{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: shmem: fix getting incorrect lruvec when replacing a shmem folio\n\nWhen testing shmem swapin, I encountered the warning below on my machine. \nThe reason is that replacing an old shmem folio with a new one causes\nmem_cgroup_migrate() to clear the old folio's memcg data. As a result,\nthe old folio cannot get the correct memcg's lruvec needed to remove\nitself from the LRU list when it is being freed. This could lead to\npossible serious problems, such as LRU list crashes due to holding the\nwrong LRU lock, and incorrect LRU statistics.\n\nTo fix this issue, we can fallback to use the mem_cgroup_replace_folio()\nto replace the old shmem folio.\n\n[ 5241.100311] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5d9960\n[ 5241.100317] head: order:4 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n[ 5241.100319] flags: 0x17fffe0000040068(uptodate|lru|head|swapbacked|node=0|zone=2|lastcpupid=0x3ffff)\n[ 5241.100323] raw: 17fffe0000040068 fffffdffd6687948 fffffdffd69ae008 0000000000000000\n[ 5241.100325] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 5241.100326] head: 17fffe0000040068 fffffdffd6687948 fffffdffd69ae008 0000000000000000\n[ 5241.100327] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 5241.100328] head: 17fffe0000000204 fffffdffd6665801 ffffffffffffffff 0000000000000000\n[ 5241.100329] head: 0000000a00000010 0000000000000000 00000000ffffffff 0000000000000000\n[ 5241.100330] page dumped because: VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled())\n[ 5241.100338] ------------[ cut here ]------------\n[ 5241.100339] WARNING: CPU: 19 PID: 78402 at include/linux/memcontrol.h:775 folio_lruvec_lock_irqsave+0x140/0x150\n[...]\n[ 5241.100374] pc : folio_lruvec_lock_irqsave+0x140/0x150\n[ 5241.100375] lr : folio_lruvec_lock_irqsave+0x138/0x150\n[ 5241.100376] sp : ffff80008b38b930\n[...]\n[ 5241.100398] Call trace:\n[ 5241.100399] folio_lruvec_lock_irqsave+0x140/0x150\n[ 5241.100401] __page_cache_release+0x90/0x300\n[ 5241.100404] __folio_put+0x50/0x108\n[ 5241.100406] shmem_replace_folio+0x1b4/0x240\n[ 5241.100409] shmem_swapin_folio+0x314/0x528\n[ 5241.100411] shmem_get_folio_gfp+0x3b4/0x930\n[ 5241.100412] shmem_fault+0x74/0x160\n[ 5241.100414] __do_fault+0x40/0x218\n[ 5241.100417] do_shared_fault+0x34/0x1b0\n[ 5241.100419] do_fault+0x40/0x168\n[ 5241.100420] handle_pte_fault+0x80/0x228\n[ 5241.100422] __handle_mm_fault+0x1c4/0x440\n[ 5241.100424] handle_mm_fault+0x60/0x1f0\n[ 5241.100426] do_page_fault+0x120/0x488\n[ 5241.100429] do_translation_fault+0x4c/0x68\n[ 5241.100431] do_mem_abort+0x48/0xa0\n[ 5241.100434] el0_da+0x38/0xc0\n[ 5241.100436] el0t_64_sync_handler+0x68/0xc0\n[ 5241.100437] el0t_64_sync+0x14c/0x150\n[ 5241.100439] ---[ end trace 0000000000000000 ]---\n\n[baolin.wang@linux.alibaba.com: remove less helpful comments, per Matthew]\n Link: https://lkml.kernel.org/r/ccad3fe1375b468ebca3227b6b729f3eaf9d8046.1718423197.git.baolin.wang@linux.alibaba.com", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-40949" }, { "summary":"CVE-2024-40949 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-40949.json" }, { "summary":"openEuler-SA-2025-1097", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1097" }, { "summary":"CVE-2024-40949", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-40949&packageName=kernel" } ], "title":"openEuler cve CVE-2024-40949", "tracking":{ "initial_release_date":"2025-02-08T20:33:46+08:00", "revision_history":[ { "date":"2025-02-08T20:33:46+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2025-02-08T20:33:46+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2025-02-08T20:33:46+08:00", "id":"CVE-2024-40949", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", 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fix getting incorrect lruvec when replacing a shmem folio\n\nWhen testing shmem swapin, I encountered the warning below on my machine. \nThe reason is that replacing an old shmem folio with a new one causes\nmem_cgroup_migrate() to clear the old folio's memcg data. As a result,\nthe old folio cannot get the correct memcg's lruvec needed to remove\nitself from the LRU list when it is being freed. This could lead to\npossible serious problems, such as LRU list crashes due to holding the\nwrong LRU lock, and incorrect LRU statistics.\n\nTo fix this issue, we can fallback to use the mem_cgroup_replace_folio()\nto replace the old shmem folio.\n\n[ 5241.100311] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5d9960\n[ 5241.100317] head: order:4 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n[ 5241.100319] flags: 0x17fffe0000040068(uptodate|lru|head|swapbacked|node=0|zone=2|lastcpupid=0x3ffff)\n[ 5241.100323] raw: 17fffe0000040068 fffffdffd6687948 fffffdffd69ae008 0000000000000000\n[ 5241.100325] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 5241.100326] head: 17fffe0000040068 fffffdffd6687948 fffffdffd69ae008 0000000000000000\n[ 5241.100327] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n[ 5241.100328] head: 17fffe0000000204 fffffdffd6665801 ffffffffffffffff 0000000000000000\n[ 5241.100329] head: 0000000a00000010 0000000000000000 00000000ffffffff 0000000000000000\n[ 5241.100330] page dumped because: VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled())\n[ 5241.100338] ------------[ cut here ]------------\n[ 5241.100339] WARNING: CPU: 19 PID: 78402 at include/linux/memcontrol.h:775 folio_lruvec_lock_irqsave+0x140/0x150\n[...]\n[ 5241.100374] pc : folio_lruvec_lock_irqsave+0x140/0x150\n[ 5241.100375] lr : folio_lruvec_lock_irqsave+0x138/0x150\n[ 5241.100376] sp : ffff80008b38b930\n[...]\n[ 5241.100398] Call trace:\n[ 5241.100399] folio_lruvec_lock_irqsave+0x140/0x150\n[ 5241.100401] __page_cache_release+0x90/0x300\n[ 5241.100404] __folio_put+0x50/0x108\n[ 5241.100406] shmem_replace_folio+0x1b4/0x240\n[ 5241.100409] shmem_swapin_folio+0x314/0x528\n[ 5241.100411] shmem_get_folio_gfp+0x3b4/0x930\n[ 5241.100412] shmem_fault+0x74/0x160\n[ 5241.100414] __do_fault+0x40/0x218\n[ 5241.100417] do_shared_fault+0x34/0x1b0\n[ 5241.100419] do_fault+0x40/0x168\n[ 5241.100420] handle_pte_fault+0x80/0x228\n[ 5241.100422] __handle_mm_fault+0x1c4/0x440\n[ 5241.100424] handle_mm_fault+0x60/0x1f0\n[ 5241.100426] do_page_fault+0x120/0x488\n[ 5241.100429] do_translation_fault+0x4c/0x68\n[ 5241.100431] do_mem_abort+0x48/0xa0\n[ 5241.100434] el0_da+0x38/0xc0\n[ 5241.100436] el0t_64_sync_handler+0x68/0xc0\n[ 5241.100437] el0t_64_sync+0x14c/0x150\n[ 5241.100439] ---[ end trace 0000000000000000 ]---\n\n[baolin.wang@linux.alibaba.com: remove less helpful comments, per Matthew]\n Link: https://lkml.kernel.org/r/ccad3fe1375b468ebca3227b6b729f3eaf9d8046.1718423197.git.baolin.wang@linux.alibaba.com", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-76.0.0.69.oe2403.aarch64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-76.0.0.69.oe2403.aarch64", "openEuler-24.03-LTS:kernel-6.6.0-76.0.0.69.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-76.0.0.69.oe2403.aarch64", 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