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[src/trunk]: src/sys/sys Instead of returning 0 when sysctl kern.expose_addre...
details: https://anonhg.NetBSD.org/src/rev/0c2a59c8c93f
branches: trunk
changeset: 1013352:0c2a59c8c93f
user: christos <christos%NetBSD.org@localhost>
date: Wed Aug 26 22:56:55 2020 +0000
description:
Instead of returning 0 when sysctl kern.expose_address=0, return a random
hashed value of the data. This allows sockstat to work without exposing
kernel addresses or being setgid kmem.
diffstat:
sys/crypto/blake2/files.blake2s | 4 +-
sys/kern/init_main.c | 24 +++++++++-
sys/kern/kern_descrip.c | 16 +++---
sys/kern/kern_proc.c | 94 ++++++++++++++++++++--------------------
sys/sys/systm.h | 44 ++++++++++++++++---
5 files changed, 117 insertions(+), 65 deletions(-)
diffs (truncated from 331 to 300 lines):
diff -r 8f6f12023c8f -r 0c2a59c8c93f sys/crypto/blake2/files.blake2s
--- a/sys/crypto/blake2/files.blake2s Wed Aug 26 22:55:46 2020 +0000
+++ b/sys/crypto/blake2/files.blake2s Wed Aug 26 22:56:55 2020 +0000
@@ -1,5 +1,5 @@
-# $NetBSD: files.blake2s,v 1.1 2020/08/20 21:21:05 riastradh Exp $
+# $NetBSD: files.blake2s,v 1.2 2020/08/26 22:56:55 christos Exp $
define blake2s
-file crypto/blake2/blake2s.c blake2s
+file crypto/blake2/blake2s.c
diff -r 8f6f12023c8f -r 0c2a59c8c93f sys/kern/init_main.c
--- a/sys/kern/init_main.c Wed Aug 26 22:55:46 2020 +0000
+++ b/sys/kern/init_main.c Wed Aug 26 22:56:55 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: init_main.c,v 1.527 2020/06/11 19:20:46 ad Exp $ */
+/* $NetBSD: init_main.c,v 1.528 2020/08/26 22:56:55 christos Exp $ */
/*-
* Copyright (c) 2008, 2009, 2019 The NetBSD Foundation, Inc.
@@ -97,7 +97,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.527 2020/06/11 19:20:46 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.528 2020/08/26 22:56:55 christos Exp $");
#include "opt_ddb.h"
#include "opt_inet.h"
@@ -228,6 +228,8 @@
#include <prop/proplib.h>
+#include <crypto/blake2/blake2s.h>
+
#include <sys/userconf.h>
extern struct lwp lwp0;
@@ -730,6 +732,24 @@
/* NOTREACHED */
}
+static uint8_t address_key[32]; /* key used in address hashing */
+static ONCE_DECL(random_inithook);
+
+static int
+random_address_init(void)
+{
+ cprng_strong(kern_cprng, address_key, sizeof(address_key), 0);
+ return 0;
+}
+
+void
+hash_value(void *d, size_t ds, const void *s, size_t ss)
+{
+
+ RUN_ONCE(&random_inithook, random_address_init);
+ blake2s(d, ds, address_key, sizeof(address_key), s, ss);
+}
+
/*
* Configure the system's hardware.
