Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: comedi: comedi_parport: deal with premature interrupt Syzbot reported a general protection fault in `comedi_get_is_subdevice_running()`, which was called from the interrupt handler `parport_interrupt()` in the "comedi_parport" driver, but it does not currently have a C reproducer for the problem. It's probably due to a premature interrupt for one of two reasons: 1. The driver sets up the interrupt handler before the comedi subdevices used by the interrupt handler have been allocated, but does not disable the interrupt in the parallel port's CTRL register first. 2. The driver uses a user-supplied I/O port base address which Syzbot would have supplied, but it might not be backed by real parallel port hardware. Change the initialization order in the driver's comedi "attach" handler (`parport_attach()`) so that the hardware registers are initialized before the interrupt handler is requested. This should prevent premature interrupts occurring for real hardware. Also add a test to the interrupt handler to ensure the comedi device is fully attached and return early if it isn't.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before 6ed34611e569fc1a1169905c5228fd0eb2806c1b; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before 48ef18e5eb6b8a9c546038b2ab89a841fcd97fe7; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before a88b25db815ff6edace81b0bb0f4a201133bd215; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before b061bb4dca49fd93063359d3805387235818778c; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before 086a9ae3c5df63ec11033a8c0b3f6a1fd295ddd1; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before cf26dd2d841583c54a87005c4934b92fddb930c3; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before 5d059ce0e6a2f6f8b97273499d47b8f917097b48; affected 241ab6ad7108e51c67881f7881c5e46f0400cdb1 before 17221216ae8ce6a24e8a4e787382e3ebc81b88a8 |
| Linux / Linux | affected 2.6.29; unaffected 0 before 2.6.29; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6ed34611e569fc1a1169905c5228fd0eb2806c1b
- https://git.kernel.org/stable/c/48ef18e5eb6b8a9c546038b2ab89a841fcd97fe7
- https://git.kernel.org/stable/c/a88b25db815ff6edace81b0bb0f4a201133bd215
- https://git.kernel.org/stable/c/b061bb4dca49fd93063359d3805387235818778c
- https://git.kernel.org/stable/c/086a9ae3c5df63ec11033a8c0b3f6a1fd295ddd1
- https://git.kernel.org/stable/c/cf26dd2d841583c54a87005c4934b92fddb930c3
- https://git.kernel.org/stable/c/5d059ce0e6a2f6f8b97273499d47b8f917097b48
- https://git.kernel.org/stable/c/17221216ae8ce6a24e8a4e787382e3ebc81b88a8