Add locking around veriexec operations to prevent all sorts of badness
happening. This fixes kern/38646.
This commit is contained in:
blymn
parent
616225d114
commit
762e875434
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@ -1,4 +1,4 @@
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/* $NetBSD: kern_verifiedexec.c,v 1.108 2008/02/23 16:05:17 chris Exp $ */
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/* $NetBSD: kern_verifiedexec.c,v 1.109 2008/07/20 08:50:20 blymn Exp $ */
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/*-
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* Copyright (c) 2005, 2006 Elad Efrat <elad@NetBSD.org>
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@ -29,7 +29,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_verifiedexec.c,v 1.108 2008/02/23 16:05:17 chris Exp $");
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__KERNEL_RCSID(0, "$NetBSD: kern_verifiedexec.c,v 1.109 2008/07/20 08:50:20 blymn Exp $");
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#include "opt_veriexec.h"
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@ -41,6 +41,7 @@ __KERNEL_RCSID(0, "$NetBSD: kern_verifiedexec.c,v 1.108 2008/02/23 16:05:17 chri
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#include <sys/exec.h>
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#include <sys/once.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <sys/inttypes.h>
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@ -73,6 +74,13 @@ __KERNEL_RCSID(0, "$NetBSD: kern_verifiedexec.c,v 1.108 2008/02/23 16:05:17 chri
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#define REPORT_ALARM 0x10 /* Alarm - also print pid/uid/.. */
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#define REPORT_LOGMASK (REPORT_ALWAYS|REPORT_VERBOSE|REPORT_DEBUG)
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/* state of locking for veriexec_file_verify */
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#define VERIEXEC_UNLOCKED 0x00 /* Nothing locked, callee does it */
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#define VERIEXEC_LOCKED 0x01 /* Global op lock held */
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#define VERIEXEC_RW_UPGRADE(lock) while((rw_tryupgrade(lock)) == 0){};
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struct veriexec_fpops {
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const char *type;
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size_t hash_len;
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@ -85,6 +93,7 @@ struct veriexec_fpops {
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/* Veriexec per-file entry data. */
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struct veriexec_file_entry {
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krwlock_t lock; /* r/w lock */
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u_char *filename; /* File name. */
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u_char type; /* Entry type. */
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u_char status; /* Evaluation status. */
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@ -125,6 +134,13 @@ static void veriexec_file_free(struct veriexec_file_entry *);
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static unsigned int veriexec_tablecount = 0;
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/*
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* Veriexec operations global lock - most ops hold this as a read
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* lock, it is upgraded to a write lock when destroying veriexec file
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* table entries.
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*/
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static krwlock_t veriexec_op_lock;
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/*
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* Sysctl helper routine for Veriexec.
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*/
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@ -310,6 +326,8 @@ veriexec_init(void)
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if (error)
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panic("Veriexec: Can't create mountspecific key");
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rw_init(&veriexec_op_lock);
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#define FPOPS_ADD(a, b, c, d, e, f) \
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veriexec_fpops_add(a, b, c, (veriexec_fpop_init_t)d, \
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(veriexec_fpop_update_t)e, (veriexec_fpop_final_t)f)
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@ -366,9 +384,11 @@ veriexec_fpops_lookup(const char *name)
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/*
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* Calculate fingerprint. Information on hash length and routines used is
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* extracted from veriexec_hash_list according to the hash type.
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*
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* NOTE: vfe is assumed to be locked for writing on entry.
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*/
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static int
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veriexec_fp_calc(struct lwp *l, struct vnode *vp,
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veriexec_fp_calc(struct lwp *l, struct vnode *vp, int lock_state,
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struct veriexec_file_entry *vfe, u_char *fp)
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{
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struct vattr va;
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@ -414,11 +434,8 @@ veriexec_fp_calc(struct lwp *l, struct vnode *vp,
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error = vn_rdwr(UIO_READ, vp, buf, len, offset,
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UIO_SYSSPACE,
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#ifdef __FreeBSD__
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IO_NODELOCKED,
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#else
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0,
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#endif
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((lock_state == VERIEXEC_LOCKED)?
