| 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-2021-46922: KEYS: trusted: Fix TPM reservation for seal/unseal |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| KEYS: trusted: Fix TPM reservation for seal/unseal |
| |
| The original patch 8c657a0590de ("KEYS: trusted: Reserve TPM for seal |
| and unseal operations") was correct on the mailing list: |
| |
| https://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/ |
| |
| But somehow got rebased so that the tpm_try_get_ops() in |
| tpm2_seal_trusted() got lost. This causes an imbalanced put of the |
| TPM ops and causes oopses on TIS based hardware. |
| |
| This fix puts back the lost tpm_try_get_ops() |
| |
| The Linux kernel CVE team has assigned CVE-2021-46922 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10.20 with commit 67118bb78d72aab5b831f054a74ae856339a1974 and fixed in 5.10.33 with commit bf84ef2dd2ccdcd8f2658476d34b51455f970ce4 |
| Issue introduced in 5.11.3 with commit 498b8fc1cdc13b57b02dd28544b18323900fae10 and fixed in 5.11.17 with commit 39c8d760d44cb3fa0d67e8cd505df81cf4d80999 |
| |
| 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-2021-46922 |
| 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: |
| security/keys/trusted-keys/trusted_tpm2.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/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4 |
| https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999 |
| https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20 |
