Hello, I found a potential bug titled " KASAN: slab-out-of-bounds Read in steelseries_remove " with modified syzkaller in the Linux6.12 - 6.15. This bug was verified to exist in 6.12.24,6.12.28 and 6.15.
During the execution of poc, for the same hdev device, in the function steelseries_probe, the sd of hdev is first set to the steelseries_device type. If sd->quriks=0x1, Then execute steelseries_srws1_probe to reset the sd of hdev to the type steelseries_srws1_data. However, when the device is removed and the steelseries_remove command is executed, the sd obtained through hdev will first be forcibly converted to the steelseries_device type, but the value of sd->quirks may not be 0x1, but rather become some pointer. For example, sd->quirks=0xffff888022167000, then steelseries_srws1_remove (hdev) cannot be executed. This will lead to type errors in subsequent access to sd (wrongly treating sd of type steelseries_srws1_data as of type steelseries_device), and an out-of-bounds access error occurs when accessing sd->lock. However, I still don't understand why the sd-> quirks of the same hdev in the detection phase and the deletion phase are completely inconsistent (even Pointers appear).
static int steelseries_probe(struct hid_device *hdev, const struct hid_device_id *id) { struct steelseries_device *sd; int ret;
sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL); ....... hid_set_drvdata(hdev, sd); [1] Set hdev->dev->driver_data to the type of steelseries_device ( hdev->dev->driver_data = sd ) sd->hdev = hdev; sd->quirks = id->driver_data; //Here, sd->quirks is assigned a value of 0x1
if (sd->quirks & STEELSERIES_SRWS1) { //Passed the inspection successfully #if IS_BUILTIN(CONFIG_LEDS_CLASS) || \ (IS_MODULE(CONFIG_LEDS_CLASS) && IS_MODULE(CONFIG_HID_STEELSERIES)) return steelseries_srws1_probe(hdev, id); [2] Set hdev->dev->driver_data to the type of steelseries_srws1_data #else return -ENODEV; #endif } ...... }
static int steelseries_srws1_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret, i; struct led_classdev *led; size_t name_sz; char *name;
struct steelseries_srws1_data *drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
if (drv_data == NULL) { hid_err(hdev, "can't alloc SRW-S1 memory\n"); return -ENOMEM; }
hid_set_drvdata(hdev, drv_data); [3] Set hdev->dev->driver_data to the type of steelseries_srws1_data }
static void steelseries_remove(struct hid_device *hdev) { struct steelseries_device *sd = hid_get_drvdata(hdev); [4] The default sd is of the steelseries_device type unsigned long flags;
if (sd->quirks & STEELSERIES_SRWS1) { [5]sd->quriks is not 0x1 but equal to the value of a pointer, such as 0xffff888022167000. Therefore, the inspection cannot be passed and steelseries_srws1_remove cannot be executed #if IS_BUILTIN(CONFIG_LEDS_CLASS) || \ (IS_MODULE(CONFIG_LEDS_CLASS) && IS_MODULE(CONFIG_HID_STEELSERIES)) steelseries_srws1_remove(hdev); #endif return; }
spin_lock_irqsave(&sd->lock, flags); [6] The correct type of sd is steelseries_srws1_data. However, here, sd is treated as the type of steelseries_srws1_data to access sd->quirks, resulting in out-of-bounds access ...... }
The commit of the kernel is : ef4999852d307d38cfdecd91ed6892cc03beb9b8 kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=55f8591b98dd132 compiler: gcc version 11.4.0
If you fix this issue, please add the following tag to the commit: Reported-by: Jianzhou Zhao luckd0g@163.com Reported-by: Penglei Jiang superman.xpt@gmail.com
I put the reproduction program of this bug at the end of the email.
