From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 3 Apr 2019 06:24:32 +0000 (-1000)
Subject: Merge tag 'pidfd-fixes-v5.1-rc3' of gitolite.kernel.org:pub/scm/linux/kernel/git... 
X-Git-Tag: v5.4-rc1~1287
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a816fd6b49b6b0628b968faefd49a6de4ce27066;p=platform%2Fkernel%2Flinux-rpi.git

Merge tag 'pidfd-fixes-v5.1-rc3' of gitolite.pub/scm/linux/kernel/git/brauner/linux

Pull pidfd fix from Christian Brauner:
 "This should be an uncontroversial fix for pidfd_send_signal() by Jann
  to better align it's behavior with other signal sending functions:

  In one of the early versions of the patchset it was suggested to not
  unconditionally error out when a signal with SI_USER is sent to a
  non-current task (cf. [1]).

  Instead, pidfd_send_signal() currently silently changes this to a
  regular kill signal. While this is technically fine, the semantics are
  weird since the kernel just silently converts a user's request behind
  their back and also no other signal sending function allows to do
  this. It gets more hairy when we introduce sending signals to a
  specific thread soon.

  So let's align pidfd_send_signal() with all the other signal sending
  functions and error out when SI_USER signals are sent to a non-current
  task"

* tag 'pidfd-fixes-v5.1-rc3' of gitolite.kernel.org:pub/scm/linux/kernel/git/brauner/linux:
  signal: don't silently convert SI_USER signals to non-current pidfd
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a816fd6b49b6b0628b968faefd49a6de4ce27066