| From bippy-1.2.0 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-2024-50203: bpf, arm64: Fix address emission with tag-based KASAN enabled |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf, arm64: Fix address emission with tag-based KASAN enabled |
| |
| When BPF_TRAMP_F_CALL_ORIG is enabled, the address of a bpf_tramp_image |
| struct on the stack is passed during the size calculation pass and |
| an address on the heap is passed during code generation. This may |
| cause a heap buffer overflow if the heap address is tagged because |
| emit_a64_mov_i64() will emit longer code than it did during the size |
| calculation pass. The same problem could occur without tag-based |
| KASAN if one of the 16-bit words of the stack address happened to |
| be all-ones during the size calculation pass. Fix the problem by |
| assuming the worst case (4 instructions) when calculating the size |
| of the bpf_tramp_image address emission. |
| |
| The Linux kernel CVE team has assigned CVE-2024-50203 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit 19d3c179a37730caf600a97fed3794feac2b197b and fixed in 6.11.6 with commit 7db1a2121f3c7903b8e397392beec563c3d00950 |
| Issue introduced in 6.11 with commit 19d3c179a37730caf600a97fed3794feac2b197b and fixed in 6.12 with commit a552e2ef5fd1a6c78267cd4ec5a9b49aa11bbb1c |
| Issue introduced in 6.10.3 with commit 6d218fcc707d6b2c3616b6cd24b948fd4825cfec |
| |
| 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-2024-50203 |
| 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/arm64/net/bpf_jit_comp.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/9e80f366ebfdfafc685fe83a84c34f7ef01cbe88 |
| https://git.kernel.org/stable/c/f521c2a0c0c4585f36d912bf62c852b88682c4f2 |
| https://git.kernel.org/stable/c/7db1a2121f3c7903b8e397392beec563c3d00950 |
| https://git.kernel.org/stable/c/a552e2ef5fd1a6c78267cd4ec5a9b49aa11bbb1c |
