From: Christoph Hellwig <hch@lst.de>
To: Luis Chamberlain <mcgrof@kernel.org>
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Subject: Re: [PATCH] kprobes: Enable tracing for mololithic kernel images
Date: Thu, 9 Jun 2022 05:48:52 +0200 [thread overview]
Message-ID: <20220609034852.GA30873@lst.de> (raw)
In-Reply-To: <YqEF6+YKqCHsWZJW@bombadil.infradead.org>
On Wed, Jun 08, 2022 at 01:26:19PM -0700, Luis Chamberlain wrote:
> No, that was removed because it has only one user.
That is only part of the story. The other part is that the overall
kernel simply does not have any business allocating exutable memory.
Executable memory is a very special concept for modules or module-like
code like kprobes, and should not be exposed as a general concept.
Especially as executable memory really should not also be writable
for security reasons. In other words, we should actually never
allocate executable memory, every. We might seal memory and then
mark it executable after having written to it, which is how modules
and kprobes are implemented on all modern Linux ports anyway.
next prev parent reply other threads:[~2022-06-09 3:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-07 23:59 [PATCH] kprobes: Enable tracing for mololithic kernel images Jarkko Sakkinen
2022-06-08 2:35 ` Guo Ren
2022-06-08 5:25 ` Jarkko Sakkinen
2022-06-08 14:21 ` Masami Hiramatsu
2022-06-08 16:12 ` Song Liu
2022-06-08 18:20 ` Song Liu
2022-06-08 20:26 ` Luis Chamberlain
2022-06-09 3:48 ` Christoph Hellwig [this message]
2022-06-09 13:24 ` Luis Chamberlain
2022-06-09 18:41 ` Edgecombe, Rick P
2022-06-09 22:48 ` Song Liu
2022-06-14 12:32 ` jarkko
2022-06-15 6:37 ` hch
2022-06-15 21:29 ` jarkko
2022-06-09 13:12 ` Jarkko Sakkinen
2022-06-09 13:23 ` Ard Biesheuvel
2022-06-12 12:18 ` Masami Hiramatsu
2022-06-14 10:54 ` Jarkko Sakkinen
[not found] ` <f7ff2a8d-4128-dac9-9768-1d98bfb06a06@csgroup.eu>
2022-06-09 22:23 ` Song Liu
2022-06-09 12:59 ` Jarkko Sakkinen
2022-06-08 16:27 ` Ard Biesheuvel
2022-06-08 18:19 ` Song Liu
2022-06-12 12:30 ` Masami Hiramatsu
2022-06-14 12:30 ` Jarkko Sakkinen
2022-06-09 5:37 ` Jarkko Sakkinen
2022-06-09 7:47 ` Russell King (Oracle)
2022-06-09 11:48 ` Jarkko Sakkinen
2022-06-09 13:44 ` Luis Chamberlain
2022-06-14 12:26 ` Jarkko Sakkinen
[not found] ` <144b7e90-5d75-7e2c-4e54-8a73f914dfdf@csgroup.eu>
2022-06-15 21:24 ` Jarkko Sakkinen
[not found] ` <f2030fb4-4978-068b-6250-5bd5b2746675@csgroup.eu>
2022-06-09 12:57 ` Jarkko Sakkinen
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