| 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-2021-47153: i2c: i801: Don't generate an interrupt on bus reset |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| i2c: i801: Don't generate an interrupt on bus reset |
| |
| Now that the i2c-i801 driver supports interrupts, setting the KILL bit |
| in a attempt to recover from a timed out transaction triggers an |
| interrupt. Unfortunately, the interrupt handler (i801_isr) is not |
| prepared for this situation and will try to process the interrupt as |
| if it was signaling the end of a successful transaction. In the case |
| of a block transaction, this can result in an out-of-range memory |
| access. |
| |
| This condition was reproduced several times by syzbot: |
| https://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e |
| https://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e |
| https://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e |
| https://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb |
| https://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a |
| https://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79 |
| |
| So disable interrupts while trying to reset the bus. Interrupts will |
| be enabled again for the following transaction. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47153 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 4.4.271 with commit f9469082126cebb7337db3992d143f5e4edfe629 |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 4.9.271 with commit 09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3 |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 4.14.235 with commit dfa8929e117b0228a7765f5c3f5988a4a028f3c6 |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 4.19.193 with commit c70e1ba2e7e65255a0ce004f531dd90dada97a8c |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 5.4.124 with commit 04cc05e3716ae31b17ecdab7bc55c8170def1b8b |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 5.10.42 with commit b523feb7e8e44652f92f3babb953a976e7ccbbef |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 5.12.9 with commit 1f583d3813f204449037cd2acbfc09168171362a |
| Issue introduced in 3.6 with commit 636752bcb5177a301d0266270661581de8624828 and fixed in 5.13 with commit e4d8716c3dcec47f1557024add24e1f3c09eb24b |
| |
| 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-2021-47153 |
| 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/i2c/busses/i2c-i801.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/f9469082126cebb7337db3992d143f5e4edfe629 |
| https://git.kernel.org/stable/c/09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3 |
| https://git.kernel.org/stable/c/dfa8929e117b0228a7765f5c3f5988a4a028f3c6 |
| https://git.kernel.org/stable/c/c70e1ba2e7e65255a0ce004f531dd90dada97a8c |
| https://git.kernel.org/stable/c/04cc05e3716ae31b17ecdab7bc55c8170def1b8b |
| https://git.kernel.org/stable/c/b523feb7e8e44652f92f3babb953a976e7ccbbef |
| https://git.kernel.org/stable/c/1f583d3813f204449037cd2acbfc09168171362a |
| https://git.kernel.org/stable/c/e4d8716c3dcec47f1557024add24e1f3c09eb24b |
