https://bugs.kde.org/show_bug.cgi?id=396887
Mark Wielaard <m...@klomp.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from Mark Wielaard <m...@klomp.org> ---
commit 21a01b13e259b9a43f10f0046b2b3f409c11ea75
Author: Mark Wielaard <m...@klomp.org>
Date: Mon Jul 30 12:20:16 2018 +0200
Bug 396887 - arch_prctl should return EINVAL on unknown option.
Currently arch_prctl calls VG_(core_panic) when it sees an unknown
arch_prctl option which kills the process. glibc uses arch_prctl with
an (as yet) unknown option to see if the kernel supports CET. This
breaks any application running under valgrind on x86_64 with:
valgrind: the 'impossible' happened:
Unsupported arch_prctl option
Thread 1: status = VgTs_Runnable (lwpid 19934)
==19934== at 0x121A15: get_cet_status (cpu-features.c:28)
==19934== by 0x121A15: init_cpu_features (cpu-features.c:474)
==19934== by 0x121A15: dl_platform_init (dl-machine.h:228)
==19934== by 0x121A15: _dl_sysdep_start (dl-sysdep.c:231)
==19934== by 0x10A1D7: _dl_start_final (rtld.c:413)
==19934== by 0x10A1D7: _dl_start (rtld.c:520)
We already handle all known options. It would be better to do as the
kernel does and just return failure with EINVAL instead.
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