kselftest/arm64: Validate signal ucontext in place

In handle_input_signal_copyctx() we use ASSERT_GOOD_CONTEXT() to validate
that the context we are saving meets expectations however we do this on
the saved copy rather than on the actual signal context passed in. This
breaks validation of EXTRA_CONTEXT since we attempt to validate the ABI
requirement that the additional space supplied is immediately after the
termination record in the standard context which will not be the case
after it has been copied to another location.

Fix this by doing the validation before we copy. Note that nothing actually
looks inside the EXTRA_CONTEXT at present.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220829160703.874492-3-broonie@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

tools/testing/selftests/arm64/signal/test_signals_utils.c

@@ -165,12 +165,15 @@ static bool handle_signal_ok(struct tdescr *td,
 }
 
 static bool handle_signal_copyctx(struct tdescr *td,
-				  siginfo_t *si, void *uc)
+				  siginfo_t *si, void *uc_in)
 {
+	ucontext_t *uc = uc_in;
+
+	ASSERT_GOOD_CONTEXT(uc);
+
 	/* Mangling PC to avoid loops on original BRK instr */
-	((ucontext_t *)uc)->uc_mcontext.pc += 4;
+	uc->uc_mcontext.pc += 4;
 	memcpy(td->live_uc, uc, td->live_sz);
-	ASSERT_GOOD_CONTEXT(td->live_uc);
 	td->live_uc_valid = 1;
 	fprintf(stderr,
 		"GOOD CONTEXT grabbed from sig_copyctx handler\n");