Commit 630b99ab authored Mar 12, 2020 by Andy Lutomirski Committed by Borislav Petkov Mar 20, 2020

selftests/x86/ptrace_syscall_32: Fix no-vDSO segfault



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

parent 07f24dc9

tools/testing/selftests/x86/ptrace_syscall.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -414,8 +414,12 @@ int main()

		#if defined(__i386__) && (!defined(__GLIBC__) \|\| __GLIBC__ > 2 \|\| __GLIBC_MINOR__ >= 16)
		vsyscall32 = (void *)getauxval(AT_SYSINFO);
		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();

Admin message