Date: Mon, 31 Mar 2014 02:07:01 +0200 From: Oliver Pinter <oliver.pntr@gmail.com> To: Shawn Webb <lattera@gmail.com> Cc: FreeBSD-current <freebsd-current@freebsd.org> Subject: Re: [CFT] ASLR and PIE on amd64 Message-ID: <CAPjTQNFe7mrBCWNqWiJPPW7kkE9RyhEH-3XqvVkqDzb%2B-YrZkg@mail.gmail.com> In-Reply-To: <CADt0fhzxTF=CoRZSLXv3MpKJisZx1kCd48O3wqkSL-8vL3ogaA@mail.gmail.com> References: <CADt0fhzxTF=CoRZSLXv3MpKJisZx1kCd48O3wqkSL-8vL3ogaA@mail.gmail.com>
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--089e015380bab16b1604f5dbd4e0 Content-Type: text/plain; charset=ISO-8859-1 On 3/22/14, Shawn Webb <lattera@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 > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > --089e015380bab16b1604f5dbd4e0 Content-Type: application/octet-stream; name="0001-PaX-ASLR-fixed-tunables-in-kern_pax.c.patch" Content-Disposition: attachment; filename="0001-PaX-ASLR-fixed-tunables-in-kern_pax.c.patch" Content-Transfer-Encoding: base64 X-Attachment-Id: file0 RnJvbSAwODkwYmUxMGJlOWRjMTU4MDM3YzEzN2NmNDRlNDlkYWUzM2Q3NTNkIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBPbGl2ZXIgUGludGVyIDxvbGl2ZXIucG50ckBnbWFpbC5jb20+ CkRhdGU6IE1vbiwgMzEgTWFyIDIwMTQgMDI6MDI6NDIgKzAyMDAKU3ViamVjdDogW1BBVENIXSBQ YVggQVNMUjogZml4ZWQgdHVuYWJsZXMgaW4ga2Vybl9wYXguYwoKU2lnbmVkLW9mZi1ieTogT2xp dmVyIFBpbnRlciA8b2xpdmVyLnBudHJAZ21haWwuY29tPgotLS0KIHN5cy9rZXJuL2tlcm5fcGF4 LmMgfCA2ICsrKy0tLQogMSBmaWxlIGNoYW5nZWQsIDMgaW5zZXJ0aW9ucygrKSwgMyBkZWxldGlv bnMoLSkKCmRpZmYgLS1naXQgYS9zeXMva2Vybi9rZXJuX3BheC5jIGIvc3lzL2tlcm4va2Vybl9w YXguYwppbmRleCAyMTg1YmFmLi5iMDNjYzAzIDEwMDY0NAotLS0gYS9zeXMva2Vybi9rZXJuX3Bh eC5jCisrKyBiL3N5cy9rZXJuL2tlcm5fcGF4LmMKQEAgLTk5LDIxICs5OSwyMSBAQCBTWVNDVExf UFJPQyhfc2VjdXJpdHlfcGF4X2FzbHIsIE9JRF9BVVRPLCBtbWFwX2xlbiwKICAgICBOVUxMLCAw LCBzeXNjdGxfcGF4X2FzbHJfbW1hcCwgIkkiLAogICAgICJOdW1iZXIgb2YgYml0cyByYW5kb21p emVkIGZvciBtbWFwKDIpIGNhbGxzLiAiCiAgICAgIjMyIGJpdDogWzgsMTZdIDY0IGJpdDogWzE2 LDMyXSIpOwotVFVOQUJMRV9JTlQoInNlY3VyaXR5LnBheC5hc2xyLm1tYXAiLCAmcGF4X2FzbHJf bW1hcF9sZW4pOworVFVOQUJMRV9JTlQoInNlY3VyaXR5LnBheC5hc2xyLm1tYXBfbGVuIiwgJnBh eF9hc2xyX21tYXBfbGVuKTsKIAogU1lTQ1RMX1BST0MoX3NlY3VyaXR5X3BheF9hc2xyLCBPSURf QVVUTywgc3RhY2tfbGVuLAogICAgIENUTFRZUEVfSU5UfENUTEZMQUdfUld8Q1RMRkxBR19UVU58 Q1RMRkxBR19QUklTT04sCiAgICAgTlVMTCwgMCwgc3lzY3RsX3BheF9hc2xyX3N0YWNrLCAiSSIs CiAgICAgIk51bWJlciBvZiBiaXRzIHJhbmRvbWl6ZWQgZm9yIHRoZSBzdGFjay4gIgogICAgICIz MiBiaXQ6IFs2LDEyXSA2NCBiaXQ6IFsxMiwyMV0iKTsKLVRVTkFCTEVfSU5UKCJzZWN1cml0eS5w YXguYXNsci5zdGFjayIsICZwYXhfYXNscl9zdGFja19sZW4pOworVFVOQUJMRV9JTlQoInNlY3Vy aXR5LnBheC5hc2xyLnN0YWNrX2xlbiIsICZwYXhfYXNscl9zdGFja19sZW4pOwogCiBTWVNDVExf UFJPQyhfc2VjdXJpdHlfcGF4X2FzbHIsIE9JRF9BVVRPLCBleGVjX2xlbiwKICAgICBDVExUWVBF X0lOVHxDVExGTEFHX1JXfENUTEZMQUdfVFVOfENUTEZMQUdfUFJJU09OLAogICAgIE5VTEwsIDAs IHN5c2N0bF9wYXhfYXNscl9leGVjLCAiSSIsCiAgICAgIk51bWJlciBvZiBiaXRzIHJhbmRvbWl6 ZWQgZm9yIHRoZSBQSUUgZXhlYyBiYXNlLiAiCiAgICAgIjMyIGJpdDogWzYsMTJdIDY0IGJpdDog WzEyLDIxXSIpOwotVFVOQUJMRV9JTlQoInNlY3VyaXR5LnBheC5hc2xyLnN0YWNrIiwgJnBheF9h c2xyX2V4ZWNfbGVuKTsKK1RVTkFCTEVfSU5UKCJzZWN1cml0eS5wYXguYXNsci5leGVjX2xlbiIs ICZwYXhfYXNscl9leGVjX2xlbik7CiAKIHN0YXRpYyBpbnQKIHN5c2N0bF9wYXhfYXNscl9zdGF0 dXMoU1lTQ1RMX0hBTkRMRVJfQVJHUykKLS0gCjEuOS4wCgo= --089e015380bab16b1604f5dbd4e0--
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