copy_from_user() functions) by rejecting memory ranges that
are larger than the specified heap object, span multiple
separately allocated pages, are not on the process stack,
- or are part of the kernel text. This kills entire classes
+ or are part of the kernel text. This prevents entire classes
of heap overflow exploits and similar kernel memory exposures.
-config HARDENED_USERCOPY_PAGESPAN
- bool "Refuse to copy allocations that span multiple pages"
- depends on HARDENED_USERCOPY
- depends on BROKEN
- help
- When a multi-page allocation is done without __GFP_COMP,
- hardened usercopy will reject attempts to copy it. There are,
- however, several cases of this in the kernel that have not all
- been removed. This config is intended to be used only while
- trying to find such users.
-
config FORTIFY_SOURCE
bool "Harden common str/mem functions against buffer overflows"
depends on ARCH_HAS_FORTIFY_SOURCE