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IO_NODELOCKED : 0),
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l->l_cred, &resid, NULL);
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if (error) {
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@ -554,17 +571,26 @@ veriexec_file_report(struct veriexec_file_entry *vfe, const u_char *msg,
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* sys_execve(), 'flag' will be VERIEXEC_DIRECT. If we're called from
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* exec_script(), 'flag' will be VERIEXEC_INDIRECT. If we are called from
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* vn_open(), 'flag' will be VERIEXEC_FILE.
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*
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* NOTE: The veriexec file entry pointer (vfep) will be returned LOCKED
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* on no error.
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*/
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static int
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veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int flag,
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struct veriexec_file_entry **vfep)
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veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name,
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int flag, int lockstate, struct veriexec_file_entry **vfep)
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{
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struct veriexec_file_entry *vfe;
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int error;
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#define VFE_NEEDS_EVAL(vfe) ((vfe->status == FINGERPRINT_NOTEVAL) || \
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(vfe->type & VERIEXEC_UNTRUSTED))
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if (vp->v_type != VREG)
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return (0);
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if (lockstate == VERIEXEC_UNLOCKED)
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rw_enter(&veriexec_op_lock, RW_READER);
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/* Lookup veriexec table entry, save pointer if requested. */
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vfe = veriexec_get(vp);
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if (vfep != NULL)
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@ -572,20 +598,35 @@ veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int fl
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if (vfe == NULL)
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goto out;
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/* Evaluate fingerprint if needed. */
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error = 0;
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if ((vfe->status == FINGERPRINT_NOTEVAL) ||
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(vfe->type & VERIEXEC_UNTRUSTED)) {
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/*
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* Grab the lock for the entry, if we need to do an evaluation
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* then the lock is a write lock, after we have the write
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* lock, check if we really need it - some other thread may
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* have already done the work for us.
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*/
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if (VFE_NEEDS_EVAL(vfe)) {
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rw_enter(&vfe->lock, RW_WRITER);
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if (!VFE_NEEDS_EVAL(vfe))
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rw_downgrade(&vfe->lock);
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} else
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rw_enter(&vfe->lock, RW_READER);
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/* Evaluate fingerprint if needed. */
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if (VFE_NEEDS_EVAL(vfe)) {
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u_char *digest;
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/* Calculate fingerprint for on-disk file. */
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digest = kmem_zalloc(vfe->ops->hash_len, KM_SLEEP);
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error = veriexec_fp_calc(l, vp, vfe, digest);
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error = veriexec_fp_calc(l, vp, lockstate, vfe, digest);
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if (error) {
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veriexec_file_report(vfe, "Fingerprint calculation error.",
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name, NULL, REPORT_ALWAYS);
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kmem_free(digest, vfe->ops->hash_len);
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rw_exit(&vfe->lock);
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rw_exit(&veriexec_op_lock);
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return (error);
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}
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@ -596,6 +637,7 @@ veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int fl
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vfe->status = FINGERPRINT_NOMATCH;
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kmem_free(digest, vfe->ops->hash_len);
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rw_downgrade(&vfe->lock);
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}
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if (!(vfe->type & flag)) {
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@ -603,9 +645,12 @@ veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int fl
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REPORT_ALWAYS|REPORT_ALARM);
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/* IPS mode: Enforce access type. */
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if (veriexec_strict >= VERIEXEC_IPS)
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if (veriexec_strict >= VERIEXEC_IPS) {
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rw_exit(&vfe->lock);
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rw_exit(&veriexec_op_lock);
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return (EPERM);
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}
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}
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out:
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/* No entry in the veriexec tables. */
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@ -613,6 +658,8 @@ veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int fl
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veriexec_file_report(NULL, "No entry.", name,
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l, REPORT_VERBOSE);
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if (lockstate == VERIEXEC_UNLOCKED)
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rw_exit(&veriexec_op_lock);
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/*
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* Lockdown mode: Deny access to non-monitored files.
