| 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-2024-56772: kunit: string-stream: Fix a UAF bug in kunit_init_suite() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| kunit: string-stream: Fix a UAF bug in kunit_init_suite() |
| |
| In kunit_debugfs_create_suite(), if alloc_string_stream() fails in the |
| kunit_suite_for_each_test_case() loop, the "suite->log = stream" |
| has assigned before, and the error path only free the suite->log's stream |
| memory but not set it to NULL, so the later string_stream_clear() of |
| suite->log in kunit_init_suite() will cause below UAF bug. |
| |
| Set stream pointer to NULL after free to fix it. |
| |
| Unable to handle kernel paging request at virtual address 006440150000030d |
| Mem abort info: |
| ESR = 0x0000000096000004 |
| EC = 0x25: DABT (current EL), IL = 32 bits |
| SET = 0, FnV = 0 |
| EA = 0, S1PTW = 0 |
| FSC = 0x04: level 0 translation fault |
| Data abort info: |
| ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 |
| CM = 0, WnR = 0, TnD = 0, TagAccess = 0 |
| GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 |
| [006440150000030d] address between user and kernel address ranges |
| Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP |
| Dumping ftrace buffer: |
| (ftrace buffer empty) |
| Modules linked in: iio_test_gts industrialio_gts_helper cfg80211 rfkill ipv6 [last unloaded: iio_test_gts] |
| CPU: 5 UID: 0 PID: 6253 Comm: modprobe Tainted: G B W N 6.12.0-rc4+ #458 |
| Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST |
| Hardware name: linux,dummy-virt (DT) |
| pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| pc : string_stream_clear+0x54/0x1ac |
| lr : string_stream_clear+0x1a8/0x1ac |
| sp : ffffffc080b47410 |
| x29: ffffffc080b47410 x28: 006440550000030d x27: ffffff80c96b5e98 |
| x26: ffffff80c96b5e80 x25: ffffffe461b3f6c0 x24: 0000000000000003 |
| x23: ffffff80c96b5e88 x22: 1ffffff019cdf4fc x21: dfffffc000000000 |
| x20: ffffff80ce6fa7e0 x19: 032202a80000186d x18: 0000000000001840 |
| x17: 0000000000000000 x16: 0000000000000000 x15: ffffffe45c355cb4 |
| x14: ffffffe45c35589c x13: ffffffe45c03da78 x12: ffffffb810168e75 |
| x11: 1ffffff810168e74 x10: ffffffb810168e74 x9 : dfffffc000000000 |
| x8 : 0000000000000004 x7 : 0000000000000003 x6 : 0000000000000001 |
| x5 : ffffffc080b473a0 x4 : 0000000000000000 x3 : 0000000000000000 |
| x2 : 0000000000000001 x1 : ffffffe462fbf620 x0 : dfffffc000000000 |
| Call trace: |
| string_stream_clear+0x54/0x1ac |
| __kunit_test_suites_init+0x108/0x1d8 |
| kunit_exec_run_tests+0xb8/0x100 |
| kunit_module_notify+0x400/0x55c |
| notifier_call_chain+0xfc/0x3b4 |
| blocking_notifier_call_chain+0x68/0x9c |
| do_init_module+0x24c/0x5c8 |
| load_module+0x4acc/0x4e90 |
| init_module_from_file+0xd4/0x128 |
| idempotent_init_module+0x2d4/0x57c |
| __arm64_sys_finit_module+0xac/0x100 |
| invoke_syscall+0x6c/0x258 |
| el0_svc_common.constprop.0+0x160/0x22c |
| do_el0_svc+0x44/0x5c |
| el0_svc+0x48/0xb8 |
| el0t_64_sync_handler+0x13c/0x158 |
| el0t_64_sync+0x190/0x194 |
| Code: f9400753 d2dff800 f2fbffe0 d343fe7c (38e06b80) |
| ---[ end trace 0000000000000000 ]--- |
| Kernel panic - not syncing: Oops: Fatal exception |
| |
| The Linux kernel CVE team has assigned CVE-2024-56772 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit a3fdf784780ccb0008d630e8722d1389c49c7499 and fixed in 6.12.4 with commit 3213b92754b94dec6836e8b4d6ec7d224a805b61 |
| Issue introduced in 6.7 with commit a3fdf784780ccb0008d630e8722d1389c49c7499 and fixed in 6.13 with commit 39e21403c978862846fa68b7f6d06f9cca235194 |
| |
| 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-2024-56772 |
| 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: |
| lib/kunit/debugfs.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/3213b92754b94dec6836e8b4d6ec7d224a805b61 |
| https://git.kernel.org/stable/c/39e21403c978862846fa68b7f6d06f9cca235194 |
