{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2024-49934", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name\n\nIt's observed that a crash occurs during hot-remove a memory device,\nin which user is accessing the hugetlb. See calltrace as following:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 14045 at arch/x86/mm/fault.c:1278 do_user_addr_fault+0x2a0/0x790\nModules linked in: kmem device_dax cxl_mem cxl_pmem cxl_port cxl_pci dax_hmem dax_pmem nd_pmem cxl_acpi nd_btt cxl_core crc32c_intel nvme virtiofs fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc s\nmirror dm_region_hash dm_log dm_mod\nCPU: 1 PID: 14045 Comm: daxctl Not tainted 6.10.0-rc2-lizhijian+ #492\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nRIP: 0010:do_user_addr_fault+0x2a0/0x790\nCode: 48 8b 00 a8 04 0f 84 b5 fe ff ff e9 1c ff ff ff 4c 89 e9 4c 89 e2 be 01 00 00 00 bf 02 00 00 00 e8 b5 ef 24 00 e9 42 fe ff ff <0f> 0b 48 83 c4 08 4c 89 ea 48 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41\nRSP: 0000:ffffc90000a575f0 EFLAGS: 00010046\nRAX: ffff88800c303600 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: 0000000000001000 RSI: ffffffff82504162 RDI: ffffffff824b2c36\nRBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000a57658\nR13: 0000000000001000 R14: ffff88800bc2e040 R15: 0000000000000000\nFS: 00007f51cb57d880(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000001000 CR3: 00000000072e2004 CR4: 00000000001706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n ? __warn+0x8d/0x190\n ? do_user_addr_fault+0x2a0/0x790\n ? report_bug+0x1c3/0x1d0\n ? handle_bug+0x3c/0x70\n ? exc_invalid_op+0x14/0x70\n ? asm_exc_invalid_op+0x16/0x20\n ? do_user_addr_fault+0x2a0/0x790\n ? exc_page_fault+0x31/0x200\n exc_page_fault+0x68/0x200\n<...snip...>\nBUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n ---[ end trace 0000000000000000 ]---\n BUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 14045 Comm: daxctl Kdump: loaded Tainted: G W 6.10.0-rc2-lizhijian+ #492\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n RIP: 0010:dentry_name+0x1f4/0x440\n<...snip...>\n? dentry_name+0x2fa/0x440\nvsnprintf+0x1f3/0x4f0\nvprintk_store+0x23a/0x540\nvprintk_emit+0x6d/0x330\n_printk+0x58/0x80\ndump_mapping+0x10b/0x1a0\n? __pfx_free_object_rcu+0x10/0x10\n__dump_page+0x26b/0x3e0\n? vprintk_emit+0xe0/0x330\n? _printk+0x58/0x80\n? dump_page+0x17/0x50\ndump_page+0x17/0x50\ndo_migrate_range+0x2f7/0x7f0\n? do_migrate_range+0x42/0x7f0\n? offline_pages+0x2f4/0x8c0\noffline_pages+0x60a/0x8c0\nmemory_subsys_offline+0x9f/0x1c0\n? lockdep_hardirqs_on+0x77/0x100\n? _raw_spin_unlock_irqrestore+0x38/0x60\ndevice_offline+0xe3/0x110\nstate_store+0x6e/0xc0\nkernfs_fop_write_iter+0x143/0x200\nvfs_write+0x39f/0x560\nksys_write+0x65/0xf0\ndo_syscall_64+0x62/0x130\n\nPreviously, some sanity check have been done in dump_mapping() before\nthe print facility parsing '%pd' though, it's still possible to run into\nan invalid dentry.d_name.name.\n\nSince dump_mapping() only needs to dump the filename only, retrieve it\nby itself in a safer way to prevent an unnecessary crash.\n\nNote that either retrieving the filename with '%pd' or\nstrncpy_from_kernel_nofault(), the filename could be unreliable." } ] }, "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": "f92b8829c6e7" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.12-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/f92b8829c6e75632de4e2b9f70e7a7e6c5c2ba98", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/f92b8829c6e75632de4e2b9f70e7a7e6c5c2ba98" }, { "url": "https://git.kernel.org/stable/c/ef921bc72328b577cb45772ff7921cba4773b74a", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/ef921bc72328b577cb45772ff7921cba4773b74a" }, { "url": "https://git.kernel.org/stable/c/7f7b850689ac06a62befe26e1fd1806799e7f152", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/7f7b850689ac06a62befe26e1fd1806799e7f152" } ] }, "generator": { "engine": "bippy-c9c4e1df01b2" } }