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* IPS mode: Deny execution of non-monitored files.
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@ -628,6 +675,8 @@ veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int fl
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switch (vfe->status) {
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case FINGERPRINT_NOTEVAL:
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/* Should not happen. */
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rw_exit(&vfe->lock);
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rw_exit(&veriexec_op_lock);
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veriexec_file_report(vfe, "Not-evaluated status "
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"post evaluation; inconsistency detected.", name,
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NULL, REPORT_ALWAYS|REPORT_PANIC);
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@ -647,17 +696,23 @@ veriexec_file_verify(struct lwp *l, struct vnode *vp, const u_char *name, int fl
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NULL, REPORT_ALWAYS|REPORT_ALARM);
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/* IDS mode: Deny access on fingerprint mismatch. */
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if (veriexec_strict >= VERIEXEC_IDS)
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if (veriexec_strict >= VERIEXEC_IDS) {
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rw_exit(&vfe->lock);
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error = EPERM;
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}
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break;
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default:
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/* Should never happen. */
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rw_exit(&vfe->lock);
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rw_exit(&veriexec_op_lock);
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veriexec_file_report(vfe, "Invalid status "
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"post evaluation.", name, NULL, REPORT_ALWAYS|REPORT_PANIC);
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}
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if (lockstate == VERIEXEC_UNLOCKED)
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rw_exit(&veriexec_op_lock);
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return (error);
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}
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@ -671,15 +726,14 @@ veriexec_verify(struct lwp *l, struct vnode *vp, const u_char *name, int flag,
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if (veriexec_bypass)
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return 0;
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KERNEL_LOCK(1, NULL);
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r = veriexec_file_verify(l, vp, name, flag, VERIEXEC_UNLOCKED, &vfe);
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r = veriexec_file_verify(l, vp, name, flag, &vfe);
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if ((r == 0) && (vfe != NULL))
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rw_exit(&vfe->lock);
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if (found != NULL)
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*found = (vfe != NULL) ? true : false;
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KERNEL_UNLOCK_ONE(NULL);
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return (r);
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}
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@ -769,11 +823,12 @@ veriexec_removechk(struct lwp *l, struct vnode *vp, const char *pathbuf)
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if (veriexec_bypass)
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return 0;
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KERNEL_LOCK(1, NULL);
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rw_enter(&veriexec_op_lock, RW_READER);
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vfe = veriexec_get(vp);
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rw_exit(&veriexec_op_lock);
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if (vfe == NULL) {
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KERNEL_UNLOCK_ONE(NULL);
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/* Lockdown mode: Deny access to non-monitored files. */
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if (veriexec_strict >= VERIEXEC_LOCKDOWN)
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return (EPERM);
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@ -790,7 +845,7 @@ veriexec_removechk(struct lwp *l, struct vnode *vp, const char *pathbuf)
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else
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error = veriexec_file_delete(l, vp);
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KERNEL_UNLOCK_ONE(NULL);
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return error;
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}
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@ -810,14 +865,14 @@ veriexec_renamechk(struct lwp *l, struct vnode *fromvp, const char *fromname,
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if (veriexec_bypass)
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return 0;
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KERNEL_LOCK(1, NULL);
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rw_enter(&veriexec_op_lock, RW_READER);
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if (veriexec_strict >= VERIEXEC_LOCKDOWN) {
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log(LOG_ALERT, "Veriexec: Preventing rename of `%s' to "
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"`%s', uid=%u, pid=%u: Lockdown mode.\n", fromname, toname,
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kauth_cred_geteuid(l->l_cred), l->l_proc->p_pid);
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KERNEL_UNLOCK_ONE(NULL);
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rw_exit(&veriexec_op_lock);
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return (EPERM);
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}
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@ -835,7 +890,7 @@ veriexec_renamechk(struct lwp *l, struct vnode *fromvp, const char *fromname,
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l->l_proc->p_pid, (vfe != NULL && tvfe != NULL) ?
