Emulate -EINVAL for MADV_GUARD_{INSTALL,REMOVE}.

Fixes #3997

Author: emilio

src/kernel_supplement.h

@@ -281,6 +281,12 @@ struct rr_input_mask {
 #ifndef MADV_COLLAPSE
 #define MADV_COLLAPSE 25
 #endif
+#ifndef MADV_GUARD_INSTALL
+#define MADV_GUARD_INSTALL 102
+#endif
+#ifndef MADV_GUARD_REMOVE
+#define MADV_GUARD_REMOVE 103
+#endif
 
 #ifndef BUS_MCEERR_AR
 #define BUS_MCEERR_AR 4

src/record_syscall.cc

@@ -5245,6 +5245,10 @@ static Switchable rec_prepare_syscall_arch(RecordTask* t,
           t->set_regs(r);
           break;
         }
+        case MADV_GUARD_INSTALL:
+        case MADV_GUARD_REMOVE:
+          syscall_state.emulate_result(-EINVAL);
+          break;
         default:
           syscall_state.expect_errno = EINVAL;
           break;

src/test/madvise_misc.c

@@ -29,6 +29,8 @@ int main(void) {
   DO_MADVISE(MADV_POPULATE_READ);
   DO_MADVISE(MADV_POPULATE_WRITE);
   DO_MADVISE(MADV_COLLAPSE);
+  DO_MADVISE(MADV_GUARD_INSTALL);
+  DO_MADVISE(MADV_GUARD_REMOVE);
 
   atomic_puts("EXIT-SUCCESS");
 

src/test/util.h

@@ -497,6 +497,12 @@ struct open_how {
 #ifndef MADV_COLLAPSE
 #define MADV_COLLAPSE 25
 #endif
+#ifndef MADV_GUARD_INSTALL
+#define MADV_GUARD_INSTALL 102
+#endif
+#ifndef MADV_GUARD_REMOVE
+#define MADV_GUARD_REMOVE 103
+#endif
 
 #ifndef F_OFD_GETLK
 #define F_OFD_GETLK 36