| 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-2021-46940: tools/power turbostat: Fix offset overflow issue in index converting |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| tools/power turbostat: Fix offset overflow issue in index converting |
| |
| The idx_to_offset() function returns type int (32-bit signed), but |
| MSR_PKG_ENERGY_STAT is u32 and would be interpreted as a negative number. |
| The end result is that it hits the if (offset < 0) check in update_msr_sum() |
| which prevents the timer callback from updating the stat in the background when |
| long durations are used. The similar issue exists in offset_to_idx() and |
| update_msr_sum(). Fix this issue by converting the 'int' to 'off_t' accordingly. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46940 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10 with commit 9972d5d84d76982606806b2ce887f70c2f8ba60a and fixed in 5.10.36 with commit ea6803ff2cd1a2d7d880256bf562172b708a76ff |
| Issue introduced in 5.10 with commit 9972d5d84d76982606806b2ce887f70c2f8ba60a and fixed in 5.11.20 with commit dbdf22fc825fdb1d97f23230064e0f9819471628 |
| Issue introduced in 5.10 with commit 9972d5d84d76982606806b2ce887f70c2f8ba60a and fixed in 5.12.3 with commit 337b1546cde87fb8588ddaedf0201b769baa572a |
| Issue introduced in 5.10 with commit 9972d5d84d76982606806b2ce887f70c2f8ba60a and fixed in 5.13 with commit 13a779de4175df602366d129e41782ad7168cef0 |
| |
| 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-2021-46940 |
| 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: |
| tools/power/x86/turbostat/turbostat.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/ea6803ff2cd1a2d7d880256bf562172b708a76ff |
| https://git.kernel.org/stable/c/dbdf22fc825fdb1d97f23230064e0f9819471628 |
| https://git.kernel.org/stable/c/337b1546cde87fb8588ddaedf0201b769baa572a |
| https://git.kernel.org/stable/c/13a779de4175df602366d129e41782ad7168cef0 |
