| 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-2021-47360: binder: make sure fd closes complete |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| binder: make sure fd closes complete |
| |
| During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object |
| cleanup may close 1 or more fds. The close operations are |
| completed using the task work mechanism -- which means the thread |
| needs to return to userspace or the file object may never be |
| dereferenced -- which can lead to hung processes. |
| |
| Force the binder thread back to userspace if an fd is closed during |
| BC_FREE_BUFFER handling. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47360 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.0 with commit 80cd795630d6526ba729a089a435bf74a57af927 and fixed in 5.4.150 with commit aa2c274c279ff365a06a4cba263f04965895166e |
| Issue introduced in 5.0 with commit 80cd795630d6526ba729a089a435bf74a57af927 and fixed in 5.10.70 with commit d5b0473707fa53b03a5db0256ce62b2874bddbc7 |
| Issue introduced in 5.0 with commit 80cd795630d6526ba729a089a435bf74a57af927 and fixed in 5.14.9 with commit b95483d8d94b41fa31a84c1d86710b7907a37621 |
| Issue introduced in 5.0 with commit 80cd795630d6526ba729a089a435bf74a57af927 and fixed in 5.15 with commit 5fdb55c1ac9585eb23bb2541d5819224429e103d |
| Issue introduced in 4.20.1 with commit 27564d8d5d12d2ff197055346069c6bdbe08a8c2 |
| |
| 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-2021-47360 |
| 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/android/binder.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/aa2c274c279ff365a06a4cba263f04965895166e |
| https://git.kernel.org/stable/c/d5b0473707fa53b03a5db0256ce62b2874bddbc7 |
| https://git.kernel.org/stable/c/b95483d8d94b41fa31a84c1d86710b7907a37621 |
| https://git.kernel.org/stable/c/5fdb55c1ac9585eb23bb2541d5819224429e103d |
