6:30 p.m.
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Fedora Update Notification
FEDORA-2020-b315b7eeae
2020-12-04 00:30:05.645537
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Name : dwarves
Product : Fedora 32
Version : 1.19
Release : 1.fc32
URL : http://acmel.wordpress.com
Summary : Debugging Information Manipulation Tools (pahole & friends)
Description :
dwarves is a set of tools that use the debugging information inserted in
ELF binaries by compilers such as GCC, used by well known debuggers such as
GDB, and more recent ones such as systemtap.
Utilities in the dwarves suite include pahole, that can be used to find
alignment holes in structs and classes in languages such as C, C++, but not
limited to these.
It also extracts other information such as CPU cacheline alignment, helping
pack those structures to achieve more cache hits.
These tools can also be used to encode and read the BTF type information format
used with the Linux kernel bpf syscall, using 'pahole -J' and 'pahole -F
btf'.
A diff like tool, codiff can be used to compare the effects changes in source
code generate on the resulting binaries.
Another tool is pfunct, that can be used to find all sorts of information about
functions, inlines, decisions made by the compiler about inlining, etc.
One example of pfunct usage is in the fullcircle tool, a shell that drivers
pfunct to generate compileable code out of a .o file and then build it using
gcc, with the same compiler flags, and then use codiff to make sure the
original .o file and the new one generated from debug info produces the same
debug info.
Pahole also can be used to use all this type information to pretty print raw data
according to command line directions.
Headers can have its data format described from debugging info and offsets from
it can be used to further format a number of records.
The btfdiff utility compares the output of pahole from BTF and DWARF to make
sure they produce the same results.
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Update Information:
New release: 1.19 - Split BTF - DWARF workarounds for DW_AT_declaration -
Support cross-compiled ELF binaries with different endianness - Support showing
typedefs for anonymous types - Speedups using libbpf algorithms - See
changes-v1.19 for a complete and more detailed list of changes
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ChangeLog:
* Fri Nov 20 2020 Arnaldo Carvalho de Melo <acme(a)redhat.com> - 1.19-1
- New release: 1.19
- Split BTF
- DWARF workarounds for DW_AT_declaration
- Support cross-compiled ELF binaries with different endianness
- Support showing typedefs for anonymous types
- Speedups using libbpf algorithms
- See changes-v1.19 for a complete and more detailed list of changes
* Fri Oct 2 2020 Arnaldo Carvalho de Melo <acme(a)redhat.com> - 1.18-1
- New release: 1.18
- Use debugging info to pretty print raw data
- Store percpu variables in vmlinux BTF.
- Fixes to address segfaults on the gdb testsuite binaries
- Bail out on partial units for now, avoiding segfaults and providing warning to user.
* Mon Aug 31 2020 - Zamir SUN <sztsian(a)gmail.com> - 1.17-4
- Fix FTBFS
- Resolves: bug 1863459
* Sat Aug 1 2020 Fedora Release Engineering <releng(a)fedoraproject.org> - 1.17-3
- Second attempt - Rebuilt for
https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Mon Jul 27 2020 Fedora Release Engineering <releng(a)fedoraproject.org> - 1.17-2
- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Fri Mar 13 2020 Arnaldo Carvalho de Melo <acme(a)redhat.com> - 1.17-1
- New release: 1.17
- Support raw BTF as available in /sys/kernel/btf/vmlinux.
- When the sole argument passed isn't a file, take it as a class name:
- Do not require a class name to operate without a file name.
- Make --find_pointers_to consider unions:
- Make --contains and --find_pointers_to honour --unions
- Add support for finding pointers to void:
- Make --contains and --find_pointers_to to work with base types:
- Make --contains look for more than just unions, structs:
- Consider unions when looking for classes containing some class:
- Introduce --unions to consider just unions:
- Fix -m/--nr_methods - Number of functions operating on a type pointer
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-b315b7eeae' at the command
line. For more information, refer to the dnf documentation available at
http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
https://fedoraproject.org/keys
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