| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tom Kincaid <tomjohnkincaid(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com> |
| Subject: | Re: storing an explicit nonce |
| Date: | 2021-05-26 02:41:56 |
| Message-ID: | 20210526024156.GU3048@momjian.us |
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| Lists: | pgsql-hackers |
On Tue, May 25, 2021 at 09:31:02PM -0400, Bruce Momjian wrote:
> I don't understand your computation above. You decrypt the page into
> shared buffers, you change a hint bit, and rewrite the page. You are
> re-XOR'ing the buffer copy with the same key and nonce. Doesn't that
> only change the hint bits in the new write?
Can someone explain the hint bit exploit using the process I describe
here?
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
If only the physical world exists, free will is an illusion.
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