| 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-2021-47018: powerpc/64: Fix the definition of the fixmap area |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| powerpc/64: Fix the definition of the fixmap area |
| |
| At the time being, the fixmap area is defined at the top of |
| the address space or just below KASAN. |
| |
| This definition is not valid for PPC64. |
| |
| For PPC64, use the top of the I/O space. |
| |
| Because of circular dependencies, it is not possible to include |
| asm/fixmap.h in asm/book3s/64/pgtable.h , so define a fixed size |
| AREA at the top of the I/O space for fixmap and ensure during |
| build that the size is big enough. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47018 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.5 with commit 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 and fixed in 5.10.37 with commit 4b9fb2c9039a206d37f215936a4d5bee7b1bf9cd |
| Issue introduced in 5.5 with commit 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 and fixed in 5.11.21 with commit abb07dc5e8b61ab7b1dde20dd73aa01a3aeb183f |
| Issue introduced in 5.5 with commit 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 and fixed in 5.12.4 with commit a84df7c80bdac598d6ac9268ae578da6928883e8 |
| Issue introduced in 5.5 with commit 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 and fixed in 5.13 with commit 9ccba66d4d2aff9a3909aa77d57ea8b7cc166f3c |
| |
| 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-2021-47018 |
| 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: |
| arch/powerpc/include/asm/book3s/64/pgtable.h |
| arch/powerpc/include/asm/fixmap.h |
| arch/powerpc/include/asm/nohash/64/pgtable.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/4b9fb2c9039a206d37f215936a4d5bee7b1bf9cd |
| https://git.kernel.org/stable/c/abb07dc5e8b61ab7b1dde20dd73aa01a3aeb183f |
| https://git.kernel.org/stable/c/a84df7c80bdac598d6ac9268ae578da6928883e8 |
| https://git.kernel.org/stable/c/9ccba66d4d2aff9a3909aa77d57ea8b7cc166f3c |
