Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tty: serial: samsung: Remove redundant port lock acquisition in rx helpers Sashiko identified a deadlock when the console flow is engaged [1]. When console flow control is enabled (UPF_CONS_FLOW), s3c24xx_serial_stop_tx() calls s3c24xx_serial_rx_enable() and s3c24xx_serial_start_tx() calls s3c24xx_serial_rx_disable(). The serial core framework invokes the .stop_tx() and .start_tx() callbacks with the port->lock spinlock already held. Furthermore, all internal driver paths that invoke stop_tx (such as the DMA TX completion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ handler s3c24xx_serial_tx_irq()) also acquire port->lock prior to calling it. (Note that s3c24xx_serial_start_tx() is only invoked by the serial core). However, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable() unconditionally attempt to acquire port->lock again using uart_port_lock_irqsave(). Since spinlocks are not recursive, this causes a deadlock on the same CPU when console flow control is engaged. Remove the redundant lock acquisition from both rx helper functions.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before ee9eb72be95490602c493db050c73d925c3a4d74; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before 10014eb7eee351f7b587f8ac85830f0c9343cb9a; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before f4c3e63fa8639aedf96fb200d9939945a9eed51e; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before a9c22e0f93ba18322a6623ecdda2f0cd858ca350; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before 14143ec10d69f42806b5d7b046f0fd1b835831ae; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before 9fd48937046efc9abb89379d63ee9cc5c661d711; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before 9c92b42207978559e32903c3098aaf5c5b5788b2; affected b497549a035c2a81b71c7a27f2b00c8a16c09423 before a3bb136bff5e6a5e48cdd813246c9c4686feaaa9 |
| Linux / Linux | affected 2.6.27; unaffected 0 before 2.6.27; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.143 through 6.6.*; unaffected 6.12.93 through 6.12.*; unaffected 6.18.35 through 6.18.*; unaffected 7.0.12 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74
- https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a
- https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e
- https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350
- https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae
- https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711
- https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2
- https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9