* [Bug runtime/30456] New: Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses
@ 2023-05-17 0:21 agentzh at gmail dot com
2023-05-18 5:29 ` [Bug runtime/30456] " agentzh at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: agentzh at gmail dot com @ 2023-05-17 0:21 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=30456
Bug ID: 30456
Summary: Kernel 5.18+ retired set_fs() and replaced it with the
user_access_begin/end() pair for userland memory
accesses
Product: systemtap
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: runtime
Assignee: systemtap at sourceware dot org
Reporter: agentzh at gmail dot com
Target Milestone: ---
Currently, the stap runtime does nothing for kernel 5.18+ without set_fs(),
which is wrong at least on x86 for userland accesses.
I'm preparing a fix by switching to the new replacement API,
user_access_begin() and user_access_end().
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* [Bug runtime/30456] Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses
2023-05-17 0:21 [Bug runtime/30456] New: Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses agentzh at gmail dot com
@ 2023-05-18 5:29 ` agentzh at gmail dot com
2023-08-22 1:22 ` fche at redhat dot com
2023-08-24 0:11 ` fche at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: agentzh at gmail dot com @ 2023-05-18 5:29 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=30456
--- Comment #1 from agentzh <agentzh at gmail dot com> ---
I'd propose this patch to address this issue:
https://gist.github.com/agentzh/0628614ac04f773c6662d225100924be
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* [Bug runtime/30456] Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses
2023-05-17 0:21 [Bug runtime/30456] New: Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses agentzh at gmail dot com
2023-05-18 5:29 ` [Bug runtime/30456] " agentzh at gmail dot com
@ 2023-08-22 1:22 ` fche at redhat dot com
2023-08-24 0:11 ` fche at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fche at redhat dot com @ 2023-08-22 1:22 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=30456
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fche at redhat dot com
--- Comment #2 from Frank Ch. Eigler <fche at redhat dot com> ---
unfortunately, this triggers bug #30716
It appears that if we're going to use the stac/clac wrappers around calls to
user-space access functions at all, those functions must be chosen from a
whitelist.
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* [Bug runtime/30456] Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses
2023-05-17 0:21 [Bug runtime/30456] New: Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses agentzh at gmail dot com
2023-05-18 5:29 ` [Bug runtime/30456] " agentzh at gmail dot com
2023-08-22 1:22 ` fche at redhat dot com
@ 2023-08-24 0:11 ` fche at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fche at redhat dot com @ 2023-08-24 0:11 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=30456
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
--- Comment #3 from Frank Ch. Eigler <fche at redhat dot com> ---
commit a9337abbb213e82e919e67150b31399cc49c469f
Author: Yichun Zhang (agentzh) <yichun@openresty.com>
Date: Tue May 16 17:17:07 2023 -0700
PR30456: kernel 5.18+ removed set_fs() and we should use the new
replacement, user_access_begin()/user_access_end() for userland memory
accesses.
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2023-05-17 0:21 [Bug runtime/30456] New: Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses agentzh at gmail dot com
2023-05-18 5:29 ` [Bug runtime/30456] " agentzh at gmail dot com
2023-08-22 1:22 ` fche at redhat dot com
2023-08-24 0:11 ` fche at redhat dot com
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