| 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-2024-44965: x86/mm: Fix pti_clone_pgtable() alignment assumption |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| x86/mm: Fix pti_clone_pgtable() alignment assumption |
| |
| Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 |
| that had the form of endless traps until entry stack exhaust and then |
| #DF from the stack guard. |
| |
| It turned out that pti_clone_pgtable() had alignment assumptions on |
| the start address, notably it hard assumes start is PMD aligned. This |
| is true on x86_64, but very much not true on i386. |
| |
| These assumptions can cause the end condition to malfunction, leading |
| to a 'short' clone. Guess what happens when the user mapping has a |
| short copy of the entry text? |
| |
| Use the correct increment form for addr to avoid alignment |
| assumptions. |
| |
| The Linux kernel CVE team has assigned CVE-2024-44965 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 4.19.320 with commit 18da1b27ce16a14a9b636af9232acb4fb24f4c9e |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 5.4.282 with commit 25a727233a40a9b33370eec9f0cad67d8fd312f8 |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 5.10.224 with commit d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6 |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 5.15.165 with commit 4d143ae782009b43b4f366402e5c37f59d4e4346 |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 6.1.105 with commit 5c580c1050bcbc15c3e78090859d798dcf8c9763 |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 6.6.46 with commit ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 6.10.5 with commit df3eecb5496f87263d171b254ca6e2758ab3c35c |
| Issue introduced in 4.19 with commit 16a3fe634f6a568c6234b8747e5d50487fed3526 and fixed in 6.11 with commit 41e71dbb0e0a0fe214545fe64af031303a08524c |
| |
| 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-2024-44965 |
| 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/x86/mm/pti.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/18da1b27ce16a14a9b636af9232acb4fb24f4c9e |
| https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8 |
| https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6 |
| https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346 |
| https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763 |
| https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed |
| https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35c |
| https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524c |
