Commit 5ad0a415 authored Mar 07, 2022 by KP Singh Committed by Andrii Nakryiko Mar 07, 2022

bpf/docs: Update vmtest docs for static linking



Dynamic linking when compiling on the host can cause issues when the
libc version does not match the one in the VM image. Update the
docs to explain how to do this.

Before:
  ./vmtest.sh -- ./test_progs -t test_ima
  ./test_progs: /usr/lib/libc.so.6: version `GLIBC_2.33' not found (required by ./test_progs)

After:

  LDLIBS=-static ./vmtest.sh -- ./test_progs -t test_ima
  test_ima:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Reported-by: "Geyslan G. Bem" <geyslan@gmail.com>
Signed-off-by: KP Singh <kpsingh@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220307133048.1287644-1-kpsingh@kernel.org

parent 4989135a

tools/testing/selftests/bpf/README.rst

+8 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,14 @@ For more information on about using the script, run:

		$ tools/testing/selftests/bpf/vmtest.sh -h

		In case of linker errors when running selftests, try using static linking:

		.. code-block:: console

		$ LDLIBS=-static vmtest.sh

		.. note:: Some distros may not support static linking.

		.. note:: The script uses pahole and clang based on host environment setting.
		If you want to change pahole and llvm, you can change `PATH` environment
		variable in the beginning of script.