Non-SFI mode: Add syscalls which are needed for nacl_helper_nonsfi's sandbox.

src/nonsfi/linux/abi_conversion.h

 /*
  * Copyright 2014 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef NATIVE_CLIENT_SRC_NONSFI_LINUX_ABI_CONVERSION_H_
 #define NATIVE_CLIENT_SRC_NONSFI_LINUX_ABI_CONVERSION_H_ 1
 
+#include <fcntl.h>
 #include <stdint.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <time.h>
+#include <stdio.h>

[Mark Seaborn, 2014/11/27 16:12:16]

Left over from debugging?

[hidehiko, 2014/11/28 16:58:15]

Good catch. Removed.

 
 #include "native_client/src/nonsfi/linux/linux_syscall_defines.h"
 #include "native_client/src/trusted/service_runtime/nacl_config.h"
 
 #if defined(__i386__) || defined(__arm__)
 
 struct linux_abi_timeval {
   int32_t tv_sec;
   int32_t tv_usec;
 };
@@ skipping 38 matching lines @@
    * We control the layout of this struct explicitly because PNaCl
    * clang inserts extra paddings even for the i386 target without
    * this.
    */
 } __attribute__((packed));
 
 #else
 # error Unsupported architecture
 #endif
 
+/* We do not use O_RDONLY for abi conversion because it is 0. */
+#define LINUX_O_WRONLY 01

[Mark Seaborn, 2014/11/27 16:12:17]

Which of these flags are different from NaCl/newlib so that conversion is
required?

[hidehiko, 2014/11/28 16:58:15]

O_SYNC and O_DIRECTORY.

O_SYNC is 010000 in NaCl ABI, but 04010000 in linux.
O_DIRECTORY depends on arch. On x86, it is 0200000, but on arm it is 040000.

+#define LINUX_O_RDWR 02
+#define LINUX_O_CREAT 0100
+#define LINUX_O_TRUNC 01000
+#define LINUX_O_APPEND 02000
+#define LINUX_O_EXCL 0200
+#define LINUX_O_NONBLOCK 04000
+#define LINUX_O_SYNC 04010000
+#define LINUX_O_ASYNC 020000
+
+#if defined(__i386__)
+# define LINUX_O_DIRECTORY 0200000
+#elif defined(__arm__)
+# define LINUX_O_DIRECTORY 040000
+#else
+# error Unsupported architecture
+#endif
+
+#define LINUX_O_CLOEXEC 02000000
+
+#define NACL_KNOWN_O_FLAGS (O_ACCMODE | O_CREAT | O_TRUNC | O_APPEND |\
+                            O_EXCL | O_NONBLOCK | O_SYNC | O_ASYNC |\
+                            O_DIRECTORY | O_CLOEXEC)
+
+/* Converts open flags from NaCl's to Linux's ABI. */
+static inline int nacl_oflags_to_linux_oflags(int nacl_oflags) {
+  if (nacl_oflags & ~NACL_KNOWN_O_FLAGS) {
+    /* Unknown bit is found. */
+    return -1;
+  }
+#define NACL_TO_LINUX(name) ((nacl_oflags & name) ? LINUX_ ## name : 0)
+  return (NACL_TO_LINUX(O_WRONLY) |
+          NACL_TO_LINUX(O_RDWR) |
+          NACL_TO_LINUX(O_CREAT) |
+          NACL_TO_LINUX(O_TRUNC) |
+          NACL_TO_LINUX(O_APPEND) |
+          NACL_TO_LINUX(O_EXCL) |
+          NACL_TO_LINUX(O_NONBLOCK) |
+          NACL_TO_LINUX(O_SYNC) |
+          NACL_TO_LINUX(O_ASYNC) |
+          NACL_TO_LINUX(O_DIRECTORY) |
+          NACL_TO_LINUX(O_CLOEXEC));
+#undef NACL_TO_LINUX
+}
+
+/* Converts open flags from Linux's to NaCl's ABI. */
+static inline int linux_oflags_to_nacl_oflags(int linux_oflags) {
+  /*
+   * Because O_SYNC has two 1-bits. So we cannot use the same validation
+   * check. We ignore unknown flags in this case.
+   */
+#define LINUX_TO_NACL(name) \
+  (((linux_oflags & LINUX_ ## name) == LINUX_ ## name) ? name : 0)
+  return (LINUX_TO_NACL(O_WRONLY) |
+          LINUX_TO_NACL(O_RDWR) |
+          LINUX_TO_NACL(O_CREAT) |
+          LINUX_TO_NACL(O_TRUNC) |
+          LINUX_TO_NACL(O_APPEND) |
+          LINUX_TO_NACL(O_EXCL) |
+          LINUX_TO_NACL(O_NONBLOCK) |
+          LINUX_TO_NACL(O_SYNC) |
+          LINUX_TO_NACL(O_ASYNC) |
+          LINUX_TO_NACL(O_DIRECTORY) |
+          LINUX_TO_NACL(O_CLOEXEC));
+#undef LINUX_TO_NACL
+}
+
 /* Converts the timespec struct from NaCl's to Linux's ABI. */
 static inline void nacl_timespec_to_linux_timespec(
     const struct timespec *nacl_timespec,
     struct linux_abi_timespec *linux_timespec) {
   linux_timespec->tv_sec = nacl_timespec->tv_sec;
   linux_timespec->tv_nsec = nacl_timespec->tv_nsec;
 }
 
 /* Converts the timespec struct from Linux's to NaCl's ABI. */
 static inline void linux_timespec_to_nacl_timespec(
@@ skipping 31 matching lines @@
   nacl_stat->st_rdev = 0;
   nacl_stat->st_size = linux_stat->st_size;
   nacl_stat->st_blksize = 0;
   nacl_stat->st_blocks = 0;
   nacl_stat->st_atime = linux_stat->st_atime;
   nacl_stat->st_mtime = linux_stat->st_mtime;
   nacl_stat->st_ctime = linux_stat->st_ctime;
 }
 
 #endif