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Differential D40540

dtrace/arm64: Fix PAN handling in some dtrace operations
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Authored by markj on Jun 14 2023, 2:47 PM.
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andrew
emaste
imp

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gnn
andrew
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DTrace
arm64
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rG7d86d8ed848e: dtrace/arm64: Fix user memory access routines
rG6281147a963b: dtrace/arm64: Fix user memory access routines
Summary

Without this, various dtrace actions such as ustack() simply fail.

Sponsored by: InnovateUK

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rG FreeBSD src repository
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Tests Not Applicable

Event Timeline

markj created this revision.Jun 14 2023, 2:47 PM
Herald added a reviewer: gnn. · View Herald TranscriptJun 14 2023, 2:47 PM
Herald added subscribers: emaste, andrew, imp. · View Herald Transcript
markj requested review of this revision.Jun 14 2023, 2:47 PM
Harbormaster completed remote builds in B52050: Diff 123206.Jun 14 2023, 2:47 PM
markj added a parent revision: D40539: dtrace/arm64: Store the fault address when suppressing a page fault.Jun 14 2023, 2:47 PM
andrew added a comment.Jun 14 2023, 2:55 PM

Could uou use the ldtr* instructions here? They perform a load as if it was the user so there would be no need to disable PAN.

markj updated this revision to Diff 123207.Jun 14 2023, 3:07 PM

Use ldtr* instead of disabling PAN.

Harbormaster completed remote builds in B52051: Diff 123207.Jun 14 2023, 3:07 PM
andrew accepted this revision.Jun 14 2023, 3:08 PM
This revision is now accepted and ready to land.Jun 14 2023, 3:08 PM
Closed by commit rG6281147a963b: dtrace/arm64: Fix user memory access routines (authored by markj). · Explain WhyJun 15 2023, 4:41 PM
This revision was automatically updated to reflect the committed changes.
markj added a commit: rG6281147a963b: dtrace/arm64: Fix user memory access routines.
markj added a commit: rG7d86d8ed848e: dtrace/arm64: Fix user memory access routines.Jun 23 2023, 1:54 PM

Revision Contents
Changeset List

PathSize
sys/
cddl/
dev/
dtrace/
aarch64/
16 lines

Diff 123290

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sys/cddl/dev/dtrace/aarch64/dtrace_asm.S

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