Introduce preliminary support of the show description of the ABI of
traced process by adding two new events which records value of process sv_flags to the trace file at process creation/execing/exiting time. MFC after: 1 Month.
This commit is contained in:
parent
b4c20e5e37
commit
7705d4b24a
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=219042
@ -899,6 +899,12 @@ do_execve(td, args, mac_p)
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exit1(td, W_EXITCODE(0, SIGABRT));
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/* NOT REACHED */
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}
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#ifdef KTRACE
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if (error == 0)
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ktrprocctor(p);
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#endif
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return (error);
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}
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@ -557,10 +557,6 @@ do_fork(struct thread *td, int flags, struct proc *p2, struct thread *td2,
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callout_init(&p2->p_itcallout, CALLOUT_MPSAFE);
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#ifdef KTRACE
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ktrprocfork(p1, p2);
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#endif
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/*
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* If PF_FORK is set, the child process inherits the
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* procfs ioctl flags from its parent.
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@ -596,6 +592,10 @@ do_fork(struct thread *td, int flags, struct proc *p2, struct thread *td2,
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p2->p_acflag = AFORK;
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PROC_UNLOCK(p2);
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#ifdef KTRACE
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ktrprocfork(p1, p2);
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#endif
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/*
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* Finish creating the child process. It will return via a different
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* execution path later. (ie: directly into user mode)
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@ -55,6 +55,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/ktrace.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/syslog.h>
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#include <sys/sysproto.h>
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@ -93,6 +94,7 @@ struct ktr_request {
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struct ktr_header ktr_header;
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void *ktr_buffer;
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union {
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struct ktr_proc_ctor ktr_proc_ctor;
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struct ktr_syscall ktr_syscall;
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struct ktr_sysret ktr_sysret;
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struct ktr_genio ktr_genio;
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@ -113,6 +115,8 @@ static int data_lengths[] = {
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0, /* KTR_USER */
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0, /* KTR_STRUCT */
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0, /* KTR_SYSCTL */
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sizeof(struct ktr_proc_ctor), /* KTR_PROCCTOR */
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0, /* KTR_PROCDTOR */
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};
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static STAILQ_HEAD(, ktr_request) ktr_free;
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@ -134,7 +138,9 @@ 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 oldsize, u_int newsize);
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static struct ktr_request *ktr_getrequest_ne(struct thread *, int type);
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static struct ktr_request *ktr_getrequest(int type);
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static void ktr_submitrequest_ne(struct thread *td, 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_freeproc(struct proc *p, struct ucred **uc,
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struct vnode **vp);
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@ -144,6 +150,7 @@ 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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static void ktrprocctor_ne(struct thread *, struct proc *p);
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/*
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* ktrace itself generates events, such as context switches, which we do not
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@ -265,18 +272,15 @@ CTASSERT(sizeof(((struct ktr_header *)NULL)->ktr_comm) ==
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(sizeof((struct thread *)NULL)->td_name));
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static struct ktr_request *
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ktr_getrequest(int type)
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ktr_getrequest_ne(struct thread *td, int type)
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{
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struct ktr_request *req;
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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int pm;
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ktrace_enter(td); /* XXX: In caller instead? */
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mtx_lock(&ktrace_mtx);
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if (!KTRCHECK(td, type)) {
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mtx_unlock(&ktrace_mtx);
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ktrace_exit(td);
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return (NULL);
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}
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req = STAILQ_FIRST(&ktr_free);
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@ -302,11 +306,24 @@ 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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ktrace_exit(td);
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}
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return (req);
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}
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static struct ktr_request *
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ktr_getrequest(int type)
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{
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struct thread *td = curthread;
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struct ktr_request *req;
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ktrace_enter(td);
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req = ktr_getrequest_ne(td, type);
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if (req == NULL)
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ktrace_exit(td);
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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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@ -360,7 +377,7 @@ ktr_drain(struct thread *td)
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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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ktr_submitrequest_ne(struct thread *td, struct ktr_request *req)
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{
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ktrace_assert(td);
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@ -370,7 +387,14 @@ ktr_submitrequest(struct thread *td, struct ktr_request *req)
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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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}
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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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ktr_submitrequest_ne(td, req);
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ktrace_exit(td);
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}
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@ -488,6 +512,7 @@ ktrprocexec(struct proc *p, struct ucred **uc, struct vnode **vp)
