Description
In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
9879e1bec3c0f077427dd0d258c80c63ce9babdf to < 2a0ba376cdf729b5c66226c65c6c7cf9de744d52affected4409df5866b7ff7686ba27e449ca97a92ee063c9 to < 09cfe05e9907f3276887a20e267cc40e202f4fddaffected4409df5866b7ff7686ba27e449ca97a92ee063c9 to < 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4affected4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68affecteddbe196ca489f3833e0f9eeb86ac346194f131c91affected6.6.15 to < 6.6.160affected6.1.76 to < 6.2affected6.7.3 to < 6.8affected
Linux Linux
Default version status: affected
6.8affected0 to < 6.8unaffected6.6.160 to ≤ 6.6.*unaffected6.10.5 to ≤ 6.10.*unaffected6.11 to ≤ *unaffected