| 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-2024-43840: bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG |
| |
| When BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls |
| __bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them |
| the struct bpf_tramp_image *im pointer as an argument in R0. |
| |
| The trampoline generation code uses emit_addr_mov_i64() to emit |
| instructions for moving the bpf_tramp_image address into R0, but |
| emit_addr_mov_i64() assumes the address to be in the vmalloc() space |
| and uses only 48 bits. Because bpf_tramp_image is allocated using |
| kzalloc(), its address can use more than 48-bits, in this case the |
| trampoline will pass an invalid address to __bpf_tramp_enter/exit() |
| causing a kernel crash. |
| |
| Fix this by using emit_a64_mov_i64() in place of emit_addr_mov_i64() |
| as it can work with addresses that are greater than 48-bits. |
| |
| The Linux kernel CVE team has assigned CVE-2024-43840 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit efc9909fdce00a827a37609628223cd45bf95d0b and fixed in 6.1.140 with commit 077149478497b2f00ff4fd9da2c892defa6418d8 |
| Issue introduced in 6.0 with commit efc9909fdce00a827a37609628223cd45bf95d0b and fixed in 6.6.92 with commit d9664e6ff040798a46cdc5d401064f55b8676c83 |
| Issue introduced in 6.0 with commit efc9909fdce00a827a37609628223cd45bf95d0b and fixed in 6.10.3 with commit 6d218fcc707d6b2c3616b6cd24b948fd4825cfec |
| Issue introduced in 6.0 with commit efc9909fdce00a827a37609628223cd45bf95d0b and fixed in 6.11 with commit 19d3c179a37730caf600a97fed3794feac2b197b |
| |
| 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-2024-43840 |
| 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/077149478497b2f00ff4fd9da2c892defa6418d8 |
| https://git.kernel.org/stable/c/d9664e6ff040798a46cdc5d401064f55b8676c83 |
| https://git.kernel.org/stable/c/6d218fcc707d6b2c3616b6cd24b948fd4825cfec |
| https://git.kernel.org/stable/c/19d3c179a37730caf600a97fed3794feac2b197b |
