kern/181497: [kernel] [patch] Add ASLR feature to kernel
Oliver Pinter
oliver.pntr at gmail.com
Mon Feb 3 01:01:43 UTC 2014
Minor correction, Elad Efrat has ported PaX's ASLR to NetBSD. The main
difference is NetBSD's implementation have segvguard and pic.
On 2/3/14, Shawn Webb <lattera at gmail.com> wrote:
> The following reply was made to PR kern/181497; it has been noted by GNATS.
>
> From: Shawn Webb <lattera at gmail.com>
> To: bug-followup at FreeBSD.org,
> steven at roothosts.com
> Cc:
> Subject: Re: kern/181497: [kernel] [patch] Add ASLR feature to kernel
> Date: Sun, 2 Feb 2014 19:34:40 -0500
>
> --Apple-Mail=_B6453ACB-0EC9-4C80-B575-87E00F273BCF
> Content-Transfer-Encoding: quoted-printable
> Content-Type: text/plain;
> charset=us-ascii
>
> Over the past few months, I've had the pleasure of enhancing Oliver's =
> original patch. I've added support for randomizing the address of the =
> RTLD and changing the behavior of ASLR to be set on a per-jail basis. =
> This means that if a user requires an application that doesn't support =
> ASLR (crashes, exhibits bugs, etc.), then the affected application can =
> simply be placed in a jail with ASLR turned off. The rest of the system =
> and the rest of the jails would still have ASLR turned on.
>
> Oliver had ported over PaX's ASLR to NetBSD a few years back, and these =
> patches brings FreeBSD feature-for-feature complete with NetBSD's ASLR =
> implementation. What's lacking, along with NetBSD's implementation, is =
> exec base randomization. This needs to be done on a per-binary basis, =
> for binaries compiled with -fPIE. Additionally, we might want to =
> specifically mark executables with an ELF note, specifying that it's =
> safe to relocate the exec base.
>
> One known bug is that applications compiled with clang with -fPIC -fPIE =
> -static combined could segfault. I can provide a sample binary (with =
> sample code) if needed for a simple five-line test application.
>
> I will continue to research exec base randomization, but this task might =
> be a bit over my head skill-wise.
>
> Attached is the patch against 11-current as of 02 Feb 2014. If I make =
> more progress on exec base randomization, you can follow my GitHub repo =
> at https://github.com/lattera/freebsd, branch soldierx/lattera/aslr.
>
> Thanks,
>
> Shawn Webb
>
>
> --Apple-Mail=_B6453ACB-0EC9-4C80-B575-87E00F273BCF
> Content-Disposition: attachment;
> filename=fbsd_aslr_11-current-2014-02-02.patch.txt
> Content-Type: text/plain;
> name="fbsd_aslr_11-current-2014-02-02.patch.txt"
> Content-Transfer-Encoding: quoted-printable
>
> diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
> index f6da68e..3f9487c 100644
> --- a/sys/kern/imgact_elf.c
> +++ b/sys/kern/imgact_elf.c
> @@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
> #include "opt_capsicum.h"
> #include "opt_compat.h"
> #include "opt_core.h"
> +#include "opt_pax.h"
> =20
> #include <sys/param.h>
> #include <sys/capability.h>
> @@ -47,7 +48,9 @@ __FBSDID("$FreeBSD$");
> #include <sys/mount.h>
> #include <sys/mman.h>
> #include <sys/namei.h>
> +#include <sys/pax.h>
> #include <sys/pioctl.h>
> +#include <sys/jail.h>
> #include <sys/proc.h>
> #include <sys/procfs.h>
> #include <sys/racct.h>
> @@ -600,6 +603,7 @@ __elfN(load_file)(struct proc *p, const char *file, =
> u_long *addr,
> u_long rbase;
> u_long base_addr =3D 0;
> int error, i, numsegs;
> + struct prison *pr; /* For ASLR */
> =20
> #ifdef CAPABILITY_MODE
> /*
> @@ -664,6 +668,13 @@ __elfN(load_file)(struct proc *p, const char *file, =
> u_long *addr,
> goto fail;
> }
> =20
> +#ifdef PAX_ASLR
> + pr =3D pax_aslr_get_prison(NULL, imgp->proc);
> + if (pax_aslr_active(NULL, imgp->proc)) {
> + rbase +=3D round_page(PAX_ASLR_DELTA(arc4random(), =
> PAX_ASLR_DELTA_EXEC_LSB, pr->pr_pax_aslr_exec_len));
> + }
> +#endif
> +
> /* Only support headers that fit within first page for now =
> */
> if ((hdr->e_phoff > PAGE_SIZE) ||
> (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - =
> hdr->e_phoff) {
> diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
> index 9f4ceac..099ff0a 100644
> --- a/sys/kern/kern_exec.c
> +++ b/sys/kern/kern_exec.c
> @@ -30,6 +30,7 @@ __FBSDID("$FreeBSD$");
> #include "opt_capsicum.h"
> #include "opt_hwpmc_hooks.h"
> #include "opt_ktrace.h"
> +#include "opt_pax.h"
> #include "opt_vm.h"