*/
diff -r 8f6f12023c8f -r 0c2a59c8c93f sys/kern/kern_descrip.c
--- a/sys/kern/kern_descrip.c Wed Aug 26 22:55:46 2020 +0000
+++ b/sys/kern/kern_descrip.c Wed Aug 26 22:56:55 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_descrip.c,v 1.246 2020/05/23 23:42:43 ad Exp $ */
+/* $NetBSD: kern_descrip.c,v 1.247 2020/08/26 22:56:55 christos Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_descrip.c,v 1.246 2020/05/23 23:42:43 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_descrip.c,v 1.247 2020/08/26 22:56:55 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -2305,11 +2305,11 @@
memset(fp, 0, sizeof(*fp));
fp->f_offset = fpsrc->f_offset;
- COND_SET_VALUE(fp->f_cred, fpsrc->f_cred, allowaddr);
- COND_SET_VALUE(fp->f_ops, fpsrc->f_ops, allowaddr);
- COND_SET_VALUE(fp->f_undata, fpsrc->f_undata, allowaddr);
- COND_SET_VALUE(fp->f_list, fpsrc->f_list, allowaddr);
- COND_SET_VALUE(fp->f_lock, fpsrc->f_lock, allowaddr);
+ COND_SET_PTR(fp->f_cred, fpsrc->f_cred, allowaddr);
+ COND_SET_CPTR(fp->f_ops, fpsrc->f_ops, allowaddr);
+ COND_SET_STRUCT(fp->f_undata, fpsrc->f_undata, allowaddr);
+ COND_SET_STRUCT(fp->f_list, fpsrc->f_list, allowaddr);
+ COND_SET_STRUCT(fp->f_lock, fpsrc->f_lock, allowaddr);
fp->f_flag = fpsrc->f_flag;
fp->f_marker = fpsrc->f_marker;
fp->f_type = fpsrc->f_type;
@@ -2317,7 +2317,7 @@
fp->f_count = fpsrc->f_count;
fp->f_msgcount = fpsrc->f_msgcount;
fp->f_unpcount = fpsrc->f_unpcount;
- COND_SET_VALUE(fp->f_unplist, fpsrc->f_unplist, allowaddr);
+ COND_SET_STRUCT(fp->f_unplist, fpsrc->f_unplist, allowaddr);
}
static void
diff -r 8f6f12023c8f -r 0c2a59c8c93f sys/kern/kern_proc.c
--- a/sys/kern/kern_proc.c Wed Aug 26 22:55:46 2020 +0000
+++ b/sys/kern/kern_proc.c Wed Aug 26 22:56:55 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_proc.c,v 1.255 2020/06/11 19:20:46 ad Exp $ */
+/* $NetBSD: kern_proc.c,v 1.256 2020/08/26 22:56:55 christos Exp $ */
/*-
* Copyright (c) 1999, 2006, 2007, 2008, 2020 The NetBSD Foundation, Inc.
@@ -62,7 +62,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_proc.c,v 1.255 2020/06/11 19:20:46 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_proc.c,v 1.256 2020/08/26 22:56:55 christos Exp $");
#ifdef _KERNEL_OPT
#include "opt_kstack.h"
@@ -2575,23 +2575,23 @@
static void
fill_proc(const struct proc *psrc, struct proc *p, bool allowaddr)
{
- COND_SET_VALUE(p->p_list, psrc->p_list, allowaddr);
- COND_SET_VALUE(p->p_auxlock, psrc->p_auxlock, allowaddr);
- COND_SET_VALUE(p->p_lock, psrc->p_lock, allowaddr);
- COND_SET_VALUE(p->p_stmutex, psrc->p_stmutex, allowaddr);
- COND_SET_VALUE(p->p_reflock, psrc->p_reflock, allowaddr);
- COND_SET_VALUE(p->p_waitcv, psrc->p_waitcv, allowaddr);
- COND_SET_VALUE(p->p_lwpcv, psrc->p_lwpcv, allowaddr);
- COND_SET_VALUE(p->p_cred, psrc->p_cred, allowaddr);
- COND_SET_VALUE(p->p_fd, psrc->p_fd, allowaddr);
- COND_SET_VALUE(p->p_cwdi, psrc->p_cwdi, allowaddr);
- COND_SET_VALUE(p->p_stats, psrc->p_stats, allowaddr);
- COND_SET_VALUE(p->p_limit, psrc->p_limit, allowaddr);
- COND_SET_VALUE(p->p_vmspace, psrc->p_vmspace, allowaddr);
- COND_SET_VALUE(p->p_sigacts, psrc->p_sigacts, allowaddr);
- COND_SET_VALUE(p->p_aio, psrc->p_aio, allowaddr);
+ COND_SET_STRUCT(p->p_list, psrc->p_list, allowaddr);
