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test_vdso would try to call a NULL pointer if the vDSO was missing. vdso_restorer_32 hit a genuine failure: trying to use the kernel-provided signal restorer doesn't work if the vDSO is missing. Skip the test if the vDSO is missing, since the test adds no particular value in that case. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/618ea7b8c55b10d08b1cb139e9a3a957934b8647.1584653439.git.luto@kernel.org