| 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-2022-48918: iwlwifi: mvm: check debugfs_dir ptr before use |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iwlwifi: mvm: check debugfs_dir ptr before use |
| |
| When "debugfs=off" is used on the kernel command line, iwiwifi's |
| mvm module uses an invalid/unchecked debugfs_dir pointer and causes |
| a BUG: |
| |
| BUG: kernel NULL pointer dereference, address: 000000000000004f |
| #PF: supervisor read access in kernel mode |
| #PF: error_code(0x0000) - not-present page |
| PGD 0 P4D 0 |
| Oops: 0000 [#1] PREEMPT SMP |
| CPU: 1 PID: 503 Comm: modprobe Tainted: G W 5.17.0-rc5 #7 |
| Hardware name: Dell Inc. Inspiron 15 5510/076F7Y, BIOS 2.4.1 11/05/2021 |
| RIP: 0010:iwl_mvm_dbgfs_register+0x692/0x700 [iwlmvm] |
| Code: 69 a0 be 80 01 00 00 48 c7 c7 50 73 6a a0 e8 95 cf ee e0 48 8b 83 b0 1e 00 00 48 c7 c2 54 73 6a a0 be 64 00 00 00 48 8d 7d 8c <48> 8b 48 50 e8 15 22 07 e1 48 8b 43 28 48 8d 55 8c 48 c7 c7 5f 73 |
| RSP: 0018:ffffc90000a0ba68 EFLAGS: 00010246 |
| RAX: ffffffffffffffff RBX: ffff88817d6e3328 RCX: ffff88817d6e3328 |
| RDX: ffffffffa06a7354 RSI: 0000000000000064 RDI: ffffc90000a0ba6c |
| RBP: ffffc90000a0bae0 R08: ffffffff824e4880 R09: ffffffffa069d620 |
| R10: ffffc90000a0ba00 R11: ffffffffffffffff R12: 0000000000000000 |
| R13: ffffc90000a0bb28 R14: ffff88817d6e3328 R15: ffff88817d6e3320 |
| FS: 00007f64dd92d740(0000) GS:ffff88847f640000(0000) knlGS:0000000000000000 |
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| CR2: 000000000000004f CR3: 000000016fc79001 CR4: 0000000000770ee0 |
| PKRU: 55555554 |
| Call Trace: |
| <TASK> |
| ? iwl_mvm_mac_setup_register+0xbdc/0xda0 [iwlmvm] |
| iwl_mvm_start_post_nvm+0x71/0x100 [iwlmvm] |
| iwl_op_mode_mvm_start+0xab8/0xb30 [iwlmvm] |
| _iwl_op_mode_start+0x6f/0xd0 [iwlwifi] |
| iwl_opmode_register+0x6a/0xe0 [iwlwifi] |
| ? 0xffffffffa0231000 |
| iwl_mvm_init+0x35/0x1000 [iwlmvm] |
| ? 0xffffffffa0231000 |
| do_one_initcall+0x5a/0x1b0 |
| ? kmem_cache_alloc+0x1e5/0x2f0 |
| ? do_init_module+0x1e/0x220 |
| do_init_module+0x48/0x220 |
| load_module+0x2602/0x2bc0 |
| ? __kernel_read+0x145/0x2e0 |
| ? kernel_read_file+0x229/0x290 |
| __do_sys_finit_module+0xc5/0x130 |
| ? __do_sys_finit_module+0xc5/0x130 |
| __x64_sys_finit_module+0x13/0x20 |
| do_syscall_64+0x38/0x90 |
| entry_SYSCALL_64_after_hwframe+0x44/0xae |
| RIP: 0033:0x7f64dda564dd |
| Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1b 29 0f 00 f7 d8 64 89 01 48 |
| RSP: 002b:00007ffdba393f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 |
| RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f64dda564dd |
| RDX: 0000000000000000 RSI: 00005575399e2ab2 RDI: 0000000000000001 |
| RBP: 000055753a91c5e0 R08: 0000000000000000 R09: 0000000000000002 |
| R10: 0000000000000001 R11: 0000000000000246 R12: 00005575399e2ab2 |
| R13: 000055753a91ceb0 R14: 0000000000000000 R15: 000055753a923018 |
| </TASK> |
| Modules linked in: btintel(+) btmtk bluetooth vfat snd_hda_codec_hdmi fat snd_hda_codec_realtek snd_hda_codec_generic iwlmvm(+) snd_sof_pci_intel_tgl mac80211 snd_sof_intel_hda_common soundwire_intel soundwire_generic_allocation soundwire_cadence soundwire_bus snd_sof_intel_hda snd_sof_pci snd_sof snd_sof_xtensa_dsp snd_soc_hdac_hda snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core btrfs snd_compress snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec raid6_pq iwlwifi snd_hda_core snd_pcm snd_timer snd soundcore cfg80211 intel_ish_ipc(+) thunderbolt rfkill intel_ishtp ucsi_acpi wmi i2c_hid_acpi i2c_hid evdev |
| CR2: 000000000000004f |
| ---[ end trace 0000000000000000 ]--- |
| |
| Check the debugfs_dir pointer for an error before using it. |
| |
| [change to make both conditional] |
| |
| The Linux kernel CVE team has assigned CVE-2022-48918 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.12 with commit 8c082a99edb997d7999eb7cdb648e47a2bf4a638 and fixed in 5.15.27 with commit 7de1ed755e1ace30d97a724bad32452ed86b653b |
| Issue introduced in 5.12 with commit 8c082a99edb997d7999eb7cdb648e47a2bf4a638 and fixed in 5.16.13 with commit fe51975ff13831e794e1bcd0039b305dcad3d7ba |
| Issue introduced in 5.12 with commit 8c082a99edb997d7999eb7cdb648e47a2bf4a638 and fixed in 5.17 with commit 5a6248c0a22352f09ea041665d3bd3e18f6f872c |
| |
| 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-2022-48918 |
| 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/net/wireless/intel/iwlwifi/mvm/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/7de1ed755e1ace30d97a724bad32452ed86b653b |
| https://git.kernel.org/stable/c/fe51975ff13831e794e1bcd0039b305dcad3d7ba |
| https://git.kernel.org/stable/c/5a6248c0a22352f09ea041665d3bd3e18f6f872c |
