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Message-ID: <Y/PWjCAxKcahq98B@johallen-workstation>
Date: Mon, 20 Feb 2023 14:22:36 -0600
From: John Allen <john.allen@....com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
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Subject: Re: [PATCH v6 00/41] Shadow stacks for userspace
On Sat, Feb 18, 2023 at 01:13:52PM -0800, Rick Edgecombe wrote:
> I left tested-by tags in place per discussion with testers. Testers, please
> retest.
v6 is still working well on my AMD system (Dell PowerEdge
R6515 w/ EPYC 7713).
The selftests run cleanly:
[INFO] new_ssp = 7f53069ffff8, *new_ssp = 7f5306a00001
[INFO] changing ssp from 7f53071ffff0 to 7f53069ffff8
[INFO] ssp is now 7f5306a00000
[OK] Shadow stack pivot
[OK] Shadow stack faults
[INFO] Corrupting shadow stack
[INFO] Generated shadow stack violation successfully
[OK] Shadow stack violation test
[INFO] Gup read -> shstk access success
[INFO] Gup write -> shstk access success
[INFO] Violation from normal write
[INFO] Gup read -> write access success
[INFO] Violation from normal write
[INFO] Gup write -> write access success
[INFO] Cow gup write -> write access success
[OK] Shadow gup test
[INFO] Violation from shstk access
[OK] mprotect() test
[OK] Userfaultfd test
[OK] 32 bit test
And I can see the control protection messages in dmesg when
running the shstk violation test from here:
https://gitlab.com/cet-software/cet-smoke-test
ld-linux-x86-64[51598] control protection ip:401139 sp:7ffd68b1b7c8 ssp:7fb433578fd8 error:1(near ret) in shstk1[401000+1000]
Tested-by: John Allen <john.allen@....com>
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