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add toggle for disabling newly added USB devices

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Based on the public grsecurity patches.

Change-Id: I2cbea91b351cda7d098f4e1aa73dff1acbd23cce
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: starlight5234 <starlight5234@protonmail.ch>
This commit is contained in:
Daniel Micay 2017-05-16 17:51:48 -04:00 committed by Gagan Malvi
parent 4b2b333bbb
commit 092842330e
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GPG key ID: B932A7CE71E9198F
2 changed files with 22 additions and 0 deletions
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8
drivers/usb/core/hub.c
View file

@ -45,6 +45,8 @@
#define USB_TP_TRANSMISSION_DELAY 40 /* ns */
#define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */
int deny_new_usb __read_mostly = 0;
/* Protect struct usb_device->state and ->children members
* Note: Both are also protected by ->dev.sem, except that ->state can
* change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
@ -4995,6 +4997,12 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
goto done;
return;
}
if (deny_new_usb) {
dev_err(&port_dev->dev, "denied insert of USB device on port %d\n", port1);
goto done;
}
if (hub_is_superspeed(hub->hdev))
unit_load = 150;
else

14
kernel/sysctl.c
View file

@ -100,6 +100,9 @@
#if defined(CONFIG_SYSCTL)
/* External variables not in a header file. */
#ifdef CONFIG_USB
extern int deny_new_usb;
#endif
extern int suid_dumpable;
#ifdef CONFIG_COREDUMP
extern int core_uses_pid;
@ -1198,6 +1201,17 @@ static struct ctl_table kern_table[] = {
.extra1 = &zero,
.extra2 = &two,
},
#endif
#ifdef CONFIG_USB
{
.procname = "deny_new_usb",
.data = &deny_new_usb,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax_sysadmin,
.extra1 = &zero,
.extra2 = &one,
},
#endif
{
.procname = "ngroups_max",