linux-kernel - [PATCH v4 0/4] Bring back vmlinux.h generation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 22 Jun 2023 21:14:01 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Clark <james.clark@....com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Yang Jihong <yangjihong1@...wei.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH v4 0/4] Bring back vmlinux.h generation

Commit 760ebc45746b ("perf lock contention: Add empty 'struct rq' to
satisfy libbpf 'runqueue' type verification") inadvertently created a
declaration of 'struct rq' that conflicted with a generated
vmlinux.h's:

```
util/bpf_skel/lock_contention.bpf.c:419:8: error: redefinition of 'rq'
struct rq {};
       ^
/tmp/perf/util/bpf_skel/.tmp/../vmlinux.h:45630:8: note: previous definition is here
struct rq {
       ^
1 error generated.
```

Fix the issue by moving the declaration to vmlinux.h. So this can't
happen again, bring back build support for generating vmlinux.h then
add build tests.

v4. Rebase and add Namhyung and Jiri's acked-by.
v3. Address Namhyung's comments on filtering ELF files with readelf.
v2. Rebase on perf-tools-next. Add Andrii's acked-by. Add patch to
    filter out kernels that lack a .BTF section and cause the build to
    break.

Ian Rogers (4):
  perf build: Add ability to build with a generated vmlinux.h
  perf bpf: Move the declaration of struct rq
  perf test: Add build tests for BUILD_BPF_SKEL
  perf build: Filter out BTF sources without a .BTF section

 tools/perf/Makefile.config                    |  4 ++
 tools/perf/Makefile.perf                      | 39 ++++++++++++++++++-
 tools/perf/tests/make                         |  4 ++
 tools/perf/util/bpf_skel/.gitignore           |  1 +
 .../perf/util/bpf_skel/lock_contention.bpf.c  |  2 -
 .../util/bpf_skel/{ => vmlinux}/vmlinux.h     | 10 +++++
 6 files changed, 57 insertions(+), 3 deletions(-)
 rename tools/perf/util/bpf_skel/{ => vmlinux}/vmlinux.h (90%)

-- 
2.41.0.162.gfafddb0af9-goog