test: add CFI test for unaligned lpad and update existing tests

Author: XuJiandong

tests/programs/_build_cfi_native.sh

@@ -25,4 +25,5 @@ build cfi_lpad_func_sig_zero.S cfi_lpad_func_sig_zero
 build cfi_lpad_func_sig_failed.S cfi_lpad_func_sig_failed
 build cfi_ss_only_pop.S cfi_ss_only_pop
 build cfi_ss_popchk_failed.S cfi_ss_popchk_failed
+build cfi_lpad_align_failed.S cfi_lpad_align_failed
 

tests/programs/cfi_lpad_align_failed

@@ -0,0 +1,19 @@
+
+
+.include "cfi_macro.h"
+
+gnu_property_cfi_ss 1
+
+.text
+.global _start
+_start:
+    la t1, func
+    c.jalr t1
+    
+.globl func
+.type func,@function
+# no alignment
+# .balign 4
+func:
+  lpad 0
+  ret

tests/programs/cfi_lpad_align_failed.S

@@ -13,7 +13,7 @@ _start:
 
     la t1, exit
     c.jr t1
-    
+
     exit_imm 1
 
 .globl func
@@ -29,5 +29,11 @@ func:
 # lpad checks alignment with 4
 .balign 4
 exit:
+    lpad 0
+    # dummy lpad == no-op
+    lpad 0
+    li t0, 100
+    lpad 0
+    li t0, 200
     lpad 0
     exit_imm 0

tests/programs/cfi_lpad_unlabeled

@@ -25,6 +25,12 @@ _start:
     sspush t0
     sspopchk t0
 
+    c.sspush ra
+    sspopchk ra
+
+    sspush t0
+    c.sspopchk t0
+
     li t0, 42
     beq ra, t0, 1f
     exit_imm 2

tests/programs/cfi_lpad_unlabeled.S

@@ -39,7 +39,6 @@ pub fn test_cfi_ss_not_active() {
 #[test]
 pub fn test_cfi_ss_stack_downto_zero() {
     let ret = run("tests/programs/cfi_ss_stack_downto_zero");
-    assert!(ret.is_err());
     assert!(matches!(ret, Err(Error::CFIShadowStackOutOfStack)));
 }
 
@@ -64,7 +63,6 @@ pub fn test_cfi_lpad_not_active() {
 #[test]
 pub fn test_cfi_lpad_unlabeled_failed() {
     let ret = run("tests/programs/cfi_lpad_unlabeled_failed");
-    assert!(ret.is_err());
     assert!(matches!(ret, Err(Error::CFILpadNotFound)));
 }
 
@@ -83,21 +81,23 @@ pub fn test_cfi_lpad_func_sig_zero() {
 #[test]
 pub fn test_cfi_lpad_func_sig_failed() {
     let ret = run("tests/programs/cfi_lpad_func_sig_failed");
-    assert!(ret.is_err());
     assert!(matches!(ret, Err(Error::CFILpadLabelMismatched)));
 }
 
 #[test]
 pub fn test_cfi_ss_only_pop() {
     let ret = run("tests/programs/cfi_ss_only_pop");
-    print!("err {:?}", ret);
-    assert!(ret.is_err());
     assert!(matches!(ret, Err(Error::CFIShadowStackOutOfStack)));
 }
 
 #[test]
 pub fn test_cfi_ss_popchk_failed() {
     let ret = run("tests/programs/cfi_ss_popchk_failed");
-    assert!(ret.is_err());
     assert!(matches!(ret, Err(Error::CFIShadowStackValueFault)));
 }
+
+#[test]
+pub fn test_cfi_lpad_align_failed() {
+    let ret = run("tests/programs/cfi_lpad_align_failed");
+    assert!(matches!(ret, Err(Error::CFILpadNot4ByteAligned)));
+}