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@ -1,6 +1,8 @@
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/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* The Regents of the University of California.
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* Copyright (c) 2005 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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@ -54,6 +56,25 @@ __FBSDID("$FreeBSD$");
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#include <sys/syslog.h>
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#include <sys/sysproto.h>
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/*
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* The ktrace facility allows the tracing of certain key events in user space
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* processes, such as system calls, signal delivery, context switches, and
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* user generated events using utrace(2). It works by streaming event
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* records and data to a vnode associated with the process using the
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* ktrace(2) system call. In general, records can be written directly from
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* the context that generates the event. One important exception to this is
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* during a context switch, where sleeping is not permitted. To handle this
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* case, trace events are generated using in-kernel ktr_request records, and
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* then delivered to disk at a convenient moment -- either immediately, the
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* next traceable event, at system call return, or at process exit.
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*
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* When dealing with multiple threads or processes writing to the same event
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* log, ordering guarantees are weak: specifically, if an event has multiple
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* records (i.e., system call enter and return), they may be interlaced with
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* records from another event. Process and thread ID information is provided
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* in the record, and user applications can de-interlace events if required.
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*/
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static MALLOC_DEFINE(M_KTRACE, "KTRACE", "KTRACE");
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#ifdef KTRACE
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@ -65,8 +86,6 @@ static MALLOC_DEFINE(M_KTRACE, "KTRACE", "KTRACE");
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struct ktr_request {
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struct ktr_header ktr_header;
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void *ktr_buffer;
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struct ucred *ktr_cred;
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struct vnode *ktr_vp;
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union {
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struct ktr_syscall ktr_syscall;
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struct ktr_sysret ktr_sysret;
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@ -88,7 +107,6 @@ static int data_lengths[] = {
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0 /* KTR_USER */
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};
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static STAILQ_HEAD(, ktr_request) ktr_todo;
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static STAILQ_HEAD(, ktr_request) ktr_free;
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static SYSCTL_NODE(_kern, OID_AUTO, ktrace, CTLFLAG_RD, 0, "KTRACE options");
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@ -104,19 +122,48 @@ SYSCTL_UINT(_kern_ktrace, OID_AUTO, genio_size, CTLFLAG_RW, &ktr_geniosize,
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static int print_message = 1;
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struct mtx ktrace_mtx;
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static struct cv ktrace_cv;
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static struct sx ktrace_sx;
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static void ktrace_init(void *dummy);
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static int sysctl_kern_ktrace_request_pool(SYSCTL_HANDLER_ARGS);
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static u_int ktrace_resize_pool(u_int newsize);
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static struct ktr_request *ktr_getrequest(int type);
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static void ktr_submitrequest(struct ktr_request *req);
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static void ktr_submitrequest(struct thread *td, struct ktr_request *req);
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static void ktr_freerequest(struct ktr_request *req);
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static void ktr_loop(void *dummy);
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static void ktr_writerequest(struct ktr_request *req);
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static void ktr_writerequest(struct thread *td, struct ktr_request *req);
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static int ktrcanset(struct thread *,struct proc *);
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static int ktrsetchildren(struct thread *,struct proc *,int,int,struct vnode *);
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static int ktrops(struct thread *,struct proc *,int,int,struct vnode *);
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/*
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* ktrace itself generates events, such as context switches, which we do not
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* wish to trace. Maintain a flag, TDP_INKTRACE, on each thread to determine
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* whether or not it is in a region where tracing of events should be
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* suppressed.
