| 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-2021-47457: can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible() |
| |
| Using wait_event_interruptible() to wait for complete transmission, |
| but do not check the result of wait_event_interruptible() which can be |
| interrupted. It will result in TX buffer has multiple accessors and |
| the later process interferes with the previous process. |
| |
| Following is one of the problems reported by syzbot. |
| |
| ============================================================= |
| WARNING: CPU: 0 PID: 0 at net/can/isotp.c:840 isotp_tx_timer_handler+0x2e0/0x4c0 |
| CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc7+ #68 |
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 |
| RIP: 0010:isotp_tx_timer_handler+0x2e0/0x4c0 |
| Call Trace: |
| <IRQ> |
| ? isotp_setsockopt+0x390/0x390 |
| __hrtimer_run_queues+0xb8/0x610 |
| hrtimer_run_softirq+0x91/0xd0 |
| ? rcu_read_lock_sched_held+0x4d/0x80 |
| __do_softirq+0xe8/0x553 |
| irq_exit_rcu+0xf8/0x100 |
| sysvec_apic_timer_interrupt+0x9e/0xc0 |
| </IRQ> |
| asm_sysvec_apic_timer_interrupt+0x12/0x20 |
| |
| Add result check for wait_event_interruptible() in isotp_sendmsg() |
| to avoid multiple accessers for tx buffer. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47457 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10 with commit e057dd3fc20ffb3d7f150af46542a51b59b90127 and fixed in 5.10.76 with commit 053bc12df0d6097c1126d0e14fa778a0a8faeb64 |
| Issue introduced in 5.10 with commit e057dd3fc20ffb3d7f150af46542a51b59b90127 and fixed in 5.14.15 with commit a76abedd2be3926d6deba236a935c7f98abf9110 |
| Issue introduced in 5.10 with commit e057dd3fc20ffb3d7f150af46542a51b59b90127 and fixed in 5.15 with commit 9acf636215a6ce9362fe618e7da4913b8bfe84c8 |
| |
| 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-2021-47457 |
| 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: |
| net/can/isotp.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/053bc12df0d6097c1126d0e14fa778a0a8faeb64 |
| https://git.kernel.org/stable/c/a76abedd2be3926d6deba236a935c7f98abf9110 |
| https://git.kernel.org/stable/c/9acf636215a6ce9362fe618e7da4913b8bfe84c8 |