> =20
> #include <sys/param.h>
> @@ -94,6 +95,10 @@ __FBSDID("$FreeBSD$");
> dtrace_execexit_func_t dtrace_fasttrap_exec;
> #endif
> =20
> +#ifdef PAX_ASLR
> +#include <sys/pax.h>
> +#endif /* PAX_ASLR */
> +
> SDT_PROVIDER_DECLARE(proc);
> SDT_PROBE_DEFINE1(proc, kernel, , exec, "char *");
> SDT_PROBE_DEFINE1(proc, kernel, , exec__failure, "int");
> @@ -1055,6 +1060,10 @@ exec_new_vmspace(imgp, sv)
> map =3D &vmspace->vm_map;
> }
> =20
> +#ifdef PAX_ASLR
> + pax_aslr_init(curthread, imgp);
> +#endif /* PAX_ASLR */
> +
> /* Map a shared page */
> obj =3D sv->sv_shared_page_obj;
> if (obj !=3D NULL) {
> @@ -1232,12 +1241,16 @@ exec_copyout_strings(imgp)
> int argc, envc;
> char **vectp;
> char *stringp, *destp;
> +#ifdef PAX_ASLR
> + char *orig_destp;
> +#endif /* PAX_ASLR */
> register_t *stack_base;
> struct ps_strings *arginfo;
> struct proc *p;
> size_t execpath_len;
> int szsigcode, szps;
> char canary[sizeof(long) * 8];
> + unsigned int sgap;
> =20
> szps =3D sizeof(pagesizes[0]) * MAXPAGESIZES;
> /*
> @@ -1255,11 +1268,16 @@ exec_copyout_strings(imgp)
> if (p->p_sysent->sv_szsigcode !=3D NULL)
> szsigcode =3D *(p->p_sysent->sv_szsigcode);
> }
> - destp =3D (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
> + sgap=3D(unsigned int)(ALIGN(arc4random()&((64*1024)-1)));
> + destp =3D (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - =
> sgap -
> roundup(execpath_len, sizeof(char *)) -
> roundup(sizeof(canary), sizeof(char *)) -
> roundup(szps, sizeof(char *)) -
> roundup((ARG_MAX - imgp->args->stringspace), sizeof(char =
> *));
> +#ifdef PAX_ASLR
> + orig_destp =3D destp;
> + pax_aslr_stack(curthread, &destp, orig_destp);
> +#endif /* PAX_ASLR */
> =20
> /*
> * install sigcode
> diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
> index 700b7d6..af97118 100644
> --- a/sys/kern/kern_jail.c
> +++ b/sys/kern/kern_jail.c
> @@ -33,6 +33,7 @@ __FBSDID("$FreeBSD$");
> #include "opt_ddb.h"
> #include "opt_inet.h"
> #include "opt_inet6.h"
> +#include "opt_pax.h"
> =20
> #include <sys/param.h>
> #include <sys/types.h>
> @@ -60,6 +61,7 @@ __FBSDID("$FreeBSD$");
> #include <sys/syscallsubr.h>
> #include <sys/sysctl.h>
> #include <sys/vnode.h>
> +#include <sys/pax.h>
> =20
> #include <net/if.h>
> #include <net/if_var.h>
> @@ -114,6 +116,20 @@ struct prison prison0 =3D {
> .pr_flags =3D PR_HOST|_PR_IP_SADDRSEL,
> #endif
> .pr_allow =3D PR_ALLOW_ALL,
> +#ifdef PAX_ASLR
> + .pr_pax_set =3D 0,
> + .pr_pax_aslr_status =3D 0,
> + .pr_pax_aslr_debug =3D 0,
> + .pr_pax_aslr_mmap_len =3D PAX_ASLR_DELTA_MMAP_MIN_LEN,
> + .pr_pax_aslr_stack_len =3D PAX_ASLR_DELTA_STACK_MIN_LEN,
> + .pr_pax_aslr_exec_len =3D PAX_ASLR_DELTA_EXEC_MIN_LEN,
> +#ifdef COMPAT_FREEBSD32
> + .pr_pax_aslr_compat_status =3D 0,
> + .pr_pax_aslr_compat_mmap_len =3D =
> PAX_ASLR_COMPAT_DELTA_MMAP_MIN_LEN,
> + .pr_pax_aslr_compat_stack_len =3D =
> PAX_ASLR_COMPAT_DELTA_STACK_MIN_LEN,
> + .pr_pax_aslr_compat_exec_len =3D =
> PAX_ASLR_COMPAT_DELTA_EXEC_MIN_LEN,
> +#endif /* COMPAT_FREEBSD32 */
> +#endif /* PAX_ASLR */
> };
> MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
> =20
> diff --git a/sys/kern/kern_pax.c b/sys/kern/kern_pax.c
> new file mode 100644
> index 0000000..9182606
> --- /dev/null
> +++ b/sys/kern/kern_pax.c
> @@ -0,0 +1,589 @@
> +/*-
> + * Copyright (c) 2013, by Oliver Pinter <oliver.pntr at gmail.com>
> + * All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. The name of the developer may NOT be used to endorse or promote =
> products
> + * derived from this software without specific prior written =
> permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' =
> AND
> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, =
> THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR =
> PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE =
> LIABLE
> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR =
> CONSEQUENTIAL
> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE =
> GOODS
> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS =
> INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, =
> STRICT
> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN =
> ANY WAY
> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY =
> OF
> + * SUCH DAMAGE.
> + *
> + * $FreeBSD$
> + *
> + * Enhancements made by Shawn "lattera" Webb under the direction of =
> SoldierX.
