зеркало из https://github.com/mozilla/gecko-dev.git
28 строки
1.2 KiB
Diff
28 строки
1.2 KiB
Diff
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--- a/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
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+++ b/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
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@@ -57,6 +57,14 @@
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#include "sanitizer_mutex.h"
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#include "sanitizer_placement_new.h"
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+// Sufficiently old kernel headers don't provide this value, but we can still
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+// call prctl with it. If the runtime kernel is new enough, the prctl call will
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+// have the desired effect; if the kernel is too old, the call will error and we
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+// can ignore said error.
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+#ifndef PR_SET_PTRACER
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+#define PR_SET_PTRACER 0x59616d61
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+#endif
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+
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// This module works by spawning a Linux task which then attaches to every
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// thread in the caller process with ptrace. This suspends the threads, and
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// PTRACE_GETREGS can then be used to obtain their register state. The callback
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@@ -433,9 +441,7 @@
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ScopedSetTracerPID scoped_set_tracer_pid(tracer_pid);
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// On some systems we have to explicitly declare that we want to be traced
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// by the tracer thread.
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-#ifdef PR_SET_PTRACER
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internal_prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
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-#endif
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// Allow the tracer thread to start.
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tracer_thread_argument.mutex.Unlock();
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// NOTE: errno is shared between this thread and the tracer thread.
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