+ COND_SET_STRUCT(p->p_auxlock, psrc->p_auxlock, allowaddr);
+ COND_SET_STRUCT(p->p_lock, psrc->p_lock, allowaddr);
+ COND_SET_STRUCT(p->p_stmutex, psrc->p_stmutex, allowaddr);
+ COND_SET_STRUCT(p->p_reflock, psrc->p_reflock, allowaddr);
+ COND_SET_STRUCT(p->p_waitcv, psrc->p_waitcv, allowaddr);
+ COND_SET_STRUCT(p->p_lwpcv, psrc->p_lwpcv, allowaddr);
+ COND_SET_PTR(p->p_cred, psrc->p_cred, allowaddr);
+ COND_SET_PTR(p->p_fd, psrc->p_fd, allowaddr);
+ COND_SET_PTR(p->p_cwdi, psrc->p_cwdi, allowaddr);
+ COND_SET_PTR(p->p_stats, psrc->p_stats, allowaddr);
+ COND_SET_PTR(p->p_limit, psrc->p_limit, allowaddr);
+ COND_SET_PTR(p->p_vmspace, psrc->p_vmspace, allowaddr);
+ COND_SET_PTR(p->p_sigacts, psrc->p_sigacts, allowaddr);
+ COND_SET_PTR(p->p_aio, psrc->p_aio, allowaddr);
p->p_mqueue_cnt = psrc->p_mqueue_cnt;
- COND_SET_VALUE(p->p_specdataref, psrc->p_specdataref, allowaddr);
+ COND_SET_STRUCT(p->p_specdataref, psrc->p_specdataref, allowaddr);
p->p_exitsig = psrc->p_exitsig;
p->p_flag = psrc->p_flag;
p->p_sflag = psrc->p_sflag;
@@ -2601,12 +2601,12 @@
p->p_stat = psrc->p_stat;
p->p_trace_enabled = psrc->p_trace_enabled;
p->p_pid = psrc->p_pid;
- COND_SET_VALUE(p->p_pglist, psrc->p_pglist, allowaddr);
- COND_SET_VALUE(p->p_pptr, psrc->p_pptr, allowaddr);
- COND_SET_VALUE(p->p_sibling, psrc->p_sibling, allowaddr);
- COND_SET_VALUE(p->p_children, psrc->p_children, allowaddr);
- COND_SET_VALUE(p->p_lwps, psrc->p_lwps, allowaddr);
- COND_SET_VALUE(p->p_raslist, psrc->p_raslist, allowaddr);
+ COND_SET_STRUCT(p->p_pglist, psrc->p_pglist, allowaddr);
+ COND_SET_PTR(p->p_pptr, psrc->p_pptr, allowaddr);
+ COND_SET_STRUCT(p->p_sibling, psrc->p_sibling, allowaddr);
+ COND_SET_STRUCT(p->p_children, psrc->p_children, allowaddr);
+ COND_SET_STRUCT(p->p_lwps, psrc->p_lwps, allowaddr);
+ COND_SET_PTR(p->p_raslist, psrc->p_raslist, allowaddr);
p->p_nlwps = psrc->p_nlwps;
p->p_nzlwps = psrc->p_nzlwps;
p->p_nrlwps = psrc->p_nrlwps;
@@ -2614,15 +2614,15 @@
p->p_ndlwps = psrc->p_ndlwps;
p->p_nstopchild = psrc->p_nstopchild;
p->p_waited = psrc->p_waited;
- COND_SET_VALUE(p->p_zomblwp, psrc->p_zomblwp, allowaddr);
- COND_SET_VALUE(p->p_vforklwp, psrc->p_vforklwp, allowaddr);
- COND_SET_VALUE(p->p_sched_info, psrc->p_sched_info, allowaddr);
+ COND_SET_PTR(p->p_zomblwp, psrc->p_zomblwp, allowaddr);
+ COND_SET_PTR(p->p_vforklwp, psrc->p_vforklwp, allowaddr);
+ COND_SET_PTR(p->p_sched_info, psrc->p_sched_info, allowaddr);
p->p_estcpu = psrc->p_estcpu;
p->p_estcpu_inherited = psrc->p_estcpu_inherited;
p->p_forktime = psrc->p_forktime;
p->p_pctcpu = psrc->p_pctcpu;
- COND_SET_VALUE(p->p_opptr, psrc->p_opptr, allowaddr);
- COND_SET_VALUE(p->p_timers, psrc->p_timers, allowaddr);
+ COND_SET_PTR(p->p_opptr, psrc->p_opptr, allowaddr);
+ COND_SET_PTR(p->p_timers, psrc->p_timers, allowaddr);
p->p_rtime = psrc->p_rtime;
p->p_uticks = psrc->p_uticks;
p->p_sticks = psrc->p_sticks;
@@ -2630,30 +2630,32 @@
p->p_xutime = psrc->p_xutime;
p->p_xstime = psrc->p_xstime;
p->p_traceflag = psrc->p_traceflag;
- COND_SET_VALUE(p->p_tracep, psrc->p_tracep, allowaddr);
- COND_SET_VALUE(p->p_textvp, psrc->p_textvp, allowaddr);
- COND_SET_VALUE(p->p_emul, psrc->p_emul, allowaddr);
- COND_SET_VALUE(p->p_emuldata, psrc->p_emuldata, allowaddr);
