v1.0 backport: bpf: fix bugs in the prepend_name function #1956
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[ upstream commit ea914b6 ] In order to make BPF_PROG_RUN work with BPF_PROG_TYPE_RAW_TRACEPOINT in cilium/ebpf. Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
[ upstream commit 0e242c4 ] It looked like this particular function presented some bugs: - It would not return -ENAMETOOLONG when the buffer was filled "best-effort" because the name was not fitting. - It would never fill the first byte of the buffer, thus reducing the maximum size written by one. - It would not fill "best-effort" correctly. E.g, previously in a buffer of 4, "pizza" would have been "/piz" (when ignoring previous bug) instead of "izza". Now it tries to write the "end" of the name without a wrong "/" char. - It would behave unexpectedly when filled with more data than size of buffer. BPF unit tests were put under bpf/tests, as more can be added there in the future. The Makefile was updated so that we can share variable definition between the bpf/Makefile and the bpf/tests/Makefile file. This separation allows us not compile the test program along the rest of the BPF progs, and not ship them in the released images/archives. Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
[ upstream commit c8bcf64 ] BPF units tests are not backported to v1.0 but this still ports the bug fix in the prepend_name function as this can affect users via events. Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
[ upstream commit f08c16f ] Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
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Complete backport ready with tests as well @kkourt |
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Backport of the bugfix and tests of #1902.