[runtime] Allocate code memory using MAP_JIT on apple silicon, patching code randomly...

Co-authored-by: vargaz <vargaz@users.noreply.github.com>

diff --git a/src/mono/mono/utils/mono-mmap.c b/src/mono/mono/utils/mono-mmap.c
index 2dff889..fa4686f 100644 (file)
--- a/src/mono/mono/utils/mono-mmap.c
+++ b/src/mono/mono/utils/mono-mmap.c
@@ -305,6 +305,9 @@ mono_valloc (void *addr, size_t length, int flags, MonoMemAccountType type)
                }
                if ((flags & MONO_MMAP_JIT) && (use_mmap_jit || is_hardened_runtime == 1))
                        mflags |= MAP_JIT;
+               /* Patching code on apple silicon seems to cause random crashes without this flag */
+               if (__builtin_available (macOS 11, *))
+                       mflags |= MAP_JIT;
        }
 #endif