Merged PR 585498: [LinuxSandbox] Report new process when libDetours.so is dynamically loaded

When a process is executed in a root jail, the root process under `chroot` is not being reported without this change.

Public/Src/Sandbox/Linux/detours.cpp

@@ -71,7 +71,7 @@ INTERPOSE(int, clone, int (*fn)(void *), void *child_stack, int flags, void *arg
 })
 
 INTERPOSE(int, fexecve, int fd, char *const argv[], char *const envp[])({
-    bxl->report_access_fd(__func__, ES_EVENT_TYPE_NOTIFY_EXEC, fd);    
+    bxl->report_access_fd(__func__, ES_EVENT_TYPE_NOTIFY_EXEC, fd);
     return bxl->fwd_fexecve(fd, argv, bxl->ensureEnvs(envp)).restore();
 })
 
@@ -588,9 +588,14 @@ static void report_exit(int exitCode, void *args)
     BxlObserver::GetInstance()->report_access("on_exit", ES_EVENT_TYPE_NOTIFY_EXIT, std::string(""), std::string(""));
 }
 
+// invoked by the loader when our shared library is dynamically loaded into a new host process
 void __attribute__ ((constructor)) _bxl_linux_sandbox_init(void)
 {
-   on_exit(report_exit, NULL);
+    // set up an on-exit handler
+    on_exit(report_exit, NULL);
+
+    // report that a new process has been created 
+    BxlObserver::GetInstance()->report_access("__init__", ES_EVENT_TYPE_NOTIFY_EXEC, __progname);
 }
 
 // ==========================

cg/nuget/cgmanifest.json

@@ -3741,7 +3741,7 @@
         "Type": "NuGet",
         "NuGet": {
           "Name": "runtime.linux-x64.BuildXL",
-          "Version": "0.0.41"
+          "Version": "0.0.42"
         }
       }
     },

config.dsc

@@ -377,7 +377,7 @@ config({
                 // Runtime dependencies for Linux
                 {
                     id: "runtime.linux-x64.BuildXL",
-                    version: "0.0.41",
+                    version: "0.0.42",
                     osSkip: importFile(f`config.microsoftInternal.dsc`).isMicrosoftInternal
                         ? []
                         : [ "win", "macOS", "unix" ]