------------[ cut here ]----------------------------------------- TITLE: KASAN: slab-out-of-bounds Read in steelseries_remove ------------[ cut here ]------------ ================================================================== BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x31b5/0x3f40 kernel/locking/lockdep.c:5065 Read of size 8 at addr ffff8880285a64d0 by task kworker/0:11/12464
CPU: 0 UID: 0 PID: 12464 Comm: kworker/0:11 Not tainted 6.12.28 #29 Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x10e/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc6/0x620 mm/kasan/report.c:488 kasan_report+0xd8/0x110 mm/kasan/report.c:601 __lock_acquire+0x31b5/0x3f40 kernel/locking/lockdep.c:5065 lock_acquire.part.0+0x11f/0x380 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 steelseries_remove+0x8c/0x1f0 drivers/hid/hid-steelseries.c:564 hid_device_remove+0xce/0x260 drivers/hid/hid-core.c:2758 device_remove+0xc8/0x170 drivers/base/dd.c:567 __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295 bus_remove_device+0x22f/0x420 drivers/base/bus.c:576 device_del+0x377/0x9c0 drivers/base/core.c:3881 hid_remove_device drivers/hid/hid-core.c:2942 [inline] hid_destroy_device+0xe5/0x150 drivers/hid/hid-core.c:2962 usbhid_disconnect+0xa0/0xe0 drivers/hid/usbhid/hid-core.c:1459 usb_unbind_interface+0x1e8/0x960 drivers/usb/core/driver.c:461 device_remove drivers/base/dd.c:569 [inline] device_remove+0x122/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295 bus_remove_device+0x22f/0x420 drivers/base/bus.c:576 device_del+0x377/0x9c0 drivers/base/core.c:3881 usb_disable_device+0x35f/0x7c0 drivers/usb/core/message.c:1418 usb_disconnect+0x2e0/0x920 drivers/usb/core/hub.c:2315 hub_port_connect drivers/usb/core/hub.c:5373 [inline] hub_port_connect_change drivers/usb/core/hub.c:5673 [inline] port_event drivers/usb/core/hub.c:5833 [inline] hub_event+0x1da4/0x4e20 drivers/usb/core/hub.c:5915 process_one_work+0x9c3/0x1b70 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x61e/0xe40 kernel/workqueue.c:3391 kthread+0x2ab/0x390 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK>
Allocated by task 2285: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] steelseries_srws1_probe drivers/hid/hid-steelseries.c:253 [inline] steelseries_probe+0x69d/0xf60 drivers/hid/hid-steelseries.c:528 __hid_device_probe drivers/hid/hid-core.c:2702 [inline] hid_device_probe+0x2f5/0x4f0 drivers/hid/hid-core.c:2739 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23a/0xa80 drivers/base/dd.c:657 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:957 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach+0x1e5/0x4b0 drivers/base/dd.c:1029 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534 device_add+0x1143/0x1a80 drivers/base/core.c:3692 hid_add_device+0x377/0xa60 drivers/hid/hid-core.c:2885 usbhid_probe+0xd41/0x1400 drivers/hid/usbhid/hid-core.c:1432 usb_probe_interface+0x309/0x9d0 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23a/0xa80 drivers/base/dd.c:657 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:957 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach+0x1e5/0x4b0 drivers/base/dd.c:1029 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534 device_add+0x1143/0x1a80 drivers/base/core.c:3692 usb_set_configuration+0x120e/0x1e10 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:254 usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:294 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23a/0xa80 drivers/base/dd.c:657 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:957 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach+0x1e5/0x4b0 drivers/base/dd.c:1029 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534 device_add+0x1143/0x1a80 drivers/base/core.c:3692 usb_new_device+0xd04/0x19d0 drivers/usb/core/hub.c:2662 hub_port_connect drivers/usb/core/hub.c:5533 [inline] hub_port_connect_change drivers/usb/core/hub.c:5673 [inline] port_event drivers/usb/core/hub.c:5833 [inline] hub_event+0x2d92/0x4e20 drivers/usb/core/hub.c:5915 process_one_work+0x9c3/0x1b70 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x61e/0xe40 kernel/workqueue.c:3391 kthread+0x2ab/0x390 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
