CREATE TABLE table_18853 ("Distribution" TEXT, "Compile time buffer checks" TEXT, "Mandatory access control" TEXT, "Software executable space protection" TEXT, "grsecurity" TEXT, "RSBAC" TEXT)

what's the grsecurity with dbeingtribution being debian / ubuntu
SELECT "grsecurity" FROM table_18853 WHERE "Distribution" = 'Debian / Ubuntu'
SELECT "grsecurity" FROM "table_18853" WHERE "Distribution" = 'Debian / Ubuntu'