https://github.com/devnexen created
https://github.com/llvm/llvm-project/pull/79662
before having the generic EINVAL message, we check if the
`security.bsd.unprivileged_proc_debug` allows process debugging.
close #79634
>From 492521e66288a497bf5b4a4a8ce554dffeb35727 Mon Sep 17 00:00:00 2001
From: David Carlier <devne...@gmail.com>
Date: Fri, 26 Jan 2024 22:47:15 +0000
Subject: [PATCH] [lldb] checks beforehand if lldb can trace/attach a process
on FreeBSD.
before having the generic EINVAL message, we check if the
`security.bsd.unprivileged_proc_debug` allows process debugging.
close #79634
---
.../Process/FreeBSD/NativeProcessFreeBSD.cpp | 29 ++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/lldb/source/Plugins/Process/FreeBSD/NativeProcessFreeBSD.cpp
b/lldb/source/Plugins/Process/FreeBSD/NativeProcessFreeBSD.cpp
index 19e0986ace31ff..7540ba29651782 100644
--- a/lldb/source/Plugins/Process/FreeBSD/NativeProcessFreeBSD.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD/NativeProcessFreeBSD.cpp
@@ -48,14 +48,37 @@ static Status EnsureFDFlags(int fd, int flags) {
return error;
}
+static Status CanTrace() {
+ Status status;
+ int proc_debug, ret;
+ size_t len = sizeof(proc_debug);
+ ret = ::sysctlbyname("security.bsd.unprivileged_proc_debug", &proc_debug,
&len, nullptr, 0);
+ if (ret != 0) {
+ return Status("sysctlbyname() security.bsd.unprivileged_proc_debug
failed");
+ }
+
+ if (proc_debug < 1) {
+ return Status("process debug disabled by
security.bsd.unprivileged_proc_debug oid");
+ }
+
+ return status;
+}
+
// Public Static Methods
llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
NativeProcessFreeBSD::Manager::Launch(ProcessLaunchInfo &launch_info,
NativeDelegate &native_delegate) {
Log *log = GetLog(POSIXLog::Process);
-
Status status;
+
+ status = CanTrace();
+
+ if (status.Fail()) {
+ LLDB_LOG(log, "failed to launch process: {0}", status);
+ return status.ToError();
+ }
+
::pid_t pid = ProcessLauncherPosixFork()
.LaunchProcess(launch_info, status)
.GetProcessId();
@@ -388,6 +411,10 @@ Status NativeProcessFreeBSD::PtraceWrapper(int req,
lldb::pid_t pid, void *addr,
Status error;
int ret;
+ error = CanTrace();
+ if (error.Fail())
+ return error;
+
errno = 0;
ret =
ptrace(req, static_cast<::pid_t>(pid), static_cast<caddr_t>(addr), data);
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