> + */
> +
> +#include <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +#include "opt_pax.h"
> +#include "opt_compat.h"
> +
> +#include <sys/param.h>
> +#include <sys/systm.h>
> +#include <sys/kernel.h>
> +#include <sys/imgact.h>
> +#include <sys/sysent.h>
> +#include <sys/proc.h>
> +#include <sys/elf_common.h>
> +#include <sys/pax.h>
> +#include <sys/sysctl.h>
> +#include <sys/vnode.h>
> +#include <sys/queue.h>
> +#include <sys/libkern.h>
> +#include <sys/jail.h>
> +
> +#include <sys/mman.h>
> +#include <sys/libkern.h>
> +#include <sys/exec.h>
> +
> +#include <vm/pmap.h>
> +#include <vm/vm_map.h>
> +
> +static int sysctl_pax_aslr_status(SYSCTL_HANDLER_ARGS);
> +static int sysctl_pax_aslr_mmap(SYSCTL_HANDLER_ARGS);
> +static int sysctl_pax_aslr_stack(SYSCTL_HANDLER_ARGS);
> +static int sysctl_pax_aslr_exec(SYSCTL_HANDLER_ARGS);
> +
> +/*
> + * sysctls and tunables
> + */
> +int pax_aslr_status =3D PAX_ASLR_ENABLED;
> +int pax_aslr_debug =3D 0;
> +
> +#ifdef PAX_ASLR_MAX_SEC
> +int pax_aslr_mmap_len =3D PAX_ASLR_DELTA_MMAP_MAX_LEN;
> +int pax_aslr_stack_len =3D PAX_ASLR_DELTA_STACK_MAX_LEN;
> +int pax_aslr_exec_len =3D PAX_ASLR_DELTA_EXEC_MAX_LEN;
> +#else
> +int pax_aslr_mmap_len =3D PAX_ASLR_DELTA_MMAP_MIN_LEN;
> +int pax_aslr_stack_len =3D PAX_ASLR_DELTA_STACK_MIN_LEN;
> +int pax_aslr_exec_len =3D PAX_ASLR_DELTA_EXEC_MIN_LEN;
> +#endif /* PAX_ASLR_MAX_SEC */
> +
> +
> +SYSCTL_NODE(_security, OID_AUTO, pax, CTLFLAG_RD, 0,
> + "PaX (exploit mitigation) features.");
> +SYSCTL_NODE(_security_pax, OID_AUTO, aslr, CTLFLAG_RD, 0,
> + "Address Space Layout Randomization.");
> +
> +SYSCTL_PROC(_security_pax_aslr, OID_AUTO, status,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_status, "I",
> + "Restrictions status. "
> + "0 - disabled, "
> + "1 - enabled, "
> + "2 - global enabled, "
> + "3 - force global enabled");
> +TUNABLE_INT("security.pax.aslr.status", &pax_aslr_status);
> +
> +SYSCTL_INT(_security_pax_aslr, OID_AUTO, debug, =
> CTLFLAG_RWTUN|CTLFLAG_PRISON, &pax_aslr_debug, 0, "ASLR debug mode");
> +TUNABLE_INT("security.pax.aslr.debug", &pax_aslr_debug);
> +
> +SYSCTL_PROC(_security_pax_aslr, OID_AUTO, mmap_len,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_mmap, "I",
> + "Number of bits randomized for mmap(2) calls. "
> + "32 bit: [8,16] 64 bit: [16,32]");
> +TUNABLE_INT("security.pax.aslr.mmap", &pax_aslr_mmap_len);
> +
> +SYSCTL_PROC(_security_pax_aslr, OID_AUTO, stack_len,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_stack, "I",
> + "Number of bits randomized for the stack. "
> + "32 bit: [6,12] 64 bit: [12,21]");
> +TUNABLE_INT("security.pax.aslr.stack", &pax_aslr_stack_len);
> +
> +SYSCTL_PROC(_security_pax_aslr, OID_AUTO, exec_len,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_exec, "I",
> + "Number of bits randomized for the PIE exec base. "
> + "32 bit: [6,12] 64 bit: [12,21]");
> +TUNABLE_INT("security.pax.aslr.stack", &pax_aslr_exec_len);
> +
> +static int
> +sysctl_pax_aslr_status(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D (pr !=3D NULL) ? pr->pr_pax_aslr_status : pax_aslr_status;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + switch (val) {
> + case PAX_ASLR_DISABLED:
> + case PAX_ASLR_ENABLED:
> + case PAX_ASLR_GLOBAL_ENABLED:
> + case PAX_ASLR_FORCE_GLOBAL_ENABLED:
> + pax_aslr_status =3D val;
> + if (pr)
> + pr->pr_pax_aslr_status =3D val;
> + break;
> + default:
> + return (EINVAL);
> + }
> +
> + return (0);
> +}
> +
> +static int
> +sysctl_pax_aslr_mmap(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D (pr !=3D NULL) ? pr->pr_pax_aslr_mmap_len : =
> pax_aslr_mmap_len;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + if (val < PAX_ASLR_DELTA_MMAP_MIN_LEN
> + || val > PAX_ASLR_DELTA_MMAP_MAX_LEN)
> + return (EINVAL);
> +
> + pax_aslr_mmap_len =3D val;
> + if (pr)
> + pr->pr_pax_aslr_mmap_len =3D val;
> +
> + return (0);
> +}
> +
> +static int
> +sysctl_pax_aslr_stack(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D (pr !=3D NULL) ? pr->pr_pax_aslr_stack_len : =
> pax_aslr_stack_len;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + if (val < PAX_ASLR_DELTA_STACK_MIN_LEN
> + || val > PAX_ASLR_DELTA_STACK_MAX_LEN)
> + return (EINVAL);
> +
> + pax_aslr_stack_len =3D val;
> + if (pr)
> + pr->pr_pax_aslr_stack_len =3D val;
> +
> + return (0);
> +}
> +
> +static int
> +sysctl_pax_aslr_exec(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D (pr !=3D NULL) ? pr->pr_pax_aslr_exec_len : =
> pax_aslr_exec_len;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + if (val < PAX_ASLR_DELTA_EXEC_MIN_LEN
> + || val > PAX_ASLR_DELTA_EXEC_MAX_LEN)
> + return (EINVAL);
> +
> + pax_aslr_exec_len =3D val;
> + if (pr)
> + pr->pr_pax_aslr_exec_len =3D val;
> +
> + return (0);
> +}
> +
> +/*
> + * COMPAT_FREEBSD32 and linuxulator..
