libtimeinstate: open programs read-only

We only grant system_server read access to programs, but bpf_obj_get()
unnecessarily requests write as well. Instead, use bpfFdGet to open
the programs read-only

Test: programs are successfully opened & attached
Bug: 138317993
Change-Id: Icf6478737de7ea1272b995fdc7a5bd4e8947c10d
Signed-off-by: Connor O'Brien <connoro@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libs/cputimeinstate/cputimeinstate.cpp b/libs/cputimeinstate/cputimeinstate.cpp
index 05a462e026..a03775bdbf 100644
--- a/libs/cputimeinstate/cputimeinstate.cpp
+++ b/libs/cputimeinstate/cputimeinstate.cpp
@@ -156,7 +156,7 @@ static bool initGlobals() {
 static bool attachTracepointProgram(const std::string &eventType, const std::string &eventName) {
     std::string path = StringPrintf(BPF_FS_PATH "prog_time_in_state_tracepoint_%s_%s",
                                     eventType.c_str(), eventName.c_str());
-    int prog_fd = bpf_obj_get(path.c_str());
+    int prog_fd = bpfFdGet(path.c_str(), BPF_F_RDONLY);
     if (prog_fd < 0) return false;
     return bpf_attach_tracepoint(prog_fd, eventType.c_str(), eventName.c_str()) >= 0;
 }