| 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-2024-50133: LoongArch: Don't crash in stack_top() for tasks without vDSO |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| LoongArch: Don't crash in stack_top() for tasks without vDSO |
| |
| Not all tasks have a vDSO mapped, for example kthreads never do. If such |
| a task ever ends up calling stack_top(), it will derefence the NULL vdso |
| pointer and crash. |
| |
| This can for example happen when using kunit: |
| |
| [<9000000000203874>] stack_top+0x58/0xa8 |
| [<90000000002956cc>] arch_pick_mmap_layout+0x164/0x220 |
| [<90000000003c284c>] kunit_vm_mmap_init+0x108/0x12c |
| [<90000000003c1fbc>] __kunit_add_resource+0x38/0x8c |
| [<90000000003c2704>] kunit_vm_mmap+0x88/0xc8 |
| [<9000000000410b14>] usercopy_test_init+0xbc/0x25c |
| [<90000000003c1db4>] kunit_try_run_case+0x5c/0x184 |
| [<90000000003c3d54>] kunit_generic_run_threadfn_adapter+0x24/0x48 |
| [<900000000022e4bc>] kthread+0xc8/0xd4 |
| [<9000000000200ce8>] ret_from_kernel_thread+0xc/0xa4 |
| |
| The Linux kernel CVE team has assigned CVE-2024-50133 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.19 with commit 803b0fc5c3f2baa6e54978cd576407896f789b08 and fixed in 6.1.115 with commit a67d4a02bf43e15544179895ede7d5f97b84b550 |
| Issue introduced in 5.19 with commit 803b0fc5c3f2baa6e54978cd576407896f789b08 and fixed in 6.6.59 with commit a94c197d4d749954dfaa37e907fcc8c04e4aad7e |
| Issue introduced in 5.19 with commit 803b0fc5c3f2baa6e54978cd576407896f789b08 and fixed in 6.11.6 with commit 041cc3860b06770357876d1114d615333b0fbf31 |
| Issue introduced in 5.19 with commit 803b0fc5c3f2baa6e54978cd576407896f789b08 and fixed in 6.12 with commit 134475a9ab8487527238d270639a8cb74c10aab2 |
| |
| 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-2024-50133 |
| 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/loongarch/kernel/process.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/a67d4a02bf43e15544179895ede7d5f97b84b550 |
| https://git.kernel.org/stable/c/a94c197d4d749954dfaa37e907fcc8c04e4aad7e |
| https://git.kernel.org/stable/c/041cc3860b06770357876d1114d615333b0fbf31 |
| https://git.kernel.org/stable/c/134475a9ab8487527238d270639a8cb74c10aab2 |
