Page MenuHomeFreeBSD
Differential D18511

Pass VM_PROT_EXECUTE to vm_fault for instruction faults
ClosedPublic
Actions

Authored by andrew on Dec 11 2018, 10:58 AM.
Tags
None
Referenced Files
Unknown Object (File)
Wed, Oct 15, 1:15 PM
Unknown Object (File)
Wed, Oct 15, 1:15 PM
Unknown Object (File)
Wed, Oct 15, 1:14 PM
Unknown Object (File)
Wed, Oct 15, 2:18 AM
Unknown Object (File)
Wed, Sep 24, 3:02 AM
Unknown Object (File)
Mon, Sep 22, 11:56 PM
Unknown Object (File)
Aug 25 2025, 9:55 AM
Unknown Object (File)
Aug 13 2025, 8:51 PM
View All 94 Files
Subscribers
emaste
imp

Details

Reviewers
manu
Group Reviewers
arm64
Commits
rS352440: MFC r342552:
rS342552: Pass VM_PROT_EXECUTE to vm_fault for instruction faults.
Summary

We need to tell vm_fault the reason for the fault was because we tried
to execute from the memory location. Without this it may return with
success as we only request read-only memory, then we return to the same
location and try to execute from the same memory address. This leads to
an infinite loop raising the same fault and returning to the same
invalid location.

Diff Detail

Repository
rS FreeBSD src repository - subversion
Lint
Lint Not Applicable
Unit
Tests Not Applicable

Event Timeline

andrew created this revision.Dec 11 2018, 10:58 AM
Herald added a subscriber: emaste. · View Herald TranscriptDec 11 2018, 10:58 AM
Harbormaster completed remote builds in B21492: Diff 51862.Dec 11 2018, 10:58 AM
emaste added a comment.Dec 11 2018, 11:11 AM

Seems reasonable.

sys/arm64/arm64/trap.c
154 ↗(On Diff #51862)

How about bool?

andrew marked an inline comment as done.Dec 11 2018, 11:15 AM
andrew added inline comments.
sys/arm64/arm64/trap.c
154 ↗(On Diff #51862)

I thought about that but decided to keep with the existing style, lower is also a bool.

This revision was not accepted when it landed; it landed in state Needs Review.Dec 27 2018, 2:15 PM
Closed by commit rS342552: Pass VM_PROT_EXECUTE to vm_fault for instruction faults. (authored by andrew). · Explain Why
This revision was automatically updated to reflect the committed changes.
Herald added a subscriber: imp. · View Herald TranscriptDec 27 2018, 2:15 PM
andrew added a commit: rS352440: MFC r342552:.Sep 17 2019, 10:01 AM

Revision Contents
Changeset List

PathSize
head/
sys/
arm64/
arm64/
10 lines

Diff 52336

View Options

head/sys/arm64/arm64/trap.c

Loading...