On Wed, Oct 13, 2021 at 12:48:51AM +0300, Ants Aasma wrote: > On Wed, 13 Oct 2021 at 00:25, Bruce Momjian <br...@momjian.us> wrote: > > On Tue, Oct 12, 2021 at 11:21:28PM +0300, Ants Aasma wrote: > > Page encrypting to all zeros is for all practical purposes impossible to > hit. > > Basically an attacker would have to be able to arbitrarily set the whole > > contents of the page and they would then achieve that this page gets > ignored. > > Uh, how do we know that valid data can't produce an encrypted all-zero > page? > > > Because the chances of that happening by accident are equivalent to making a > series of commits to postgres and ending up with the same git commit hash 400 > times in a row.
Yes, 256^8192 is 1e+19728, but why not just assume a page LSN=0 is an empty page, and if not, an error? Seems easier than checking if each page contains all zeros every time. -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com If only the physical world exists, free will is an illusion.
