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* [newlib-cygwin] Cygwin: console: Avoid slipping past disable_master_thread check.
@ 2024-02-02 16:21 Takashi Yano
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From: Takashi Yano @ 2024-02-02 16:21 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c2be9bf5eb687389e4d0385839f2f5b78bb820be
commit c2be9bf5eb687389e4d0385839f2f5b78bb820be
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date: Sat Feb 3 00:54:23 2024 +0900
Cygwin: console: Avoid slipping past disable_master_thread check.
If disable_master_thread flag is set between the code checking that
flag not be set and the code acquiring input_mutex, input record is
processed once after setting disable_master_thread flag. This patch
prevents that.
Fixes: d4aacd50e6cf ("Cygwin: console: Add missing input_mutex guard.")
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Diff:
---
winsup/cygwin/fhandler/console.cc | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/fhandler/console.cc b/winsup/cygwin/fhandler/console.cc
index 6a42b4949..1c8d383cd 100644
--- a/winsup/cygwin/fhandler/console.cc
+++ b/winsup/cygwin/fhandler/console.cc
@@ -420,6 +420,12 @@ fhandler_console::cons_master_thread (handle_set_t *p, tty *ttyp)
}
WaitForSingleObject (p->input_mutex, mutex_timeout);
+ /* Ensure accessing input recored is not disabled. */
+ if (con.disable_master_thread)
+ {
+ ReleaseMutex (p->input_mutex);
+ continue;
+ }
total_read = 0;
switch (cygwait (p->input_handle, (DWORD) 0))
{
@@ -4545,8 +4551,6 @@ fhandler_console::set_disable_master_thread (bool x, fhandler_console *cons)
return;
}
const _minor_t unit = cons->get_minor ();
- if (con.disable_master_thread == x)
- return;
cons->acquire_input_mutex (mutex_timeout);
con.disable_master_thread = x;
cons->release_input_mutex ();
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