> + */
> +#ifdef COMPAT_FREEBSD32
> +int pax_aslr_compat_status =3D PAX_ASLR_ENABLED;
> +
> +static int sysctl_pax_aslr_compat_status(SYSCTL_HANDLER_ARGS);
> +static int sysctl_pax_aslr_compat_mmap(SYSCTL_HANDLER_ARGS);
> +static int sysctl_pax_aslr_compat_stack(SYSCTL_HANDLER_ARGS);
> +static int sysctl_pax_aslr_compat_exec(SYSCTL_HANDLER_ARGS);
> +
> +#ifdef PAX_ASLR_MAX_SEC
> +int pax_aslr_compat_mmap_len =3D PAX_ASLR_COMPAT_DELTA_MMAP_MAX_LEN;
> +int pax_aslr_compat_stack_len =3D PAX_ASLR_COMPAT_DELTA_STACK_MAX_LEN;
> +int pax_aslr_compat_exec_len =3D PAX_ASLR_COMPAT_DELTA_EXEC_MAX_LEN;
> +#else
> +int pax_aslr_compat_mmap_len =3D PAX_ASLR_COMPAT_DELTA_MMAP_MIN_LEN;
> +int pax_aslr_compat_stack_len =3D PAX_ASLR_COMPAT_DELTA_STACK_MIN_LEN;
> +int pax_aslr_compat_exec_len =3D PAX_ASLR_COMPAT_DELTA_EXEC_MIN_LEN;
> +#endif /* PAX_ASLR_MAX_SEC */
> +
> +SYSCTL_NODE(_security_pax_aslr, OID_AUTO, compat, CTLFLAG_RD, 0,
> + "Setting for COMPAT_FREEBSD32 and linuxulator.");
> +
> +SYSCTL_PROC(_security_pax_aslr_compat, OID_AUTO, status,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_compat_status, "I",
> + "Restrictions status. "
> + "0 - disabled, "
> + "1 - enabled, "
> + "2 - global enabled, "
> + "3 - force global enabled");
> +TUNABLE_INT("security.pax.aslr.compat.status", =
> &pax_aslr_compat_status);
> +
> +SYSCTL_PROC(_security_pax_aslr_compat, OID_AUTO, mmap_len,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_compat_mmap, "I",
> + "Number of bits randomized for mmap(2) calls. "
> + "32 bit: [8,16]");
> +TUNABLE_INT("security.pax.aslr.compat.mmap", =
> &pax_aslr_compat_mmap_len);
> +
> +SYSCTL_PROC(_security_pax_aslr_compat, OID_AUTO, stack_len,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_compat_stack, "I",
> + "Number of bits randomized for the stack. "
> + "32 bit: [6,12]");
> +TUNABLE_INT("security.pax.aslr.compat.stack", =
> &pax_aslr_compat_stack_len);
> +
> +SYSCTL_PROC(_security_pax_aslr_compat, OID_AUTO, exec_len,
> + CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_TUN|CTLFLAG_PRISON,
> + NULL, 0, sysctl_pax_aslr_compat_exec, "I",
> + "Number of bits randomized for the PIE exec base. "
> + "32 bit: [6,12]");
> +TUNABLE_INT("security.pax.aslr.compat.stack", =
> &pax_aslr_compat_exec_len);
> +
> +
> +static int
> +sysctl_pax_aslr_compat_status(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val, *ptr;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> + ptr =3D (pr !=3D NULL) ? &(pr->pr_pax_aslr_compat_status) : =
> &pax_aslr_compat_status;
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D *ptr;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + switch (val) {
> + case PAX_ASLR_DISABLED:
> + case PAX_ASLR_ENABLED:
> + case PAX_ASLR_GLOBAL_ENABLED:
> + case PAX_ASLR_FORCE_GLOBAL_ENABLED:
> + pax_aslr_compat_status =3D val;
> + *ptr =3D val;
> + break;
> + default:
> + return (EINVAL);
> + }
> +
> + return (0);
> +}
> +
> +static int
> +sysctl_pax_aslr_compat_mmap(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val, *ptr;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> + ptr =3D (pr !=3D NULL) ? &(pr->pr_pax_aslr_compat_mmap_len) : =
> &pax_aslr_compat_mmap_len;
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D *ptr;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + if (val < PAX_ASLR_COMPAT_DELTA_MMAP_MIN_LEN
> + || val > PAX_ASLR_COMPAT_DELTA_MMAP_MAX_LEN)
> + return (EINVAL);
> +
> + pax_aslr_compat_mmap_len =3D val;
> + *ptr =3D val;
> +
> + return (0);
> +}
> +
> +static int
> +sysctl_pax_aslr_compat_stack(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val, *ptr;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> + ptr =3D (pr !=3D NULL) ? &(pr->pr_pax_aslr_compat_stack_len) : =
> &pax_aslr_compat_stack_len;
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D (pr !=3D NULL) ? pr->pr_pax_aslr_compat_stack_len : =
