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s390/ptrace: guarded storage regset for the current task

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The regset functions for guarded storage are supposed to work on
the current task as well. For task == current add the required
load and store instructions for the guarded storage control block.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2017-05-19 15:32:09 +02:00
parent 53d7f25f09
commit f5bbd72198
1 changed files with 13 additions and 2 deletions
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13
arch/s390/kernel/ptrace.c
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@ -1160,6 +1160,8 @@ static int s390_gs_cb_get(struct task_struct *target,
return -ENODEV; return -ENODEV;
if (!data) if (!data)
return -ENODATA; return -ENODATA;
if (target == current)
save_gs_cb(data);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb)); data, 0, sizeof(struct gs_cb));
} }
@ -1170,6 +1172,7 @@ static int s390_gs_cb_set(struct task_struct *target,
const void *kbuf, const void __user *ubuf) const void *kbuf, const void __user *ubuf)
{ {
struct gs_cb *data = target->thread.gs_cb; struct gs_cb *data = target->thread.gs_cb;
int rc;
if (!MACHINE_HAS_GS) if (!MACHINE_HAS_GS)
return -ENODEV; return -ENODEV;
@ -1177,10 +1180,18 @@ static int s390_gs_cb_set(struct task_struct *target,
data = kzalloc(sizeof(*data), GFP_KERNEL); data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) if (!data)
return -ENOMEM; return -ENOMEM;
data->gsd = 25;
target->thread.gs_cb = data; target->thread.gs_cb = data;
if (target == current)
__ctl_set_bit(2, 4);
} else if (target == current) {
save_gs_cb(data);
} }
return user_regset_copyin(&pos, &count, &kbuf, &ubuf, rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb)); data, 0, sizeof(struct gs_cb));
if (target == current)
restore_gs_cb(data);
return rc;
} }
static int s390_gs_bc_get(struct task_struct *target, static int s390_gs_bc_get(struct task_struct *target,