.eu>
To:     gcc@....gnu.org, linux-kernel@...r.kernel.org
Subject: problems with memory allocation and the alignment check

Hi,

I just wrote this little program to demonstrate a possible flaw in both malloc and calloc.

If I allocate a the simplest memory region from main(), one out of three optimization flags fail.
If I allocate the same region from a function, three out of three optimization flags fail.

Does someone know if this really is a flaw, and if so, is it a gcc or a kernel flaw?

Regards,
Mischa.

View attachment "main.c" of type "text/x-csrc" (862 bytes)

View attachment "makefile" of type "text/x-makefile" (102 bytes)