[PATCH] D39717: Always use prctl(PR_SET_PTRACER)
Mike Hommey via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Tue Nov 7 01:00:28 PST 2017
glandium created this revision.
Herald added a subscriber: kubamracek.
Sufficiently old Linux kernel headers don't provide the PR_SET_PTRACER, but we can still call prctl with it if the runtime kernel is newer. Even if it's not, prctl will only return EINVAL.
@@ -57,6 +57,13 @@
+// Sufficiently old kernel header don't provide this value, but we can still
+// call prctl with it if the runtime kernel is newer. Even if it's not, prctl
+// will only return EINVAL.
+#define PR_SET_PTRACER 0x59616d61
// This module works by spawning a Linux task which then attaches to every
// thread in the caller process with ptrace. This suspends the threads, and
// PTRACE_GETREGS can then be used to obtain their register state. The callback
@@ -433,9 +440,7 @@
// On some systems we have to explicitly declare that we want to be traced
// by the tracer thread.
internal_prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
// Allow the tracer thread to start.
// NOTE: errno is shared between this thread and the tracer thread.
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