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support ptrace(PTRACE_PEEKUSER, ...)

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This commit is contained in:
Tomoki Shirasawa
2014-10-08 14:56:28 +09:00
parent a101aa0534
commit 4b46330624
3 changed files with 144 additions and 4 deletions
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30
kernel/syscall.c
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@ -1379,6 +1379,8 @@ SYSCALL_DECLARE(arch_prctl)
ihk_mc_syscall_arg1(ctx));
}
extern void peekuser(struct process *proc, void *regs);
static int ptrace_report_exec(struct process *proc)
{
dkprintf("ptrace_report_exec,enter\n");
@ -1429,7 +1431,8 @@ static int ptrace_report_exec(struct process *proc)
/* Wake parent (if sleeping in wait4()) */
waitq_wakeup(&proc->ftn->parent->waitpid_q);
}
peekuser(proc, NULL);
/* Sleep */
dkprintf("ptrace_report_exec,sleeping\n");
proc->status = PS_TRACED;
@ -2375,13 +2378,32 @@ out:
return error;
}
static long ptrace_peekuser(int pid, long addr)
{
long rc = -EIO;
struct process *child;
ihk_spinlock_t *savelock;
unsigned long irqstate;
if(addr > sizeof(struct user) || addr < 0)
return -EFAULT;
child = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!child)
return -ESRCH;
if(child->status == PS_TRACED)
memcpy(&rc, (char *)child->userp + addr, 8);
ihk_mc_spinlock_unlock(savelock, irqstate);
return rc;
}
SYSCALL_DECLARE(ptrace)
{
const long request = (long)ihk_mc_syscall_arg0(ctx);
const int pid = (int)ihk_mc_syscall_arg1(ctx);
const long addr = (long)ihk_mc_syscall_arg2(ctx);
const long data = (long)ihk_mc_syscall_arg3(ctx);
int error;
long error = -EOPNOTSUPP;
switch(request) {
case PTRACE_TRACEME:
@ -2393,6 +2415,10 @@ SYSCALL_DECLARE(ptrace)
dkprintf("ptrace: PTRACE_KILL/CONT\n");
error = ptrace_wakeup_sig(pid, request, data);
break;
case PTRACE_PEEKUSER:
error = ptrace_peekuser(pid, addr);
dkprintf("PTRACE_PEEKUSER: addr=%p return=%p\n", addr, error);
break;
default:
dkprintf("ptrace: unimplemented ptrace called.\n");
break;