Description
In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: convert from _raw_ to _noinc_ regmap functions for FIFO The SC16IS7XX IC supports a burst mode to access the FIFOs where the initial register address is sent ($00), followed by all the FIFO data without having to resend the register address each time. In this mode, the IC doesn't increment the register address for each R/W byte. The regmap_raw_read() and regmap_raw_write() are functions which can perform IO over multiple registers. They are currently used to read/write from/to the FIFO, and although they operate correctly in this burst mode on the SPI bus, they would corrupt the regmap cache if it was not disabled manually. The reason is that when the R/W size is more than 1 byte, these functions assume that the register address is incremented and handle the cache accordingly. Convert FIFO R/W functions to use the regmap _noinc_ versions in order to remove the manual cache control which was a workaround when using the _raw_ versions. FIFO registers are properly declared as volatile so cache will not be used/updated for FIFO accesses.
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
dfeae619d781dee61666d5551b93ba3be755a86b to < 4e37416e4ee1b1bc17364a68973e0c63be89e611affecteddfeae619d781dee61666d5551b93ba3be755a86b to < e635f652696ef6f1230621cfd89c350cb5ec6169affecteddfeae619d781dee61666d5551b93ba3be755a86b to < 416b10d2817c94db86829fb92ad43ce7d002c573affecteddfeae619d781dee61666d5551b93ba3be755a86b to < 084c24e788d9cf29c55564de368bf5284f2bb5dbaffecteddfeae619d781dee61666d5551b93ba3be755a86b to < aa7cb4787698add9367b19f7afc667662c9bdb23affecteddfeae619d781dee61666d5551b93ba3be755a86b to < dbf4ab821804df071c8b566d9813083125e6d97baffected
Linux Linux
Default version status: affected
3.16affected0 to < 3.16unaffected5.10.215 to ≤ 5.10.*unaffected5.15.154 to ≤ 5.15.*unaffected6.1.76 to ≤ 6.1.*unaffected6.6.15 to ≤ 6.6.*unaffected6.7.3 to ≤ 6.7.*unaffected6.8 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/4e37416e4ee1b1bc17364a68973e0c63be89e611 ↗
- https://git.kernel.org/stable/c/e635f652696ef6f1230621cfd89c350cb5ec6169 ↗
- https://git.kernel.org/stable/c/416b10d2817c94db86829fb92ad43ce7d002c573 ↗
- https://git.kernel.org/stable/c/084c24e788d9cf29c55564de368bf5284f2bb5db ↗
- https://git.kernel.org/stable/c/aa7cb4787698add9367b19f7afc667662c9bdb23 ↗
- https://git.kernel.org/stable/c/dbf4ab821804df071c8b566d9813083125e6d97b ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html ↗