#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#if KTRACE
#include <sys/ktrace.h>
#endif
#include <sys/malloc.h>
#include <sys/syslog.h>
#if KTRACE
static struct ktr_header *ktrgetheader __P((int type));
static void ktrwrite __P((struct vnode *, struct ktr_header *,
struct uio *, int));
static int ktrcanset __P((struct proc *,struct proc *));
static int ktrsetchildren __P((struct proc *,struct proc *,
int, int, struct vnode *));
static int ktrops __P((struct proc *,struct proc *,int,int,struct vnode *));
static struct ktr_header *
ktrgetheader(type)
int type;
{
register struct ktr_header *kth;
struct proc *p = current_proc();
MALLOC(kth, struct ktr_header *, sizeof (struct ktr_header),
M_KTRACE, M_WAITOK);
kth->ktr_type = type;
microtime(&kth->ktr_time);
kth->ktr_pid = p->p_pid;
bcopy(p->p_comm, kth->ktr_comm, MAXCOMLEN);
return (kth);
}
#endif
void
ktrsyscall(p, code, narg, args, funnel_type)
struct proc *p;
int code, narg;
register_t args[];
int funnel_type;
{
#if KTRACE
struct vnode *vp;
struct ktr_header *kth;
struct ktr_syscall *ktp;
register int len;
register_t *argp;
int i;
if (!KTRPOINT(p, KTR_SYSCALL))
return;
vp = p->p_tracep;
len = __offsetof(struct ktr_syscall, ktr_args) +
(narg * sizeof(register_t));
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_SYSCALL);
MALLOC(ktp, struct ktr_syscall *, len, M_KTRACE, M_WAITOK);
ktp->ktr_code = code;
ktp->ktr_narg = narg;
argp = &ktp->ktr_args[0];
for (i = 0; i < narg; i++)
*argp++ = args[i];
kth->ktr_buf = (caddr_t)ktp;
kth->ktr_len = len;
ktrwrite(vp, kth, NULL, funnel_type);
FREE(ktp, M_KTRACE);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
#else
return;
#endif
}
void
ktrsysret(p, code, error, retval, funnel_type)
struct proc *p;
int code, error;
register_t retval;
int funnel_type;
{
#if KTRACE
struct vnode *vp;
struct ktr_header *kth;
struct ktr_sysret ktp;
if (!KTRPOINT(p, KTR_SYSRET))
return;
vp = p->p_tracep;
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_SYSRET);
ktp.ktr_code = code;
ktp.ktr_error = error;
ktp.ktr_retval = retval;
kth->ktr_buf = (caddr_t)&ktp;
kth->ktr_len = sizeof(struct ktr_sysret);
ktrwrite(vp, kth, NULL, funnel_type);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
#else
return;
#endif
}
#if KTRACE
void
ktrnamei(vp, path)
struct vnode *vp;
char *path;
{
struct ktr_header *kth;
struct proc *p = current_proc();
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_NAMEI);
kth->ktr_len = strlen(path);
kth->ktr_buf = path;
ktrwrite(vp, kth, NULL, KERNEL_FUNNEL);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
void
ktrgenio(vp, fd, rw, uio, error, funnel_type)
struct vnode *vp;
int fd;
enum uio_rw rw;
struct uio *uio;
int error;
int funnel_type;
{
struct ktr_header *kth;
struct ktr_genio ktg;
struct proc *p = current_proc();
if (error)
return;
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_GENIO);
ktg.ktr_fd = fd;
ktg.ktr_rw = rw;
kth->ktr_buf = (caddr_t)&ktg;
kth->ktr_len = sizeof(struct ktr_genio);
uio->uio_offset = 0;
uio->uio_rw = UIO_WRITE;
ktrwrite(vp, kth, uio, funnel_type);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
void
ktrpsig(vp, sig, action, mask, code, funnel_type)
struct vnode *vp;
int sig;
sig_t action;
sigset_t *mask;
int code;
int funnel_type;
{
struct ktr_header *kth;
struct ktr_psig kp;
struct proc *p = current_proc();
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_PSIG);
kp.signo = (char)sig;
