Messages in this thread Patch in this message | | | Date | Fri, 7 Jun 2019 12:32:23 +0200 | From | Oleg Nesterov <> | Subject | [PATCH 2/2] aio: fix the usage of restore_saved_sigmask_unless() |
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do_io_getevents() is the only user of set/restore_user_sigmask which can return success or error and deliver a signal which was temporary unblocked by set_user_sigmask().
Change it to keep the modified sigmask (pass true to restore_unless) only if the syscall returns ERESTARTNOHAND/EINTR. This matches all other syscalls which modify current->blocked before wait-for-event.
Note that it doesn't even need the signal_pending() check, read_event() wait_event_interruptible_hrtimeout() returns ERESTARTSYS if interrupted. But it seems that read_events() needs some unrelated cleanups which should be done first.
Signed-off-by: Oleg Nesterov <oleg@redhat.com> --- fs/aio.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c index 944eef7..5bdbef0 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -2034,7 +2034,6 @@ static long do_io_getevents(aio_context_t ctx_id, { ktime_t until = ts ? timespec64_to_ktime(*ts) : KTIME_MAX; struct kioctx *ioctx = lookup_ioctx(ctx_id); - bool interrupted; long ret = -EINVAL; if (likely(ioctx)) { @@ -2043,10 +2042,9 @@ static long do_io_getevents(aio_context_t ctx_id, percpu_ref_put(&ioctx->users); } - interrupted = signal_pending(current); - restore_saved_sigmask_unless(interrupted); - if (interrupted && !ret) + if (!ret && signal_pending(current)) ret = -ERESTARTNOHAND; + restore_saved_sigmask_unless(ret == -ERESTARTNOHAND); return ret; } -- 2.5.0
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