| 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-2022-49709: cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle |
| |
| RCU_NONIDLE usage during __cfi_slowpath_diag can result in an invalid |
| RCU state in the cpuidle code path: |
| |
| WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:613 rcu_eqs_enter+0xe4/0x138 |
| ... |
| Call trace: |
| rcu_eqs_enter+0xe4/0x138 |
| rcu_idle_enter+0xa8/0x100 |
| cpuidle_enter_state+0x154/0x3a8 |
| cpuidle_enter+0x3c/0x58 |
| do_idle.llvm.6590768638138871020+0x1f4/0x2ec |
| cpu_startup_entry+0x28/0x2c |
| secondary_start_kernel+0x1b8/0x220 |
| __secondary_switched+0x94/0x98 |
| |
| Instead, call rcu_irq_enter/exit to wake up RCU only when needed and |
| disable interrupts for the entire CFI shadow/module check when we do. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49709 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit cf68fffb66d60d96209446bfc4a15291dc5a5d41 and fixed in 5.15.49 with commit 75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5ed |
| Issue introduced in 5.13 with commit cf68fffb66d60d96209446bfc4a15291dc5a5d41 and fixed in 5.18.6 with commit ca3897f2ac02ceae5e6fa794f83c36f9885b93da |
| Issue introduced in 5.13 with commit cf68fffb66d60d96209446bfc4a15291dc5a5d41 and fixed in 5.19 with commit 57cd6d157eb479f0a8e820fd36b7240845c8a937 |
| |
| 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-2022-49709 |
| 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: |
| kernel/cfi.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/75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5ed |
| https://git.kernel.org/stable/c/ca3897f2ac02ceae5e6fa794f83c36f9885b93da |
| https://git.kernel.org/stable/c/57cd6d157eb479f0a8e820fd36b7240845c8a937 |
