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selftests/x86/ptrace_syscall_32: Fix no-vDSO segfault
author
Andy Lutomirski
<luto@kernel.org>
Thu, 12 Mar 2020 22:35:51 +0000
(15:35 -0700)
committer
Borislav Petkov
<bp@suse.de>
Fri, 20 Mar 2020 10:28:47 +0000
(11:28 +0100)
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
tools/testing/selftests/x86/ptrace_syscall.c
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diff --git
a/tools/testing/selftests/x86/ptrace_syscall.c
b/tools/testing/selftests/x86/ptrace_syscall.c
index
6f22238
..
12aaa06
100644
(file)
--- a/
tools/testing/selftests/x86/ptrace_syscall.c
+++ b/
tools/testing/selftests/x86/ptrace_syscall.c
@@
-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();