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"files" : "file");
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KERNEL_UNLOCK_ONE(NULL);
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rw_exit(&veriexec_op_lock);
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return (EPERM);
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}
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@ -847,25 +902,36 @@ veriexec_renamechk(struct lwp *l, struct vnode *fromvp, const char *fromname,
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* XXX: big enough for the new filename.
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*/
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if (vfe != NULL) {
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/* XXXX get write lock on vfe here? */
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VERIEXEC_RW_UPGRADE(&veriexec_op_lock);
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/* once we have the op lock in write mode
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* there should be no locks on any file
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* entries so we can destroy the object.
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*/
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kmem_free(vfe->filename, vfe->filename_len);
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vfe->filename = NULL;
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vfe->filename_len = 0;
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rw_downgrade(&veriexec_op_lock);
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}
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log(LOG_NOTICE, "Veriexec: %s file `%s' renamed to "
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"%s file `%s', uid=%u, pid=%u.\n", (vfe != NULL) ?
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"Monitored" : "Non-monitored", fromname, (tvfe != NULL) ?
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"monitored" : "non-monitored", toname,
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kauth_cred_geteuid(l->l_cred), l->l_proc->p_pid);
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rw_exit(&veriexec_op_lock);
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/*
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* Monitored file is overwritten. Remove the entry.
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*/
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if (tvfe != NULL)
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(void)veriexec_file_delete(l, tovp);
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log(LOG_NOTICE, "Veriexec: %s file `%s' renamed to "
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"%s file `%s', uid=%u, pid=%u.\n", (vfe != NULL) ?
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"Monitored" : "Non-monitored", fromname, (tvfe != NULL) ?
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"monitored" : "non-monitored", toname,
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kauth_cred_geteuid(l->l_cred), l->l_proc->p_pid);
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}
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KERNEL_UNLOCK_ONE(NULL);
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return (0);
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}
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@ -879,23 +945,33 @@ veriexec_file_free(struct veriexec_file_entry *vfe)
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kmem_free(vfe->page_fp, vfe->ops->hash_len);
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if (vfe->filename != NULL)
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kmem_free(vfe->filename, vfe->filename_len);
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rw_destroy(&vfe->lock);
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kmem_free(vfe, sizeof(*vfe));
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}
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}
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static void
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veriexec_file_purge(struct veriexec_file_entry *vfe)
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veriexec_file_purge(struct veriexec_file_entry *vfe, int have_lock)
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{
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if (vfe == NULL)
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return;
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if (have_lock == VERIEXEC_UNLOCKED)
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rw_enter(&vfe->lock, RW_WRITER);
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else
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VERIEXEC_RW_UPGRADE(&vfe->lock);
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vfe->status = FINGERPRINT_NOTEVAL;
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if (have_lock == VERIEXEC_UNLOCKED)
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rw_exit(&vfe->lock);
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else
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rw_downgrade(&vfe->lock);
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}
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static void
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veriexec_file_purge_cb(struct veriexec_file_entry *vfe, void *cookie)
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{
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veriexec_file_purge(vfe);
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veriexec_file_purge(vfe, VERIEXEC_UNLOCKED);
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}
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/*
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@ -905,7 +981,10 @@ veriexec_file_purge_cb(struct veriexec_file_entry *vfe, void *cookie)
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void
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veriexec_purge(struct vnode *vp)
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{
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veriexec_file_purge(veriexec_get(vp));
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rw_enter(&veriexec_op_lock, RW_READER);
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veriexec_file_purge(veriexec_get(vp), VERIEXEC_UNLOCKED);
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rw_exit(&veriexec_op_lock);
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}
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/*
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@ -1024,8 +1103,10 @@ veriexec_raw_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
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case VERIEXEC_IDS:
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result = KAUTH_RESULT_DEFER;
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rw_enter(&veriexec_op_lock, RW_WRITER);
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fileassoc_table_run(bvp->v_mount, veriexec_hook,
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(fileassoc_cb_t)veriexec_file_purge_cb, NULL);
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rw_exit(&veriexec_op_lock);
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break;
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case VERIEXEC_IPS:
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@ -1145,6 +1226,8 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
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memcpy(vfe->fp, prop_data_data_nocopy(prop_dictionary_get(dict, "fp")),
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vfe->ops->hash_len);
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rw_enter(&veriexec_op_lock, RW_WRITER);
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/*
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||||
* See if we already have an entry for this file. If we do, then
|
||||
* let the user know and silently pretend to succeed.
