ARM: fix missing syscall trace exit
authorRussell King <rmk+kernel@arm.linux.org.uk>
Fri, 15 May 2015 10:02:23 +0000 (11:02 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Fri, 15 May 2015 10:06:35 +0000 (11:06 +0100)
commit1b97937246d8b97c0760d16d8992c7937bdf5e6a
treec1a283d279d553bf0b1b975ee280efe202e0087a
parent965278dcb8ab0b1f666cc47937933c4be4aea48d
ARM: fix missing syscall trace exit

Josh Stone reports:

  I've discovered a case where both arm and arm64 will miss a ptrace
  syscall-exit that they should report.  If the syscall is entered
  without TIF_SYSCALL_TRACE set, then it goes on the fast path.  It's
  then possible to have TIF_SYSCALL_TRACE added in the middle of the
  syscall, but ret_fast_syscall doesn't check this flag again.

Fix this by always checking for a syscall trace in the fast exit path.

Reported-by: Josh Stone <jistone@redhat.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/kernel/entry-common.S