| 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-2024-38576: rcu: Fix buffer overflow in print_cpu_stall_info() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| rcu: Fix buffer overflow in print_cpu_stall_info() |
| |
| The rcuc-starvation output from print_cpu_stall_info() might overflow the |
| buffer if there is a huge difference in jiffies difference. The situation |
| might seem improbable, but computers sometimes get very confused about |
| time, which can result in full-sized integers, and, in this case, |
| buffer overflow. |
| |
| Also, the unsigned jiffies difference is printed using %ld, which is |
| normally for signed integers. This is intentional for debugging purposes, |
| but it is not obvious from the code. |
| |
| This commit therefore changes sprintf() to snprintf() and adds a |
| clarifying comment about intention of %ld format. |
| |
| Found by Linux Verification Center (linuxtesting.org) with SVACE. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38576 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit 245a62982502255314b63dd2c4daaedd1cd595a6 and fixed in 6.1.93 with commit e2228ed3fe7aa838fba87c79a76fb1ad9ea47138 |
| Issue introduced in 6.0 with commit 245a62982502255314b63dd2c4daaedd1cd595a6 and fixed in 6.6.33 with commit afb39909bfb5c08111f99e21bf5be7505f59ff1c |
| Issue introduced in 6.0 with commit 245a62982502255314b63dd2c4daaedd1cd595a6 and fixed in 6.8.12 with commit 9351e1338539cb7f319ffc1210fa9b2aa27384b5 |
| Issue introduced in 6.0 with commit 245a62982502255314b63dd2c4daaedd1cd595a6 and fixed in 6.9.3 with commit 4c3e2ef4d8ddd313c8ce3ac30505940bea8d6257 |
| Issue introduced in 6.0 with commit 245a62982502255314b63dd2c4daaedd1cd595a6 and fixed in 6.10 with commit 3758f7d9917bd7ef0482c4184c0ad673b4c4e069 |
| |
| 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-2024-38576 |
| 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/rcu/tree_stall.h |
| |
| |
| 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/e2228ed3fe7aa838fba87c79a76fb1ad9ea47138 |
| https://git.kernel.org/stable/c/afb39909bfb5c08111f99e21bf5be7505f59ff1c |
| https://git.kernel.org/stable/c/9351e1338539cb7f319ffc1210fa9b2aa27384b5 |
| https://git.kernel.org/stable/c/4c3e2ef4d8ddd313c8ce3ac30505940bea8d6257 |
| https://git.kernel.org/stable/c/3758f7d9917bd7ef0482c4184c0ad673b4c4e069 |
