From: Oleg Nesterov <oleg@redhat.com>
To: Alistair Popple <apopple@nvidia.com>,
Andrew Morton <akpm@linux-foundation.org>,
Byungchul Park <byungchul@sk.com>,
David Hildenbrand <david@kernel.org>,
Gregory Price <gourry@gourry.net>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Matthew Brost <matthew.brost@intel.com>,
Rakie Kim <rakie.kim@sk.com>,
Ying Huang <ying.huang@linux.alibaba.com>,
Zi Yan <ziy@nvidia.com>
Cc: Jann Horn <jannh@google.com>, Kees Cook <kees@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] mm/mempolicy: kernel_migrate_pages: fix race between security checks and suid exec
Date: Sun, 24 May 2026 21:29:50 +0200 [thread overview]
Message-ID: <ahNRrgSaDa3Tbws0@redhat.com> (raw)
In-Reply-To: <ahMt6xyUNnacZU8-@redhat.com>
On 05/24, Oleg Nesterov wrote:
>
> Hopefully sashiko.dev will take a look too ;)
See https://sashiko.dev/#/patchset/ahMt6xyUNnacZU8-%40redhat.com
Thanks Sashiko, let me reply.
As for reply to 3/4:
I honestly think this is not a problem... but a) I will think
again, and b) I rely on review from mm experts anyway.
The main motivation for this patch is that we can create a common
helper for find_mm_struct() and kernel_migrate_pages(), but it is
not strictly necessary.
As for reply to 4/4:
Yes! And I have already mentioned this in 0/4 and in the previous
discussions.
Plus (say) proc_coredump_filter_write() which relies on the open-time
checks and don't use ptrace_may_access() at all. This looks wrong.
But this need other changes/discussions, so I think we can ignore this
comment.
Oleg.
prev parent reply other threads:[~2026-05-24 19:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-24 16:57 [PATCH 0/4] mm/mempolicy: kernel_migrate_pages: fix race between security checks and suid exec Oleg Nesterov
2026-05-24 16:57 ` [PATCH 1/4] mm/mempolicy: kernel_migrate_pages: simplify the usage of put_task_struct() Oleg Nesterov
2026-05-25 2:18 ` Gregory Price
2026-05-25 2:20 ` Gregory Price
2026-05-25 8:27 ` Oleg Nesterov
2026-05-24 16:58 ` [PATCH 2/4] mm/mempolicy: kernel_migrate_pages: use find_get_task_by_vpid() Oleg Nesterov
2026-05-24 16:58 ` [PATCH 3/4] mm/mempolicy: kernel_migrate_pages: check ptrace_may_access() after nodes_and() Oleg Nesterov
2026-05-24 16:58 ` [PATCH 4/4] mm/mempolicy: kernel_migrate_pages: fix race between security checks and suid exec Oleg Nesterov
2026-05-24 19:29 ` Oleg Nesterov [this message]
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