Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool() Commit 2e4955167ec5 ("firmware: qcom: scm: Fix __scm and waitq completion variable initialization") introduced a write barrier in probe function to store global '__scm' variable. We all known barriers are paired (see memory-barriers.txt: "Note that write barriers should normally be paired with read or address-dependency barriers"), therefore accessing it from concurrent contexts requires read barrier. Previous commit added such barrier in qcom_scm_is_available(), so let's use that directly. Lack of this read barrier can result in fetching stale '__scm' variable value, NULL, and dereferencing it. Note that barrier in qcom_scm_is_available() satisfies here the control dependency.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 449d0d84bcd8246b508d07995326d13c54488b8c before fee921e3c641f64185abee83f9a6e65f0b380682; affected 449d0d84bcd8246b508d07995326d13c54488b8c before e03db7c1255ebabba5e1a447754faeb138de15a2; affected 449d0d84bcd8246b508d07995326d13c54488b8c before b628510397b5cafa1f5d3e848a28affd1c635302 |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 6.12.14 through 6.12.*; unaffected 6.13.3 through 6.13.*; unaffected 6.14 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/fee921e3c641f64185abee83f9a6e65f0b380682
- https://git.kernel.org/stable/c/e03db7c1255ebabba5e1a447754faeb138de15a2
- https://git.kernel.org/stable/c/b628510397b5cafa1f5d3e848a28affd1c635302
ADP enrichment
No English description supplied.
No references supplied.