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Differential D19251

Impose a limit on GEOM_CTL argument lists.
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Authored by markj on Feb 19 2019, 7:27 PM.
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rS344305: Impose a limit on the number of GEOM_CTL arguments.
Summary

A privileged user can otherwise play games by triggering a large memory
allocation or an overflow. Return an error if the user specified more
than 2048 arguments.

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Build Status
Buildable 22582
Build 21712: arc lint + arc unit

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sys/
geom/
6 lines

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sys/geom/geom_ctl.c

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