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support PTRACE_PEEKTEXT and PTRACE_PEEKDATA.

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support PTRACE_POKETEXT and PTRACE_POKEDATA.
  now, force write anywhere.
  read-only page must copy-on-write.
This commit is contained in:
Susumu Komae
2015-01-29 15:02:15 +09:00
committed by postpeta
parent e30946f1f0
commit f97f8dbab3
1 changed files with 66 additions and 4 deletions
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70
kernel/syscall.c
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@@ -2726,6 +2726,64 @@ static long ptrace_setregs(int pid, long data)
return rc;
}
static long ptrace_peektext(int pid, long addr, long data)
{
long rc = -EIO;
struct process *child;
struct process *proc = cpu_local_var(current);
ihk_spinlock_t *savelock;
unsigned long irqstate;
unsigned long *p = (unsigned long *)data;
child = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!child)
return -ESRCH;
if(child->ftn->status == PS_TRACED){
unsigned long value;
ihk_mc_load_page_table(child->vm->page_table);
rc = copy_from_user(child, &value, (void *)addr, sizeof(value));
ihk_mc_load_page_table(proc->vm->page_table);
if (rc != 0) {
dkprintf("ptrace_peektext: bad area addr=0x%llx\n", addr);
} else {
rc = copy_to_user(proc, p, &value, sizeof(value));
}
}
ihk_mc_spinlock_unlock(savelock, irqstate);
return rc;
}
static long ptrace_poketext(int pid, long addr, long data)
{
long rc = -EIO;
struct process *child;
ihk_spinlock_t *savelock;
unsigned long irqstate;
child = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!child)
return -ESRCH;
if(child->ftn->status == PS_TRACED){
#if 0
/* XXX: revisit here, when fix #401.
* if read only, copy-on-write */
#else
unsigned long phys;
rc = ihk_mc_pt_virt_to_phys(child->vm->page_table, (void *)addr, &phys);
if (rc != 0) {
dkprintf("ptrace_poketext: bad address 0x%llx\n", addr);
} else {
*((long *)phys_to_virt(phys)) = data;
}
#endif
}
ihk_mc_spinlock_unlock(savelock, irqstate);
return rc;
}
static int ptrace_setoptions(int pid, int flags)
{
int ret;
@@ -2917,16 +2975,20 @@ SYSCALL_DECLARE(ptrace)
dkprintf("PTRACE_SETOPTIONS: flags=%d return=%p\n", data, error);
break;
case PTRACE_PEEKTEXT:
dkprintf("ptrace: unimplemented ptrace(PTRACE_PEEKTEXT) called.\n");
error = ptrace_peektext(pid, addr, data);
dkprintf("PTRACE_PEEKTEXT: addr=%p return=%p\n", addr, error);
break;
case PTRACE_PEEKDATA:
dkprintf("ptrace: unimplemented ptrace(PTRACE_PEEKDATA) called.\n");
error = ptrace_peektext(pid, addr, data);
dkprintf("PTRACE_PEEKDATA: addr=%p return=%p\n", addr, error);
break;
case PTRACE_POKETEXT:
dkprintf("ptrace: unimplemented ptrace(PTRACE_POKETEXT) called.\n");
error = ptrace_poketext(pid, addr, data);
dkprintf("PTRACE_POKETEXT: addr=%p data=%p\n", addr, data);
break;
case PTRACE_POKEDATA:
dkprintf("ptrace: unimplemented ptrace(PTRACE_POKEDATA) called.\n");
error = ptrace_poketext(pid, addr, data);
dkprintf("PTRACE_POKEDATA: addr=%p data=%p\n", addr, data);
break;
case PTRACE_SINGLESTEP:
dkprintf("ptrace: unimplemented ptrace(PTRACE_SINGLESTEP) called.\n");