From: Oleg Nesterov <oleg@redhat.com>
To: Pu Lehui <pulehui@huaweicloud.com>
Cc: mhiramat@kernel.org, peterz@infradead.org,
akpm@linux-foundation.org, Liam.Howlett@oracle.com,
lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com,
pfalcato@suse.de, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, pulehui@huawei.com
Subject: Re: [RFC PATCH v2 1/2] mm/mremap: Fix uprobe anon page be overwritten when expanding vma during mremap
Date: Tue, 27 May 2025 19:20:18 +0200 [thread overview]
Message-ID: <20250527172018.GF8333@redhat.com> (raw)
In-Reply-To: <fcb3b061-ca4b-44d7-a9fc-ecd0713c3fda@huaweicloud.com>
Hi Lehui,
On 05/28, Pu Lehui wrote:
>
> On 2025/5/27 22:23, Oleg Nesterov wrote:
> >Well, I leave this to you / Lorenzo / David, but...
> >
> >On 05/27, Pu Lehui wrote:
> >>
> >>Fixes: 78a320542e6c ("uprobes: Change valid_vma() to demand VM_MAYEXEC rather than VM_EXEC")
> >
> >I don't think that commit could cause this problem.
>
> Hi Oleg,
>
> Me too! I was test that before and after commit 78a320542e6c, so call it the
> `directly related commit`.
I feel I am totally confused...
but _may be_ you have used the initial reproducer which used PROT_NONE in
void *addr2 = mmap(NULL, 2 * 4096, PROT_NONE, MAP_PRIVATE, fd, 0);
?
If yes. I _think_ we should have the same problem with or without 78a320542e6c,
just you need to s/PROT_NONE/PROT_EXEC/.
> In fact, I think the issue was introduced in the
> original commit 2b1444983508 ("uprobes, mm, x86: Add the ability to install
> and remove uprobes breakpoints") # v3.5-rc1.
probably yes... Damn I don't know ;)
Oleg.
next prev parent reply other threads:[~2025-05-27 17:21 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-27 13:23 [RFC PATCH v2 0/2] Fix uprobe anon page be overwritten during mremap Pu Lehui
2025-05-27 13:23 ` [RFC PATCH v2 1/2] mm/mremap: Fix uprobe anon page be overwritten when expanding vma " Pu Lehui
2025-05-27 13:34 ` Lorenzo Stoakes
2025-05-27 15:17 ` Oleg Nesterov
2025-05-27 15:27 ` Lorenzo Stoakes
2025-05-27 15:29 ` Lorenzo Stoakes
2025-05-27 16:29 ` Pu Lehui
2025-05-27 14:23 ` Oleg Nesterov
2025-05-27 16:32 ` Pu Lehui
2025-05-27 16:37 ` Lorenzo Stoakes
2025-05-27 16:52 ` Pu Lehui
2025-05-27 17:20 ` Oleg Nesterov [this message]
2025-05-29 15:09 ` Pu Lehui
2025-05-29 15:12 ` Lorenzo Stoakes
2025-05-27 15:30 ` Oleg Nesterov
2025-05-27 15:33 ` Lorenzo Stoakes
2025-05-27 15:52 ` Oleg Nesterov
2025-05-27 16:41 ` Pu Lehui
2025-05-27 16:35 ` Pu Lehui
2025-05-27 13:23 ` [RFC PATCH v2 2/2] mm/mremap: Expose abnormal new_pte during move_ptes Pu Lehui
2025-05-27 14:24 ` Oleg Nesterov
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