Public bug reported: I had recent discussion with kernel team regarding support or not BTF in HWE kernels (Bionic and Focal). Having CONFIG_DEBUG_INFO_BTF option enabled for HWE kernels (v4.4 and v.4.8) would allow eBPF based code (powered by libbpf or not) to be RO.CE (https://github.com/rafaeldtinoco/portablebpf for more information).
By allowing runtime relocations, using provided BTF, libbpf binaries might end up running, without modifications, in different kernel versions (from Bionic HWE v5.4 kernel to Hirsute v5.11). A good example would be to support tools such as: https://github.com/aquasecurity/tracee/discussions/713#discussioncomment-665641 An ebpf powered backend for a containers security solution. Considering: $ rmadisonb dwarves dwarves | 1.9-1 | precise/universe | amd64 dwarves | 1.10-2 | trusty | amd64 dwarves | 1.10-2.1 | xenial/universe | amd64 dwarves | 1.10-2.1build1 | bionic/universe | amd64 dwarves | 1.15-2 | focal/universe | amd64 dwarves | 1.17-1 | groovy/universe | amd64 dwarves | 1.20-1 | hirsute/universe | amd64 dwarves | 1.20-1 | impish/universe | amd64 And the fact that the 'pahole' binary, from dwarves package, is the one to blame, not to have CONFIG_DEBUG_INFO_BTF available, for this bug to be solved we would have to provide a backport of dwarves (at least 1.17-1) to Bionic and Focal. It could have another name (not to mess with original dwarves package and its dependencies) and it is unclear if it needs to be in [main] or [universe]. Question: Would have dwarves backported in -backports be enough for Bionic and Focal HWE kernels compilation to have CONFIG_DEBUG_INFO_BTF enabled ? ** Affects: dwarves-dfsg (Ubuntu) Importance: Undecided Status: New ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Affects: dwarves-dfsg (Ubuntu Bionic) Importance: Undecided Status: Confirmed ** Affects: linux (Ubuntu Bionic) Importance: Undecided Status: Confirmed ** Affects: dwarves-dfsg (Ubuntu Focal) Importance: Undecided Status: Confirmed ** Affects: linux (Ubuntu Focal) Importance: Undecided Status: Confirmed ** Affects: dwarves-dfsg (Ubuntu Groovy) Importance: Undecided Status: Fix Released ** Affects: linux (Ubuntu Groovy) Importance: Undecided Status: Fix Released ** Also affects: linux (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Groovy) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Groovy) Status: New => Fix Committed ** Changed in: linux (Ubuntu Groovy) Status: Fix Committed => Fix Released ** Changed in: linux (Ubuntu Focal) Status: New => Confirmed ** Changed in: linux (Ubuntu Bionic) Status: New => Confirmed ** Summary changed: - HWE kernels should enable BTF support to enable new eBPF based code + HWE kernels should enable BTF support to enable eBPF RO.CE support ** Also affects: dwarves-dfsg (Ubuntu) Importance: Undecided Status: New ** Changed in: dwarves-dfsg (Ubuntu Groovy) Status: New => Fix Released ** Changed in: dwarves-dfsg (Ubuntu Focal) Status: New => Confirmed ** Changed in: dwarves-dfsg (Ubuntu Bionic) Status: New => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1926330 Title: HWE kernels should enable BTF support to enable eBPF RO.CE support Status in dwarves-dfsg package in Ubuntu: New Status in linux package in Ubuntu: Incomplete Status in dwarves-dfsg source package in Bionic: Confirmed Status in linux source package in Bionic: Confirmed Status in dwarves-dfsg source package in Focal: Confirmed Status in linux source package in Focal: Confirmed Status in dwarves-dfsg source package in Groovy: Fix Released Status in linux source package in Groovy: Fix Released Bug description: I had recent discussion with kernel team regarding support or not BTF in HWE kernels (Bionic and Focal). Having CONFIG_DEBUG_INFO_BTF option enabled for HWE kernels (v4.4 and v.4.8) would allow eBPF based code (powered by libbpf or not) to be RO.CE (https://github.com/rafaeldtinoco/portablebpf for more information). By allowing runtime relocations, using provided BTF, libbpf binaries might end up running, without modifications, in different kernel versions (from Bionic HWE v5.4 kernel to Hirsute v5.11). A good example would be to support tools such as: https://github.com/aquasecurity/tracee/discussions/713#discussioncomment-665641 An ebpf powered backend for a containers security solution. Considering: $ rmadisonb dwarves dwarves | 1.9-1 | precise/universe | amd64 dwarves | 1.10-2 | trusty | amd64 dwarves | 1.10-2.1 | xenial/universe | amd64 dwarves | 1.10-2.1build1 | bionic/universe | amd64 dwarves | 1.15-2 | focal/universe | amd64 dwarves | 1.17-1 | groovy/universe | amd64 dwarves | 1.20-1 | hirsute/universe | amd64 dwarves | 1.20-1 | impish/universe | amd64 And the fact that the 'pahole' binary, from dwarves package, is the one to blame, not to have CONFIG_DEBUG_INFO_BTF available, for this bug to be solved we would have to provide a backport of dwarves (at least 1.17-1) to Bionic and Focal. It could have another name (not to mess with original dwarves package and its dependencies) and it is unclear if it needs to be in [main] or [universe]. Question: Would have dwarves backported in -backports be enough for Bionic and Focal HWE kernels compilation to have CONFIG_DEBUG_INFO_BTF enabled ? 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