| 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-2023-52980: block: ublk: extending queue_size to fix overflow |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| block: ublk: extending queue_size to fix overflow |
| |
| When validating drafted SPDK ublk target, in a case that |
| assigning large queue depth to multiqueue ublk device, |
| ublk target would run into a weird incorrect state. During |
| rounds of review and debug, An overflow bug was found |
| in ublk driver. |
| |
| In ublk_cmd.h, UBLK_MAX_QUEUE_DEPTH is 4096 which means |
| each ublk queue depth can be set as large as 4096. But |
| when setting qd for a ublk device, |
| sizeof(struct ublk_queue) + depth * sizeof(struct ublk_io) |
| will be larger than 65535 if qd is larger than 2728. |
| Then queue_size is overflowed, and ublk_get_queue() |
| references a wrong pointer position. The wrong content of |
| ublk_queue elements will lead to out-of-bounds memory |
| access. |
| |
| Extend queue_size in ublk_device as "unsigned int". |
| |
| The Linux kernel CVE team has assigned CVE-2023-52980 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit 71f28f3136aff5890cd56de78abc673f8393cad9 and fixed in 6.1.11 with commit ee1e3fe4b4579f856997190a00ea4db0307b4332 |
| Issue introduced in 6.0 with commit 71f28f3136aff5890cd56de78abc673f8393cad9 and fixed in 6.2 with commit 29baef789c838bd5c02f50c88adbbc6b955aaf61 |
| |
| 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-2023-52980 |
| 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/block/ublk_drv.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/ee1e3fe4b4579f856997190a00ea4db0307b4332 |
| https://git.kernel.org/stable/c/29baef789c838bd5c02f50c88adbbc6b955aaf61 |
