Revert "Pass the correct user ID to SetProcessProfilesCached()"

This reverts commit 27db51c4a5bfc9571ad77a3d5a2a5d2fab664c12.

Reason for revert: New patch available which replaces this change.

Bug: 313578691
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e1c4dbc802b103b1a8585cdea74de41eb33cb3ac)
Merged-In: Iff5a50df0dc36428b8509f9f972137f69b932766
Change-Id: Iff5a50df0dc36428b8509f9f972137f69b932766

1 files changed, 1 insertions, 32 deletions

diff --git a/core/jni/android_util_Process.cpp b/core/jni/android_util_Process.cpp
index 04b26b36fe63..91dfc6023e42 100644
--- a/core/jni/android_util_Process.cpp
+++ b/core/jni/android_util_Process.cpp
@@ -28,7 +28,6 @@
 #include <meminfo/sysmeminfo.h>
 #include <processgroup/processgroup.h>
 #include <processgroup/sched_policy.h>
-#include <android-base/logging.h>
 #include <android-base/unique_fd.h>
 
 #include <algorithm>
@@ -233,31 +232,6 @@ void android_os_Process_setThreadGroupAndCpuset(JNIEnv* env, jobject clazz, int
     }
 }
 
-// Look up the user ID of a process in /proc/${pid}/status. The Uid: line is present in
-// /proc/${pid}/status since at least kernel v2.5.
-static int uid_from_pid(int pid)
-{
-    int uid = -1;
-    std::array<char, 64> path;
-    int res = snprintf(path.data(), path.size(), "/proc/%d/status", pid);
-    if (res < 0 || res >= static_cast<int>(path.size())) {
-        DCHECK(false);
-        return uid;
-    }
-    FILE* f = fopen(path.data(), "r");
-    if (!f) {
-        return uid;
-    }
-    char line[256];
-    while (fgets(line, sizeof(line), f)) {
-        if (sscanf(line, "Uid: %d", &uid) == 1) {
-            break;
-        }
-    }
-    fclose(f);
-    return uid;
-}
-
 void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
 {
     ALOGV("%s pid=%d grp=%" PRId32, __func__, pid, grp);
@@ -301,12 +275,7 @@ void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jin
         }
     }
 
-    const int uid = uid_from_pid(pid);
-    if (uid < 0) {
-        signalExceptionForGroupError(env, ESRCH, pid);
-        return;
-    }
-    if (!SetProcessProfilesCached(uid, pid, {get_cpuset_policy_profile_name((SchedPolicy)grp)}))
+    if (!SetProcessProfilesCached(0, pid, {get_cpuset_policy_profile_name((SchedPolicy)grp)}))
         signalExceptionForGroupError(env, errno ? errno : EPERM, pid);
 }