1 files changed, 45 insertions, 0 deletions
diff --git a/sandbox/linux/suid/process_util_linux.c b/sandbox/linux/suid/process_util_linux.c
new file mode 100644
index 0000000..4a574ad
--- /dev/null
+++ b/sandbox/linux/suid/process_util_linux.c
@@ -0,0 +1,45 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// The following is the C version of code from base/process_utils_linux.cc.
+// We shouldn't link against C++ code in a setuid binary.
+
+#include "process_util.h"
+
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+bool AdjustOOMScore(pid_t process, int score) {
+  if (score < 0 || score > 15)
+    return false;
+
+  char oom_adj[35];  // "/proc/" + log_2(2**64) + "/oom_adj\0"
+                     //    6     +       20     +     9         = 35
+  snprintf(oom_adj, sizeof(oom_adj), "/proc/%lu", process);
+
+  struct stat statbuf;
+  if (stat(oom_adj, &statbuf) < 0)
+    return false;
+  if (getuid() != statbuf.st_uid)
+    return false;
+
+  strcat(oom_adj, "/oom_adj");
+  int fd = open(oom_adj, O_WRONLY);
+  if (fd < 0)
+    return false;
+
+  char buf[3];  // 0 <= |score| <= 15;
+  snprintf(buf, sizeof(buf), "%d", score);
+  size_t len = strlen(buf);
+
+  ssize_t bytes_written = write(fd, buf, len);
+  close(fd);
+  return (bytes_written == len);
+}