CVE-2023-52894

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()

In Google internal bug 265639009 weve received an (as yet) unreproducible crash report from an aarch64 GKI 5.10.149-android13 running device.

AFAICT the source code is at: https://android.googlesource.com/kernel/common/+/refs/tags/ASB-2022-12-05_13-5.10

The call stack is: ncm_close() -> ncm_notify() -> ncm_do_notify() with the crash at: ncm_do_notify+0x98/0x270 Code: 79000d0b b9000a6c f940012a f9400269 (b9405d4b)

Which I believe disassembles to (I dont know ARM assembly, but it looks sane enough to me…):

// halfword (16-bit) store presumably to event->wLength (at offset 6 of struct usb_cdc_notification) 0B 0D 00 79 strh w11, [x8, #6]

// word (32-bit) store presumably to req->Length (at offset 8 of struct usb_request) 6C 0A 00 B9 str w12, [x19, #8]

// x10 (NULL) was read here from offset 0 of valid pointer x9 // IMHO were reading cdev->gadget and getting NULL // gadget is indeed at offset 0 of struct usb_composite_dev 2A 01 40 F9 ldr x10, [x9]

// loading req->buf pointer, which is at offset 0 of struct usb_request 69 02 40 F9 ldr x9, [x19]

// x10 is null, crash, appears to be attempt to read cdev->gadget->max_speed 4B 5D 40 B9 ldr w11, [x10, #0x5c]

which seems to line up with ncm_do_notify() case NCM_NOTIFY_SPEED code fragment:

event->wLength = cpu_to_le16(8); req->length = NCM_STATUS_BYTECOUNT;

/* SPEED_CHANGE data is up/down speeds in bits/sec */ data = req->buf + sizeof *event; data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));

My analysis of registers and NULL ptr deref crash offset (Unable to handle kernel NULL pointer dereference at virtual address 000000000000005c) heavily suggests that the crash is due to cdev->gadget being NULL when executing: data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget)); which calls: ncm_bitrate(NULL) which then calls: gadget_is_superspeed(NULL) which reads ((struct usb_gadget *)NULL)->max_speed and hits a panic.

AFAICT, if Im counting right, the offset of max_speed is indeed 0x5C. (remember theres a GKI KABI reservation of 16 bytes in struct work_struct)

Its not at all clear to me how this is all supposed to work… but returning 0 seems much better than panic-ing…

Weakness

The product dereferences a pointer that it expects to be valid but is NULL.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/09e4507ec8ef2d44da6ba4092b8ee2d81f216497
• https://git.kernel.org/stable/c/63d161f29cd39c050e8873aa36e0c9fc013bb763
• https://git.kernel.org/stable/c/a21da7f7aae618c785f7e4a275d43c06dc8412b6
• https://git.kernel.org/stable/c/a69c8dfb85b44be9cc223be07d35cc3a9baefbea
• https://git.kernel.org/stable/c/c6ec929595c7443250b2a4faea988c62019d5cd2
• https://git.kernel.org/stable/c/e92c70059178da751e5af7de02384b7dfadb5ec7
• https://git.kernel.org/stable/c/fef6b29671b66dfb71f17e337c1ad14b5a2cedae