https://sourceware.org/bugzilla/show_bug.cgi?id=34030
Aaron Merey <amerey at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amerey at redhat dot com
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
--- Comment #7 from Aaron Merey <amerey at redhat dot com> ---
Fixed in the following commit:
commit 9d473aff2f7a81b3c8c78c94b818eb8354c79b26
Author: Pengfei Li <[email protected]>
Date: Wed Aug 12 10:28:12 2026 +0800
libdwfl: Handle kernel module sections absent from sysfs
dwfl_linux_kernel_module_section_address reads loaded kernel module
section addresses from /sys/module/<name>/sections. Some sections in
the module ELF intentionally have no corresponding sysfs file.
The kernel clears SHF_ALLOC from __versions, __version_ext_crcs, and
__version_ext_names before laying out a module. It also clears
SHF_ALLOC from .data..percpu because that section is allocated
separately, and skips zero-sized sections when creating the module
section sysfs attributes.
Treat those sections as absent from the normal runtime section layout
when opening their sysfs files fails with ENOENT. Keep accepting the
existing .data.percpu spelling while also accepting the .data..percpu
spelling used by current kernels. Other errors and missing nonzero
sections continue to abort the callback.
Add a regression test that calls the callback with a nonexistent
per-process module name. It covers the existing special cases, the
three module version sections, .data..percpu, a zero-sized section, and
the failure path for an unknown nonzero section.
Tested on Ubuntu x86-64 with:
make check TESTS=dwfl-kernel-module-section-address
https://sourceware.org/bugzilla/show_bug.cgi?id=34030
* libdwfl/linux-kernel-modules.c
(dwfl_linux_kernel_module_section_address): Handle module version
sections, .data..percpu, and zero-sized sections missing from
sysfs.
* tests/dwfl-kernel-module-section-address.c: New test.
* tests/Makefile.am (check_PROGRAMS, TESTS): Add it.
(dwfl_kernel_module_section_address_LDADD): New variable.
Signed-off-by: Pengfei Li <[email protected]>
--
You are receiving this mail because:
You are on the CC list for the bug.
