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authorJason A. Donenfeld <Jason@zx2c4.com>2024-09-05 19:17:24 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2024-09-13 17:28:35 +0200
commit2aec90036dcd2cb7047a6e28625fba6c64756665 (patch)
treef3d2dfde755468d3ea9737bce23ff847a2cb4e7f /tools/perf/scripts/python/exported-sql-viewer.py
parent33ffa2dd0de28ded1fa856b3fb9cbf2b873d7dd0 (diff)
selftests: vDSO: ensure vgetrandom works in a time namespace
After verifying that vDSO getrandom does work, which ensures that the RNG is initialized, test to see if it also works inside of a time namespace. This is important to test, because the vvar pages get swizzled around there. If the arch code isn't careful, the RNG will appear uninitialized inside of a time namespace. Because broken code makes the RNG appear uninitialized, test that everything works by issuing a call to vgetrandom from a fork in a time namespace, and use ptrace to ensure that the actual syscall getrandom doesn't get called. If it doesn't get called, then the test succeeds. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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