From: Jan Kratochvil <jkratochvil@azul.com>
To: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Cc: Florian Weimer <fweimer@redhat.com>,
libc-alpha@sourceware.org, Anton Kozlov <akozlov@azul.com>
Subject: Re: [PATCH] RFC: Provide a function to reset IFUNC PLTs
Date: Wed, 8 Mar 2023 18:21:18 +0800 [thread overview]
Message-ID: <ZAhhnpdGsI4hLlp9@host1.jankratochvil.net> (raw)
In-Reply-To: <2659aadc-6518-cc0e-d103-84eafcbdc3f9@linaro.org>
On Tue, 07 Mar 2023 21:07:58 +0800, Adhemerval Zanella Netto wrote:
> I am not sure if the ifunc reset will be really safe without adding CRIU
> migrate sync points, to avoid suspend execution in a context that the
> ifunc variants are already being executed or its address is being in a
> function point (for instance in PLT code).
You are right but I left the thread safety up to the caller ("Freezer"):
https://github.com/openjdk/crac/pull/41/files#diff-aeec57d804d56002f26a85359fc4ac8b48cfc249d57c656a30a63fc6bf3457adR6029
It could be moved to the glibc part.
> Besides, I also not sure if adding way to remove RELRO protection won't
> add more security issues (we can disable for sesuid binaries, but even
> though it is not a good security practice).
RELRO is removed only temporarily, it gets re-engaged. And that time other
threads should be even stopped (see above). Is it still a security issues?
Thanks,
Jan
next prev parent reply other threads:[~2023-03-08 10:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 8:04 Jan Kratochvil
2023-03-07 8:40 ` Florian Weimer
2023-03-07 13:07 ` Adhemerval Zanella Netto
2023-03-08 10:21 ` Jan Kratochvil [this message]
2023-03-08 13:04 ` Adhemerval Zanella Netto
2023-03-09 11:32 ` Jan Kratochvil
2023-03-09 15:47 ` Adhemerval Zanella Netto
2023-03-09 17:43 ` Adhemerval Zanella Netto
2023-03-16 14:38 ` Jan Kratochvil
2023-03-20 16:47 ` Adhemerval Zanella Netto
2023-03-29 12:12 ` Jan Kratochvil
2023-03-29 13:14 ` Adhemerval Zanella Netto
2023-03-13 13:59 ` Florian Weimer
2023-03-14 12:55 ` Jan Kratochvil
2023-03-14 14:49 ` Florian Weimer
2023-03-14 15:06 ` Jan Kratochvil
2023-03-08 10:23 ` Jan Kratochvil
2023-03-08 10:44 ` Florian Weimer
2023-03-08 11:03 ` Jan Kratochvil
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