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Allow ptrace to deal with lwpid.

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Reviewed by: marcel
This commit is contained in:
David Xu 2004-07-02 09:19:22 +00:00
parent 0f69c78ac2
commit f3b929bf42
1 changed files with 36 additions and 6 deletions
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42
sys/kern/sys_process.c
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@ -365,10 +365,11 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
struct iovec iov;
struct uio uio;
struct proc *curp, *p, *pp;
struct thread *td2;
struct thread *td2 = NULL;
struct ptrace_io_desc *piod;
int error, write, tmp;
int proctree_locked = 0;
lwpid_t tid = 0;
curp = td->td_proc;
@ -393,10 +394,35 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
p = td->td_proc;
PROC_LOCK(p);
} else {
if ((p = pfind(pid)) == NULL) {
if (proctree_locked)
sx_xunlock(&proctree_lock);
return (ESRCH);
if (pid <= PID_MAX) {
if ((p = pfind(pid)) == NULL) {
if (proctree_locked)
sx_xunlock(&proctree_lock);
return (ESRCH);
}
} else {
/* this is slow, should be optimized */
sx_slock(&allproc_lock);
FOREACH_PROC_IN_SYSTEM(p) {
PROC_LOCK(p);
mtx_lock_spin(&sched_lock);
FOREACH_THREAD_IN_PROC(p, td2) {
if (td2->td_tid == pid)
break;
}
mtx_unlock_spin(&sched_lock);
if (td2 != NULL)
break; /* proc lock held */
PROC_UNLOCK(p);
}
sx_sunlock(&allproc_lock);
if (p == NULL) {
if (proctree_locked)
sx_xunlock(&proctree_lock);
return (ESRCH);
}
tid = pid;
pid = p->p_pid;
}
}
if ((error = p_cansee(td, p)) != 0)
@ -413,6 +439,11 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
goto fail;
}
if (tid == 0) {
td2 = FIRST_THREAD_IN_PROC(p);
tid = td2->td_tid;
}
/*
* Permissions check
*/
@ -471,7 +502,6 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
break;
}
td2 = FIRST_THREAD_IN_PROC(p);
#ifdef FIX_SSTEP
/*
* Single step fixup ala procfs