The buggy address belongs to the object at ffff8880285a6400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 72 bytes to the right of allocated 136-byte region [ffff8880285a6400, ffff8880285a6488)
The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x285a6 ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b0413c0 ffffea0000875540 dead000000000003 raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 9743, tgid 9743 (syz-executor), ts 61586032132, free_ts 61073188909 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2f0/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0x7d6/0x3660 mm/page_alloc.c:3476 __alloc_pages_noprof+0x229/0x2670 mm/page_alloc.c:4754 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2425 [inline] allocate_slab mm/slub.c:2595 [inline] new_slab+0x2df/0x410 mm/slub.c:2649 ___slab_alloc+0xe2f/0x19a0 mm/slub.c:3837 __slab_alloc.isra.0+0x56/0xb0 mm/slub.c:3927 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] call_usermodehelper_setup+0xaf/0x360 kernel/umh.c:363 kobject_uevent_env+0x15fe/0x1860 lib/kobject_uevent.c:628 rx_queue_add_kobject net/core/net-sysfs.c:1124 [inline] net_rx_queue_update_kobjects+0x17c/0x5f0 net/core/net-sysfs.c:1164 register_queue_kobjects net/core/net-sysfs.c:1898 [inline] netdev_register_kobject+0x269/0x3a0 net/core/net-sysfs.c:2143 register_netdevice+0x1312/0x1db0 net/core/dev.c:10557 veth_newlink+0x354/0x9e0 drivers/net/veth.c:1830 rtnl_newlink_create net/core/rtnetlink.c:3542 [inline] __rtnl_newlink+0x1187/0x1910 net/core/rtnetlink.c:3762 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3775 page last free pid 9715 tgid 9715 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x6d7/0x1080 mm/page_alloc.c:2659 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x54/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] __kmalloc_cache_noprof+0x11e/0x300 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] kobject_uevent_env+0x265/0x1860 lib/kobject_uevent.c:540 __kobject_del+0x168/0x1f0 lib/kobject.c:601 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x327/0x5a0 lib/kobject.c:737 net_rx_queue_update_kobjects+0x476/0x5f0 net/core/net-sysfs.c:1178 netif_set_real_num_rx_queues+0x169/0x210 net/core/dev.c:3055 veth_init_queues+0x151/0x190 drivers/net/veth.c:1761 veth_newlink+0x530/0x9e0 drivers/net/veth.c:1873 rtnl_newlink_create net/core/rtnetlink.c:3542 [inline] __rtnl_newlink+0x1187/0x1910 net/core/rtnetlink.c:3762 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3775 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6678 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2537
Memory state around the buggy address: ffff8880285a6380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff8880285a6400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880285a6480: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^ ffff8880285a6500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880285a6580: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ==================================================================
// autogenerated by syzkaller (https://github.com/google/syzkaller)
#define _GNU_SOURCE
#include <dirent.h> #include <endian.h> #include <errno.h> #include <fcntl.h> #include <signal.h> #include <stdarg.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/mount.h> #include <sys/prctl.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> #include <unistd.h>
#include <linux/usb/ch9.h>
static unsigned long long procid;
static void sleep_ms(uint64_t ms) { usleep(ms * 1000); }
static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; }
