Thread (2 messages) 2 messages, 2 authors, 2020-08-27

Re: [PATCH v11 25/25] x86/cet/shstk: Add arch_prctl functions for shadow stack

From: Florian Weimer <hidden>
Date: 2020-08-27 13:29:09
Also in: linux-arch, linux-doc, linux-mm, lkml

Possibly related (same subject, not in this thread)

* Dave Martin:

You're right that this has implications: for i386, libc probably pulls
more arguments off the stack than are really there in some situations.
This isn't a new problem though.  There are already generic prctls with
fewer than 4 args that are used on x86.
As originally posted, glibc prctl would have to know that it has to pull
an u64 argument off the argument list for ARCH_X86_CET_DISABLE.  But
then the u64 argument is a problem for arch_prctl as well.

Thanks,
Florian
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