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tty: fix leakage of -ERESTARTSYS to userland 

Spotted by Satoru Takeuchi.

kill_pgrp(task_pgrp(current)) sends the signal to the current's thread
group, but can choose any sub-thread as a target for signal_wake_up().
This means that job_control() and tty_check_change() may return
-ERESTARTSYS without signal_pending().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-06-01 00:46:53 -07:00 committed by Linus Torvalds
parent 13466c8419
commit 040b6362d5
2 changed files with 3 additions and 1 deletions
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1
drivers/char/n_tty.c
View File

@ -1191,6 +1191,7 @@ static int job_control(struct tty_struct *tty, struct file *file)
is_current_pgrp_orphaned()) is_current_pgrp_orphaned())
return -EIO; return -EIO;
kill_pgrp(task_pgrp(current), SIGTTIN, 1); kill_pgrp(task_pgrp(current), SIGTTIN, 1);
set_thread_flag(TIF_SIGPENDING);
return -ERESTARTSYS; return -ERESTARTSYS;
} }
} }

3
drivers/char/tty_io.c
View File

@ -1148,7 +1148,8 @@ int tty_check_change(struct tty_struct * tty)
return 0; return 0;
if (is_current_pgrp_orphaned()) if (is_current_pgrp_orphaned())
return -EIO; return -EIO;
(void) kill_pgrp(task_pgrp(current), SIGTTOU, 1); kill_pgrp(task_pgrp(current), SIGTTOU, 1);
set_thread_flag(TIF_SIGPENDING);
return -ERESTARTSYS; return -ERESTARTSYS;
} }