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Cygwin: console: Fix conflict on shared names between sessions. 

Previously, shared names in the console were created using get_minor().
However, get_minor() was not unique to the console across sessions.
This is because EnumWindows(), which is used to look for console windows,
cannot enumerate windows across sessions. This causes conflict on the
shared names between sessions (e.g. sessions of different users,
different services, a service and a user session, etc.).

With this patch, GetConsoleWindow() is used instead of get_minor().
GetConsoleWindow() has been used for the name of shared memory, which
should be unique to each console.

Addresses: https://cygwin.com/pipermail/cygwin/2024-April/255893.html
Fixes: ff4440fcf7 ("Cygwin: console: Introduce new thread which handles input signal.");
Reported-by: Johannes Khoshnazar-Thoma <johannes@johannesthoma.com>
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
This commit is contained in:
Takashi Yano 2024-07-03 22:35:20 +09:00
parent a5ffae1455
commit f7a77d0146
2 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
winsup/cygwin/fhandler/console.cc
View File

@ -66,6 +66,13 @@ static struct fhandler_base::rabuf_t con_ra;
in xterm compatible mode */
static wchar_t last_char;
static char *
cons_shared_name (char *ret_buf, const char *str, HWND hw)
{
__small_sprintf (ret_buf, "%s.%p", str, hw);
return ret_buf;
}
DWORD
fhandler_console::attach_console (pid_t owner, bool *err)
{
@ -922,7 +929,7 @@ fhandler_console::setup_io_mutex (void)
res = WAIT_FAILED;
if (!input_mutex || WAIT_FAILED == (res = acquire_input_mutex (0)))
{
shared_name (buf, "cygcons.input.mutex", get_minor ());
cons_shared_name (buf, "cygcons.input.mutex", GetConsoleWindow ());
input_mutex = OpenMutex (MAXIMUM_ALLOWED, TRUE, buf);
if (!input_mutex)
input_mutex = CreateMutex (&sec_none, FALSE, buf);
@ -938,7 +945,7 @@ fhandler_console::setup_io_mutex (void)
res = WAIT_FAILED;
if (!output_mutex || WAIT_FAILED == (res = acquire_output_mutex (0)))
{
shared_name (buf, "cygcons.output.mutex", get_minor ());
cons_shared_name (buf, "cygcons.output.mutex", GetConsoleWindow ());
output_mutex = OpenMutex (MAXIMUM_ALLOWED, TRUE, buf);
if (!output_mutex)
output_mutex = CreateMutex (&sec_none, FALSE, buf);
@ -1853,7 +1860,7 @@ fhandler_console::open (int flags, mode_t)
if (GetModuleHandle ("ConEmuHk64.dll"))
hook_conemu_cygwin_connector ();
char name[MAX_PATH];
shared_name (name, CONS_THREAD_SYNC, get_minor ());
cons_shared_name (name, CONS_THREAD_SYNC, GetConsoleWindow ());
thread_sync_event = CreateEvent(NULL, FALSE, FALSE, name);
if (thread_sync_event)
{
@ -1922,7 +1929,7 @@ fhandler_console::close ()
if (master_thread_started)
{
char name[MAX_PATH];
shared_name (name, CONS_THREAD_SYNC, get_minor ());
cons_shared_name (name, CONS_THREAD_SYNC, GetConsoleWindow ());
thread_sync_event = OpenEvent (MAXIMUM_ALLOWED, FALSE, name);
if (thread_sync_event)
{

3
winsup/cygwin/release/3.5.4
View File

@ -19,3 +19,6 @@ Fixes:
- Fix a problem that pty slave hangs on writing when pty master stops
to read.
Addresses: https://cygwin.com/pipermail/cygwin/2024-June/256178.html
- Fix conflict on shared name in console between sessions.
Addresses: https://cygwin.com/pipermail/cygwin/2024-April/255893.html