static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; }
#define MAX_FDS 30
#define USB_MAX_IFACE_NUM 4 #define USB_MAX_EP_NUM 32 #define USB_MAX_FDS 6
struct usb_endpoint_index { struct usb_endpoint_descriptor desc; int handle; };
struct usb_iface_index { struct usb_interface_descriptor* iface; uint8_t bInterfaceNumber; uint8_t bAlternateSetting; uint8_t bInterfaceClass; struct usb_endpoint_index eps[USB_MAX_EP_NUM]; int eps_num; };
struct usb_device_index { struct usb_device_descriptor* dev; struct usb_config_descriptor* config; uint8_t bDeviceClass; uint8_t bMaxPower; int config_length; struct usb_iface_index ifaces[USB_MAX_IFACE_NUM]; int ifaces_num; int iface_cur; };
struct usb_info { int fd; struct usb_device_index index; };
static struct usb_info usb_devices[USB_MAX_FDS];
static struct usb_device_index* lookup_usb_index(int fd) { for (int i = 0; i < USB_MAX_FDS; i++) { if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd) return &usb_devices[i].index; } return NULL; }
static int usb_devices_num;
static bool parse_usb_descriptor(const char* buffer, size_t length, struct usb_device_index* index) { if (length < sizeof(*index->dev) + sizeof(*index->config)) return false; memset(index, 0, sizeof(*index)); index->dev = (struct usb_device_descriptor*)buffer; index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev)); index->bDeviceClass = index->dev->bDeviceClass; index->bMaxPower = index->config->bMaxPower; index->config_length = length - sizeof(*index->dev); index->iface_cur = -1; size_t offset = 0; while (true) { if (offset + 1 >= length) break; uint8_t desc_length = buffer[offset]; uint8_t desc_type = buffer[offset + 1]; if (desc_length <= 2) break; if (offset + desc_length > length) break; if (desc_type == USB_DT_INTERFACE && index->ifaces_num < USB_MAX_IFACE_NUM) { struct usb_interface_descriptor* iface = (struct usb_interface_descriptor*)(buffer + offset); index->ifaces[index->ifaces_num].iface = iface; index->ifaces[index->ifaces_num].bInterfaceNumber = iface->bInterfaceNumber; index->ifaces[index->ifaces_num].bAlternateSetting = iface->bAlternateSetting; index->ifaces[index->ifaces_num].bInterfaceClass = iface->bInterfaceClass; index->ifaces_num++; } if (desc_type == USB_DT_ENDPOINT && index->ifaces_num > 0) { struct usb_iface_index* iface = &index->ifaces[index->ifaces_num - 1]; if (iface->eps_num < USB_MAX_EP_NUM) { memcpy(&iface->eps[iface->eps_num].desc, buffer + offset, sizeof(iface->eps[iface->eps_num].desc)); iface->eps_num++; } } offset += desc_length; } return true; }
static struct usb_device_index* add_usb_index(int fd, const char* dev, size_t dev_len) { int i = __atomic_fetch_add(&usb_devices_num, 1, __ATOMIC_RELAXED); if (i >= USB_MAX_FDS) return NULL; if (!parse_usb_descriptor(dev, dev_len, &usb_devices[i].index)) return NULL; __atomic_store_n(&usb_devices[i].fd, fd, __ATOMIC_RELEASE); return &usb_devices[i].index; }
struct vusb_connect_string_descriptor { uint32_t len; char* str; } __attribute__((packed));
struct vusb_connect_descriptors { uint32_t qual_len; char* qual; uint32_t bos_len; char* bos; uint32_t strs_len; struct vusb_connect_string_descriptor strs[0]; } __attribute__((packed));
static const char default_string[] = { 8, USB_DT_STRING, 's', 0, 'y', 0, 'z', 0 };
static const char default_lang_id[] = { 4, USB_DT_STRING, 0x09, 0x04 };
