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* [Bug dynamic-link/26552] New: CPU_FEATURE_USABLE_P should be more conservative
@ 2020-08-29 12:34 hjl.tools at gmail dot com
2020-09-03 11:41 ` [Bug dynamic-link/26552] " hjl.tools at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2020-08-29 12:34 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26552
Bug ID: 26552
Summary: CPU_FEATURE_USABLE_P should be more conservative
Product: glibc
Version: 2.33
Status: NEW
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: i386,x86-64
Usability of some CPU features can't be detected from user space. For
example, CR4.FSGSBASE
FSGSBASE-Enable Bit (bit 16 of CR4) — Enables the instructions RDFSBASE,
RDGSBASE, WRFSBASE, and WRGSBASE.
>From user space, we can't tell if FSGSBASE is enabled.
As the start, CPU_FEATURE_USABLE_P should return true only for new ISAs
which can be detected from user space.
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* [Bug dynamic-link/26552] CPU_FEATURE_USABLE_P should be more conservative
2020-08-29 12:34 [Bug dynamic-link/26552] New: CPU_FEATURE_USABLE_P should be more conservative hjl.tools at gmail dot com
@ 2020-09-03 11:41 ` hjl.tools at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2020-09-03 11:41 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26552
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Target Milestone|--- |2.33
Resolution|--- |FIXED
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for 2.33 by
ommit 04bba1e5d84b6fd8d3a3b006bc240cd5d241ee30
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Aug 5 13:51:56 2020 -0700
x86: Set CPU usable feature bits conservatively [BZ #26552]
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2020-08-29 12:34 [Bug dynamic-link/26552] New: CPU_FEATURE_USABLE_P should be more conservative hjl.tools at gmail dot com
2020-09-03 11:41 ` [Bug dynamic-link/26552] " hjl.tools at gmail dot com
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