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The linker's -z now flag sets the DF_BIND_NOW flag, which signals to the runtime loader that all relocation processing should be performed at process startup rather than on demand. In combination with lld's default of enabling relro this causes the GOT to be made read-only when the process starts, preventing straightforward GOT overwrite attacks. Shawn Webb discovered a failure on HardenedBSD with BIND_NOW and ifunc use, which resulted in my rtld fix in r340137. Add a BIND_NOW knob as it is trivial to do so and is a useful ELF hardening feature. This change is equivalent to HardenedBSD's but not identical as there are other diffs/conflicts nearby. Note that our ELF Tool Chain readelf does not currently decode the DF_BIND_NOW flag - see PR232983. Reviewed by: brooks MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17846 |
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| .. | ||
| boot | ||
| bsdbox | ||
| build | ||
| bus_space | ||
| debugscripts | ||
| diag | ||
| ifnet | ||
| kerneldoc | ||
| KSE | ||
| LibraryReport | ||
| regression | ||
| sched | ||
| test | ||
| tools | ||
| install.sh | ||
| make_libdeps.sh | ||
| README | ||
| tinder.sh | ||
$FreeBSD$ This directory tree contains tools used for the maintenance and testing of FreeBSD. There is no toplevel Makefile structure since these tools are not meant to be built as part of the standard system, though there may be individual Makefiles in some of the subdirs. Please read the README files in the subdirs for further information.