From: Oleg Nesterov <oleg@redhat.com>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>,
linux-trace-kernel@vger.kernel.org, rostedt@goodmis.org,
peterz@infradead.org, mingo@redhat.com, bpf@vger.kernel.org,
jolsa@kernel.org, paulmck@kernel.org, clm@meta.com
Subject: Re: [PATCH 02/12] uprobes: grab write mmap lock in unapply_uprobe()
Date: Tue, 25 Jun 2024 16:49:52 +0200 [thread overview]
Message-ID: <20240625144952.GA21558@redhat.com> (raw)
In-Reply-To: <20240625102925.665f2fa3b39dc7602b1321d8@kernel.org>
On 06/25, Masami Hiramatsu wrote:
>
> On Mon, 24 Jun 2024 17:21:34 -0700
> Andrii Nakryiko <andrii@kernel.org> wrote:
>
> > Given unapply_uprobe() can call remove_breakpoint() which eventually
> > calls uprobe_write_opcode(), which can modify a set of memory pages and
> > expects mm->mmap_lock held for write, it needs to have writer lock.
>
> Oops, it is an actual bug, right?
Why?
So far I don't understand this change. Quite possibly I missed something,
but in this case the changelog should explain the problem more clearly.
Oleg.
next prev parent reply other threads:[~2024-06-25 14:51 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-25 0:21 [PATCH 00/12] uprobes: add batched register/unregister APIs and per-CPU RW semaphore Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 01/12] uprobes: update outdated comment Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 02/12] uprobes: grab write mmap lock in unapply_uprobe() Andrii Nakryiko
2024-06-25 1:29 ` Masami Hiramatsu
2024-06-25 14:49 ` Oleg Nesterov [this message]
2024-06-25 17:37 ` Andrii Nakryiko
2024-06-25 19:07 ` Oleg Nesterov
2024-06-26 16:38 ` Andrii Nakryiko
2024-06-25 10:50 ` Oleg Nesterov
2024-06-25 0:21 ` [PATCH 03/12] uprobes: simplify error handling for alloc_uprobe() Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 04/12] uprobes: revamp uprobe refcounting and lifetime management Andrii Nakryiko
2024-06-25 14:44 ` Oleg Nesterov
2024-06-25 17:30 ` Andrii Nakryiko
2024-06-26 6:02 ` kernel test robot
2024-06-26 16:39 ` Andrii Nakryiko
2024-06-27 2:29 ` Masami Hiramatsu
2024-06-27 16:43 ` Andrii Nakryiko
2024-07-01 21:59 ` Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 05/12] uprobes: move offset and ref_ctr_offset into uprobe_consumer Andrii Nakryiko
2024-06-27 3:06 ` Masami Hiramatsu
2024-06-25 0:21 ` [PATCH 06/12] uprobes: add batch uprobe register/unregister APIs Andrii Nakryiko
2024-06-26 11:27 ` Jiri Olsa
2024-06-26 16:44 ` Andrii Nakryiko
2024-06-27 13:04 ` Masami Hiramatsu
2024-06-27 16:47 ` Andrii Nakryiko
2024-06-28 6:28 ` Masami Hiramatsu
2024-06-28 16:34 ` Andrii Nakryiko
2024-06-29 23:30 ` Masami Hiramatsu
2024-07-01 17:55 ` Andrii Nakryiko
2024-07-01 22:15 ` Andrii Nakryiko
2024-07-02 1:01 ` Masami Hiramatsu
2024-07-02 1:34 ` Andrii Nakryiko
2024-07-02 15:19 ` Masami Hiramatsu
2024-07-02 16:53 ` Steven Rostedt
2024-07-02 21:23 ` Andrii Nakryiko
2024-07-02 23:16 ` Masami Hiramatsu
2024-06-25 0:21 ` [PATCH 07/12] uprobes: inline alloc_uprobe() logic into __uprobe_register() Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 08/12] uprobes: split uprobe allocation and uprobes_tree insertion steps Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 09/12] uprobes: batch uprobes_treelock during registration Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 10/12] uprobes: improve lock batching for uprobe_unregister_batch Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 11/12] uprobes,bpf: switch to batch uprobe APIs for BPF multi-uprobes Andrii Nakryiko
2024-06-25 0:21 ` [PATCH 12/12] uprobes: switch uprobes_treelock to per-CPU RW semaphore Andrii Nakryiko
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