| 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-2024-43843: riscv, bpf: Fix out-of-bounds issue when preparing trampoline image |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| riscv, bpf: Fix out-of-bounds issue when preparing trampoline image |
| |
| We get the size of the trampoline image during the dry run phase and |
| allocate memory based on that size. The allocated image will then be |
| populated with instructions during the real patch phase. But after |
| commit 26ef208c209a ("bpf: Use arch_bpf_trampoline_size"), the `im` |
| argument is inconsistent in the dry run and real patch phase. This may |
| cause emit_imm in RV64 to generate a different number of instructions |
| when generating the 'im' address, potentially causing out-of-bounds |
| issues. Let's emit the maximum number of instructions for the "im" |
| address during dry run to fix this problem. |
| |
| The Linux kernel CVE team has assigned CVE-2024-43843 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 26ef208c209a0e6eed8942a5d191b39dccfa6e38 and fixed in 6.10.3 with commit 3e6a1b1b179abb643ec3560c02bc3082bc92285f |
| Issue introduced in 6.8 with commit 26ef208c209a0e6eed8942a5d191b39dccfa6e38 and fixed in 6.11 with commit 9f1e16fb1fc9826001c69e0551d51fbbcd2d74e9 |
| |
| 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-2024-43843 |
| 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/riscv/net/bpf_jit_comp64.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/3e6a1b1b179abb643ec3560c02bc3082bc92285f |
| https://git.kernel.org/stable/c/9f1e16fb1fc9826001c69e0551d51fbbcd2d74e9 |
