| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47368: enetc: Fix illegal access when reading affinity_hint |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| enetc: Fix illegal access when reading affinity_hint |
| |
| irq_set_affinity_hit() stores a reference to the cpumask_t |
| parameter in the irq descriptor, and that reference can be |
| accessed later from irq_affinity_hint_proc_show(). Since |
| the cpu_mask parameter passed to irq_set_affinity_hit() has |
| only temporary storage (it's on the stack memory), later |
| accesses to it are illegal. Thus reads from the corresponding |
| procfs affinity_hint file can result in paging request oops. |
| |
| The issue is fixed by the get_cpu_mask() helper, which provides |
| a permanent storage for the cpumask_t parameter. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47368 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.1 with commit d4fd0404c1c95b17880f254ebfee3485693fa8ba and fixed in 5.4.150 with commit 4c4c3052911b577920353a7646e4883d5da40c28 |
| Issue introduced in 5.1 with commit d4fd0404c1c95b17880f254ebfee3485693fa8ba and fixed in 5.10.70 with commit 6c3f1b741c6c2914ea120e3a5790d3e900152f7b |
| Issue introduced in 5.1 with commit d4fd0404c1c95b17880f254ebfee3485693fa8ba and fixed in 5.14.9 with commit 6f329d9da2a5ae032fcde800a99b118124ed5270 |
| Issue introduced in 5.1 with commit d4fd0404c1c95b17880f254ebfee3485693fa8ba and fixed in 5.15 with commit 7237a494decfa17d0b9d0076e6cee3235719de90 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47368 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/net/ethernet/freescale/enetc/enetc.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28 |
| https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b |
| https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270 |
| https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90 |
