Hi,
  A typo which makes it worse, for sure. The correct value is 438 but I
have described 448 which does something very different. I'll update it to
438 and the associated description.

Securing Debian says it is this
  The default value shown above allows all of the SysRq functions except
for the possibility of sending signals to processes.

This isn't correct either as it also stops dumps of processes too.

 - Craig

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Craig Small             https://dropbear.xyz/     csmall at : dropbear.xyz
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