diff options
Diffstat (limited to 'sys/kern/sys_process.c')
| -rw-r--r-- | sys/kern/sys_process.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c index 5bdeb78..f6622b3 100644 --- a/sys/kern/sys_process.c +++ b/sys/kern/sys_process.c @@ -276,8 +276,12 @@ ptrace(curp, uap) return EPERM; /* not being traced by YOU */ - if (p->p_pptr != curp) + PROCTREE_LOCK(PT_SHARED); + if (p->p_pptr != curp) { + PROCTREE_LOCK(PT_RELEASE); return EBUSY; + } + PROCTREE_LOCK(PT_RELEASE); /* not currently stopped */ mtx_enter(&sched_lock, MTX_SPIN); @@ -311,15 +315,19 @@ ptrace(curp, uap) case PT_TRACE_ME: /* set my trace flag and "owner" so it can read/write me */ p->p_flag |= P_TRACED; + PROCTREE_LOCK(PT_SHARED); p->p_oppid = p->p_pptr->p_pid; + PROCTREE_LOCK(PT_RELEASE); return 0; case PT_ATTACH: /* security check done above */ p->p_flag |= P_TRACED; + PROCTREE_LOCK(PT_EXCLUSIVE); p->p_oppid = p->p_pptr->p_pid; if (p->p_pptr != curp) proc_reparent(p, curp); + PROCTREE_LOCK(PT_RELEASE); uap->data = SIGSTOP; goto sendsig; /* in PT_CONTINUE below */ @@ -350,12 +358,14 @@ ptrace(curp, uap) if (uap->req == PT_DETACH) { /* reset process parent */ + PROCTREE_LOCK(PT_EXCLUSIVE); if (p->p_oppid != p->p_pptr->p_pid) { struct proc *pp; pp = pfind(p->p_oppid); proc_reparent(p, pp ? pp : initproc); } + PROCTREE_LOCK(PT_RELEASE); p->p_flag &= ~(P_TRACED | P_WAITED); p->p_oppid = 0; |
