diff options
Diffstat (limited to 'debian/patches/features/all/lockdown/0021-Lock-down-TIOCSSERIAL.patch')
| -rw-r--r-- | debian/patches/features/all/lockdown/0021-Lock-down-TIOCSSERIAL.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/debian/patches/features/all/lockdown/0021-Lock-down-TIOCSSERIAL.patch b/debian/patches/features/all/lockdown/0021-Lock-down-TIOCSSERIAL.patch new file mode 100644 index 000000000..d906326a9 --- /dev/null +++ b/debian/patches/features/all/lockdown/0021-Lock-down-TIOCSSERIAL.patch @@ -0,0 +1,34 @@ +From: David Howells <dhowells@redhat.com> +Date: Wed, 8 Nov 2017 15:11:35 +0000 +Subject: [21/29] Lock down TIOCSSERIAL +Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=f5fdeda0622ca040961521819794193777a03e8a + +Lock down TIOCSSERIAL as that can be used to change the ioport and irq +settings on a serial port. This only appears to be an issue for the serial +drivers that use the core serial code. All other drivers seem to either +ignore attempts to change port/irq or give an error. + +Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +Signed-off-by: David Howells <dhowells@redhat.com> +cc: Jiri Slaby <jslaby@suse.com> +--- + drivers/tty/serial/serial_core.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +Index: linux/drivers/tty/serial/serial_core.c +=================================================================== +--- linux.orig/drivers/tty/serial/serial_core.c ++++ linux/drivers/tty/serial/serial_core.c +@@ -850,6 +850,12 @@ static int uart_set_info(struct tty_stru + new_flags = (__force upf_t)new_info->flags; + old_custom_divisor = uport->custom_divisor; + ++ if ((change_port || change_irq) && ++ kernel_is_locked_down("Using TIOCSSERIAL to change device addresses, irqs and dma channels")) { ++ retval = -EPERM; ++ goto exit; ++ } ++ + if (!capable(CAP_SYS_ADMIN)) { + retval = -EPERM; + if (change_irq || change_port || |