| menu "Kernel hacking" | |
| source "lib/Kconfig.debug" | |
| config DEBUG_RODATA | |
| bool "Write protect kernel read-only data structures" | |
| depends on DEBUG_KERNEL | |
| help | |
| Mark the kernel read-only data as write-protected in the pagetables, | |
| in order to catch accidental (and incorrect) writes to such const | |
| data. This option may have a slight performance impact because a | |
| portion of the kernel code won't be covered by a TLB anymore. | |
| If in doubt, say "N". | |
| config DEBUG_STRICT_USER_COPY_CHECKS | |
| bool "Strict copy size checks" | |
| depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING | |
| ---help--- | |
| Enabling this option turns a certain set of sanity checks for user | |
| copy operations into compile time failures. | |
| The copy_from_user() etc checks are there to help test if there | |
| are sufficient security checks on the length argument of | |
| the copy operation, by having gcc prove that the argument is | |
| within bounds. | |
| If unsure, or if you run an older (pre 4.4) gcc, say N. | |
| endmenu |