| 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-2024-43901: drm/amd/display: Fix NULL pointer dereference for DTN log in DCN401 |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Fix NULL pointer dereference for DTN log in DCN401 |
| |
| When users run the command: |
| |
| cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log |
| |
| The following NULL pointer dereference happens: |
| |
| [ +0.000003] BUG: kernel NULL pointer dereference, address: NULL |
| [ +0.000005] #PF: supervisor instruction fetch in kernel mode |
| [ +0.000002] #PF: error_code(0x0010) - not-present page |
| [ +0.000002] PGD 0 P4D 0 |
| [ +0.000004] Oops: 0010 [#1] PREEMPT SMP NOPTI |
| [ +0.000003] RIP: 0010:0x0 |
| [ +0.000008] Code: Unable to access opcode bytes at 0xffffffffffffffd6. |
| [...] |
| [ +0.000002] PKRU: 55555554 |
| [ +0.000002] Call Trace: |
| [ +0.000002] <TASK> |
| [ +0.000003] ? show_regs+0x65/0x70 |
| [ +0.000006] ? __die+0x24/0x70 |
| [ +0.000004] ? page_fault_oops+0x160/0x470 |
| [ +0.000006] ? do_user_addr_fault+0x2b5/0x690 |
| [ +0.000003] ? prb_read_valid+0x1c/0x30 |
| [ +0.000005] ? exc_page_fault+0x8c/0x1a0 |
| [ +0.000005] ? asm_exc_page_fault+0x27/0x30 |
| [ +0.000012] dcn10_log_color_state+0xf9/0x510 [amdgpu] |
| [ +0.000306] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000003] ? vsnprintf+0x2fb/0x600 |
| [ +0.000009] dcn10_log_hw_state+0xfd0/0xfe0 [amdgpu] |
| [ +0.000218] ? __mod_memcg_lruvec_state+0xe8/0x170 |
| [ +0.000008] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000002] ? debug_smp_processor_id+0x17/0x20 |
| [ +0.000003] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000002] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000002] ? set_ptes.isra.0+0x2b/0x90 |
| [ +0.000004] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000002] ? _raw_spin_unlock+0x19/0x40 |
| [ +0.000004] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000002] ? do_anonymous_page+0x337/0x700 |
| [ +0.000004] dtn_log_read+0x82/0x120 [amdgpu] |
| [ +0.000207] full_proxy_read+0x66/0x90 |
| [ +0.000007] vfs_read+0xb0/0x340 |
| [ +0.000005] ? __count_memcg_events+0x79/0xe0 |
| [ +0.000002] ? srso_alias_return_thunk+0x5/0xfbef5 |
| [ +0.000003] ? count_memcg_events.constprop.0+0x1e/0x40 |
| [ +0.000003] ? handle_mm_fault+0xb2/0x370 |
| [ +0.000003] ksys_read+0x6b/0xf0 |
| [ +0.000004] __x64_sys_read+0x19/0x20 |
| [ +0.000003] do_syscall_64+0x60/0x130 |
| [ +0.000004] entry_SYSCALL_64_after_hwframe+0x6e/0x76 |
| [ +0.000003] RIP: 0033:0x7fdf32f147e2 |
| [...] |
| |
| This error happens when the color log tries to read the gamut remap |
| information from DCN401 which is not initialized in the dcn401_dpp_funcs |
| which leads to a null pointer dereference. This commit addresses this |
| issue by adding a proper guard to access the gamut_remap callback in |
| case the specific ASIC did not implement this function. |
| |
| The Linux kernel CVE team has assigned CVE-2024-43901 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.10.5 with commit 1e68b7ce6bc6073579fe8713ec6b85aa9cd2e351 |
| Fixed in 6.11 with commit 5af757124792817f8eb1bd0c80ad60fab519586b |
| |
| 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-2024-43901 |
| 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/gpu/drm/amd/display/dc/hwss/dcn10/dcn10_hwseq.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/1e68b7ce6bc6073579fe8713ec6b85aa9cd2e351 |
| https://git.kernel.org/stable/c/5af757124792817f8eb1bd0c80ad60fab519586b |
