selftests/bpf: make cmdline_contains stricter

cmdline_contains is used by BPF selftests to check the presence of
specific kernel commandline parameters, but it currently suffers from
two issues:
- the read commandline isn't NULL terminated right after the read data
  but only at the end of the buffer, leaving uninitialized bytes that
  are then possibly tokenized
- the comparison of found tokens is done based on the size of found
  token. This could lead to too-short-but-matching tokens to wrongly
  match the search pattern.

Enforce stricter checks in cmdline_contains to avoid accidental matches.

Fixes: 399f6185a1c0 ("selftests/bpf: Fix selftests broken by mitigations=off")
Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Link: https://lore.kernel.org/r/20260903-kasan-v9-6-2407fe99255a@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

0 files changed, 0 insertions, 0 deletions