> pax_aslr_compat_stack_len;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + if (val < PAX_ASLR_COMPAT_DELTA_STACK_MIN_LEN
> + || val > PAX_ASLR_COMPAT_DELTA_STACK_MAX_LEN)
> + return (EINVAL);
> +
> + pax_aslr_compat_stack_len =3D val;
> + *ptr =3D val;
> +
> + return (0);
> +}
> +
> +static int
> +sysctl_pax_aslr_compat_exec(SYSCTL_HANDLER_ARGS)
> +{
> + int err;
> + int val, *ptr;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(req->td, NULL);
> + ptr =3D (pr !=3D NULL) ? &(pr->pr_pax_aslr_compat_exec_len) : =
> &pax_aslr_compat_exec_len;
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + val =3D *ptr;
> + err =3D sysctl_handle_int(oidp, &val, sizeof(int), req);
> + if (err || !req->newptr)
> + return (err);
> +
> + if (val < PAX_ASLR_COMPAT_DELTA_EXEC_MIN_LEN
> + || val > PAX_ASLR_COMPAT_DELTA_EXEC_MAX_LEN)
> + return (EINVAL);
> +
> + pax_aslr_compat_exec_len =3D val;
> + *ptr =3D val;
> +
> + return (0);
> +}
> +#endif /* COMPAT_FREEBSD32 */
> +
> +
> +/*
> + * ASLR functions
> + */
> +bool
> +pax_aslr_active(struct thread *td, struct proc *proc)
> +{
> + int status;
> + struct prison *pr=3DNULL;
> +#ifdef notyet
> + uint32_t flags;
> +#endif /* notyet */
> +
> + if (!(td) && !(proc))
> + return (true);
> +
> +#ifdef notyet
> + flags =3D (td !=3D NULL) ? td->td_proc->p_pax : proc->p_pax;
> +#endif /* notyet */
> + pr =3D pax_aslr_get_prison(td, proc);
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + status =3D (pr !=3D NULL) ? pr->pr_pax_aslr_status : =
> pax_aslr_status;
> +
> + switch (status) {
> + case PAX_ASLR_DISABLED:
> + return (false);
> + case PAX_ASLR_FORCE_GLOBAL_ENABLED:
> + return (true);
> + case PAX_ASLR_ENABLED:
> +#ifdef notyet
> + if ((flags & ELF_NOTE_PAX_ASLR) =3D=3D 0)
> + return (false);
> +#endif /* notyet */
> + break;
> + case PAX_ASLR_GLOBAL_ENABLED:
> +#ifdef notyet
> + if ((flags & ELF_NOTE_PAX_NOASLR) !=3D 0)
> + return (false);
> +#endif /* notyet */
> + break;
> + default:
> + return (true);
> + }
> +
> + return (true);
> +}
> +
> +struct prison *
> +pax_aslr_get_prison(struct thread *td, struct proc *proc)
> +{
> + if ((td)) {
> + if ((td->td_proc) && (td->td_proc->p_ucred))
> + return td->td_proc->p_ucred->cr_prison;
> +
> + return NULL;
> + }
> +
> + if (!(proc))
> + return NULL;
> +
> + return proc->p_ucred->cr_prison;
> +}
> +
> +void
> +pax_aslr_init_prison(struct prison *pr)
> +{
> + if (!(pr))
> + return;
> +
> + if (pr->pr_pax_set)
> + return;
> +
> + if (pax_aslr_debug)
> + uprintf("[PaX ASLR] pax_aslr_init_prison: Setting prison %s =
> ASLR variables\n", pr->pr_name);
> +
> + pr->pr_pax_aslr_status =3D pax_aslr_status;
> + pr->pr_pax_aslr_debug =3D pax_aslr_debug;
> + pr->pr_pax_aslr_mmap_len =3D pax_aslr_mmap_len;
> + pr->pr_pax_aslr_stack_len =3D pax_aslr_stack_len;
> + pr->pr_pax_aslr_exec_len =3D pax_aslr_exec_len;
> +
> +#ifdef COMPAT_FREEBSD32
> + pr->pr_pax_aslr_compat_status =3D pax_aslr_compat_status;
> + pr->pr_pax_aslr_compat_mmap_len =3D pax_aslr_compat_mmap_len;
> + pr->pr_pax_aslr_compat_stack_len =3D pax_aslr_compat_stack_len;
> + pr->pr_pax_aslr_compat_exec_len =3D pax_aslr_compat_exec_len;
> +#endif /* COMPAT_FREEBSD32 */
> +
> + pr->pr_pax_set =3D 1;
> +}
> +
> +void
> +pax_aslr_init(struct thread *td, struct image_params *imgp)
> +{
> + struct vmspace *vm;
> + u_int sv_flags;
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(td, NULL);
> +
> + if ((pr) && !(pr->pr_pax_set))
> + pax_aslr_init_prison(pr);
> +
> + if (imgp =3D=3D NULL) {
> + panic("[PaX ASLR] pax_aslr_init - imgp =3D=3D NULL");
> + }
> +
> + if (!pax_aslr_active(td, NULL))
> + return;
> +
> + vm =3D imgp->proc->p_vmspace;
> + sv_flags =3D imgp->proc->p_sysent->sv_flags;
> +
> +#ifndef COMPAT_FREEBSD32
> + vm->vm_aslr_delta_mmap =3D PAX_ASLR_DELTA(arc4random(),
> + PAX_ASLR_DELTA_MMAP_LSB, (pr !=3D NULL) ? =
> pr->pr_pax_aslr_mmap_len : pax_aslr_mmap_len);
> + vm->vm_aslr_delta_stack =3D PAX_ASLR_DELTA(arc4random(),
> + PAX_ASLR_DELTA_STACK_LSB, (pr !=3D NULL) ? =
