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A vulnerability in the Linux kernel's drm/nouveau/gsp component was fixed by adding SEC2 to the GA100 chip table. The issue caused a NULL pointer dereference during GSP-RM boot due to the absence of the .sec2 entry, which is required for accessing the SEC2 falcon. This flaw could cause a crash during initialization on affected versions.

This vulnerability involves the Linux kernel nouveau driver where WARN_ON calls in ACPI probes were causing frequent warnings. The issue was addressed by removing these WARN_ON calls, which were deemed mostly harmless and without a planned fix. The fix has been applied in specific commits.

In the Linux kernel, the following vulnerability has been resolved: nvkm: correctly calculate the available space of the GSP cmdq buffer r535_gsp_cmdq_push() waits for the available page in the GSP cmdq buffer when handling a large RPC request. When it sees at least one available page in the cmdq, it quits the waiting with the amount of free buffer pages in the queue. Unfortunately, it always takes the [write pointer, buf_size) as available buffer pages before rolling back and wrongly calculates the size of the data should be copied. Thus, it can overwrite the RPC request that GSP is currently reading, which causes GSP hang due to corrupted RPC request: [ 549.209389] ------------[ cut here ]------------ [ 549.214010] WARNING: CPU: 8 PID: 6314 at drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:116 r535_gsp_msgq_wait+0xd0/0x190 [nvkm] [ 549.225678] Modules linked in: nvkm(E+) gsp_log(E) snd_seq_dummy(E) snd_hrtimer(E) snd_seq(E) snd_timer(E) snd_seq_device(E) snd(E) soundcore(E) rfkill(E) qrtr(E) vfat(E) fat(E) ipmi_ssif(E) amd_atl(E) intel_rapl_msr(E) intel_rapl_common(E) mlx5_ib(E) amd64_edac(E) edac_mce_amd(E) kvm_amd(E) ib_uverbs(E) kvm(E) ib_core(E) acpi_ipmi(E) ipmi_si(E) mxm_wmi(E) ipmi_devintf(E) rapl(E) i2c_piix4(E) wmi_bmof(E) joydev(E) ptdma(E) acpi_cpufreq(E) k10temp(E) pcspkr(E) ipmi_msghandler(E) xfs(E) libcrc32c(E) ast(E) i2c_algo_bit(E) crct10dif_pclmul(E) drm_shmem_helper(E) nvme_tcp(E) crc32_pclmul(E) ahci(E) drm_kms_helper(E) libahci(E) nvme_fabrics(E) crc32c_intel(E) nvme(E) cdc_ether(E) mlx5_core(E) nvme_core(E) usbnet(E) drm(E) libata(E) ccp(E) ghash_clmulni_intel(E) mii(E) t10_pi(E) mlxfw(E) sp5100_tco(E) psample(E) pci_hyperv_intf(E) wmi(E) dm_multipath(E) sunrpc(E) dm_mirror(E) dm_region_hash(E) dm_log(E) dm_mod(E) be2iscsi(E) bnx2i(E) cnic(E) uio(E) cxgb4i(E) cxgb4(E) tls(E) libcxgbi(E) libcxgb(E) qla4xxx(E) [ 549.225752] iscsi_boot_sysfs(E) iscsi_tcp(E) libiscsi_tcp(E) libiscsi(E) scsi_transport_iscsi(E) fuse(E) [last unloaded: gsp_log(E)] [ 549.326293] CPU: 8 PID: 6314 Comm: insmod Tainted: G E 6.9.0-rc6+ #1 [ 549.334039] Hardware name: ASRockRack 1U1G-MILAN/N/ROMED8-NL, BIOS L3.12E 09/06/2022 [ 549.341781] RIP: 0010:r535_gsp_msgq_wait+0xd0/0x190 [nvkm] [ 549.347343] Code: 08 00 00 89 da c1 e2 0c 48 8d ac 11 00 10 00 00 48 8b 0c 24 48 85 c9 74 1f c1 e0 0c 4c 8d 6d 30 83 e8 30 89 01 e9 68 ff ff ff <0f> 0b 49 c7 c5 92 ff ff ff e9 5a ff ff ff ba ff ff ff ff be c0 0c [ 549.366090] RSP: 0018:ffffacbccaaeb7d0 EFLAGS: 00010246 [ 549.371315] RAX: 0000000000000000 RBX: 0000000000000012 RCX: 0000000000923e28 [ 549.378451] RDX: 0000000000000000 RSI: 0000000055555554 RDI: ffffacbccaaeb730 [ 549.385590] RBP: 0000000000000001 R08: ffff8bd14d235f70 R09: ffff8bd14d235f70 [ 549.392721] R10: 0000000000000002 R11: ffff8bd14d233864 R12: 0000000000000020 [ 549.399854] R13: ffffacbccaaeb818 R14: 0000000000000020 R15: ffff8bb298c67000 [ 549.406988] FS: 00007f5179244740(0000) GS:ffff8bd14d200000(0000) knlGS:0000000000000000 [ 549.415076] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 549.420829] CR2: 00007fa844000010 CR3: 00000001567dc005 CR4: 0000000000770ef0 [ 549.427963] PKRU: 55555554 [ 549.430672] Call Trace: [ 549.433126] <TASK> [ 549.435233] ? __warn+0x7f/0x130 [ 549.438473] ? r535_gsp_msgq_wait+0xd0/0x190 [nvkm] [ 549.443426] ? report_bug+0x18a/0x1a0 [ 549.447098] ? handle_bug+0x3c/0x70 [ 549.450589] ? exc_invalid_op+0x14/0x70 [ 549.454430] ? asm_exc_invalid_op+0x16/0x20 [ 549.458619] ? r535_gsp_msgq_wait+0xd0/0x190 [nvkm] [ 549.463565] r535_gsp_msg_recv+0x46/0x230 [nvkm] [ 549.468257] r535_gsp_rpc_push+0x106/0x160 [nvkm] [ 549.473033] r535_gsp_rpc_rm_ctrl_push+0x40/0x130 [nvkm] [ 549.478422] nvidia_grid_init_vgpu_types+0xbc/0xe0 [nvkm] [ 549.483899] nvidia_grid_init+0xb1/0xd0 [nvkm] [ 549.488420] ? srso_alias_return_thunk+0x5/0xfbef5 [ 549.493213] nvkm_device_pci_probe+0x305/0x420 [nvkm] [ 549.498338] local_pci_probe+0x46/ ---truncated---

In the Linux kernel, the following vulnerability has been resolved: nvkm/gsp: correctly advance the read pointer of GSP message queue A GSP event message consists three parts: message header, RPC header, message body. GSP calculates the number of pages to write from the total size of a GSP message. This behavior can be observed from the movement of the write pointer. However, nvkm takes only the size of RPC header and message body as the message size when advancing the read pointer. When handling a two-page GSP message in the non rollback case, It wrongly takes the message body of the previous message as the message header of the next message. As the "message length" tends to be zero, in the calculation of size needs to be copied (0 - size of (message header)), the size needs to be copied will be "0xffffffxx". It also triggers a kernel panic due to a NULL pointer error. [ 547.614102] msg: 00000f90: ff ff ff ff ff ff ff ff 40 d7 18 fb 8b 00 00 00 ........@....... [ 547.622533] msg: 00000fa0: 00 00 00 00 ff ff ff ff ff ff ff ff 00 00 00 00 ................ [ 547.630965] msg: 00000fb0: ff ff ff ff ff ff ff ff 00 00 00 00 ff ff ff ff ................ [ 547.639397] msg: 00000fc0: ff ff ff ff 00 00 00 00 ff ff ff ff ff ff ff ff ................ [ 547.647832] nvkm 0000:c1:00.0: gsp: peek msg rpc fn:0 len:0x0/0xffffffffffffffe0 [ 547.655225] nvkm 0000:c1:00.0: gsp: get msg rpc fn:0 len:0x0/0xffffffffffffffe0 [ 547.662532] BUG: kernel NULL pointer dereference, address: 0000000000000020 [ 547.669485] #PF: supervisor read access in kernel mode [ 547.674624] #PF: error_code(0x0000) - not-present page [ 547.679755] PGD 0 P4D 0 [ 547.682294] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 547.686643] CPU: 22 PID: 322 Comm: kworker/22:1 Tainted: G E 6.9.0-rc6+ #1 [ 547.694893] Hardware name: ASRockRack 1U1G-MILAN/N/ROMED8-NL, BIOS L3.12E 09/06/2022 [ 547.702626] Workqueue: events r535_gsp_msgq_work [nvkm] [ 547.707921] RIP: 0010:r535_gsp_msg_recv+0x87/0x230 [nvkm] [ 547.713375] Code: 00 8b 70 08 48 89 e1 31 d2 4c 89 f7 e8 12 f5 ff ff 48 89 c5 48 85 c0 0f 84 cf 00 00 00 48 81 fd 00 f0 ff ff 0f 87 c4 00 00 00 <8b> 55 10 41 8b 46 30 85 d2 0f 85 f6 00 00 00 83 f8 04 76 10 ba 05 [ 547.732119] RSP: 0018:ffffabe440f87e10 EFLAGS: 00010203 [ 547.737335] RAX: 0000000000000010 RBX: 0000000000000008 RCX: 000000000000003f [ 547.744461] RDX: 0000000000000000 RSI: ffffabe4480a8030 RDI: 0000000000000010 [ 547.751585] RBP: 0000000000000010 R08: 0000000000000000 R09: ffffabe440f87bb0 [ 547.758707] R10: ffffabe440f87dc8 R11: 0000000000000010 R12: 0000000000000000 [ 547.765834] R13: 0000000000000000 R14: ffff9351df1e5000 R15: 0000000000000000 [ 547.772958] FS: 0000000000000000(0000) GS:ffff93708eb00000(0000) knlGS:0000000000000000 [ 547.781035] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 547.786771] CR2: 0000000000000020 CR3: 00000003cc220002 CR4: 0000000000770ef0 [ 547.793896] PKRU: 55555554 [ 547.796600] Call Trace: [ 547.799046] <TASK> [ 547.801152] ? __die+0x20/0x70 [ 547.804211] ? page_fault_oops+0x75/0x170 [ 547.808221] ? print_hex_dump+0x100/0x160 [ 547.812226] ? exc_page_fault+0x64/0x150 [ 547.816152] ? asm_exc_page_fault+0x22/0x30 [ 547.820341] ? r535_gsp_msg_recv+0x87/0x230 [nvkm] [ 547.825184] r535_gsp_msgq_work+0x42/0x50 [nvkm] [ 547.829845] process_one_work+0x196/0x3d0 [ 547.833861] worker_thread+0x2fc/0x410 [ 547.837613] ? __pfx_worker_thread+0x10/0x10 [ 547.841885] kthread+0xdf/0x110 [ 547.845031] ? __pfx_kthread+0x10/0x10 [ 547.848775] ret_from_fork+0x30/0x50 [ 547.852354] ? __pfx_kthread+0x10/0x10 [ 547.856097] ret_from_fork_asm+0x1a/0x30 [ 547.860019] </TASK> [ 547.862208] Modules linked in: nvkm(E) gsp_log(E) snd_seq_dummy(E) snd_hrtimer(E) snd_seq(E) snd_timer(E) snd_seq_device(E) snd(E) soundcore(E) rfkill(E) qrtr(E) vfat(E) fat(E) ipmi_ssif(E) amd_atl(E) intel_rapl_msr(E) intel_rapl_common(E) amd64_edac(E) mlx5_ib(E) edac_mce_amd(E) kvm_amd ---truncated---