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signal: Introduce copy_siginfo_from_user and use it's return value

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In preparation for using a smaller version of siginfo in the kernel
introduce copy_siginfo_from_user and use it when siginfo is copied from
userspace.

Make the pattern for using copy_siginfo_from_user and
copy_siginfo_from_user32 to capture the return value and return that
value on error.

This is a necessary prerequisite for using a smaller siginfo
in the kernel than the kernel exports to userspace.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2018-04-18 17:30:19 -05:00
parent f283801851
commit 4cd2e0e70a
3 changed files with 22 additions and 16 deletions
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kernel/ptrace.c
+5 -7
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@@ -919,9 +919,8 @@ int ptrace_request(struct task_struct *child, long request,
break;
case PTRACE_SETSIGINFO:
if (copy_from_user(&siginfo, datavp, sizeof siginfo))
ret = -EFAULT;
else
ret = copy_siginfo_from_user(&siginfo, datavp);
if (!ret)
ret = ptrace_setsiginfo(child, &siginfo);
break;
@@ -1215,10 +1214,9 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
break;
case PTRACE_SETSIGINFO:
if (copy_siginfo_from_user32(
&siginfo, (struct compat_siginfo __user *) datap))
ret = -EFAULT;
else
ret = copy_siginfo_from_user32(
&siginfo, (struct compat_siginfo __user *) datap);
if (!ret)
ret = ptrace_setsiginfo(child, &siginfo);
break;
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK