On 3/22/14, Shawn Webb <latt...@gmail.com> wrote: > Hey All, > > First off, I hope that even as a non-committer, it's okay that I post > a call for testing. If not, please excuse my newbishness in this > process. This is my first time submitting a major patch upstream to > FreeBSD. > > Over the past few months, I've had the opportunity and pleasure to > enhance existing patches to FreeBSD that implement a common exploit > mitigation technology called Address Space Layout Randomization (ASLR) > along with support for Position Independent Executables (PIE). > ASLR+PIE has been a long-requested feature by many people I've met on > IRC. > > I've submitted my patch to PR kernel/181497. I'm currently in the > process of adding PIE support to certain high-visibility applications > in base (mainly network daemons). I've added a make.conf knob that's > default to enabled (WITH_PIE=1). An application has to also explicitly > support PIE as well by defining CAN_PIE in the Makefile prior to > including bsd.prog.mk. After I get a decent amount of applications > enabled with PIE support, I'll submit one last patch. > > The following sysctl's can be set with a kernel compiled with the > PAX_ASLR option: > > security.pax.aslr.status: 1 > security.pax.aslr.debug: 0 > security.pax.aslr.mmap_len: 16 > security.pax.aslr.stack_len: 12 > security.pax.aslr.exec_len: 12 > > The security.pax.aslr.status sysctl enables and disables the ASLR > system as a whole. The debug sysctl gives debugging output. The > mmap_len sysctl tells the ASLR system how many bits to randomize with > mmap() is called. The stack_len sysctl tells the ASLR system how many > bits to randomize in the stack. The exec_len sysctl tells the ASLR > system how many bits to randomize the execbase (this controls PIE). > These sysctls can be set as a per-jail basis. If you have an > application which doesn't support ASLR, yet you want ASLR enabled for > everything else, you can simply place that misbehaving application in > a jail with only that jail's ASLR settings turned off. > > Please let me know how your testing goes. I'm giving a presentation at > BSDCan regarding this. > > If you want to keep tabs on my bleeding-edge development process, > please follow my progress on GitHub: > https://github.com/lattera/freebsd (branch: soldierx/lattera/aslr). > > Thank you very much,
Hi! Please apply this patch. This fixed an issue with tunables. > > Shawn Webb > _______________________________________________ > firstname.lastname@example.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org" >
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