|
||||
|
|
@ -1169,7 +1252,7 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
|
|||
/* XXX Should this be EEXIST if fp_mismatch is true? */
|
||||
error = 0;
|
||||
|
||||
goto out;
|
||||
goto unlock_out;
|
||||
}
|
||||
|
||||
/* Continue entry initialization. */
|
||||
|
|
@ -1186,7 +1269,7 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
|
|||
|
||||
error = EINVAL;
|
||||
|
||||
goto out;
|
||||
goto unlock_out;
|
||||
}
|
||||
}
|
||||
if (!(vfe->type & (VERIEXEC_DIRECT | VERIEXEC_INDIRECT |
|
||||
|
|
@ -1205,6 +1288,7 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
|
|||
vfe->page_fp_status = PAGE_FP_NONE;
|
||||
vfe->npages = 0;
|
||||
vfe->last_page_size = 0;
|
||||
rw_init(&vfe->lock);
|
||||
|
||||
vte = veriexec_table_lookup(nid.ni_vp->v_mount);
|
||||
if (vte == NULL)
|
||||
|
|
@ -1214,7 +1298,7 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
|
|||
|
||||
error = fileassoc_add(nid.ni_vp, veriexec_hook, vfe);
|
||||
if (error)
|
||||
goto out;
|
||||
goto unlock_out;
|
||||
|
||||
vte->vte_count++;
|
||||
|
||||
|
|
@ -1224,7 +1308,8 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
|
|||
|
||||
digest = kmem_zalloc(vfe->ops->hash_len, KM_SLEEP);
|
||||
|
||||
error = veriexec_fp_calc(l, nid.ni_vp, vfe, digest);
|
||||
error = veriexec_fp_calc(l, nid.ni_vp, VERIEXEC_UNLOCKED,
|
||||
vfe, digest);
|
||||
if (error) {
|
||||
kmem_free(digest, vfe->ops->hash_len);
|
||||
goto out;
|
||||
|
|
@ -1241,6 +1326,9 @@ veriexec_file_add(struct lwp *l, prop_dictionary_t dict)
|
|||
veriexec_file_report(NULL, "New entry.", file, NULL, REPORT_DEBUG);
|
||||
veriexec_bypass = 0;
|
||||
|
||||
unlock_out:
|
||||
rw_exit(&veriexec_op_lock);
|
||||
|
||||
out:
|
||||
vrele(nid.ni_vp);
|
||||
if (error)
|
||||
|
|
@ -1272,7 +1360,9 @@ veriexec_file_delete(struct lwp *l, struct vnode *vp) {
|
|||
if (vte == NULL)
|
||||
return (ENOENT);
|
||||
|
||||
rw_enter(&veriexec_op_lock, RW_WRITER);
|
||||
error = fileassoc_clear(vp, veriexec_hook);
|
||||
rw_exit(&veriexec_op_lock);
|
||||
if (!error)
|
||||
vte->vte_count--;
|
||||
|
||||
|
|
@ -1301,12 +1391,19 @@ veriexec_convert(struct vnode *vp, prop_dictionary_t rdict)
|
|||
{
|
||||
struct veriexec_file_entry *vfe;
|
||||
|
||||
vfe = veriexec_get(vp);
|
||||
if (vfe == NULL)
|
||||
return (ENOENT);
