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| author |   Jason A. Donenfeld <Jason@zx2c4.com> | 2024-09-05 19:17:24 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2024-09-13 17:28:35 +0200 |
| commit | 2aec90036dcd2cb7047a6e28625fba6c64756665 (patch) | |
| tree | f3d2dfde755468d3ea9737bce23ff847a2cb4e7f /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | selftests: vDSO: quash clang omitted parameter warning in getrandom test (diff) | |
| download | wireguard-linux-2aec90036dcd2cb7047a6e28625fba6c64756665.tar.xz wireguard-linux-2aec90036dcd2cb7047a6e28625fba6c64756665.zip | |
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>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
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