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MFC r354228: avoid kernel stack data leak in core dump thrmisc note

Description

MFC r354228: avoid kernel stack data leak in core dump thrmisc note

bzero the entire thrmisc struct, not just the padding. Other core dump
notes are already done this way.

Sponsored by: The FreeBSD Foundation

Details

Provenance
emasteAuthored on
Parents
rS354733: Disable ntpd stack gap. When ASLR with STACK GAP != 0 ntpd suffers SIGSEGV.
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