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void
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ktrprocexit(struct thread *td)
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{
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struct ktr_request *req;
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struct proc *p;
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struct ucred *cred;
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struct vnode *vp;
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@ -501,6 +526,9 @@ ktrprocexit(struct thread *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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req = ktr_getrequest_ne(td, KTR_PROCDTOR);
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if (req != NULL)
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ktr_submitrequest_ne(td, req);
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PROC_LOCK(p);
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mtx_lock(&ktrace_mtx);
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ktr_freeproc(p, &cred, &vp);
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@ -516,6 +544,37 @@ ktrprocexit(struct thread *td)
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ktrace_exit(td);
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}
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static void
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ktrprocctor_ne(struct thread *td, struct proc *p)
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{
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struct ktr_proc_ctor *ktp;
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struct ktr_request *req;
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struct thread *td2;
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ktrace_assert(td);
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td2 = FIRST_THREAD_IN_PROC(p);
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req = ktr_getrequest_ne(td2, KTR_PROCCTOR);
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if (req == NULL)
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return;
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ktp = &req->ktr_data.ktr_proc_ctor;
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ktp->sv_flags = p->p_sysent->sv_flags;
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ktr_submitrequest_ne(td, req);
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}
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void
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ktrprocctor(struct proc *p)
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{
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struct thread *td = curthread;
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if ((p->p_traceflag & KTRFAC_MASK) == 0)
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return;
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ktrace_enter(td);
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ktrprocctor_ne(td, p);
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ktrace_exit(td);
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}
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/*
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* When a process forks, enable tracing in the new process if needed.
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*/
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@ -523,8 +582,7 @@ void
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ktrprocfork(struct proc *p1, struct proc *p2)
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{
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PROC_LOCK_ASSERT(p1, MA_OWNED);
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PROC_LOCK_ASSERT(p2, MA_OWNED);
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PROC_LOCK(p1);
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mtx_lock(&ktrace_mtx);
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KASSERT(p2->p_tracevp == NULL, ("new process has a ktrace vnode"));
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if (p1->p_traceflag & KTRFAC_INHERIT) {
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@ -537,6 +595,9 @@ ktrprocfork(struct proc *p1, struct proc *p2)
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}
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}
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mtx_unlock(&ktrace_mtx);
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PROC_UNLOCK(p1);
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ktrprocctor(p2);
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}
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/*
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@ -971,6 +1032,9 @@ ktrops(td, p, ops, facs, vp)
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if (tracecred != NULL)
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crfree(tracecred);
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if ((p->p_traceflag & KTRFAC_MASK) != 0)
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ktrprocctor_ne(td, p);
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return (1);
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}
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@ -156,6 +156,7 @@ struct ktr_csw {
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*/
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struct sockaddr;
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struct stat;
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struct sysentvec;
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/*
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* KTR_SYSCTL - name of a sysctl MIB
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@ -163,6 +164,19 @@ struct stat;
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#define KTR_SYSCTL 9
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/* record contains null-terminated MIB name */
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/*
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* KTR_PROCCTOR - trace process creation (multiple ABI support)
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*/
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#define KTR_PROCCTOR 10
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struct ktr_proc_ctor {
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u_int sv_flags; /* struct sysentvec sv_flags copy */
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};
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/*
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* KTR_PROCDTOR - trace process destruction (multiple ABI support)
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*/
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#define KTR_PROCDTOR 11
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/*
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* KTR_DROP - If this bit is set in ktr_type, then at least one event
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* between the previous record and this record was dropped.
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@ -182,6 +196,8 @@ struct stat;
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#define KTRFAC_USER (1<<KTR_USER)
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#define KTRFAC_STRUCT (1<<KTR_STRUCT)
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#define KTRFAC_SYSCTL (1<<KTR_SYSCTL)
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#define KTRFAC_PROCCTOR (1<<KTR_PROCCTOR)
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#define KTRFAC_PROCDTOR (1<<KTR_PROCDTOR)
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/*
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* trace flags (also in p_traceflags)
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@ -198,6 +214,7 @@ void ktrgenio(int, enum uio_rw, struct uio *, int);
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void ktrsyscall(int, int narg, register_t args[]);
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void ktrsysctl(int *name, u_int namelen);
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void ktrsysret(int, int, register_t);
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void ktrprocctor(struct proc *);
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void ktrprocexec(struct proc *, struct ucred **, struct vnode **);
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void ktrprocexit(struct thread *);
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void ktrprocfork(struct proc *, struct proc *);
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