> pr->pr_pax_aslr_stack_len : pax_aslr_stack_len);
> + vm->vm_aslr_delta_stack =3D ALIGN(vm->vm_aslr_delta_stack);
> + vm->vm_aslr_delta_exec =3D round_page(PAX_ASLR_DELTA(arc4random(), =
> PAX_ASLR_DELTA_EXEC_LSB, (pr !=3D NULL) ? pr->pr_pax_aslr_exec_len : =
> pax_aslr_exec_len));
> +#else /* COMPAT_FREEBSD32 */
> + if ((sv_flags & SV_LP64) !=3D 0) {
> + vm->vm_aslr_delta_mmap =3D PAX_ASLR_DELTA(arc4random(),
> + PAX_ASLR_DELTA_MMAP_LSB, (pr !=3D NULL) ? =
> pr->pr_pax_aslr_mmap_len : pax_aslr_mmap_len);
> + vm->vm_aslr_delta_stack =3D PAX_ASLR_DELTA(arc4random(),
> + PAX_ASLR_DELTA_STACK_LSB, (pr !=3D NULL) ? =
> pr->pr_pax_aslr_stack_len : pax_aslr_stack_len);
> + vm->vm_aslr_delta_stack =3D ALIGN(vm->vm_aslr_delta_stack);
> + } else {
> + vm->vm_aslr_delta_mmap =3D PAX_ASLR_DELTA(arc4random(),
> + PAX_ASLR_COMPAT_DELTA_MMAP_LSB, (pr !=3D NULL) ? =
> pr->pr_pax_aslr_compat_mmap_len : pax_aslr_compat_mmap_len);
> + vm->vm_aslr_delta_stack =3D PAX_ASLR_DELTA(arc4random(),
> + PAX_ASLR_COMPAT_DELTA_STACK_LSB, (pr !=3D NULL) ? =
> pr->pr_pax_aslr_compat_stack_len : pax_aslr_compat_stack_len);
> + vm->vm_aslr_delta_stack =3D ALIGN(vm->vm_aslr_delta_stack);
> + }
> +#endif /* !COMPAT_FREEBSD32 */
> +}
> +
> +void
> +pax_aslr_mmap(struct thread *td, vm_offset_t *addr, vm_offset_t =
> orig_addr, int flags)
> +{
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(td, NULL);
> +
> + if (!pax_aslr_active(td, NULL))
> + return;
> +
> + if (!(flags & MAP_FIXED) && ((orig_addr =3D=3D 0) || !(flags & =
> MAP_ANON))) {
> + if (pax_aslr_debug)
> + uprintf("[PaX ASLR] applying to %p orig_addr=3D%p f=3D%x\n",
> + (void *)*addr, (void *)orig_addr, flags);
> + if (!(td->td_proc->p_vmspace->vm_map.flags & =
> MAP_ENTRY_GROWS_DOWN))
> + *addr +=3D td->td_proc->p_vmspace->vm_aslr_delta_mmap;
> + else
> + *addr -=3D td->td_proc->p_vmspace->vm_aslr_delta_mmap;
> + if (pax_aslr_debug)
> + uprintf("[PaX ASLR] result %p\n", (void *)*addr);
> + }
> + else if (pax_aslr_debug)
> + uprintf("[PaX ASLR] not applying to %p orig_addr=3D%p f=3D%x\n",
> + (void *)*addr, (void *)orig_addr, flags);
> +}
> +
> +void
> +pax_aslr_stack(struct thread *td, char **addr, char *orig_addr)
> +{
> + struct prison *pr=3DNULL;
> +
> + pr =3D pax_aslr_get_prison(td, NULL);
> +
> + if (!pax_aslr_active(td, NULL))
> + return;
> +
> + *addr -=3D td->td_proc->p_vmspace->vm_aslr_delta_stack;
> + if ((pr) && pr->pr_pax_aslr_debug)
> + uprintf("[PaX ASLR] orig_addr=3D%p, addr=3D%p\n",
> + (void *)orig_addr, (void *)*addr);
> +}
> diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
> index f99e053..e575aa7 100644
> --- a/sys/kern/kern_prot.c
> +++ b/sys/kern/kern_prot.c
> @@ -1612,9 +1612,42 @@ p_cansched(struct thread *td, struct proc *p)
> * XXX: data declarations should be together near the beginning of the =
> file.
> */
> static int unprivileged_proc_debug =3D 1;
> +#if 0
> SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_proc_debug, =
> CTLFLAG_RW,
> &unprivileged_proc_debug, 0,
> "Unprivileged processes may use process debugging facilities");
> +#endif
> +
> +int
> +sysctl_unprivileged_proc_debug(SYSCTL_HANDLER_ARGS);
> +
> +SYSCTL_PROC(_security_bsd, OID_AUTO, unprivileged_proc_debug,
> + CTLTYPE_INT | CTLFLAG_RW, &unprivileged_proc_debug, 0,
> + sysctl_unprivileged_proc_debug, "I",
> + "Unprivileged processes may use process debugging facilities");
> +
> +int
> +sysctl_unprivileged_proc_debug(SYSCTL_HANDLER_ARGS)
> +{
> + static int set=3D0;
> + int error =3D 0;
> + int debug=3Dunprivileged_proc_debug;
> +
> + error =3D sysctl_handle_int(oidp, &debug, 0, req);
> + if (error =3D=3D 0 && req->newptr) {
> + if (debug < 0 || debug > 1)
> + return (EPERM);
> +
> + if (debug !=3D unprivileged_proc_debug && set =3D=3D 0) {
> + unprivileged_proc_debug =3D debug;
> + set++;
> + } else {
> + return (EPERM);
> + }
> + }
> +
> + return (error);
> +}
> =20
> /*-
> * Determine whether td may debug p.
