| 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-2024-43874: crypto: ccp - Fix null pointer dereference in __sev_snp_shutdown_locked |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| crypto: ccp - Fix null pointer dereference in __sev_snp_shutdown_locked |
| |
| Fix a null pointer dereference induced by DEBUG_TEST_DRIVER_REMOVE. |
| Return from __sev_snp_shutdown_locked() if the psp_device or the |
| sev_device structs are not initialized. Without the fix, the driver will |
| produce the following splat: |
| |
| ccp 0000:55:00.5: enabling device (0000 -> 0002) |
| ccp 0000:55:00.5: sev enabled |
| ccp 0000:55:00.5: psp enabled |
| BUG: kernel NULL pointer dereference, address: 00000000000000f0 |
| #PF: supervisor read access in kernel mode |
| #PF: error_code(0x0000) - not-present page |
| PGD 0 P4D 0 |
| Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC NOPTI |
| CPU: 262 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc1+ #29 |
| RIP: 0010:__sev_snp_shutdown_locked+0x2e/0x150 |
| Code: 00 55 48 89 e5 41 57 41 56 41 54 53 48 83 ec 10 41 89 f7 49 89 fe 65 48 8b 04 25 28 00 00 00 48 89 45 d8 48 8b 05 6a 5a 7f 06 <4c> 8b a0 f0 00 00 00 41 0f b6 9c 24 a2 00 00 00 48 83 fb 02 0f 83 |
| RSP: 0018:ffffb2ea4014b7b8 EFLAGS: 00010286 |
| RAX: 0000000000000000 RBX: ffff9e4acd2e0a28 RCX: 0000000000000000 |
| RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb2ea4014b808 |
| RBP: ffffb2ea4014b7e8 R08: 0000000000000106 R09: 000000000003d9c0 |
| R10: 0000000000000001 R11: ffffffffa39ff070 R12: ffff9e49d40590c8 |
| R13: 0000000000000000 R14: ffffb2ea4014b808 R15: 0000000000000000 |
| FS: 0000000000000000(0000) GS:ffff9e58b1e00000(0000) knlGS:0000000000000000 |
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| CR2: 00000000000000f0 CR3: 0000000418a3e001 CR4: 0000000000770ef0 |
| PKRU: 55555554 |
| Call Trace: |
| <TASK> |
| ? __die_body+0x6f/0xb0 |
| ? __die+0xcc/0xf0 |
| ? page_fault_oops+0x330/0x3a0 |
| ? save_trace+0x2a5/0x360 |
| ? do_user_addr_fault+0x583/0x630 |
| ? exc_page_fault+0x81/0x120 |
| ? asm_exc_page_fault+0x2b/0x30 |
| ? __sev_snp_shutdown_locked+0x2e/0x150 |
| __sev_firmware_shutdown+0x349/0x5b0 |
| ? pm_runtime_barrier+0x66/0xe0 |
| sev_dev_destroy+0x34/0xb0 |
| psp_dev_destroy+0x27/0x60 |
| sp_destroy+0x39/0x90 |
| sp_pci_remove+0x22/0x60 |
| pci_device_remove+0x4e/0x110 |
| really_probe+0x271/0x4e0 |
| __driver_probe_device+0x8f/0x160 |
| driver_probe_device+0x24/0x120 |
| __driver_attach+0xc7/0x280 |
| ? driver_attach+0x30/0x30 |
| bus_for_each_dev+0x10d/0x130 |
| driver_attach+0x22/0x30 |
| bus_add_driver+0x171/0x2b0 |
| ? unaccepted_memory_init_kdump+0x20/0x20 |
| driver_register+0x67/0x100 |
| __pci_register_driver+0x83/0x90 |
| sp_pci_init+0x22/0x30 |
| sp_mod_init+0x13/0x30 |
| do_one_initcall+0xb8/0x290 |
| ? sched_clock_noinstr+0xd/0x10 |
| ? local_clock_noinstr+0x3e/0x100 |
| ? stack_depot_save_flags+0x21e/0x6a0 |
| ? local_clock+0x1c/0x60 |
| ? stack_depot_save_flags+0x21e/0x6a0 |
| ? sched_clock_noinstr+0xd/0x10 |
| ? local_clock_noinstr+0x3e/0x100 |
| ? __lock_acquire+0xd90/0xe30 |
| ? sched_clock_noinstr+0xd/0x10 |
| ? local_clock_noinstr+0x3e/0x100 |
| ? __create_object+0x66/0x100 |
| ? local_clock+0x1c/0x60 |
| ? __create_object+0x66/0x100 |
| ? parameq+0x1b/0x90 |
| ? parse_one+0x6d/0x1d0 |
| ? parse_args+0xd7/0x1f0 |
| ? do_initcall_level+0x180/0x180 |
| do_initcall_level+0xb0/0x180 |
| do_initcalls+0x60/0xa0 |
| ? kernel_init+0x1f/0x1d0 |
| do_basic_setup+0x41/0x50 |
| kernel_init_freeable+0x1ac/0x230 |
| ? rest_init+0x1f0/0x1f0 |
| kernel_init+0x1f/0x1d0 |
| ? rest_init+0x1f0/0x1f0 |
| ret_from_fork+0x3d/0x50 |
| ? rest_init+0x1f0/0x1f0 |
| ret_from_fork_asm+0x11/0x20 |
| </TASK> |
| Modules linked in: |
| CR2: 00000000000000f0 |
| ---[ end trace 0000000000000000 ]--- |
| RIP: 0010:__sev_snp_shutdown_locked+0x2e/0x150 |
| Code: 00 55 48 89 e5 41 57 41 56 41 54 53 48 83 ec 10 41 89 f7 49 89 fe 65 48 8b 04 25 28 00 00 00 48 89 45 d8 48 8b 05 6a 5a 7f 06 <4c> 8b a0 f0 00 00 00 41 0f b6 9c 24 a2 00 00 00 48 83 fb 02 0f 83 |
| RSP: 0018:ffffb2ea4014b7b8 EFLAGS: 00010286 |
| RAX: 0000000000000000 RBX: ffff9e4acd2e0a28 RCX: 0000000000000000 |
| RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb2ea4014b808 |
| RBP: ffffb2ea4014b7e8 R08: 0000000000000106 R09: 000000000003d9c0 |
| R10: 0000000000000001 R11: ffffffffa39ff070 R12: ffff9e49d40590c8 |
| R13: 0000000000000000 R14: ffffb2ea4014b808 R15: 0000000000000000 |
| FS: 0000000000000000(0000) GS:ffff9e58b1e00000(0000) knlGS:0000000000000000 |
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| CR2: 00000000000000f0 CR3: 0000000418a3e001 CR4: 0000000000770ef0 |
| PKRU: 55555554 |
| Kernel panic - not syncing: Fatal exception |
| Kernel Offset: 0x1fc00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) |
| |
| The Linux kernel CVE team has assigned CVE-2024-43874 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.9 with commit 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 and fixed in 6.10.3 with commit bbf2c94503f6a421ed9b79e300d8085810da765d |
| Issue introduced in 6.9 with commit 1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 and fixed in 6.11 with commit 468e3295774d0edce15f4ae475913b5076dd4f40 |
| |
| 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-2024-43874 |
| 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: |
| drivers/crypto/ccp/sev-dev.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/bbf2c94503f6a421ed9b79e300d8085810da765d |
| https://git.kernel.org/stable/c/468e3295774d0edce15f4ae475913b5076dd4f40 |