static bool lookup_connect_response_in(int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl, struct usb_qualifier_descriptor* qual, char** response_data, uint32_t* response_length) { struct usb_device_index* index = lookup_usb_index(fd); uint8_t str_idx; if (!index) return false; switch (ctrl->bRequestType & USB_TYPE_MASK) { case USB_TYPE_STANDARD: switch (ctrl->bRequest) { case USB_REQ_GET_DESCRIPTOR: switch (ctrl->wValue >> 8) { case USB_DT_DEVICE: *response_data = (char*)index->dev; *response_length = sizeof(*index->dev); return true; case USB_DT_CONFIG: *response_data = (char*)index->config; *response_length = index->config_length; return true; case USB_DT_STRING: str_idx = (uint8_t)ctrl->wValue; if (descs && str_idx < descs->strs_len) { *response_data = descs->strs[str_idx].str; *response_length = descs->strs[str_idx].len; return true; } if (str_idx == 0) { *response_data = (char*)&default_lang_id[0]; *response_length = default_lang_id[0]; return true; } *response_data = (char*)&default_string[0]; *response_length = default_string[0]; return true; case USB_DT_BOS: *response_data = descs->bos; *response_length = descs->bos_len; return true; case USB_DT_DEVICE_QUALIFIER: if (!descs->qual) { qual->bLength = sizeof(*qual); qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; qual->bcdUSB = index->dev->bcdUSB; qual->bDeviceClass = index->dev->bDeviceClass; qual->bDeviceSubClass = index->dev->bDeviceSubClass; qual->bDeviceProtocol = index->dev->bDeviceProtocol; qual->bMaxPacketSize0 = index->dev->bMaxPacketSize0; qual->bNumConfigurations = index->dev->bNumConfigurations; qual->bRESERVED = 0; *response_data = (char*)qual; *response_length = sizeof(*qual); return true; } *response_data = descs->qual; *response_length = descs->qual_len; return true; default: break; } break; default: break; } break; default: break; } return false; }
typedef bool (*lookup_connect_out_response_t)(int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl, bool* done);
static bool lookup_connect_response_out_generic(int fd, const struct vusb_connect_descriptors* descs, const struct usb_ctrlrequest* ctrl, bool* done) { switch (ctrl->bRequestType & USB_TYPE_MASK) { case USB_TYPE_STANDARD: switch (ctrl->bRequest) { case USB_REQ_SET_CONFIGURATION: *done = true; return true; default: break; } break; } return false; }
struct vusb_descriptor { uint8_t req_type; uint8_t desc_type; uint32_t len; char data[0]; } __attribute__((packed));
struct vusb_descriptors { uint32_t len; struct vusb_descriptor* generic; struct vusb_descriptor* descs[0]; } __attribute__((packed));
struct vusb_response { uint8_t type; uint8_t req; uint32_t len; char data[0]; } __attribute__((packed));
struct vusb_responses { uint32_t len; struct vusb_response* generic; struct vusb_response* resps[0]; } __attribute__((packed));
static bool lookup_control_response(const struct vusb_descriptors* descs, const struct vusb_responses* resps, struct usb_ctrlrequest* ctrl, char** response_data, uint32_t* response_length) { int descs_num = 0; int resps_num = 0; if (descs) descs_num = (descs->len - offsetof(struct vusb_descriptors, descs)) / sizeof(descs->descs[0]); if (resps) resps_num = (resps->len - offsetof(struct vusb_responses, resps)) / sizeof(resps->resps[0]); uint8_t req = ctrl->bRequest; uint8_t req_type = ctrl->bRequestType & USB_TYPE_MASK; uint8_t desc_type = ctrl->wValue >> 8; if (req == USB_REQ_GET_DESCRIPTOR) { int i; for (i = 0; i < descs_num; i++) { struct vusb_descriptor* desc = descs->descs[i]; if (!desc) continue; if (desc->req_type == req_type && desc->desc_type == desc_type) { *response_length = desc->len; if (*response_length != 0) *response_data = &desc->data[0]; else *response_data = NULL; return true; } } if (descs && descs->generic) { *response_data = &descs->generic->data[0]; *response_length = descs->generic->len; return true; } } else { int i; for (i = 0; i < resps_num; i++) { struct vusb_response* resp = resps->resps[i]; if (!resp) continue; if (resp->type == req_type && resp->req == req) { *response_length = resp->len; if (*response_length != 0) *response_data = &resp->data[0]; else *response_data = NULL; return true; } } if (resps && resps->generic) { *response_data = &resps->generic->data[0]; *response_length = resps->generic->len; return true; } } return false; }
#define UDC_NAME_LENGTH_MAX 128
struct usb_raw_init { __u8 driver_name[UDC_NAME_LENGTH_MAX]; __u8 device_name[UDC_NAME_LENGTH_MAX]; __u8 speed; };
