[vlc-devel] [PATCH 1/2] compat: Workaround sendmsg bug on some ArmV8 Android devices

Hugo Beauzée-Luyssen hugo at beauzee.fr
Thu Apr 4 13:45:53 CEST 2019

On Thu, Apr 4, 2019, at 1:42 PM, Rémi Denis-Courmont wrote:
> Hi all,
> 5 minutes git archeology through bionic repo leads to this:
> https://android.googlesource.com/platform/bionic.git/+/3d19a8319b9c27af8aa5cfbf495da0fe7fa62d3e
> The bug affect basically all system call wrappers with a signed 64-bits 
> return value type (including ssize_t).
> Clearly this patch ain't going to work.
> Le 4 avril 2019 10:54:44 GMT+03:00, "Hugo Beauzée-Luyssen" 
> <hugo at beauzee.fr> a écrit : On Wed, Apr 3, 2019, at 9:24 PM, Rémi 
> Denis-Courmont wrote:
> >> I don't know what you did or did not imply. When somebody states that a patch 
> >> is ugly, I tend to assume that they dislike the form rather than the essence.
> >> 
> >> My chief concerns are that, on the one hand, other system calls may also 
> >> exhibit the bug, and on the other hand, contribs may be affected as well. In 
> >> other words, I am concerned not that the patch is ugly, but that does not 
> >> solve the problem(s).
> > 
> > It solves the observed problem, but it doesn't solve problems I don't know about indeed.


Let aside the passive aggressiveness of the reply, this is exactly what I was hoping for by submitting the patch, that someone who knows libc/kernel more than I do figures out what the problem is.
I looked at the syscall wrapper but did not check the __set_errno it called, that's my bad.

Thanks for finding the actual error.

  Hugo Beauzée-Luyssen
  hugo at beauzee.fr

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