Enable SafeStack on NetBSD

[krytarowski]

Summary

make check-safestack:

• Testing: 8 tests, 8 threads --

Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
Testing Time: 0.44s

Expected Passes    : 7
Unsupported Tests  : 1

Sponsored by <The NetBSD Foundation>

cmake/config-ix.cmake

 if (COMPILER_RT_HAS_SANITIZER_COMMON AND UBSAN_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Darwin|Linux|FreeBSD|NetBSD|Windows|Android|Fuchsia")
   set(COMPILER_RT_HAS_UBSAN TRUE)
 else()
   set(COMPILER_RT_HAS_UBSAN FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND SAFESTACK_SUPPORTED_ARCH AND
-    OS_NAME MATCHES "Darwin|Linux|FreeBSD")
+    OS_NAME MATCHES "Darwin|Linux|FreeBSD|NetBSD")
   set(COMPILER_RT_HAS_SAFESTACK TRUE)
 else()
   set(COMPILER_RT_HAS_SAFESTACK FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND CFI_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Linux")
   set(COMPILER_RT_HAS_CFI TRUE)

lib/safestack/safestack.cc

 
 #include <limits.h>
 #include <pthread.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <unistd.h>
 #include <sys/resource.h>
 #include <sys/types.h>
+#if !defined(__NetBSD__)
 #include <sys/user.h>
+#endif
 
 #include "interception/interception.h"
 #include "sanitizer_common/sanitizer_common.h"
 
 // TODO: The runtime library does not currently protect the safe stack beyond
 // relying on the system-enforced ASLR. The protection of the (safe) stack can
 // be provided by three alternative features:
 //

test/safestack/lit.cfg

 
 # Add clang substitutions.
 config.substitutions.append( ("%clang_nosafestack ", config.clang + " -O0 -fno-sanitize=safe-stack ") )
 config.substitutions.append( ("%clang_safestack ", config.clang + " -O0 -fsanitize=safe-stack ") )
 
 if config.lto_supported:
   config.substitutions.append((r"%clang_lto_safestack ", ' '.join(config.lto_launch + [config.clang] + config.lto_flags + ['-fsanitize=safe-stack '])))
 
-# SafeStack tests are currently supported on Linux, FreeBSD and Darwin only.
-if config.host_os not in ['Linux', 'FreeBSD', 'Darwin']:
+if config.host_os not in ['Linux', 'FreeBSD', 'Darwin', 'NetBSD']:
    config.unsupported = True
 
 # Allow tests to use REQUIRES=stable-runtime.  For use when you cannot use XFAIL
 # because the test fail due some runtime issue.
 if config.target_arch != 'aarch64':
   config.available_features.add('stable-runtime')