From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/30716] On x86_64 get objtool warnings: call to __get_user_nocheck_1() with UACCESS enabled
Date: Wed, 25 Oct 2023 23:09:44 +0000 [thread overview]
Message-ID: <bug-30716-6586-s2nl2mDDMw@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-30716-6586@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=30716
William Cohen <wcohen at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |---
Status|RESOLVED |REOPENED
--- Comment #3 from William Cohen <wcohen at redhat dot com> ---
The x86_64 RHEL9 5.14.0 is a bit different than the newer 6.x kernels in
Fedora. The CONFIG_HAVE_UACCESS_VALIDATION was added by kernel git commit
5f3da8c08508df828235 around april 2022 and doesn't exist in the older 5.14
RHEL9 kernel. Thus, the current systemtap patch for this PR doesn't turn off
the objtool --uaccess analysis/warning in RHEL9. I looked for alternative.
The CONFIG_OBJTOOL was added to the kernel about the same time as the
CONFIG_HAVE_UACESS_VALIDATION, april 2022. For the 5.14 kernels the use of
--uaccess option for objtool is control by CONFIG_X86_SMAP,
https://elixir.bootlin.com/linux/v5.14/source/arch/x86/Kconfig#L1806. However,
it is likely that turning this off is going to cause problems for the Intel
processors that have actually have that feature enabled like the Intel IBT
support.
https://edc.intel.com/content/www/us/en/design/ipla/software-development-platforms/servers/platforms/intel-pentium-silver-and-intel-celeron-processors-datasheet-volume-1-of-2/005/intel-supervisor-mode-access-protection-smap/
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next prev parent reply other threads:[~2023-10-25 23:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-02 15:28 [Bug runtime/30716] New: " wcohen at redhat dot com
2023-08-03 19:45 ` [Bug runtime/30716] " wcohen at redhat dot com
2023-08-23 13:09 ` fche at redhat dot com
2023-10-25 23:09 ` wcohen at redhat dot com [this message]
2024-03-05 0:33 ` wcohen at redhat dot com
2024-03-07 18:55 ` wcohen at redhat dot com
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