This is a note to let you know that I've just added the patch titled
tty: set_termios/set_termiox should not return -EINTR
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tty-set_termios-set_termiox-should-not-return-eintr.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 183d95cdd834381c594d3aa801c1f9f9c0c54fa9 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <[email protected]>
Date: Tue, 29 Jan 2013 20:07:41 +0100
Subject: tty: set_termios/set_termiox should not return -EINTR
From: Oleg Nesterov <[email protected]>
commit 183d95cdd834381c594d3aa801c1f9f9c0c54fa9 upstream.
See https://bugzilla.redhat.com/show_bug.cgi?id=904907
read command causes bash to abort with double free or corruption (out).
A simple test-case from Roman:
// Compile the reproducer and send sigchld ti that process.
// EINTR occurs even if SA_RESTART flag is set.
void handler(int sig)
{
}
main()
{
struct sigaction act;
act.sa_handler = handler;
act.sa_flags = SA_RESTART;
sigaction (SIGCHLD, &act, 0);
struct termio ttp;
ioctl(0, TCGETA, &ttp);
while(1)
{
if (ioctl(0, TCSETAW, ttp) < 0)
{
if (errno == EINTR)
{
fprintf(stderr, "BUG!"); return(1);
}
}
}
}
Change set_termios/set_termiox to return -ERESTARTSYS to fix this
particular problem.
I didn't dare to change other EINTR's in drivers/tty/, but they look
equally wrong.
Reported-by: Roman Rakus <[email protected]>
Reported-by: Lingzhu Xiang <[email protected]>
Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Jiri Slaby <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/tty/tty_ioctl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -617,7 +617,7 @@ static int set_termios(struct tty_struct
if (opt & TERMIOS_WAIT) {
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
- return -EINTR;
+ return -ERESTARTSYS;
}
tty_set_termios(tty, &tmp_termios);
@@ -684,7 +684,7 @@ static int set_termiox(struct tty_struct
if (opt & TERMIOS_WAIT) {
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
- return -EINTR;
+ return -ERESTARTSYS;
}
mutex_lock(&tty->termios_mutex);
Patches currently in stable-queue which might be from [email protected] are
queue-3.8/tty-set_termios-set_termiox-should-not-return-eintr.patch
queue-3.8/posix-cpu-timers-fix-nanosleep-task_struct-leak.patch
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