{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2023-52506",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Set all reserved memblocks on Node#0 at initialization\n\nAfter commit 61167ad5fecdea (\"mm: pass nid to reserve_bootmem_region()\")\nwe get a panic if DEFERRED_STRUCT_PAGE_INIT is enabled:\n\n[    0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000000000002b82, era == 90000000040e3f28, ra == 90000000040e3f18\n[    0.000000] Oops[#1]:\n[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.5.0+ #733\n[    0.000000] pc 90000000040e3f28 ra 90000000040e3f18 tp 90000000046f4000 sp 90000000046f7c90\n[    0.000000] a0 0000000000000001 a1 0000000000200000 a2 0000000000000040 a3 90000000046f7ca0\n[    0.000000] a4 90000000046f7ca4 a5 0000000000000000 a6 90000000046f7c38 a7 0000000000000000\n[    0.000000] t0 0000000000000002 t1 9000000004b00ac8 t2 90000000040e3f18 t3 90000000040f0800\n[    0.000000] t4 00000000000f0000 t5 80000000ffffe07e t6 0000000000000003 t7 900000047fff5e20\n[    0.000000] t8 aaaaaaaaaaaaaaab u0 0000000000000018 s9 0000000000000000 s0 fffffefffe000000\n[    0.000000] s1 0000000000000000 s2 0000000000000080 s3 0000000000000040 s4 0000000000000000\n[    0.000000] s5 0000000000000000 s6 fffffefffe000000 s7 900000000470b740 s8 9000000004ad4000\n[    0.000000]    ra: 90000000040e3f18 reserve_bootmem_region+0xec/0x21c\n[    0.000000]   ERA: 90000000040e3f28 reserve_bootmem_region+0xfc/0x21c\n[    0.000000]  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)\n[    0.000000]  PRMD: 00000000 (PPLV0 -PIE -PWE)\n[    0.000000]  EUEN: 00000000 (-FPE -SXE -ASXE -BTE)\n[    0.000000]  ECFG: 00070800 (LIE=11 VS=7)\n[    0.000000] ESTAT: 00010800 [PIL] (IS=11 ECode=1 EsubCode=0)\n[    0.000000]  BADV: 0000000000002b82\n[    0.000000]  PRID: 0014d000 (Loongson-64bit, Loongson-3A6000)\n[    0.000000] Modules linked in:\n[    0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____))\n[    0.000000] Stack : 0000000000000000 9000000002eb5430 0000003a00000020 90000000045ccd00\n[    0.000000]         900000000470e000 90000000002c1918 0000000000000000 9000000004110780\n[    0.000000]         00000000fe6c0000 0000000480000000 9000000004b4e368 9000000004110748\n[    0.000000]         0000000000000000 900000000421ca84 9000000004620000 9000000004564970\n[    0.000000]         90000000046f7d78 9000000002cc9f70 90000000002c1918 900000000470e000\n[    0.000000]         9000000004564970 90000000040bc0e0 90000000046f7d78 0000000000000000\n[    0.000000]         0000000000004000 90000000045ccd00 0000000000000000 90000000002c1918\n[    0.000000]         90000000002c1900 900000000470b700 9000000004b4df78 9000000004620000\n[    0.000000]         90000000046200a8 90000000046200a8 0000000000000000 9000000004218b2c\n[    0.000000]         9000000004270008 0000000000000001 0000000000000000 90000000045ccd00\n[    0.000000]         ...\n[    0.000000] Call Trace:\n[    0.000000] [<90000000040e3f28>] reserve_bootmem_region+0xfc/0x21c\n[    0.000000] [<900000000421ca84>] memblock_free_all+0x114/0x350\n[    0.000000] [<9000000004218b2c>] mm_core_init+0x138/0x3cc\n[    0.000000] [<9000000004200e38>] start_kernel+0x488/0x7a4\n[    0.000000] [<90000000040df0d8>] kernel_entry+0xd8/0xdc\n[    0.000000]\n[    0.000000] Code: 02eb21ad  00410f4c  380c31ac <262b818d> 6800b70d  02c1c196  0015001c  57fe4bb1  260002cd\n\nThe reason is early memblock_reserve() in memblock_init() set node id to\nMAX_NUMNODES, making NODE_DATA(nid) a NULL dereference in the call chain\nreserve_bootmem_region() -> init_reserved_page(). After memblock_init(),\nthose late calls of memblock_reserve() operate on subregions of memblock\n.memory regions. As a result, these reserved regions will be set to the\ncorrect node at the first iteration of memmap_init_reserved_pages().\n\nSo set all reserved memblocks on Node#0 at initialization can avoid this\npanic."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "1da177e4c3f4",
                                            "version_value": "f105e893a8ed"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.1.56",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.5.6",
                                                        "lessThanOrEqual": "6.5.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/f105e893a8edd48bdf4bef9fef845a9ff402f737",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/f105e893a8edd48bdf4bef9fef845a9ff402f737"
            },
            {
                "url": "https://git.kernel.org/stable/c/19878758accf6b2788091a771d9f9fee7bab11ab",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/19878758accf6b2788091a771d9f9fee7bab11ab"
            },
            {
                "url": "https://git.kernel.org/stable/c/b795fb9f5861ee256070d59e33130980a01fadd7",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/b795fb9f5861ee256070d59e33130980a01fadd7"
            }
        ]
    },
    "generator": {
        "engine": "bippy-a5840b7849dd"
    }
}