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selftests/x86/vdso: Fix no-vDSO segfaults

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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
This commit is contained in:
Andy Lutomirski
2020-03-19 14:30:56 -07:00
committed by Borislav Petkov
parent fb33c6510d
commit 07f24dc95d
2 changed files with 20 additions and 0 deletions
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5
tools/testing/selftests/x86/test_vdso.c
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@@ -259,6 +259,11 @@ static void test_one_clock_gettime(int clock, const char *name)
static void test_clock_gettime(void)
{
if (!vdso_clock_gettime) {
printf("[SKIP]\tNo vDSO, so skipping clock_gettime() tests\n");
return;
}
for (int clock = 0; clock < sizeof(clocknames) / sizeof(clocknames[0]);
clock++) {
test_one_clock_gettime(clock, clocknames[clock]);