lkml.org 
[lkml]   [2020]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/7] signal: factor copy_siginfo_to_external32 from copy_siginfo_to_user32
On Sun, 26 Apr 2020 09:40:39 +0200 Christoph Hellwig <hch@lst.de> wrote:

> On Sat, Apr 25, 2020 at 09:47:24PM -0700, Andrew Morton wrote:
> > I looked at fixing it but surely this sort of thing:
> >
> >
> > int copy_siginfo_to_user32(struct compat_siginfo __user *to,
> > const struct kernel_siginfo *from)
> > #if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
> > {
> > return __copy_siginfo_to_user32(to, from, in_x32_syscall());
> > }
> > int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
> > const struct kernel_siginfo *from, bool x32_ABI)
> > #endif
> > {
> > ...
> >
> >
> > is too ugly to live?
>
> I fixed it up in my earlier versions, but Eric insisted to keep it,
> which is why I switched to his version given that he is the defacto
> signal.c maintainer.
>
> Here is what I would have preferred:
>
> https://www.spinics.net/lists/kernel/msg3473847.html
> https://www.spinics.net/lists/kernel/msg3473840.html
> https://www.spinics.net/lists/kernel/msg3473843.html

OK, but that doesn't necessitate the above monstrosity? How about

static int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
const struct kernel_siginfo *from, bool x32_ABI)
{
struct compat_siginfo new;
copy_siginfo_to_external32(&new, from);
...
}

int copy_siginfo_to_user32(struct compat_siginfo __user *to,
const struct kernel_siginfo *from)
{
#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
return __copy_siginfo_to_user32(to, from, in_x32_syscall());
#else
return __copy_siginfo_to_user32(to, from, 0);
#endif
}

Or something like that - I didn't try very hard. We know how to do
this stuff, and surely this thing isn't how!

\
 
 \ /
  Last update: 2020-04-28 00:41    [W:0.144 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site