aarch64: fix __builtin_eh_return with pac-ret [PR94891]

Currently __builtin_eh_return takes a signed return address, which can
cause ABI and API issues: 1) pointer representation problems if the
address is passed around before eh return, 2) the source code needs
pac-ret specific changes and needs to know if pac-ret is used in the
current frame, 3) signed address may not be representible as void *
(with ilp32 abi).

Using address signing to protect eh return is ineffective because the
instruction sequence in the unwinder that starts from the address
signing and ends with a ret can be used as a return to anywhere gadget.
Using indirect branch istead of ret with bti j landing pads at the
target can reduce the potential of such gadget, which also implies
that __builtin_eh_return should not take a signed address.

This is a big hammer fix to the ABI and API issues: it turns pac-ret
off for the caller completely (not just on the eh return path).  To
harden the caller against ROP attacks, it should use indirect branch
instead of ret, this is not attempted so the patch remains small and
backportable.

2020-07-13  Szabolcs Nagy  <szabolcs.nagy@arm.com>

gcc/ChangeLog:

	PR target/94891
	* config/aarch64/aarch64.c (aarch64_return_address_signing_enabled):
	Disable return address signing if __builtin_eh_return is used.

gcc/testsuite/ChangeLog:

	PR target/94891
	* gcc.target/aarch64/return_address_sign_1.c: Update test.
	* gcc.target/aarch64/return_address_sign_b_1.c: Likewise.

gcc/config/aarch64/aarch64.c

@@ -6957,6 +6957,17 @@ aarch64_return_address_signing_enabled (void)
   /* This function should only be called after frame laid out.   */
   gcc_assert (cfun->machine->frame.laid_out);
 
+  /* Turn return address signing off in any function that uses
+     __builtin_eh_return.  The address passed to __builtin_eh_return
+     is not signed so either it has to be signed (with original sp)
+     or the code path that uses it has to avoid authenticating it.
+     Currently eh return introduces a return to anywhere gadget, no
+     matter what we do here since it uses ret with user provided
+     address. An ideal fix for that is to use indirect branch which
+     can be protected with BTI j (to some extent).  */
+  if (crtl->calls_eh_return)
+    return false;
+
   /* If signing scope is AARCH64_FUNCTION_NON_LEAF, we only sign a leaf function
      if its LR is pushed onto stack.  */
   return (aarch64_ra_sign_scope == AARCH64_FUNCTION_ALL

gcc/testsuite/gcc.target/aarch64/return_address_sign_1.c

@@ -41,12 +41,12 @@ func3 (int a, int b, int c)
 void __attribute__ ((target ("arch=armv8.3-a")))
 func4 (long offset, void *handler, int *ptr, int imm1, int imm2)
 {
-  /* paciasp */
+  /* no paciasp */
   *ptr = imm1 + foo (imm1) + imm2;
   __builtin_eh_return (offset, handler);
-  /* autiasp */
+  /* no autiasp */
   return;
 }
 
-/* { dg-final { scan-assembler-times "autiasp" 4 } } */
-/* { dg-final { scan-assembler-times "paciasp" 4 } } */
+/* { dg-final { scan-assembler-times "autiasp" 3 } } */
+/* { dg-final { scan-assembler-times "paciasp" 3 } } */

gcc/testsuite/gcc.target/aarch64/return_address_sign_b_1.c

@@ -41,12 +41,12 @@ func3 (int a, int b, int c)
 void __attribute__ ((target ("arch=armv8.3-a")))
 func4 (long offset, void *handler, int *ptr, int imm1, int imm2)
 {
-  /* pacibsp */
+  /* no pacibsp */
   *ptr = imm1 + foo (imm1) + imm2;
   __builtin_eh_return (offset, handler);
-  /* autibsp */
+  /* no autibsp */
   return;
 }
 
-/* { dg-final { scan-assembler-times "pacibsp" 4 } } */
-/* { dg-final { scan-assembler-times "autibsp" 4 } } */
+/* { dg-final { scan-assembler-times "pacibsp" 3 } } */
+/* { dg-final { scan-assembler-times "autibsp" 3 } } */