linux-kernel - [PATCH v2 0/3] selftests/mm: virtual_address_range: Reduce memory usage and avoid VVAR access

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]

Message-Id: <20250110-virtual_address_range-tests-v2-0-262a2bf3c3d0@linutronix.de>
Date: Fri, 10 Jan 2025 14:05:49 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 Shuah Khan <shuah@...nel.org>, Dev Jain <dev.jain@....com>, 
 Thomas Gleixner <tglx@...utronix.de>, David Hildenbrand <david@...hat.com>
Cc: linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
 kernel test robot <oliver.sang@...el.com>
Subject: [PATCH v2 0/3] selftests/mm: virtual_address_range: Reduce memory
 usage and avoid VVAR access

The selftest started failing since commit e93d2521b27f
("x86/vdso: Split virtual clock pages into dedicated mapping")
was merged. While debugging I stumbled upon some memory usage
optimizations.

With these test now runs on a VM with only 60MiB of memory.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v2:
- Drop /dev/null usage
- Avoid overcommit restrictions by dropping PROT_WRITE
- Avoid high memory usage due to PTEs
- Link to v1: https://lore.kernel.org/r/20250107-virtual_address_range-tests-v1-0-3834a2fb47fe@linutronix.de

---
Thomas Weißschuh (3):
      selftests/mm: virtual_address_range: mmap() without PROT_WRITE
      selftests/mm: virtual_address_range: Unmap chunks after validation
      selftests/mm: virtual_address_range: Avoid reading VVAR mappings

 tools/testing/selftests/mm/config                  |  1 +
 tools/testing/selftests/mm/virtual_address_range.c | 34 +++++++++++++++++++---
 2 files changed, 31 insertions(+), 4 deletions(-)
---
base-commit: 32af4d2269d20fe2f8d32aaa456cad8e40abd365
change-id: 20250107-virtual_address_range-tests-95843766fa97

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>