kp.action = action;
kp.mask = *mask;
kp.code = code;
kth->ktr_buf = (caddr_t)&kp;
kth->ktr_len = sizeof (struct ktr_psig);
ktrwrite(vp, kth, NULL, funnel_type);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
void
ktrcsw(vp, out, user, funnel_type)
struct vnode *vp;
int out, user;
int funnel_type;
{
struct ktr_header *kth;
struct ktr_csw kc;
struct proc *p = current_proc();
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_CSW);
kc.out = out;
kc.user = user;
kth->ktr_buf = (caddr_t)&kc;
kth->ktr_len = sizeof (struct ktr_csw);
ktrwrite(vp, kth, NULL, funnel_type);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
#endif
struct ktrace_args {
char *fname;
int ops;
int facs;
int pid;
};
int
ktrace(curp, uap, retval)
struct proc *curp;
register struct ktrace_args *uap;
register_t *retval;
{
#if KTRACE
register struct vnode *vp = NULL;
register struct proc *p;
struct pgrp *pg;
int facs = uap->facs & ~KTRFAC_ROOT;
int ops = KTROP(uap->ops);
int descend = uap->ops & KTRFLAG_DESCEND;
int ret = 0;
int error = 0;
struct nameidata nd;
curp->p_traceflag |= KTRFAC_ACTIVE;
if (ops != KTROP_CLEAR) {
NDINIT(&nd, LOOKUP, (NOFOLLOW|LOCKLEAF), UIO_USERSPACE, uap->fname, curp);
error = vn_open(&nd, FREAD|FWRITE|O_NOFOLLOW, 0);
if (error) {
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (error);
}
vp = nd.ni_vp;
VOP_UNLOCK(vp, 0, curp);
if (vp->v_type != VREG) {
(void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (EACCES);
}
}
if (ops == KTROP_CLEARFILE) {
LIST_FOREACH(p, &allproc, p_list) {
if (p->p_tracep == vp) {
if (ktrcanset(curp, p)) {
struct vnode *tvp = p->p_tracep;
p->p_traceflag = 0;
if (tvp != NULL) {
p->p_tracep = NULL;
vrele(tvp);
}
} else
error = EPERM;
}
}
goto done;
}
if (!facs) {
error = EINVAL;
goto done;
}
if (uap->pid < 0) {
pg = pgfind(-uap->pid);
if (pg == NULL) {
error = ESRCH;
goto done;
}
LIST_FOREACH(p, &pg->pg_members, p_pglist)
if (descend)
ret |= ktrsetchildren(curp, p, ops, facs, vp);
else
ret |= ktrops(curp, p, ops, facs, vp);
} else {
p = pfind(uap->pid);
if (p == NULL) {
error = ESRCH;
goto done;
}
if (descend)
ret |= ktrsetchildren(curp, p, ops, facs, vp);
else
ret |= ktrops(curp, p, ops, facs, vp);
}
if (!ret)
error = EPERM;
done:
if (vp != NULL)
(void) vn_close(vp, FWRITE, curp->p_ucred, curp);
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (error);
#else
return ENOSYS;
#endif
}
struct utrace_args {
const void * addr;
size_t len;
};
int
utrace(curp, uap, retval)
struct proc *curp;
register struct utrace_args *uap;
register_t *retval;
{
#if KTRACE
struct ktr_header *kth;
struct proc *p = current_proc();
register caddr_t cp;
if (!KTRPOINT(p, KTR_USER))
return (0);
if (uap->len > KTR_USER_MAXLEN)
return (EINVAL);
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_USER);
MALLOC(cp, caddr_t, uap->len, M_KTRACE, M_WAITOK);
if (!copyin(uap->addr, cp, uap->len)) {
kth->ktr_buf = cp;
kth->ktr_len = uap->len;
ktrwrite(p->p_tracep, kth, NULL, KERNEL_FUNNEL);
}
FREE(kth, M_KTRACE);
FREE(cp, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
return (0);
#else
return (ENOSYS);
#endif
}
#if KTRACE
static int
ktrops(curp, p, ops, facs, vp)
struct proc *p, *curp;
int ops, facs;
struct vnode *vp;
{
struct vnode *tvp;
if (!ktrcanset(curp, p))
return (0);
if (ops == KTROP_SET) {
if (p->p_tracep != vp) {
tvp = p->p_tracep;
VREF(vp);
p->p_tracep = vp;
if (tvp != NULL)
vrele(tvp);
}
p->p_traceflag |= facs;
if (curp->p_ucred->cr_uid == 0)
