| 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-2024-43862: net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex |
| |
| The carrier_lock spinlock protects the carrier detection. While it is |
| held, framer_get_status() is called which in turn takes a mutex. |
| This is not correct and can lead to a deadlock. |
| |
| A run with PROVE_LOCKING enabled detected the issue: |
| [ BUG: Invalid wait context ] |
| ... |
| c204ddbc (&framer->mutex){+.+.}-{3:3}, at: framer_get_status+0x40/0x78 |
| other info that might help us debug this: |
| context-{4:4} |
| 2 locks held by ifconfig/146: |
| #0: c0926a38 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x12c/0x664 |
| #1: c2006a40 (&qmc_hdlc->carrier_lock){....}-{2:2}, at: qmc_hdlc_framer_set_carrier+0x30/0x98 |
| |
| Avoid the spinlock usage and convert carrier_lock to a mutex. |
| |
| The Linux kernel CVE team has assigned CVE-2024-43862 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.9 with commit 54762918ca856028d33d1d56d017a4d7706c6196 and fixed in 6.10.4 with commit f223d2b4acb7a45a6e0581cb380e1af1a6dc7ab9 |
| Issue introduced in 6.9 with commit 54762918ca856028d33d1d56d017a4d7706c6196 and fixed in 6.11 with commit c4d6a347ba7babdf9d90a0eb24048c266cae0532 |
| |
| 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-2024-43862 |
| 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/wan/fsl_qmc_hdlc.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/f223d2b4acb7a45a6e0581cb380e1af1a6dc7ab9 |
| https://git.kernel.org/stable/c/c4d6a347ba7babdf9d90a0eb24048c266cae0532 |
