Commit ad4f9576 authored by David S. Miller's avatar David S. Miller

[SPARC64]: Fix user accesses in regset code.

If target is not current we need to use access_process_vm().

Noticed by Roland McGrath.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c3cce97
......@@ -138,8 +138,17 @@ static int genregs64_get(struct task_struct *target,
(regs->u_regs[UREG_I6] + STACK_BIAS);
unsigned long window[16];
if (copy_from_user(window, reg_window, sizeof(window)))
return -EFAULT;
if (target == current) {
if (copy_from_user(window, reg_window, sizeof(window)))
return -EFAULT;
} else {
if (access_process_vm(target,
(unsigned long) reg_window,
window,
sizeof(window), 0) !=
sizeof(window))
return -EFAULT;
}
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
window,
......@@ -190,16 +199,37 @@ static int genregs64_set(struct task_struct *target,
(regs->u_regs[UREG_I6] + STACK_BIAS);
unsigned long window[16];
if (copy_from_user(window, reg_window, sizeof(window)))
return -EFAULT;
if (target == current) {
if (copy_from_user(window, reg_window, sizeof(window)))
return -EFAULT;
} else {
if (access_process_vm(target,
(unsigned long) reg_window,
window,
sizeof(window), 0) !=
sizeof(window))
return -EFAULT;
}
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
window,
16 * sizeof(u64),
32 * sizeof(u64));
if (!ret &&
copy_to_user(reg_window, window, sizeof(window)))
return -EFAULT;
if (!ret) {
if (target == current) {
if (copy_to_user(reg_window, window,
sizeof(window)))
return -EFAULT;
} else {
if (access_process_vm(target,
(unsigned long)
reg_window,
window,
sizeof(window), 1) !=
sizeof(window))
return -EFAULT;
}
}
}
if (!ret && count > 0) {
......@@ -412,9 +442,22 @@ static int genregs32_get(struct task_struct *target,
*k++ = regs->u_regs[pos++];
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
for (; count > 0 && pos < 32; count--) {
if (get_user(*k++, &reg_window[pos++]))
return -EFAULT;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (get_user(*k++, &reg_window[pos++]))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
k, sizeof(*k), 0)
!= sizeof(*k))
return -EFAULT;
k++;
pos++;
}
}
} else {
for (; count > 0 && pos < 16; count--) {
......@@ -423,10 +466,28 @@ static int genregs32_get(struct task_struct *target,
}
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
for (; count > 0 && pos < 32; count--) {
if (get_user(reg, &reg_window[pos++]) ||
put_user(reg, u++))
return -EFAULT;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (get_user(reg, &reg_window[pos++]) ||
put_user(reg, u++))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
&reg, sizeof(reg), 0)
!= sizeof(reg))
return -EFAULT;
if (access_process_vm(target,
(unsigned long) u,
&reg, sizeof(reg), 1)
!= sizeof(reg))
return -EFAULT;
pos++;
u++;
}
}
}
while (count > 0) {
......@@ -488,9 +549,23 @@ static int genregs32_set(struct task_struct *target,
regs->u_regs[pos++] = *k++;
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
for (; count > 0 && pos < 32; count--) {
if (put_user(*k++, &reg_window[pos++]))
return -EFAULT;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (put_user(*k++, &reg_window[pos++]))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
(void *) k,
sizeof(*k), 1)
!= sizeof(*k))
return -EFAULT;
k++;
pos++;
}
}
} else {
for (; count > 0 && pos < 16; count--) {
......@@ -500,10 +575,29 @@ static int genregs32_set(struct task_struct *target,
}
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
for (; count > 0 && pos < 32; count--) {
if (get_user(reg, u++) ||
put_user(reg, &reg_window[pos++]))
return -EFAULT;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (get_user(reg, u++) ||
put_user(reg, &reg_window[pos++]))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
u,
&reg, sizeof(reg), 0)
!= sizeof(reg))
return -EFAULT;
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
&reg, sizeof(reg), 1)
!= sizeof(reg))
return -EFAULT;
pos++;
u++;
}
}
}
while (count > 0) {
......
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