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authorBrian Bloniarz <brian.bloniarz@gmail.com>2016-03-07 00:16:30 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-01 23:22:54 +0300
commit0f40fbbcc34e093255a2b2d70b6b0fb48c3f39aa (patch)
treeedfa996be5ce50cd79dcfdfa96bb9d8490418660 /Documentation/serial
parentd11df61853f1d45035b7f5a6702c9b48d5f09a49 (diff)
downloadlinux-0f40fbbcc34e093255a2b2d70b6b0fb48c3f39aa.tar.xz
Fix OpenSSH pty regression on close
OpenSSH expects the (non-blocking) read() of pty master to return EAGAIN only if it has received all of the slave-side output after it has received SIGCHLD. This used to work on pre-3.12 kernels. This fix effectively forces non-blocking read() and poll() to block for parallel i/o to complete for all ttys. It also unwinds these changes: 1) f8747d4a466ab2cafe56112c51b3379f9fdb7a12 tty: Fix pty master read() after slave closes 2) 52bce7f8d4fc633c9a9d0646eef58ba6ae9a3b73 pty, n_tty: Simplify input processing on final close 3) 1a48632ffed61352a7810ce089dc5a8bcd505a60 pty: Fix input race when closing Inspired by analysis and patch from Marc Aurele La France <tsi@tuyoix.net> Reported-by: Volth <openssh@volth.com> Reported-by: Marc Aurele La France <tsi@tuyoix.net> BugLink: https://bugzilla.mindrot.org/show_bug.cgi?id=52 BugLink: https://bugzilla.mindrot.org/show_bug.cgi?id=2492 Signed-off-by: Brian Bloniarz <brian.bloniarz@gmail.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/serial')
-rw-r--r--Documentation/serial/tty.txt3
1 files changed, 0 insertions, 3 deletions
diff --git a/Documentation/serial/tty.txt b/Documentation/serial/tty.txt
index 798cba82c762..b48780977a68 100644
--- a/Documentation/serial/tty.txt
+++ b/Documentation/serial/tty.txt
@@ -210,9 +210,6 @@ TTY_IO_ERROR If set, causes all subsequent userspace read/write
TTY_OTHER_CLOSED Device is a pty and the other side has closed.
-TTY_OTHER_DONE Device is a pty and the other side has closed and
- all pending input processing has been completed.
-
TTY_NO_WRITE_SPLIT Prevent driver from splitting up writes into
smaller chunks.