| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-46774: powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas() |
| |
| Smatch warns: |
| |
| arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential |
| spectre issue 'args.args' [r] (local cap) |
| |
| The 'nargs' and 'nret' locals come directly from a user-supplied |
| buffer and are used as indexes into a small stack-based array and as |
| inputs to copy_to_user() after they are subject to bounds checks. |
| |
| Use array_index_nospec() after the bounds checks to clamp these values |
| for speculative execution. |
| |
| The Linux kernel CVE team has assigned CVE-2024-46774 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.237 with commit d2834ff1d9641a8695a09ea79cd901c7b6d4d05f |
| Fixed in 5.15.181 with commit a262c2dc833f2fe1bd5c53a4d899e7077d3b1da9 |
| Fixed in 6.1.135 with commit b137af795399d8b657bad1646c18561530f35ed1 |
| Fixed in 6.6.88 with commit 1f1feff02e9da0dd0cdb195c428c42b5f9b6c771 |
| Fixed in 6.10.10 with commit 68d8156480940b79227d58865ec5d2947b9384a8 |
| Fixed in 6.11 with commit 0974d03eb479384466d828d65637814bee6b26d7 |
| |
| 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-2024-46774 |
| 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/kernel/rtas.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/d2834ff1d9641a8695a09ea79cd901c7b6d4d05f |
| https://git.kernel.org/stable/c/a262c2dc833f2fe1bd5c53a4d899e7077d3b1da9 |
| https://git.kernel.org/stable/c/b137af795399d8b657bad1646c18561530f35ed1 |
| https://git.kernel.org/stable/c/1f1feff02e9da0dd0cdb195c428c42b5f9b6c771 |
| https://git.kernel.org/stable/c/68d8156480940b79227d58865ec5d2947b9384a8 |
| https://git.kernel.org/stable/c/0974d03eb479384466d828d65637814bee6b26d7 |
