linux-kernel - [PATCH 0/8] __vmalloc() and no-block support

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: <20250807075810.358714-1-urezki@gmail.com>
Date: Thu,  7 Aug 2025 09:58:02 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: Vlastimil Babka <vbabka@...e.cz>,
	Michal Hocko <mhocko@...nel.org>,
	Baoquan He <bhe@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Uladzislau Rezki <urezki@...il.com>
Subject: [PATCH 0/8] __vmalloc() and no-block support

Hello.

This is a second series of making __vmalloc() to support GFP_ATOMIC and
GFP_NOWAIT flags. It tends to improve the non-blocking behaviour.

The first one can be found here:

https://lore.kernel.org/all/20250704152537.55724-1-urezki@gmail.com/

that was an RFC. Using this series for testing i have not found more
places which can trigger: scheduling during atomic. Though there is
one which requires attention. I will explain in [1].

Please note, non-blocking gets improved in the __vmalloc() call only,
i.e. vmalloc_huge() still contains in its paths many cond_resched()
points and can not be used as non-blocking as of now.

[1] The vmap_pages_range_noflush() contains the kmsan_vmap_pages_range_noflush()
external implementation for KCSAN specifically which is hard coded to GFP_KERNEL.
The kernel should be built with CONFIG_KCSAN option. To me it looks like not
straight forward to run such kernel on my box, therefore i need more time to
investigate what is wrong with CONFIG_KCSAN and my env.

Uladzislau Rezki (Sony) (8):
  lib/test_vmalloc: add no_block_alloc_test case
  lib/test_vmalloc: Remove xfail condition check
  mm/vmalloc: Support non-blocking GFP flags in alloc_vmap_area()
  mm/vmalloc: Remove cond_resched() in vm_area_alloc_pages()
  mm/kasan, mm/vmalloc: Respect GFP flags in kasan_populate_vmalloc()
  mm/vmalloc: Defer freeing partly initialized vm_struct
  mm/vmalloc: Support non-blocking GFP flags in __vmalloc_area_node()
  mm: Drop __GFP_DIRECT_RECLAIM flag if PF_MEMALLOC is set

 include/linux/kasan.h    |  6 ++--
 include/linux/sched/mm.h |  7 +++-
 include/linux/vmalloc.h  |  6 +++-
 lib/test_vmalloc.c       | 28 ++++++++++++++-
 mm/kasan/shadow.c        | 22 ++++++++----
 mm/vmalloc.c             | 77 ++++++++++++++++++++++++++++++++--------
 6 files changed, 119 insertions(+), 27 deletions(-)

-- 
2.39.5