From: sashiko-bot@kernel.org
To: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Cc: linux-trace-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-perf-users@vger.kernel.org,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
linux-rdma@vger.kernel.org,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
dri-devel@lists.freedesktop.org, "Marc Zyngier" <maz@kernel.org>,
bpf@vger.kernel.org, selinux@vger.kernel.org,
"Heiko Carstens" <hca@linux.ibm.com>,
kvmarm@lists.linux.dev, "Oliver Upton" <oupton@kernel.org>,
"Vasily Gorbik" <gor@linux.ibm.com>,
linux-s390@vger.kernel.org
Subject: Re: [PATCH v2 30/40] mm/madvise: update is_valid_guard_vma() to use vma_can_merge()
Date: Mon, 14 Sep 2026 22:14:49 +0000 [thread overview]
Message-ID: <20260914221450.4A33D1F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20260914-b4-mmap-prepare-vma-flag-sanify-v2-30-7d9781ed5361@kernel.org>
> We currently disallow the installation of lightweight guard regions in VMAs
> whose flags intersect VMA_SPECIAL_FLAGS or VMA_HUGETLB_BIT, or
> VMA_LOCKED_BIT unless allow_locked is set.
>
> hugetlb VMAs set VMA_DONTEXPAND_BIT so this was already redundant,
> VMA_SPECIAL_FLAGS already sufficed.
>
> However, now that VMA_IO_BIT is only set if VMA_PFNMAP or VMA_MIXEDMAP_BIT
> is set, this check collapses to being the equivalent of
> !vma_can_merge().
>
> Update is_valid_guard_vma() to reflect this.
>
> No functional change intended.
>
> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260914-b4-mmap-prepare-vma-flag-sanify-v2-0-7d9781ed5361@kernel.org?part=30
next prev parent reply other threads:[~2026-09-14 22:14 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-14 14:57 [PATCH v2 00/40] mm: make VMA flag semantics explicit, eliminate VM_SPECIAL Lorenzo Stoakes (ARM)
2026-09-14 14:57 ` [PATCH v2 01/40] mm/vma: fix mmap_prepare file handling, remove file_doesnt_need_get Lorenzo Stoakes (ARM)
2026-09-14 15:40 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 02/40] mm/vma: predicate setting mmap_prepare VMA fields on new vma alloc Lorenzo Stoakes (ARM)
2026-09-14 15:55 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 03/40] mm/vma: introduce and use vma_[flags_]can_merge() Lorenzo Stoakes (ARM)
2026-09-14 15:59 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 04/40] mm: consistently validate VMA state after mmap[_prepare] hooks Lorenzo Stoakes (ARM)
2026-09-14 16:18 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 05/40] mm/vma: ensure mmap_prepare doesn't set actions on a mergeable vma Lorenzo Stoakes (ARM)
2026-09-14 16:45 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 06/40] mm: make map_kernel_pages_[prepare,complete] internal and unexported Lorenzo Stoakes (ARM)
2026-09-14 16:47 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 07/40] mm/vma: tidy up map kernel pages enum values Lorenzo Stoakes (ARM)
2026-09-14 16:50 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 08/40] mm: add mmap action for discontiguous kernel page mapping Lorenzo Stoakes (ARM)
2026-09-14 17:03 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 09/40] docs: filesystems: update mmap_prepare docs for discontig kernel pgs Lorenzo Stoakes (ARM)
2026-09-14 17:07 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 10/40] drivers/usb/mon: update to use mmap_prepare + map kernel pages Lorenzo Stoakes (ARM)
2026-09-14 17:18 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 11/40] infiniband: update hfi1 to use remap_vmalloc_range() Lorenzo Stoakes (ARM)
2026-09-14 17:39 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 12/40] selinux: reject writable opens of policy file, drop mmap shared/write check Lorenzo Stoakes (ARM)
2026-09-14 17:57 ` sashiko-bot
2026-09-14 19:57 ` Paul Moore
2026-09-14 14:57 ` [PATCH v2 13/40] ALSA: pcm: use vm_insert_page() to map PCM status page Lorenzo Stoakes (ARM)
2026-09-14 18:30 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 14/40] bpf: arena: mark arena_map_mmap() mappings VM_MIXEDMAP Lorenzo Stoakes (ARM)
2026-09-14 18:46 ` sashiko-bot
2026-09-14 23:17 ` Emil Tsalapatis
2026-09-14 14:57 ` [PATCH v2 15/40] mm/vma: add vma[_flags]_is_kernel_owned() predicates Lorenzo Stoakes (ARM)
2026-09-14 18:50 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 16/40] mm/vma: only allow mmap to clear VMA_MAYWRITE_BIT if kernel-owned Lorenzo Stoakes (ARM)