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*/
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static void
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ktrace_enter(struct thread *td)
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{
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KASSERT(!(td->td_pflags & TDP_INKTRACE), ("ktrace_enter: flag set"));
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td->td_pflags |= TDP_INKTRACE;
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}
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static void
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ktrace_exit(struct thread *td)
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{
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KASSERT(td->td_pflags & TDP_INKTRACE, ("ktrace_exit: flag not set"));
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td->td_pflags &= ~TDP_INKTRACE;
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}
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static void
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ktrace_assert(struct thread *td)
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{
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KASSERT(td->td_pflags & TDP_INKTRACE, ("ktrace_assert: flag not set"));
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}
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static void
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ktrace_init(void *dummy)
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{
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@ -124,14 +171,13 @@ ktrace_init(void *dummy)
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int i;
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mtx_init(&ktrace_mtx, "ktrace", NULL, MTX_DEF | MTX_QUIET);
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sx_init(&ktrace_sx, "ktrace_sx");
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cv_init(&ktrace_cv, "ktrace");
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STAILQ_INIT(&ktr_todo);
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STAILQ_INIT(&ktr_free);
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for (i = 0; i < ktr_requestpool; i++) {
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req = malloc(sizeof(struct ktr_request), M_KTRACE, M_WAITOK);
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STAILQ_INSERT_HEAD(&ktr_free, req, ktr_list);
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}
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kthread_create(ktr_loop, NULL, NULL, RFHIGHPID, 0, "ktrace");
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}
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SYSINIT(ktrace_init, SI_SUB_KTRACE, SI_ORDER_ANY, ktrace_init, NULL);
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@ -154,12 +200,12 @@ sysctl_kern_ktrace_request_pool(SYSCTL_HANDLER_ARGS)
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if (error)
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return (error);
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td = curthread;
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td->td_pflags |= TDP_INKTRACE;
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ktrace_enter(td);
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mtx_lock(&ktrace_mtx);
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oldsize = ktr_requestpool;
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newsize = ktrace_resize_pool(wantsize);
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mtx_unlock(&ktrace_mtx);
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td->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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error = SYSCTL_OUT(req, &oldsize, sizeof(u_int));
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if (error)
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return (error);
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@ -214,27 +260,21 @@ ktr_getrequest(int type)
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struct proc *p = td->td_proc;
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int pm;
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td->td_pflags |= TDP_INKTRACE;
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mtx_lock(&ktrace_mtx);
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ktrace_enter(td); /* XXX: In caller instead? */
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if (!KTRCHECK(td, type)) {
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mtx_unlock(&ktrace_mtx);
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td->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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return (NULL);
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}
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mtx_lock(&ktrace_mtx);
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req = STAILQ_FIRST(&ktr_free);
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if (req != NULL) {
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STAILQ_REMOVE_HEAD(&ktr_free, ktr_list);
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mtx_unlock(&ktrace_mtx);
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req->ktr_header.ktr_type = type;
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if (p->p_traceflag & KTRFAC_DROP) {
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req->ktr_header.ktr_type |= KTR_DROP;
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p->p_traceflag &= ~KTRFAC_DROP;
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}
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KASSERT(p->p_tracevp != NULL, ("ktrace: no trace vnode"));
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KASSERT(p->p_tracecred != NULL, ("ktrace: no trace cred"));
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req->ktr_vp = p->p_tracevp;
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VREF(p->p_tracevp);
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req->ktr_cred = crhold(p->p_tracecred);
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mtx_unlock(&ktrace_mtx);
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microtime(&req->ktr_header.ktr_time);
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req->ktr_header.ktr_pid = p->p_pid;
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req->ktr_header.ktr_tid = td->td_tid;
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@ -248,32 +288,82 @@ ktr_getrequest(int type)
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mtx_unlock(&ktrace_mtx);
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if (pm)
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printf("Out of ktrace request objects.\n");
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td->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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}
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return (req);
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}
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/*
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* Some trace generation environments don't permit direct access to VFS,
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* such as during a context switch where sleeping is not allowed. Under these
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* circumstances, queue a request to the thread to be written asynchronously
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* later.
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*/
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static void
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ktr_submitrequest(struct ktr_request *req)
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ktr_enqueuerequest(struct thread *td, struct ktr_request *req)
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{
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mtx_lock(&ktrace_mtx);
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STAILQ_INSERT_TAIL(&ktr_todo, req, ktr_list);
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cv_signal(&ktrace_cv);
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STAILQ_INSERT_TAIL(&td->td_proc->p_ktr, req, ktr_list);
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mtx_unlock(&ktrace_mtx);
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curthread->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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}
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/*
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* Drain any pending ktrace records from the per-thread queue to disk. This
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* is used both internally before committing other records, and also on
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* system call return. We drain all the ones we can find at the time when
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* drain is requested, but don't keep draining after that as those events
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* may me approximately "after" the current event.
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*/
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static void
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ktr_drain(struct thread *td)
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{
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struct ktr_request *queued_req;
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STAILQ_HEAD(, ktr_request) local_queue;
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ktrace_assert(td);
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sx_assert(&ktrace_sx, SX_XLOCKED);
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STAILQ_INIT(&local_queue); /* XXXRW: needed? */
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if (!STAILQ_EMPTY(&td->td_proc->p_ktr)) {
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mtx_lock(&ktrace_mtx);
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STAILQ_CONCAT(&local_queue, &td->td_proc->p_ktr);
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mtx_unlock(&ktrace_mtx);
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while ((queued_req = STAILQ_FIRST(&local_queue))) {
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STAILQ_REMOVE_HEAD(&local_queue, ktr_list);
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ktr_writerequest(td, queued_req);
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ktr_freerequest(queued_req);
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}
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}
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}
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/*
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* Submit a trace record for immediate commit to disk -- to be used only
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* where entering VFS is OK. First drain any pending records that may have
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* been cached in the thread.
