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authorEric W. Biederman <ebiederm@xmission.com>2017-07-17 06:05:57 +0300
committerEric W. Biederman <ebiederm@xmission.com>2018-07-21 18:43:12 +0300
commit019191342fecce4a461978a7191a43f313e19e86 (patch)
treeb256a747d10ad9b2b674a5466f366b5109cc6509 /drivers/tty
parent6883f81aac6f44e7df70a6af189b3689ff52cbfb (diff)
downloadlinux-019191342fecce4a461978a7191a43f313e19e86.tar.xz
signal: Use PIDTYPE_TGID to clearly store where file signals will be sent
When f_setown is called a pid and a pid type are stored. Replace the use of PIDTYPE_PID with PIDTYPE_TGID as PIDTYPE_TGID goes to the entire thread group. Replace the use of PIDTYPE_MAX with PIDTYPE_PID as PIDTYPE_PID now is only for a thread. Update the users of __f_setown to use PIDTYPE_TGID instead of PIDTYPE_PID. For now the code continues to capture task_pid (when task_tgid would really be appropriate), and iterate on PIDTYPE_PID (even when type == PIDTYPE_TGID) out of an abundance of caution to preserve existing behavior. Oleg Nesterov suggested using the test to ensure we use PIDTYPE_PID for tgid lookup also be used to avoid taking the tasklist lock. Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/tty_io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index aba59521ad48..090fb7e78eea 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2122,7 +2122,7 @@ static int __tty_fasync(int fd, struct file *filp, int on)
type = PIDTYPE_PGID;
} else {
pid = task_pid(current);
- type = PIDTYPE_PID;
+ type = PIDTYPE_TGID;
}
get_pid(pid);
spin_unlock_irqrestore(&tty->ctrl_lock, flags);