APPLIED: [SRU][F][PATCH 0/1] CVE-2023-52488

[Stefan Bader]

On 21.10.24 19:02, Jacob Martin wrote:
> [Impact]
> 
> The sc16is7xx driver uses regmap_raw_read and regmap_raw_write to access the
> IC's FIFOs in a burst mode that doesn't increment the register address for each
> byte. The functions regmap_raw_read and regmap_raw_write assume that the
> register's address *is* incremented, update the regmap cache accordingly, and
> thus would end up corrupting it. The driver works around this by disabling the
> regmap cache while calling these functions. Fully resolve the issue by using
> the regmap_noinc_read and regmap_noinc_write functions, which correctly assume
> the register's address *is not* incremented.
> 
> [Fix]
> 
> Noble: Not affected
> Jammy: Fix released
> Focal: Backport from linux-5.10.y stable branch, context adjustments
> Bionic: Patchset sent to ESM list
> Xenial: Patchset sent to ESM list
> Trusty: Not affected
> 
> [Test Case]
> 
> Compile tested.
> 
> [Where problems could occur]
> 
> This change modifies the FIFO read/write behavior of the sc16is7xx driver.
> Issues with the fix would cause TTY serial connections utilizing the driver to
> misbehave.
> 
> Hugo Villeneuve (1):
>    serial: sc16is7xx: convert from _raw_ to _noinc_ regmap functions for
>      FIFO
> 
>   drivers/tty/serial/sc16is7xx.c | 15 +++++++++------
>   1 file changed, 9 insertions(+), 6 deletions(-)
> 

Applied to focal:linux/master-next. Thanks.

-Stefan

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