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*/
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static void
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ktr_submitrequest(struct thread *td, struct ktr_request *req)
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{
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ktrace_assert(td);
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sx_xlock(&ktrace_sx);
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ktr_drain(td);
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ktr_writerequest(td, req);
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ktr_freerequest(req);
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sx_xunlock(&ktrace_sx);
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ktrace_exit(td);
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}
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static void
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ktr_freerequest(struct ktr_request *req)
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{
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crfree(req->ktr_cred);
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if (req->ktr_vp != NULL) {
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mtx_lock(&Giant);
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vrele(req->ktr_vp);
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mtx_unlock(&Giant);
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}
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if (req->ktr_buffer != NULL)
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free(req->ktr_buffer, M_KTRACE);
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mtx_lock(&ktrace_mtx);
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@ -281,38 +371,6 @@ ktr_freerequest(struct ktr_request *req)
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mtx_unlock(&ktrace_mtx);
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}
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static void
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ktr_loop(void *dummy)
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{
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struct ktr_request *req;
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struct thread *td;
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struct ucred *cred;
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/* Only cache these values once. */
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td = curthread;
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cred = td->td_ucred;
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for (;;) {
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mtx_lock(&ktrace_mtx);
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while (STAILQ_EMPTY(&ktr_todo))
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cv_wait(&ktrace_cv, &ktrace_mtx);
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req = STAILQ_FIRST(&ktr_todo);
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STAILQ_REMOVE_HEAD(&ktr_todo, ktr_list);
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KASSERT(req != NULL, ("got a NULL request"));
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mtx_unlock(&ktrace_mtx);
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/*
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* It is not enough just to pass the cached cred
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* to the VOP's in ktr_writerequest(). Some VFS
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* operations use curthread->td_ucred, so we need
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* to modify our thread's credentials as well.
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* Evil.
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*/
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td->td_ucred = req->ktr_cred;
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ktr_writerequest(req);
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td->td_ucred = cred;
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ktr_freerequest(req);
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}
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}
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/*
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* MPSAFE
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*/
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@ -344,7 +402,7 @@ ktrsyscall(code, narg, args)
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req->ktr_header.ktr_len = buflen;
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req->ktr_buffer = buf;
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}
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ktr_submitrequest(req);
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ktr_submitrequest(curthread, req);
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}
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/*
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@ -365,7 +423,36 @@ ktrsysret(code, error, retval)
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ktp->ktr_code = code;
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ktp->ktr_error = error;
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ktp->ktr_retval = retval; /* what about val2 ? */
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ktr_submitrequest(req);
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ktr_submitrequest(curthread, req);
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}
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/*
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* When a process exits, drain per-process asynchronous trace records.
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*/
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void
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ktrprocexit(struct thread *td)
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{
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ktrace_enter(td);
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sx_xlock(&ktrace_sx);
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ktr_drain(td);
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sx_xunlock(&ktrace_sx);
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ktrace_exit(td);
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}
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/*
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* When a thread returns, drain any asynchronous records generated by the
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* system call.
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*/
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void
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ktruserret(struct thread *td)
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{
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ktrace_enter(td);
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sx_xlock(&ktrace_sx);
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ktr_drain(td);
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sx_xunlock(&ktrace_sx);
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ktrace_exit(td);
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}
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void
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@ -391,7 +478,7 @@ ktrnamei(path)
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req->ktr_header.ktr_len = namelen;
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req->ktr_buffer = buf;
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}
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ktr_submitrequest(req);
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ktr_submitrequest(curthread, req);
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}
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/*
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@ -439,7 +526,7 @@ ktrgenio(fd, rw, uio, error)
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ktg->ktr_rw = rw;
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req->ktr_header.ktr_len = datalen;
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req->ktr_buffer = buf;
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ktr_submitrequest(req);
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ktr_submitrequest(curthread, req);
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}
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void
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@ -460,7 +547,7 @@ ktrpsig(sig, action, mask, code)
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kp->action = action;
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kp->mask = *mask;
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kp->code = code;
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ktr_submitrequest(req);
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ktr_enqueuerequest(curthread, req);
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}
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void
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@ -476,7 +563,7 @@ ktrcsw(out, user)
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kc = &req->ktr_data.ktr_csw;
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kc->out = out;
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kc->user = user;
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ktr_submitrequest(req);
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ktr_enqueuerequest(curthread, req);
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}
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#endif /* KTRACE */
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@ -519,7 +606,7 @@ ktrace(td, uap)
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if (ops != KTROP_CLEARFILE && facs == 0)
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return (EINVAL);
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td->td_pflags |= TDP_INKTRACE;
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ktrace_enter(td);
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if (ops != KTROP_CLEAR) {
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/*
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* an operation which requires a file argument.