2026-09-14 19:14 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 17/40] mm/vma: add and use vma_[flags]_is_fixed_mapping Lorenzo Stoakes (ARM)
2026-09-14 19:24 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 18/40] scsi: sg: convert mmap hook to mmap_prepare and rework Lorenzo Stoakes (ARM)
2026-09-14 19:30 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 19/40] fbdev: defio: assert FBINFO_VIRTFB, drop VM_IO, add VM_MIXEDMAP Lorenzo Stoakes (ARM)
2026-09-14 19:44 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 20/40] HSI: cmt_speech: convert mmap hook to mmap_prepare, refactor Lorenzo Stoakes (ARM)
2026-09-14 20:15 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 21/40] mm/gup: error out early on !VMA_MAYREAD_BIT VMAs Lorenzo Stoakes (ARM)
2026-09-14 20:33 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 22/40] uprobes: remove VM_IO, set VM_MIXEDMAP for mapped kernel pages Lorenzo Stoakes (ARM)
2026-09-14 20:47 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 23/40] mm/mlock: clear VMA_LOCKED_MASK over mmap callback Lorenzo Stoakes (ARM)
2026-09-14 21:09 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 24/40] mm/mlock: eliminate weird VMA_IO_BIT abuse and simplify Lorenzo Stoakes (ARM)
2026-09-14 21:44 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 25/40] mm/vma: enforce that only kernel-owned mappings may set VMA_IO_BIT Lorenzo Stoakes (ARM)
2026-09-14 22:18 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 26/40] mm: remove VMA_IO_BIT check in vma[_flags]_is_kernel_owned() Lorenzo Stoakes (ARM)
2026-09-14 22:09 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 27/40] mm: remove hugetlb_inline.h Lorenzo Stoakes (ARM)
2026-09-14 22:09 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 28/40] mm: rename is_vm_hugetlb_page() to vma_is_hugetlb() Lorenzo Stoakes (ARM)
2026-09-14 14:57 ` [PATCH v2 29/40] mm: drop some redundant checks around hugetlb VMAs Lorenzo Stoakes (ARM)
2026-09-14 22:08 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 30/40] mm/madvise: update is_valid_guard_vma() to use vma_can_merge() Lorenzo Stoakes (ARM)
2026-09-14 22:14 ` sashiko-bot [this message]
2026-09-14 14:57 ` [PATCH v2 31/40] mm/vma: introduce vma[_flags]_is_persistent() Lorenzo Stoakes (ARM)
2026-09-14 22:12 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 32/40] mm/uffd: use predicates for userfaultfd checks Lorenzo Stoakes (ARM)
2026-09-14 22:16 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 33/40] mm/madvise: use predicates for madvise(..., MADV_DOFORK) Lorenzo Stoakes (ARM)
2026-09-14 22:18 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 34/40] mm: eliminate VMA_SPECIAL_FLAGS usage when hugetlb explicitly tested Lorenzo Stoakes (ARM)
2026-09-14 22:21 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 35/40] mm: eliminate VMA_SPECIAL_FLAGS check in lru_gen_look_around() Lorenzo Stoakes (ARM)
2026-09-14 22:22 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 36/40] mm: avoid use of VMA_SPECIAL_FLAGS in migrate_vma_setup() Lorenzo Stoakes (ARM)
2026-09-14 22:23 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 37/40] mm: eliminate VM_SPECIAL, VMA_SPECIAL_FLAGS Lorenzo Stoakes (ARM)
2026-09-14 22:19 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 38/40] fuse: dax: do not set VM_MIXEDMAP Lorenzo Stoakes (ARM)
2026-09-14 22:30 ` sashiko-bot
2026-09-14 14:57 ` [PATCH v2 39/40] mm/huge_memory: remove vma_is_special_huge() Lorenzo Stoakes (ARM)
2026-09-14 22:26 ` sashiko-bot
2026-09-14 14:58 ` [PATCH v2 40/40] mm/vma: introduce and use vma[_flags]_can_gup() Lorenzo Stoakes (ARM)
2026-09-14 22:25 ` sashiko-bot
2026-09-15 1:08 ` [PATCH v2 00/40] mm: make VMA flag semantics explicit, eliminate VM_SPECIAL Andrew Morton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260914221450.4A33D1F000FF@smtp.kernel.org \
--to=sashiko-bot@kernel.org \
--cc=agordeev@linux.ibm.com \
--cc=borntraeger@linux.ibm.com \
--cc=bpf@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=gor@linux.ibm.com \
--cc=hca@linux.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.linux.dev \
--cc=linux-perf-users@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=ljs@kernel.org \
--cc=maz@kernel.org \
--cc=oupton@kernel.org \
--cc=sashiko-reviews@lists.linux.dev \
--cc=selinux@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).