Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: Fix use-after-free bug by not setting udc->dev.driver The syzbot fuzzer found a use-after-free bug: BUG: KASAN: use-after-free in dev_uevent+0x712/0x780 drivers/base/core.c:2320 Read of size 8 at addr ffff88802b934098 by task udevd/3689 CPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 dev_uevent+0x712/0x780 drivers/base/core.c:2320 uevent_show+0x1b8/0x380 drivers/base/core.c:2391 dev_attr_show+0x4b/0x90 drivers/base/core.c:2094 Although the bug manifested in the driver core, the real cause was a race with the gadget core. dev_uevent() does: if (dev->driver) add_uevent_var(env, "DRIVER=%s", dev->driver->name); and between the test and the dereference of dev->driver, the gadget core sets dev->driver to NULL. The race wouldn't occur if the gadget core registered its devices on a real bus, using the standard synchronization techniques of the driver core. However, it's not necessary to make such a large change in order to fix this bug; all we need to do is make sure that udc->dev.driver is always NULL. In fact, there is no reason for udc->dev.driver ever to be set to anything, let alone to the value it currently gets: the address of the gadget's driver. After all, a gadget driver only knows how to manage a gadget, not how to manage a UDC. This patch simply removes the statements in the gadget core that touch udc->dev.driver.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 4325124dde6726267813c736fee61226f1d38f0b; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before e2d3a7009e505e120805f449c832942660f3f7f3; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 609a7119bffe3ddd7c93f2fa65be8917e02a0b7e; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 2282a6eb6d4e118e294e43dcc421e0e0fe4040b5; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 00bdd9bf1ac6d401ad926d3d8df41b9f1399f646; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 2015c23610cd0efadaeca4d3a8d1dae9a45aa35a; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 27d64436984fb8835a8b7e95993193cc478b162e; affected 2ccea03a8f7ec93641791f2760d7cdc6cab6205f before 16b1941eac2bd499f065a6739a40ce0011a3d740 |
| Linux / Linux | affected 3.1; unaffected 0 before 3.1; unaffected 4.9.308 through 4.9.*; unaffected 4.14.273 through 4.14.*; unaffected 4.19.236 through 4.19.*; unaffected 5.4.187 through 5.4.*; unaffected 5.10.108 through 5.10.*; unaffected 5.15.31 through 5.15.*; unaffected 5.16.17 through 5.16.*; unaffected 5.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0b
- https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3
- https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7e
- https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5
- https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646
- https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35a
- https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162e
- https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0b
- https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3
- https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7e
- https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5
- https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646
- https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35a
- https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162e
- https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740
No English description supplied.
No references supplied.