• Russell King's avatar
    ARM: fix missing syscall trace exit · 1b979372
    Russell King authored
    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: default avatarJosh Stone <jistone@redhat.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
entry-common.S 9.07 KB