long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data)
{
compat_uint_t tmp;
long ret = -EIO;
switch (request) {
case PTRACE_PEEKUSR:
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr >= sizeof(struct pt_regs))
break;
tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
break;
case PTRACE_POKEUSR:
/* Some register values written here may be ignored in
* entry.S:syscall_restore_rfi; e.g. iaoq is written with
* r31/r31+4, and not with the values in pt_regs.
*/
if (addr == PT_PSW) {
/* Since PT_PSW==0, it is valid for 32 bit processes
* under 64 bit kernels as well.
*/
ret = arch_ptrace(child, request, addr, data);
} else {
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr >= sizeof(struct pt_regs))
break;
if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
/* Special case, fp regs are 64 bits anyway */
*(__u64 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
addr == PT_SAR+4) {
/* Zero the top 32 bits */
*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
*(__u32 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
}
break;
default:
ret = compat_ptrace_request(child, request, addr, data);
break;
}
return ret;
}
SYSCALL_DEFINE4(ptrace, long, request, long, pid, long, addr, long, data)
{
struct task_struct *child;
long ret;
/*
* This lock_kernel fixes a subtle race with suid exec
*/
lock_kernel();
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
if (!ret)
arch_ptrace_attach(current);
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto out;
}
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.
*/
if (!ret)
arch_ptrace_attach(child);
goto out_put_task_struct;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0)
goto out_put_task_struct;
if (gr_handle_ptrace(child, request)) {
ret = -EPERM;
goto out_put_task_struct;
}
ret = arch_ptrace(child, request, addr, data);
if (ret < 0)
goto out_put_task_struct;
out_put_task_struct:
put_task_struct(child);
out:
unlock_kernel();
return ret;
}
asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
long ret;
/*
* This lock_kernel fixes a subtle race with suid exec
*/
lock_kernel();
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto out;
}
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.
*/
if (!ret)
arch_ptrace_attach(child);
goto out_put_task_struct;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0)
goto out_put_task_struct;
ret = arch_ptrace(child, request, addr, data);
if (ret < 0)
goto out_put_task_struct;
out_put_task_struct:
put_task_struct(child);
out:
unlock_kernel();
return ret;
}
SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
unsigned long, data)
{
struct task_struct *child;
long ret;
#ifdef CONFIG_CCSECURITY
if (ccs_ptrace_permission(request, pid))
return -EPERM;
#endif
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
if (!ret)
arch_ptrace_attach(current);
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto out;
}
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.
*/
if (!ret)
arch_ptrace_attach(child);
goto out_put_task_struct;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0)
goto out_put_task_struct;
ret = arch_ptrace(child, request, addr, data);
out_put_task_struct:
put_task_struct(child);
out:
return ret;
}
SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
unsigned long, data)
{
struct task_struct *child;
long ret;
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
if (!ret)
arch_ptrace_attach(current);
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto out;
}
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.
*/
if (!ret)
arch_ptrace_attach(child);
goto out_put_task_struct;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0)
goto out_put_task_struct;
ret = arch_ptrace(child, request, addr, data);
if (ret || request != PTRACE_DETACH)
ptrace_unfreeze_traced(child);
out_put_task_struct:
put_task_struct(child);
out:
return ret;
}
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data)
{
compat_uint_t tmp;
long ret = -EIO;
switch (request) {
case PTRACE_PEEKUSR:
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr >= sizeof(struct pt_regs))
break;
tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
break;
/* Write the word at location addr in the USER area. This will need
to change when the kernel no longer saves all regs on a syscall.
FIXME. There is a problem at the moment in that r3-r18 are only
saved if the process is ptraced on syscall entry, and even then
those values are overwritten by actual register values on syscall
exit. */
case PTRACE_POKEUSR:
/* Some register values written here may be ignored in
* entry.S:syscall_restore_rfi; e.g. iaoq is written with
* r31/r31+4, and not with the values in pt_regs.
*/
if (addr == PT_PSW) {
/* Since PT_PSW==0, it is valid for 32 bit processes
* under 64 bit kernels as well.
*/
ret = arch_ptrace(child, request, addr, data);
} else {
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr >= sizeof(struct pt_regs))
break;
if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
/* Special case, fp regs are 64 bits anyway */
*(__u64 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
addr == PT_SAR+4) {
/* Zero the top 32 bits */
*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
*(__u32 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
}
break;
default:
ret = compat_ptrace_request(child, request, addr, data);
break;
}
return ret;
}
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data)
{
compat_uint_t tmp;
long ret = -EIO;
switch (request) {
case PTRACE_PEEKUSR:
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr >= sizeof(struct pt_regs))
break;
tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
break;
/*
*/
case PTRACE_POKEUSR:
/*
*/
if (addr == PT_PSW) {
/*
*/
ret = arch_ptrace(child, request, addr, data);
} else {
if (addr & (sizeof(compat_uint_t)-1))
break;
addr = translate_usr_offset(addr);
if (addr >= sizeof(struct pt_regs))
break;
if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
/* */
*(__u64 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
addr == PT_SAR+4) {
/* */
*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
*(__u32 *) ((char *) task_regs(child) + addr) = data;
ret = 0;
}
}
break;
default:
ret = compat_ptrace_request(child, request, addr, data);
break;
}
return ret;
}