[Bug 261781] vdso: Time calculation integer overflow

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 261781] VDSO time calculation integer overflow"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 08 Feb 2022 17:50:38 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261781

--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
I do not understand what are you saying.

If scale * delta overflows, which we detect by calculating
ffsl(scale) + fls(delta), we do more complicated calculation that moves
overflow to bt->sec, and clamp scale to 32bit.

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