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arm64: ptrace: fix compat reg getter/setter return values

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copy_{to,from}_user return the number of bytes remaining on failure, not
an error code.

This patch returns -EFAULT when the copy operation didn't complete,
rather than expose the number of bytes not copied directly to userspace.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2014-08-22 14:20:24 +01:00
parent 27d7ff273c
commit 85487edd25
1 changed files with 7 additions and 3 deletions
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10
arch/arm64/kernel/ptrace.c
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@ -663,8 +663,10 @@ static int compat_gpr_get(struct task_struct *target,
kbuf += sizeof(reg);
} else {
ret = copy_to_user(ubuf, &reg, sizeof(reg));
if (ret)
if (ret) {
ret = -EFAULT;
break;
}
ubuf += sizeof(reg);
}
@ -702,8 +704,10 @@ static int compat_gpr_set(struct task_struct *target,
kbuf += sizeof(reg);
} else {
ret = copy_from_user(&reg, ubuf, sizeof(reg));
if (ret)
return ret;
if (ret) {
ret = -EFAULT;
break;
}
ubuf += sizeof(reg);
}