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nptl: initialize cpu_id_start prior to rseq registration

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When adding explicit initialization of rseq fields prior to
registration, I glossed over the fact that 'cpu_id_start' is also
documented as initialized by user-space.

While current kernels don't validate the content of this field on
registration, future ones could.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
(cherry picked from commit d9f40387d3305d97e30a8cf8724218c42a63680a)
This commit is contained in:
Michael Jeanson 2024-11-20 14:15:42 -05:00
parent b1f62861bf
commit 314419978f
1 changed files with 1 additions and 0 deletions
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sysdeps/unix/sysv/linux/rseq-internal.h
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@ -56,6 +56,7 @@ rseq_register_current_thread (struct pthread *self, bool do_rseq)
registration, there is no guarantee that struct pthread is
cleared on all architectures. */
THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_UNINITIALIZED);
THREAD_SETMEM (self, rseq_area.cpu_id_start, 0);
THREAD_SETMEM (self, rseq_area.rseq_cs, 0);
THREAD_SETMEM (self, rseq_area.flags, 0);