p->p_traceflag |= KTRFAC_ROOT;
} else {
if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
tvp = p->p_tracep;
p->p_traceflag = 0;
if (tvp != NULL) {
p->p_tracep = NULL;
vrele(tvp);
}
}
}
return (1);
}
static int
ktrsetchildren(curp, top, ops, facs, vp)
struct proc *curp, *top;
int ops, facs;
struct vnode *vp;
{
register struct proc *p;
register int ret = 0;
p = top;
for (;;) {
ret |= ktrops(curp, p, ops, facs, vp);
if (!LIST_EMPTY(&p->p_children))
p = LIST_FIRST(&p->p_children);
else for (;;) {
if (p == top)
return (ret);
if (LIST_NEXT(p, p_sibling)) {
p = LIST_NEXT(p, p_sibling);
break;
}
p = p->p_pptr;
}
}
}
static void
ktrwrite(vp, kth, uio, funnel_type)
struct vnode *vp;
register struct ktr_header *kth;
struct uio *uio;
{
struct uio auio;
struct iovec aiov[2];
register struct proc *p = current_proc();
int error;
if (vp == NULL)
return;
if (funnel_type == -1) {
funnel_t *f = thread_funnel_get();
if(f == THR_FUNNEL_NULL)
funnel_type = NO_FUNNEL;
else if (f == (funnel_t *)network_flock)
funnel_type = NETWORK_FUNNEL;
else if (f == (funnel_t *)kernel_flock)
funnel_type = KERNEL_FUNNEL;
}
switch (funnel_type) {
case KERNEL_FUNNEL:
break;
case NETWORK_FUNNEL:
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
break;
case NO_FUNNEL:
(void) thread_funnel_set(kernel_flock, TRUE);
break;
default:
panic("Invalid funnel (%)", funnel_type);
}
auio.uio_iov = &aiov[0];
auio.uio_offset = 0;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_WRITE;
aiov[0].iov_base = (caddr_t)kth;
aiov[0].iov_len = sizeof(struct ktr_header);
auio.uio_resid = sizeof(struct ktr_header);
auio.uio_iovcnt = 1;
auio.uio_procp = current_proc();
if (kth->ktr_len > 0) {
auio.uio_iovcnt++;
aiov[1].iov_base = kth->ktr_buf;
aiov[1].iov_len = kth->ktr_len;
auio.uio_resid += kth->ktr_len;
if (uio != NULL)
kth->ktr_len += uio->uio_resid;
}
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (error)
goto bad;
(void)VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
error = VOP_WRITE(vp, &auio, IO_UNIT | IO_APPEND, p->p_ucred);
if (error == 0 && uio != NULL) {
(void)VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
error = VOP_WRITE(vp, uio, IO_UNIT | IO_APPEND, p->p_ucred);
}
VOP_UNLOCK(vp, 0, p);
if (!error) {
switch (funnel_type) {
case KERNEL_FUNNEL:
break;
case NETWORK_FUNNEL:
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
break;
case NO_FUNNEL:
(void) thread_funnel_set(kernel_flock, FALSE);
break;
default:
panic("Invalid funnel (%)", funnel_type);
}
return;
}
bad:
log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
error);
LIST_FOREACH(p, &allproc, p_list) {
if (p->p_tracep == vp) {
p->p_tracep = NULL;
p->p_traceflag = 0;
vrele(vp);
}
}
switch (funnel_type) {
case KERNEL_FUNNEL:
break;
case NETWORK_FUNNEL:
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
break;
case NO_FUNNEL:
(void) thread_funnel_set(kernel_flock, FALSE);
break;
default:
panic("Invalid funnel (%)", funnel_type);
}
}
static int
ktrcanset(callp, targetp)
struct proc *callp, *targetp;
{
register struct pcred *caller = callp->p_cred;
register struct pcred *target = targetp->p_cred;
if (!PRISON_CHECK(callp, targetp))
return (0);
if ((caller->pc_ucred->cr_uid == target->p_ruid &&
target->p_ruid == target->p_svuid &&
caller->p_rgid == target->p_rgid &&
target->p_rgid == target->p_svgid &&
(targetp->p_traceflag & KTRFAC_ROOT) == 0) ||
caller->pc_ucred->cr_uid == 0)
return (1);
return (0);
}
#endif