selftests/bpf: filter by pid to avoid cross-test interference#11311
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selftests/bpf: filter by pid to avoid cross-test interference#11311kernel-patches-daemon-bpf[bot] wants to merge 2 commits intobpf-next_basefrom
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The test installs a kprobe on __sys_connect and checks that bpf_probe_write_user() can modify the syscall argument. However, any concurrent thread in any other test that calls connect() will also trigger the kprobe and have its sockaddr silently overwritten, causing flaky failures in unrelated tests. Constrain the hook to the current test process by filtering on a PID stored as a global variable in .bss. Initialize the .bss value from user space before bpf_object__load() using bpf_map__set_initial_value(), and validate the bss map value size to catch layout mismatches. No new map is introduced and the test keeps the existing non-skeleton flow. Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
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Patch 1/2 added PID filtering to the probe_user BPF program to avoid cross-test interference from the global connect() hooks. With the interference removed, drop the serial_ prefix and remove the stale TODO comment so the test can run in parallel. Tested: ./test_progs -t probe_user -v ./test_progs -j$(nproc) -t probe_user Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
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Pull request for series with
subject: selftests/bpf: filter by pid to avoid cross-test interference
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1062423