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support PTRACE_ATTACH.

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fix PTRACE_TRACEME, PTRACE_DETACH.
This commit is contained in:
Susumu Komae
2015-01-30 21:02:01 +09:00
committed by postpeta
parent b26fa4e87c
commit 5f5ab34559
2 changed files with 92 additions and 17 deletions
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96
kernel/syscall.c
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@ -2833,6 +2833,87 @@ out:
return ret;
}
extern long alloc_debugreg(struct process *proc);
static int ptrace_attach(int pid)
{
int error = 0;
struct process *proc;
struct fork_tree_node *child, *next;
ihk_spinlock_t *savelock;
unsigned long irqstate;
struct siginfo info;
proc = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!proc) {
error = -ESRCH;
goto out;
}
ihk_mc_spinlock_unlock(savelock, irqstate);
dkprintf("ptrace_attach,pid=%d,proc->ftn->parent=%p\n", proc->ftn->pid, proc->ftn->parent);
if (proc->ftn->parent == NULL || proc->ftn->ptrace) {
error = -EPERM;
goto out;
}
dkprintf("ptrace_attach,parent->pid=%d\n", proc->ftn->parent->pid);
ihk_mc_spinlock_lock_noirq(&proc->ftn->lock);
ihk_mc_spinlock_lock_noirq(&proc->ftn->parent->lock);
list_for_each_entry_safe(child, next, &proc->ftn->parent->children, siblings_list) {
if(child == proc->ftn) {
list_del(&child->siblings_list);
goto found;
}
}
kprintf("ptrace_attach,not found\n");
error = -EPERM;
goto out_notfound;
found:
ihk_mc_spinlock_unlock_noirq(&proc->ftn->parent->lock);
proc->ftn->ptrace = PT_TRACED | PT_TRACE_EXEC;
proc->ftn->ppid_parent = proc->ftn->parent;
proc->ftn->parent = cpu_local_var(current)->ftn;
ihk_mc_spinlock_lock_noirq(&proc->ftn->parent->lock);
list_add_tail(&proc->ftn->ptrace_siblings_list, &proc->ftn->parent->ptrace_children);
ihk_mc_spinlock_unlock_noirq(&proc->ftn->parent->lock);
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
if (proc->ptrace_debugreg == NULL) {
error = alloc_debugreg(proc);
if (error < 0) {
goto out;
}
}
proc->uctx->rflags &= ~RFLAGS_TF; /* SingleStep clear */
/* TODO: other flags may reset */
memset(&info, '\0', sizeof info);
info.si_signo = SIGSTOP;
info.si_code = SI_USER;
info._sifields._kill.si_pid = cpu_local_var(current)->ftn->pid;
error = do_kill(pid, -1, SIGSTOP, &info, 0);
if (error < 0) {
goto out;
}
sched_wakeup_process(proc, PS_TRACED | PS_STOPPED);
out:
dkprintf("ptrace_attach,returning,error=%d\n", error);
return error;
out_notfound:
ihk_mc_spinlock_unlock_noirq(&proc->ftn->parent->lock);
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
goto out;
}
static int ptrace_detach(int pid, int data)
{
int error;
@ -2849,7 +2930,7 @@ static int ptrace_detach(int pid, int data)
}
ihk_mc_spinlock_unlock(savelock, irqstate);
if (!(proc->ftn->ptrace & PT_TRACED) || proc->ftn->parent == NULL) {
if (!(proc->ftn->ptrace & PT_TRACED) || proc->ftn->parent != cpu_local_var(current)->ftn) {
error = -ESRCH;
goto out;
}
@ -2895,23 +2976,17 @@ found:
/* TODO: other flags may clear */
if (data != 0) {
struct process *cur;
cur = cpu_local_var(current);
memset(&info, '\0', sizeof info);
info.si_signo = data;
info.si_code = SI_USER;
info._sifields._kill.si_pid = cur->ftn->pid;
info._sifields._kill.si_pid = cpu_local_var(current)->ftn->pid;
error = do_kill(pid, -1, data, &info, 1);
if (error < 0) {
goto out;
}
}
error = sched_wakeup_process(proc, PS_TRACED | PS_STOPPED);
if (error < 0) {
goto out;
}
sched_wakeup_process(proc, PS_TRACED | PS_STOPPED);
out:
return error;
out_notfound:
@ -3013,7 +3088,8 @@ SYSCALL_DECLARE(ptrace)
dkprintf("PTRACE_SETREGS: data=%p return=%p\n", data, error);
break;
case PTRACE_ATTACH:
dkprintf("ptrace: unimplemented ptrace(PTRACE_ATTACH) called.\n");
dkprintf("ptrace: PTRACE_ATTACH: pid=%d\n", pid);
error = ptrace_attach(pid);
break;
case PTRACE_DETACH:
dkprintf("ptrace: PTRACE_DETACH: data=%d\n", data);