n_tty: signal and flush atomically

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commit 3b19e03229 upstream.

When handling signalling char, claim the termios write lock before
signalling waiting readers and writers to prevent further i/o
before flushing the echo and output buffers. This prevents a
userspace signal handler which may output from racing the terminal
flush.

Reference: Bugzilla #99351 ("Output truncated in ssh session after...")
Fixes: commit d2b6f44779 ("n_tty: Fix signal handling flushes")
Reported-by: Filipe Brandenburger <filbranden@google.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Peter Hurley 2015-06-27 09:21:32 -04:00 • committed by Greg Kroah-Hartman

parent f3ef6ad3e4

commit ba3961ad68

1 changed files with 13 additions and 3 deletions

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drivers/tty/n_tty.c

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