[PATCH 6.6 089/396] serial: Lock console when calling into driver before registration

Greg Kroah-Hartman
2024-04-01T16:41:08Z

From: Peter Collingbourne <pcc@google.com>

[ Upstream commit 801410b26a0e8b8a16f7915b2b55c9528b69ca87 ]

During the handoff from earlycon to the real console driver, we have
two separate drivers operating on the same device concurrently. In the
case of the 8250 driver these concurrent accesses cause problems due
to the driver's use of banked registers, controlled by LCR.DLAB. It is
possible for the setup(), config_port(), pm() and set_mctrl() callbacks
to set DLAB, which can cause the earlycon code that intends to access
TX to instead access DLL, leading to missed output and corruption on
the serial line due to unintended modifications to the baud rate.

In particular, for setup() we have:

univ8250_console_setup()
-> serial8250_console_setup()
-> uart_set_options()
-> serial8250_set_termios()
-> serial8250_do_set_termios()
-> serial8250_do_set_divisor()

For config_port() we have:

serial8250_config_port()
-> autoconfig()

For pm() we have:

serial8250_pm()
-> serial8250_do_pm()
-> serial8250_set_sleep()

For set_mctrl() we have (for some devices):

serial8250_set_mctrl()
-> omap8250_set_mctrl()
-> __omap8250_set_mctrl()

To avoid such problems, let's make it so that the console is locked
during pre-registration calls to these callbacks, which will prevent
the earlycon driver from running concurrently.

Remove the partial solution to this problem in the 8250 driver
that locked the console only during autoconfig_irq(), as this would
result in a deadlock with the new approach. The console continues
to be locked during autoconfig_irq() because it can only be called
through uart_configure_port().

Although this patch introduces more locking than strictly necessary
(and in particular it also locks during the call to rs485_config()
which is not affected by this issue as far as I can tell), it follows
the principle that it is the responsibility of the generic console
code to manage the earlycon handoff by ensuring that earlycon and real
console driver code cannot run concurrently, and not the individual
drivers.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Link: https://linux-review.googlesource.com/id/I7cf8124dcebf8618e6b2ee543fa5b25532de55d8
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240304214350.501253-1-pcc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/8250/8250_port.c | 6 ------
drivers/tty/serial/serial_core.c | 12 ++++++++++++
kernel/printk/printk.c | 21 ++++++++++++++++++---
3 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 141627370aabc..a17803da83f8c 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -1337,9 +1337,6 @@ static void autoconfig_irq(struct uart_8250_port *up)
inb_p(ICP);
}

- if (uart_console(port))
- console_lock();
-
/* forget possible initially masked and pending IRQ */
probe_irq_off(probe_irq_on());
save_mcr = serial8250_in_MCR(up);
@@ -1379,9 +1376,6 @@ static void autoconfig_irq(struct uart_8250_port *up)
if (port->flags & UPF_FOURPORT)
outb_p(save_ICP, ICP);

- if (uart_console(port))
- console_unlock();
-
port->irq = (irq > 0) ? irq : 0;
}

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 083ea4de48f9a..4c81210ad9b3a 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2602,7 +2602,12 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,
port->type = PORT_UNKNOWN;
flags |= UART_CONFIG_TYPE;
}
+ /* Synchronize with possible boot console. */
+ if (uart_console(port))
+ console_lock();
port->ops->config_port(port, flags);
+ if (uart_console(port))
+ console_unlock();
}

if (port->type != PORT_UNKNOWN) {
@@ -2610,6 +2615,10 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,

uart_report_port(drv, port);

+ /* Synchronize with possible boot console. */
+ if (uart_console(port))
+ console_lock();
+
/* Power up port for set_mctrl() */
uart_change_pm(state, UART_PM_STATE_ON);

@@ -2626,6 +2635,9 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,

uart_rs485_config(port);

+ if (uart_console(port))
+ console_unlock();
+
/*
* If this driver supports console, and it hasn't been
* successfully registered yet, try to re-register it.
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index b67fbae1299fa..c358c04d05162 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3284,6 +3284,21 @@ static int __init keep_bootcon_setup(char *str)

early_param("keep_bootcon", keep_bootcon_setup);

+static int console_call_setup(struct console *newcon, char *options)
+{
+ int err;
+
+ if (!newcon->setup)
+ return 0;
+
+ /* Synchronize with possible boot console. */
+ console_lock();
+ err = newcon->setup(newcon, options);
+ console_unlock();
+
+ return err;
+}
+
/*
* This is called by register_console() to try to match
* the newly registered console with any of the ones selected
@@ -3319,8 +3334,8 @@ static int try_enable_preferred_console(struct console *newcon,
if (_braille_register_console(newcon, c))
return 0;

- if (newcon->setup &&
- (err = newcon->setup(newcon, c->options)) != 0)
+ err = console_call_setup(newcon, c->options);
+ if (err)
return err;
}
newcon->flags |= CON_ENABLED;
@@ -3346,7 +3361,7 @@ static void try_enable_default_console(struct console *newcon)
if (newcon->index < 0)
newcon->index = 0;

- if (newcon->setup && newcon->setup(newcon, NULL) != 0)
+ if (console_call_setup(newcon, NULL) != 0)
return;

newcon->flags |= CON_ENABLED;
--
2.43.0