- COND_SET_VALUE(p->p_execsw, psrc->p_execsw, allowaddr);
- COND_SET_VALUE(p->p_klist, psrc->p_klist, allowaddr);
- COND_SET_VALUE(p->p_sigwaiters, psrc->p_sigwaiters, allowaddr);
- COND_SET_VALUE(p->p_sigpend, psrc->p_sigpend, allowaddr);
- COND_SET_VALUE(p->p_lwpctl, psrc->p_lwpctl, allowaddr);
+ COND_SET_PTR(p->p_tracep, psrc->p_tracep, allowaddr);
+ COND_SET_PTR(p->p_textvp, psrc->p_textvp, allowaddr);
+ COND_SET_PTR(p->p_emul, psrc->p_emul, allowaddr);
+ COND_SET_PTR(p->p_emuldata, psrc->p_emuldata, allowaddr);
+ COND_SET_CPTR(p->p_execsw, psrc->p_execsw, allowaddr);
+ COND_SET_STRUCT(p->p_klist, psrc->p_klist, allowaddr);
+ COND_SET_STRUCT(p->p_sigwaiters, psrc->p_sigwaiters, allowaddr);
+ COND_SET_STRUCT(p->p_sigpend.sp_info, psrc->p_sigpend.sp_info,
+ allowaddr);
+ p->p_sigpend.sp_set = psrc->p_sigpend.sp_set;
+ COND_SET_PTR(p->p_lwpctl, psrc->p_lwpctl, allowaddr);
p->p_ppid = psrc->p_ppid;
p->p_oppid = psrc->p_oppid;
- COND_SET_VALUE(p->p_path, psrc->p_path, allowaddr);
- COND_SET_VALUE(p->p_sigctx, psrc->p_sigctx, allowaddr);
+ COND_SET_PTR(p->p_path, psrc->p_path, allowaddr);
+ p->p_sigctx = psrc->p_sigctx;
p->p_nice = psrc->p_nice;
memcpy(p->p_comm, psrc->p_comm, sizeof(p->p_comm));
- COND_SET_VALUE(p->p_pgrp, psrc->p_pgrp, allowaddr);
+ COND_SET_PTR(p->p_pgrp, psrc->p_pgrp, allowaddr);
COND_SET_VALUE(p->p_psstrp, psrc->p_psstrp, allowaddr);
p->p_pax = psrc->p_pax;
p->p_xexit = psrc->p_xexit;
p->p_xsig = psrc->p_xsig;
p->p_acflag = psrc->p_acflag;
- COND_SET_VALUE(p->p_md, psrc->p_md, allowaddr);
+ COND_SET_STRUCT(p->p_md, psrc->p_md, allowaddr);
p->p_stackbase = psrc->p_stackbase;
- COND_SET_VALUE(p->p_dtrace, psrc->p_dtrace, allowaddr);
+ COND_SET_PTR(p->p_dtrace, psrc->p_dtrace, allowaddr);
}
/*
@@ -2668,8 +2670,8 @@
KASSERT(mutex_owned(&proc_lock));
KASSERT(mutex_owned(p->p_lock));
- COND_SET_VALUE(ep->e_paddr, p, allowaddr);
- COND_SET_VALUE(ep->e_sess, p->p_session, allowaddr);
+ COND_SET_PTR(ep->e_paddr, p, allowaddr);
+ COND_SET_PTR(ep->e_sess, p->p_session, allowaddr);
if (p->p_cred) {
kauth_cred_topcred(p->p_cred, &ep->e_pcred);
kauth_cred_toucred(p->p_cred, &ep->e_ucred);
@@ -2700,7 +2702,7 @@
(tp = p->p_session->s_ttyp)) {
ep->e_tdev = tp->t_dev;
ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PGID;
- COND_SET_VALUE(ep->e_tsess, tp->t_session, allowaddr);
+ COND_SET_PTR(ep->e_tsess, tp->t_session, allowaddr);
} else
ep->e_tdev = (uint32_t)NODEV;
ep->e_flag = p->p_session->s_ttyvp ? EPROC_CTTY : 0;
diff -r 8f6f12023c8f -r 0c2a59c8c93f sys/sys/systm.h
--- a/sys/sys/systm.h Wed Aug 26 22:55:46 2020 +0000
+++ b/sys/sys/systm.h Wed Aug 26 22:56:55 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: systm.h,v 1.295 2020/06/30 16:20:03 maxv Exp $ */
+/* $NetBSD: systm.h,v 1.296 2020/08/26 22:56:55 christos Exp $ */
/*-
* Copyright (c) 1982, 1988, 1991, 1993
@@ -190,13 +190,43 @@
};
#ifdef _KERNEL
+#define COND_SET_STRUCT(dst, src, allow) \
+ do { \
+ CTASSERT(sizeof(src) < 32); \
+ if (allow) \
+ dst = src; \
+ else \
+ hash_value(&dst, sizeof(dst), &src, sizeof(src)); \
+ } while (/*CONSTCOND*/0)
+
+#define COND_SET_CPTR(dst, src, allow) \
+ do { \
+ void *__v; \
+ if (allow) \
+ dst = src; \
+ else \
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