enum usb_raw_event_type { USB_RAW_EVENT_INVALID = 0, USB_RAW_EVENT_CONNECT = 1, USB_RAW_EVENT_CONTROL = 2, };
struct usb_raw_event { __u32 type; __u32 length; __u8 data[0]; };
struct usb_raw_ep_io { __u16 ep; __u16 flags; __u32 length; __u8 data[0]; };
#define USB_RAW_EPS_NUM_MAX 30 #define USB_RAW_EP_NAME_MAX 16 #define USB_RAW_EP_ADDR_ANY 0xff
struct usb_raw_ep_caps { __u32 type_control : 1; __u32 type_iso : 1; __u32 type_bulk : 1; __u32 type_int : 1; __u32 dir_in : 1; __u32 dir_out : 1; };
struct usb_raw_ep_limits { __u16 maxpacket_limit; __u16 max_streams; __u32 reserved; };
struct usb_raw_ep_info { __u8 name[USB_RAW_EP_NAME_MAX]; __u32 addr; struct usb_raw_ep_caps caps; struct usb_raw_ep_limits limits; };
struct usb_raw_eps_info { struct usb_raw_ep_info eps[USB_RAW_EPS_NUM_MAX]; };
#define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init) #define USB_RAW_IOCTL_RUN _IO('U', 1) #define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event) #define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io) #define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io) #define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor) #define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32) #define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io) #define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io) #define USB_RAW_IOCTL_CONFIGURE _IO('U', 9) #define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32) #define USB_RAW_IOCTL_EPS_INFO _IOR('U', 11, struct usb_raw_eps_info) #define USB_RAW_IOCTL_EP0_STALL _IO('U', 12) #define USB_RAW_IOCTL_EP_SET_HALT _IOW('U', 13, __u32) #define USB_RAW_IOCTL_EP_CLEAR_HALT _IOW('U', 14, __u32) #define USB_RAW_IOCTL_EP_SET_WEDGE _IOW('U', 15, __u32)
static int usb_raw_open() { return open("/dev/raw-gadget", O_RDWR); }
static int usb_raw_init(int fd, uint32_t speed, const char* driver, const char* device) { struct usb_raw_init arg; strncpy((char*)&arg.driver_name[0], driver, sizeof(arg.driver_name)); strncpy((char*)&arg.device_name[0], device, sizeof(arg.device_name)); arg.speed = speed; return ioctl(fd, USB_RAW_IOCTL_INIT, &arg); }
static int usb_raw_run(int fd) { return ioctl(fd, USB_RAW_IOCTL_RUN, 0); }
static int usb_raw_configure(int fd) { return ioctl(fd, USB_RAW_IOCTL_CONFIGURE, 0); }
static int usb_raw_vbus_draw(int fd, uint32_t power) { return ioctl(fd, USB_RAW_IOCTL_VBUS_DRAW, power); }
static int usb_raw_ep0_write(int fd, struct usb_raw_ep_io* io) { return ioctl(fd, USB_RAW_IOCTL_EP0_WRITE, io); }
static int usb_raw_ep0_read(int fd, struct usb_raw_ep_io* io) { return ioctl(fd, USB_RAW_IOCTL_EP0_READ, io); }
static int usb_raw_event_fetch(int fd, struct usb_raw_event* event) { return ioctl(fd, USB_RAW_IOCTL_EVENT_FETCH, event); }
static int usb_raw_ep_enable(int fd, struct usb_endpoint_descriptor* desc) { return ioctl(fd, USB_RAW_IOCTL_EP_ENABLE, desc); }
static int usb_raw_ep_disable(int fd, int ep) { return ioctl(fd, USB_RAW_IOCTL_EP_DISABLE, ep); }
static int usb_raw_ep0_stall(int fd) { return ioctl(fd, USB_RAW_IOCTL_EP0_STALL, 0); }
static int lookup_interface(int fd, uint8_t bInterfaceNumber, uint8_t bAlternateSetting) { struct usb_device_index* index = lookup_usb_index(fd); if (!index) return -1; for (int i = 0; i < index->ifaces_num; i++) { if (index->ifaces[i].bInterfaceNumber == bInterfaceNumber && index->ifaces[i].bAlternateSetting == bAlternateSetting) return i; } return -1; }
#define USB_MAX_PACKET_SIZE 4096
struct usb_raw_control_event { struct usb_raw_event inner; struct usb_ctrlrequest ctrl; char data[USB_MAX_PACKET_SIZE]; };
struct usb_raw_ep_io_data { struct usb_raw_ep_io inner; char data[USB_MAX_PACKET_SIZE]; };
