CVE-2022-50239

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: qcom: fix writes in read-only memory region

This commit fixes a kernel oops because of a write in some read-only memory:

[ 9.068287] Unable to handle kernel write to read-only memory at virtual address ffff800009240ad8

..snip..

[ 9.138790] Internal error: Oops: 9600004f [#1] PREEMPT SMP

..snip..

[ 9.269161] Call trace:

[ 9.276271] __memcpy+0x5c/0x230

[ 9.278531] snprintf+0x58/0x80

[ 9.282002] qcom_cpufreq_msm8939_name_version+0xb4/0x190

[ 9.284869] qcom_cpufreq_probe+0xc8/0x39c

..snip..

The following line defines a pointer that point to a char buffer stored

in read-only memory:

char *pvs_name = "speedXX-pvsXX-vXX";

This pointer is meant to hold a template "speedXX-pvsXX-vXX" where the

XX values get overridden by the qcom_cpufreq_krait_name_version function. Since

the template is actually stored in read-only memory, when the function

executes the following call we get a

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References