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selftests/x86/ptrace_syscall_32: Fix no-vDSO segfault 

[ Upstream commit 630b99ab60 ]

If AT_SYSINFO is not present, don't try to call a NULL pointer.

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/faaf688265a7e1a5b944d6f8bc0f6368158306d3.1584052409.git.luto@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Andy Lutomirski 2020-03-12 15:35:51 -07:00 committed by Greg Kroah-Hartman
parent dd39eadc71
commit 75434bcc65
1 changed files with 6 additions and 2 deletions
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8
tools/testing/selftests/x86/ptrace_syscall.c
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@ -414,8 +414,12 @@ int main()
#if defined(__i386__) && (!defined(__GLIBC__) || __GLIBC__ > 2 || __GLIBC_MINOR__ >= 16)
vsyscall32 = (void *)getauxval(AT_SYSINFO);
printf("[RUN]\tCheck AT_SYSINFO return regs\n");
test_sys32_regs(do_full_vsyscall32);
if (vsyscall32) {
printf("[RUN]\tCheck AT_SYSINFO return regs\n");
test_sys32_regs(do_full_vsyscall32);
} else {
printf("[SKIP]\tAT_SYSINFO is not available\n");
}
#endif
test_ptrace_syscall_restart();