> @@ -1631,11 +1664,9 @@ p_candebug(struct thread *td, struct proc *p)
> =20
> KASSERT(td =3D=3D curthread, ("%s: td not curthread", =
> __func__));
> PROC_LOCK_ASSERT(p, MA_OWNED);
> - if (!unprivileged_proc_debug) {
> - error =3D priv_check(td, PRIV_DEBUG_UNPRIV);
> - if (error)
> - return (error);
> - }
> + if (!unprivileged_proc_debug)
> + return (EPERM);
> +
> if (td->td_proc =3D=3D p)
> return (0);
> if ((error =3D prison_check(td->td_ucred, p->p_ucred)))
> diff --git a/sys/sys/jail.h b/sys/sys/jail.h
> index 59d791c..f2bb97c 100644
> --- a/sys/sys/jail.h
> +++ b/sys/sys/jail.h
> @@ -184,6 +184,20 @@ struct prison {
> char pr_hostname[MAXHOSTNAMELEN]; /* (p) jail =
> hostname */
> char pr_domainname[MAXHOSTNAMELEN]; /* (p) jail =
> domainname */
> char pr_hostuuid[HOSTUUIDLEN]; /* (p) jail =
> hostuuid */
> +#ifdef PAX_ASLR
> + int pr_pax_set;
> + int pr_pax_aslr_status;
> + int pr_pax_aslr_debug;
> + int pr_pax_aslr_mmap_len;
> + int pr_pax_aslr_stack_len;
> + int pr_pax_aslr_exec_len;
> +#endif /* PAX_ASLR */
> +#if defined(PAX_ASLR) && defined(COMPAT_FREEBSD32)
> + int pr_pax_aslr_compat_status;
> + int pr_pax_aslr_compat_mmap_len;
> + int pr_pax_aslr_compat_stack_len;
> + int pr_pax_aslr_compat_exec_len;
> +#endif /* COMPAT_FREEBSD32 */
> };
> =20
> struct prison_racct {
> diff --git a/sys/sys/pax.h b/sys/sys/pax.h
> new file mode 100644
> index 0000000..9c36894
> --- /dev/null
> +++ b/sys/sys/pax.h
> @@ -0,0 +1,166 @@
> +/*-
> + * Copyright (c) 2013, by Oliver Pinter <oliver.pntr at gmail.com>
> + * All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. The name of the developer may NOT be used to endorse or promote =
> products
> + * derived from this software without specific prior written =
> permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' =
> AND
> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, =
> THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR =
> PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE =
> LIABLE
> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR =
> CONSEQUENTIAL
> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE =
> GOODS
> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS =
> INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, =
> STRICT
> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN =
> ANY WAY
> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY =
> OF
> + * SUCH DAMAGE.
> + *
> + * $FreeBSD$
> + *
> + * Enhancements made by Shawn "lattera" Webb under the direction of =
> SoldierX.
> + */
> +
> +#ifndef __SYS_PAX_H
> +#define __SYS_PAX_H
> +
> +struct image_params;
> +struct thread;
> +struct vmspace;
> +struct vm_offset_t;
> +
> +/*
> + * used in sysctl handler
> + */
> +#define PAX_ASLR_DISABLED 0
> +#define PAX_ASLR_ENABLED 1
> +#define PAX_ASLR_GLOBAL_ENABLED 2
> +#define PAX_ASLR_FORCE_GLOBAL_ENABLED 3
> +
> +#ifndef PAX_ASLR_DELTA
> +#define PAX_ASLR_DELTA(delta, lsb, len) \
> + (((delta) & ((1UL << (len)) - 1)) << (lsb))
> +#endif /* PAX_ASLR_DELTA */
> +
> +#ifdef PAX_ASLR
> +/*
> + * generic ASLR values
> + *
> + * MMAP | 32 bit | 64 bit |
> + * +-------+--------+--------+
> + * | MIN | 8 bit | 16 bit |
> + * +-------+--------+--------+
> + * | MAX | 16 bit | 32 bit |
> + * +-------+--------+--------+
> + *
> + * STACK | 32 bit | 64 bit |
> + * +-------+--------+--------+
> + * | MIN | 6 bit | 12 bit |
> + * +-------+--------+--------+
> + * | MAX | 10 bit | 21 bit |
> + * +-------+--------+--------+
> + *
> + * EXEC | 32 bit | 64 bit |
> + * +-------+--------+--------+
> + * | MIN | 6 bit | 12 bit |
> + * +-------+--------+--------+
> + * | MAX | 10 bit | 21 bit |
> + * +-------+--------+--------+
> + *
> + */