static void set_interface(int fd, int n) { struct usb_device_index* index = lookup_usb_index(fd); if (!index) return; if (index->iface_cur >= 0 && index->iface_cur < index->ifaces_num) { for (int ep = 0; ep < index->ifaces[index->iface_cur].eps_num; ep++) { int rv = usb_raw_ep_disable(fd, index->ifaces[index->iface_cur].eps[ep].handle); if (rv < 0) { } else { } } } if (n >= 0 && n < index->ifaces_num) { for (int ep = 0; ep < index->ifaces[n].eps_num; ep++) { int rv = usb_raw_ep_enable(fd, &index->ifaces[n].eps[ep].desc); if (rv < 0) { } else { index->ifaces[n].eps[ep].handle = rv; } } index->iface_cur = n; } }
static int configure_device(int fd) { struct usb_device_index* index = lookup_usb_index(fd); if (!index) return -1; int rv = usb_raw_vbus_draw(fd, index->bMaxPower); if (rv < 0) { return rv; } rv = usb_raw_configure(fd); if (rv < 0) { return rv; } set_interface(fd, 0); return 0; }
static volatile long syz_usb_connect_impl(uint64_t speed, uint64_t dev_len, const char* dev, const struct vusb_connect_descriptors* descs, lookup_connect_out_response_t lookup_connect_response_out) { if (!dev) { return -1; } int fd = usb_raw_open(); if (fd < 0) { return fd; } if (fd >= MAX_FDS) { close(fd); return -1; } struct usb_device_index* index = add_usb_index(fd, dev, dev_len); if (!index) { return -1; } char device[32]; sprintf(&device[0], "dummy_udc.%llu", procid); int rv = usb_raw_init(fd, speed, "dummy_udc", &device[0]); if (rv < 0) { return rv; } rv = usb_raw_run(fd); if (rv < 0) { return rv; } bool done = false; while (!done) { struct usb_raw_control_event event; event.inner.type = 0; event.inner.length = sizeof(event.ctrl); rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event); if (rv < 0) { return rv; } if (event.inner.type != USB_RAW_EVENT_CONTROL) continue; char* response_data = NULL; uint32_t response_length = 0; struct usb_qualifier_descriptor qual; if (event.ctrl.bRequestType & USB_DIR_IN) { if (!lookup_connect_response_in(fd, descs, &event.ctrl, &qual, &response_data, &response_length)) { usb_raw_ep0_stall(fd); continue; } } else { if (!lookup_connect_response_out(fd, descs, &event.ctrl, &done)) { usb_raw_ep0_stall(fd); continue; } response_data = NULL; response_length = event.ctrl.wLength; } if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD && event.ctrl.bRequest == USB_REQ_SET_CONFIGURATION) { rv = configure_device(fd); if (rv < 0) { return rv; } } struct usb_raw_ep_io_data response; response.inner.ep = 0; response.inner.flags = 0; if (response_length > sizeof(response.data)) response_length = 0; if (event.ctrl.wLength < response_length) response_length = event.ctrl.wLength; response.inner.length = response_length; if (response_data) memcpy(&response.data[0], response_data, response_length); else memset(&response.data[0], 0, response_length); if (event.ctrl.bRequestType & USB_DIR_IN) { rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response); } else { rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response); } if (rv < 0) { return rv; } } sleep_ms(200); return fd; }
static volatile long syz_usb_connect(volatile long a0, volatile long a1, volatile long a2, volatile long a3) { uint64_t speed = a0; uint64_t dev_len = a1; const char* dev = (const char*)a2; const struct vusb_connect_descriptors* descs = (const struct vusb_connect_descriptors*)a3; return syz_usb_connect_impl(speed, dev_len, dev, descs, &lookup_connect_response_out_generic); }
static volatile long syz_usb_control_io(volatile long a0, volatile long a1, volatile long a2) { int fd = a0; const struct vusb_descriptors* descs = (const struct vusb_descriptors*)a1; const struct vusb_responses* resps = (const struct vusb_responses*)a2; struct usb_raw_control_event event; event.inner.type = 0; event.inner.length = USB_MAX_PACKET_SIZE; int rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event); if (rv < 0) { return rv; } if (event.inner.type != USB_RAW_EVENT_CONTROL) { return -1; } char* response_data = NULL; uint32_t response_length = 0; if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) { if (!lookup_control_response(descs, resps, &event.ctrl, &response_data, &response_length)) { usb_raw_ep0_stall(fd); return -1; } } else { if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD || event.ctrl.bRequest == USB_REQ_SET_INTERFACE) { int iface_num = event.ctrl.wIndex; int alt_set = event.ctrl.wValue; int iface_index = lookup_interface(fd, iface_num, alt_set); if (iface_index < 0) { } else { set_interface(fd, iface_index); } } response_length = event.ctrl.wLength; } struct usb_raw_ep_io_data response; response.inner.ep = 0; response.inner.flags = 0; if (response_length > sizeof(response.data)) response_length = 0; if (event.ctrl.wLength < response_length) response_length = event.ctrl.wLength; if ((event.ctrl.bRequestType & USB_DIR_IN) && !event.ctrl.wLength) { response_length = USB_MAX_PACKET_SIZE; } response.inner.length = response_length; if (response_data) memcpy(&response.data[0], response_data, response_length); else memset(&response.data[0], 0, response_length); if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) { rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response); } else { rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response); } if (rv < 0) { return rv; } sleep_ms(200); return 0; }
static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } }
static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); }
static void execute_one(void);
#define WAIT_FLAGS __WALL
static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } }
uint64_t r[1] = {0xffffffffffffffff};
void execute_one(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {} *(uint8_t*)0x200000000040 = 0x12; *(uint8_t*)0x200000000041 = 1; *(uint16_t*)0x200000000042 = 0x200; *(uint8_t*)0x200000000044 = 0; *(uint8_t*)0x200000000045 = 0; *(uint8_t*)0x200000000046 = 0; *(uint8_t*)0x200000000047 = 8; *(uint16_t*)0x200000000048 = 0x1038; *(uint16_t*)0x20000000004a = 0x1410; *(uint16_t*)0x20000000004c = 0; *(uint8_t*)0x20000000004e = 0; *(uint8_t*)0x20000000004f = 0; *(uint8_t*)0x200000000050 = 0; *(uint8_t*)0x200000000051 = 1; *(uint8_t*)0x200000000052 = 9; *(uint8_t*)0x200000000053 = 2; *(uint16_t*)0x200000000054 = 0x24; *(uint8_t*)0x200000000056 = 1; *(uint8_t*)0x200000000057 = 0; *(uint8_t*)0x200000000058 = 0; *(uint8_t*)0x200000000059 = 0; *(uint8_t*)0x20000000005a = 2; *(uint8_t*)0x20000000005b = 9; *(uint8_t*)0x20000000005c = 4; *(uint8_t*)0x20000000005d = 0; *(uint8_t*)0x20000000005e = 0; *(uint8_t*)0x20000000005f = 1; *(uint8_t*)0x200000000060 = 3; *(uint8_t*)0x200000000061 = 0; *(uint8_t*)0x200000000062 = 1; *(uint8_t*)0x200000000063 = 0; *(uint8_t*)0x200000000064 = 9; *(uint8_t*)0x200000000065 = 0x21; *(uint16_t*)0x200000000066 = 8; *(uint8_t*)0x200000000068 = 0xfd; *(uint8_t*)0x200000000069 = 1; *(uint8_t*)0x20000000006a = 0x22; *(uint16_t*)0x20000000006b = 0x29; *(uint8_t*)0x20000000006d = 9; *(uint8_t*)0x20000000006e = 5; *(uint8_t*)0x20000000006f = 0x81; *(uint8_t*)0x200000000070 = 3; *(uint16_t*)0x200000000071 = 0; *(uint8_t*)0x200000000073 = 0; *(uint8_t*)0x200000000074 = 0; *(uint8_t*)0x200000000075 = 0; res = -1; res = syz_usb_connect(/*speed=*/0, /*dev_len=*/0x36, /*dev=*/0x200000000040, /*conn_descs=*/0); if (res != -1) r[0] = res; syz_usb_control_io(/*fd=*/r[0], /*descs=*/0, /*resps=*/0); syscall(__NR_prctl, /*option=*/0x26ul, /*arg=*/1ul, 0, 0, 0); *(uint32_t*)0x200000000000 = 0x2c; *(uint64_t*)0x200000000004 = 0x2000000000c0; memcpy((void*)0x2000000000c0, "\x40\x0c\x2a\x00\x00\x00\x2a\x22\x5f\xab\xe9\x36\x24\xdb\xb2\x2d\x8b\x5a\xc8\x50\x1c\x70\x40\xb2\xad\xcf\x1f\xb3\xab\x7e\xd1\x6b\xbb\xbf\xa2\xa0\x80\x2a\x9e\x3f\x78\x95\xe5\x90\x2e\xdd\xcb\x54", 48); *(uint64_t*)0x20000000000c = 0; *(uint64_t*)0x200000000014 = 0; *(uint64_t*)0x20000000001c = 0; *(uint64_t*)0x200000000024 = 0; syz_usb_control_io(/*fd=*/r[0], /*descs=*/0x200000000000, /*resps=*/0);
} int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; loop(); return 0; }
I hope it helps. Best regards Jianzhou Zhao Penglei Jiang