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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: Kevin F. Haggerty <haggertk@lineageos.org>
This commit is contained in:
Daniel Micay 2016-06-15 06:11:48 -04:00 committed by Francescodario Cuzzocrea
parent 07bee0ffb8
commit fcf033cefd
2 changed files with 21 additions and 0 deletions
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7
drivers/usb/core/hub.c
View file

@ -115,6 +115,8 @@ struct usb_hub {
void **port_owners;
};
int deny_new_usb = 0;
static inline int hub_is_superspeed(struct usb_device *hdev)
{
return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);
@ -3664,6 +3666,11 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
return;
}
if (deny_new_usb) {
dev_err(hub_dev, "denied insert of USB device on port %d\n", port1);
goto done;
}
for (i = 0; i < SET_CONFIG_TRIES; i++) {
/* reallocate for each attempt, since references

14
kernel/sysctl.c
View file

@ -93,6 +93,9 @@
#if defined(CONFIG_SYSCTL)
/* External variables not in a header file. */
#ifdef CONFIG_USB
extern int deny_new_usb;
#endif
extern int sysctl_overcommit_memory;
extern int sysctl_overcommit_ratio;
extern int max_threads;
@ -733,6 +736,17 @@ 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",