> +#ifndef PAX_ASLR_DELTA_MMAP_LSB
> +#define PAX_ASLR_DELTA_MMAP_LSB PAGE_SHIFT
> +#endif /* PAX_ASLR_DELTA_MMAP_LSB */
> +
> +#ifndef PAX_ASLR_DELTA_MMAP_MIN_LEN
> +#define PAX_ASLR_DELTA_MMAP_MIN_LEN ((sizeof(void *) * NBBY) / 4)
> +#endif /* PAX_ASLR_DELTA_MMAP_MAX_LEN */
> +
> +#ifndef PAX_ASLR_DELTA_MMAP_MAX_LEN
> +#define PAX_ASLR_DELTA_MMAP_MAX_LEN ((sizeof(void *) * NBBY) / 2)
> +#endif /* PAX_ASLR_DELTA_MMAP_MAX_LEN */
> +
> +#ifndef PAX_ASLR_DELTA_STACK_LSB
> +#define PAX_ASLR_DELTA_STACK_LSB 3
> +#endif /* PAX_ASLR_DELTA_STACK_LSB */
> +
> +#ifndef PAX_ASLR_DELTA_STACK_MIN_LEN
> +#define PAX_ASLR_DELTA_STACK_MIN_LEN ((sizeof(void *) * NBBY) / 5)
> +#endif /* PAX_ASLR_DELTA_STACK_MAX_LEN */
> +
> +#ifndef PAX_ASLR_DELTA_STACK_MAX_LEN
> +#define PAX_ASLR_DELTA_STACK_MAX_LEN ((sizeof(void *) * NBBY) / 3)
> +#endif /* PAX_ASLR_DELTA_STACK_MAX_LEN */
> +
> +#ifndef PAX_ASLR_DELTA_EXEC_LSB
> +#define PAX_ASLR_DELTA_EXEC_LSB PAGE_SHIFT
> +#endif /* PAX_ASLR_DELTA_EXEC_LSB */
> +
> +#ifndef PAX_ASLR_DELTA_EXEC_MIN_LEN
> +#define PAX_ASLR_DELTA_EXEC_MIN_LEN ((sizeof(void *) * NBBY) / 5)
> +#endif /* PAX_ASLR_DELTA_EXEC_MAX_LEN */
> +
> +#ifndef PAX_ASLR_DELTA_EXEC_MAX_LEN
> +#define PAX_ASLR_DELTA_EXEC_MAX_LEN ((sizeof(void *) * NBBY) / 3)
> +#endif /* PAX_ASLR_DELTA_EXEC_MAX_LEN */
> +
> +/*
> + * ASLR values for COMPAT_FREEBSD32 and COMPAT_LINUX
> + */
> +#ifndef PAX_ASLR_COMPAT_DELTA_MMAP_LSB
> +#define PAX_ASLR_COMPAT_DELTA_MMAP_LSB PAGE_SHIFT
> +#endif /* PAX_ASLR_COMPAT_DELTA_MMAP_LSB */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_MMAP_MIN_LEN
> +#define PAX_ASLR_COMPAT_DELTA_MMAP_MIN_LEN ((sizeof(int) * NBBY) / =
> 4)
> +#endif /* PAX_ASLR_COMPAT_DELTA_MMAP_MAX_LEN */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_MMAP_MAX_LEN
> +#define PAX_ASLR_COMPAT_DELTA_MMAP_MAX_LEN ((sizeof(int) * NBBY) / =
> 2)
> +#endif /* PAX_ASLR_COMPAT_DELTA_MMAP_MAX_LEN */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_STACK_LSB
> +#define PAX_ASLR_COMPAT_DELTA_STACK_LSB 3
> +#endif /* PAX_ASLR_COMPAT_DELTA_STACK_LSB */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_STACK_MIN_LEN
> +#define PAX_ASLR_COMPAT_DELTA_STACK_MIN_LEN ((sizeof(int) * NBBY) / =
> 5)
> +#endif /* PAX_ASLR_COMPAT_DELTA_STACK_MAX_LEN */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_STACK_MAX_LEN
> +#define PAX_ASLR_COMPAT_DELTA_STACK_MAX_LEN ((sizeof(int) * NBBY) / =
> 3)
> +#endif /* PAX_ASLR_COMPAT_DELTA_STACK_MAX_LEN */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_EXEC_MIN_LEN
> +#define PAX_ASLR_COMPAT_DELTA_EXEC_MIN_LEN ((sizeof(int) * NBBY) / =
> 5)
> +#endif /* PAX_ASLR_COMPAT_DELTA_EXEC_MAX_LEN */
> +
> +#ifndef PAX_ASLR_COMPAT_DELTA_EXEC_MAX_LEN
> +#define PAX_ASLR_COMPAT_DELTA_EXEC_MAX_LEN ((sizeof(int) * NBBY) / =
> 3)
> +#endif /* PAX_ASLR_COMPAT_DELTA_EXEC_MAX_LEN */
> +
> +extern int pax_aslr_status;
> +extern int pax_aslr_debug;
> +extern int pax_aslr_compat_status;
> +
> +extern int pax_aslr_mmap_len;
> +extern int pax_aslr_stack_len;
> +extern int pax_aslr_exec_len;
> +#endif /* PAX_ASLR */
> +
> +void pax_init(void);
> +void pax_aslr_init_prison(struct prison *pr);
> +bool pax_aslr_active(struct thread *td, struct proc *proc);
> +void pax_aslr_init(struct thread *td, struct image_params *imgp);
> +void pax_aslr_mmap(struct thread *td, vm_offset_t *addr,
> + vm_offset_t orig_addr, int flags);
> +void pax_aslr_stack(struct thread *td, char **addr, char *orig_addr);
> +struct prison *pax_aslr_get_prison(struct thread *td, struct proc =
> *proc);
> +
> +#endif /* __SYS_PAX_H */
>
> --Apple-Mail=_B6453ACB-0EC9-4C80-B575-87E00F273BCF--
> _______________________________________________
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