|
||||
rw_enter(&veriexec_op_lock, RW_READER);
|
||||
|
||||
vfe = veriexec_get(vp);
|
||||
if (vfe == NULL) {
|
||||
rw_exit(&veriexec_op_lock);
|
||||
return (ENOENT);
|
||||
}
|
||||
|
||||
rw_enter(&vfe->lock, RW_READER);
|
||||
veriexec_file_convert(vfe, rdict);
|
||||
|
||||
rw_exit(&vfe->lock);
|
||||
rw_exit(&veriexec_op_lock);
|
||||
return (0);
|
||||
}
|
||||
|
||||
|
|
@ -1318,7 +1415,7 @@ veriexec_unmountchk(struct mount *mp)
|
|||
if (veriexec_bypass || doing_shutdown)
|
||||
return (0);
|
||||
|
||||
KERNEL_LOCK(1, NULL);
|
||||
rw_enter(&veriexec_op_lock, RW_READER);
|
||||
|
||||
switch (veriexec_strict) {
|
||||
case VERIEXEC_LEARNING:
|
||||
|
|
@ -1357,7 +1454,7 @@ veriexec_unmountchk(struct mount *mp)
|
|||
break;
|
||||
}
|
||||
|
||||
KERNEL_UNLOCK_ONE(NULL);
|
||||
rw_exit(&veriexec_op_lock);
|
||||
return (error);
|
||||
}
|
||||
|
||||
|
|
@ -1370,8 +1467,6 @@ veriexec_openchk(struct lwp *l, struct vnode *vp, const char *path, int fmode)
|
|||
if (veriexec_bypass)
|
||||
return 0;
|
||||
|
||||
KERNEL_LOCK(1, NULL);
|
||||
|
||||
if (vp == NULL) {
|
||||
/* If no creation requested, let this fail normally. */
|
||||
if (!(fmode & O_CREAT))
|
||||
|
|
@ -1387,9 +1482,14 @@ veriexec_openchk(struct lwp *l, struct vnode *vp, const char *path, int fmode)
|
|||
goto out;
|
||||
}
|
||||
|
||||
error = veriexec_file_verify(l, vp, path, VERIEXEC_FILE, &vfe);
|
||||
if (error)
|
||||
rw_enter(&veriexec_op_lock, RW_READER);
|
||||
error = veriexec_file_verify(l, vp, path, VERIEXEC_FILE,
|
||||
VERIEXEC_LOCKED, &vfe);
|
||||
|
||||
if (error) {
|
||||
rw_exit(&veriexec_op_lock);
|
||||
goto out;
|
||||
}
|
||||
|
||||
if ((vfe != NULL) && ((fmode & FWRITE) || (fmode & O_TRUNC))) {
|
||||
veriexec_file_report(vfe, "Write access request.", path, l,
|
||||
|
|
@ -1399,11 +1499,14 @@ veriexec_openchk(struct lwp *l, struct vnode *vp, const char *path, int fmode)
|
|||
if (veriexec_strict >= VERIEXEC_IPS)
|
||||
error = EPERM;
|
||||
else
|
||||
veriexec_file_purge(vfe);
|
||||
veriexec_file_purge(vfe, VERIEXEC_LOCKED);
|
||||
}
|
||||
|
||||
if (vfe != NULL)
|
||||
rw_exit(&vfe->lock);
|
||||
|
||||
rw_exit(&veriexec_op_lock);
|
||||
out:
|
||||
KERNEL_UNLOCK_ONE(NULL);
|
||||
return (error);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue