On Wed, 20 Mar 2019 01:32:53 +0300 "Dmitry V. Levin" <[email protected]> wrote:
> On Tue, Mar 19, 2019 at 12:19:57PM -0700, Andrei Vagin wrote: > > There are a few system calls (pselect, ppoll, etc) which replace a task > > sigmask while they are running in a kernel-space > > > > When a task calls one of these syscalls, the kernel saves a current > > sigmask in task->saved_sigmask and sets a syscall sigmask. > > > > On syscall-exit-stop, ptrace traps a task before restoring the > > saved_sigmask, so PTRACE_GETSIGMASK returns the syscall sigmask and > > PTRACE_SETSIGMASK does nothing, because its sigmask is replaced by > > saved_sigmask, when the task returns to user-space. > > > > This patch fixes this problem. PTRACE_GET_SIGMASK returns saved_sigmask > > is it's set. PTRACE_SETSIGMASK drops the TIF_RESTORE_SIGMASK flag. > > If it's not too late, could somebody tweak the commit message so that > PTRACE_GET_SIGMASK becomes PTRACE_GETSIGMASK and "is it's set" is changed > to "if it's set", please? I made those changes to my copy.
