cdd894e5de
- nptl: initialize cpu_id_start prior to rseq registration
- nptl: initialize rseq area prior to registration
35 lines
1.4 KiB
Diff
35 lines
1.4 KiB
Diff
From 37ded328c4240f5a84c69b8cb803f0652fa68d20 Mon Sep 17 00:00:00 2001
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From: Michael Jeanson <mjeanson@efficios.com>
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Date: Wed, 20 Nov 2024 14:15:42 -0500
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Subject: [PATCH] nptl: initialize cpu_id_start prior to rseq registration
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When adding explicit initialization of rseq fields prior to
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registration, I glossed over the fact that 'cpu_id_start' is also
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documented as initialized by user-space.
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While current kernels don't validate the content of this field on
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registration, future ones could.
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Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
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Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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(cherry picked from commit d9f40387d3305d97e30a8cf8724218c42a63680a)
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---
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sysdeps/unix/sysv/linux/rseq-internal.h | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/sysdeps/unix/sysv/linux/rseq-internal.h b/sysdeps/unix/sysv/linux/rseq-internal.h
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index 8fd26f335e..0ad79174bd 100644
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--- a/sysdeps/unix/sysv/linux/rseq-internal.h
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+++ b/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)
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registration, there is no guarantee that struct pthread is
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cleared on all architectures. */
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THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_UNINITIALIZED);
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+ THREAD_SETMEM (self, rseq_area.cpu_id_start, 0);
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THREAD_SETMEM (self, rseq_area.rseq_cs, 0);
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THREAD_SETMEM (self, rseq_area.flags, 0);
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--
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2.27.0
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