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@ -530,7 +617,7 @@ ktrace(td, uap)
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error = vn_open(&nd, &flags, 0, -1);
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if (error) {
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mtx_unlock(&Giant);
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td->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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return (error);
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}
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NDFREE(&nd, NDF_ONLY_PNBUF);
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@ -539,7 +626,7 @@ ktrace(td, uap)
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if (vp->v_type != VREG) {
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(void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
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mtx_unlock(&Giant);
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td->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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return (EACCES);
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}
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mtx_unlock(&Giant);
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@ -647,7 +734,7 @@ ktrace(td, uap)
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(void) vn_close(vp, FWRITE, td->td_ucred, td);
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mtx_unlock(&Giant);
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}
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td->td_pflags &= ~TDP_INKTRACE;
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ktrace_exit(td);
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return (error);
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#else /* !KTRACE */
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return (ENOSYS);
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@ -688,7 +775,7 @@ utrace(td, uap)
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}
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req->ktr_buffer = cp;
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req->ktr_header.ktr_len = uap->len;
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ktr_submitrequest(req);
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ktr_submitrequest(td, req);
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return (0);
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#else /* !KTRACE */
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return (ENOSYS);
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@ -787,12 +874,11 @@ ktrsetchildren(td, top, ops, facs, vp)
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}
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static void
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ktr_writerequest(struct ktr_request *req)
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ktr_writerequest(struct thread *td, struct ktr_request *req)
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{
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struct ktr_header *kth;
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struct vnode *vp;
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struct proc *p;
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struct thread *td;
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struct ucred *cred;
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struct uio auio;
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struct iovec aiov[3];
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@ -800,18 +886,36 @@ ktr_writerequest(struct ktr_request *req)
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int datalen, buflen, vrele_count;
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int error;
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vp = req->ktr_vp;
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/*
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* We hold the vnode and credential for use in I/O in case ktrace is
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* disabled on the process as we write out the request.
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*
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* XXXRW: This is not ideal: we could end up performing a write after
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* the vnode has been closed.
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*/
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mtx_lock(&ktrace_mtx);
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vp = td->td_proc->p_tracevp;
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if (vp != NULL)
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VREF(vp);
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cred = td->td_proc->p_tracecred;
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if (cred != NULL)
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crhold(cred);
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mtx_unlock(&ktrace_mtx);
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/*
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* If vp is NULL, the vp has been cleared out from under this
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* request, so just drop it.
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* request, so just drop it. Make sure the credential and vnode are
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* in sync: we should have both or neither.
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*/
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if (vp == NULL)
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if (vp == NULL) {
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KASSERT(cred == NULL, ("ktr_writerequest: cred != NULL"));
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return;
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}
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KASSERT(cred != NULL, ("ktr_writerequest: cred == NULL"));
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kth = &req->ktr_header;
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datalen = data_lengths[(u_short)kth->ktr_type & ~KTR_DROP];
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buflen = kth->ktr_len;
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cred = req->ktr_cred;
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td = curthread;
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auio.uio_iov = &aiov[0];
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auio.uio_offset = 0;
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auio.uio_segflg = UIO_SYSSPACE;
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@ -835,6 +939,7 @@ ktr_writerequest(struct ktr_request *req)
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auio.uio_resid += buflen;
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auio.uio_iovcnt++;
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}
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mtx_lock(&Giant);
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vn_start_write(vp, &mp, V_WAIT);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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@ -884,17 +989,12 @@ ktr_writerequest(struct ktr_request *req)
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}
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}
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sx_sunlock(&allproc_lock);
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/*
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* Second, clear this vnode from any pending requests.
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* We can't clear any pending requests in threads that have cached
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* them but not yet committed them, as those are per-thread. The
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* thread will have to clear it itself on system call return.
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*/
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mtx_lock(&ktrace_mtx);
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STAILQ_FOREACH(req, &ktr_todo, ktr_list) {
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if (req->ktr_vp == vp) {
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req->ktr_vp = NULL;
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vrele_count++;
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}
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}
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mtx_unlock(&ktrace_mtx);
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mtx_lock(&Giant);
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while (vrele_count-- > 0)
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vrele(vp);
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