{ "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\nbpf: Fix overloading of MEM_UNINIT's meaning\n\nLonial reported an issue in the BPF verifier where check_mem_size_reg()\nhas the following code:\n\n if (!tnum_is_const(reg->var_off))\n /* For unprivileged variable accesses, disable raw\n * mode so that the program is required to\n * initialize all the memory that the helper could\n * just partially fill up.\n */\n meta = NULL;\n\nThis means that writes are not checked when the register containing the\nsize of the passed buffer has not a fixed size. Through this bug, a BPF\nprogram can write to a map which is marked as read-only, for example,\n.rodata global maps.\n\nThe problem is that MEM_UNINIT's initial meaning that \"the passed buffer\nto the BPF helper does not need to be initialized\" which was added back\nin commit 435faee1aae9 (\"bpf, verifier: add ARG_PTR_TO_RAW_STACK type\")\ngot overloaded over time with \"the passed buffer is being written to\".\n\nThe problem however is that checks such as the above which were added later\nvia 06c1c049721a (\"bpf: allow helpers access to variable memory\") set meta\nto NULL in order force the user to always initialize the passed buffer to\nthe helper. Due to the current double meaning of MEM_UNINIT, this bypasses\nverifier write checks to the memory (not boundary checks though) and only\nassumes the latter memory is read instead.\n\nFix this by reverting MEM_UNINIT back to its original meaning, and having\nMEM_WRITE as an annotation to BPF helpers in order to then trigger the\nBPF verifier checks for writing to memory.\n\nSome notes: check_arg_pair_ok() ensures that for ARG_CONST_SIZE{,_OR_ZERO}\nwe can access fn->arg_type[arg - 1] since it must contain a preceding\nARG_PTR_TO_MEM. For check_mem_reg() the meta argument can be removed\naltogether since we do check both BPF_READ and BPF_WRITE. Same for the\nequivalent check_kfunc_mem_size_reg().", "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-2024-50164" }, { "summary":"CVE-2024-50164 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-50164.json" }, { "summary":"openEuler-SA-2024-2522", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-2522" }, { "summary":"CVE-2024-50164", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-50164&packageName=kernel" } ], "title":"openEuler cve CVE-2024-50164", "tracking":{ "initial_release_date":"2024-12-06T23:24:04+08:00", "revision_history":[ { "date":"2024-12-06T23:24:04+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2024-12-06T23:24:04+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-12-06T23:24:04+08:00", "id":"CVE-2024-50164", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"openEuler-24.03-LTS", "name":"openEuler-24.03-LTS" }, "name":"openEuler-24.03-LTS", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"bpftool-6.6.0-61.0.0.60.oe2403.aarch64.rpm", "name":"bpftool-6.6.0-61.0.0.60.oe2403.aarch64.rpm" }, "name":"bpftool-6.6.0-61.0.0.60.oe2403.aarch64.rpm", 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means that writes are not checked when the register containing the\nsize of the passed buffer has not a fixed size. Through this bug, a BPF\nprogram can write to a map which is marked as read-only, for example,\n.rodata global maps.\n\nThe problem is that MEM_UNINIT's initial meaning that \"the passed buffer\nto the BPF helper does not need to be initialized\" which was added back\nin commit 435faee1aae9 (\"bpf, verifier: add ARG_PTR_TO_RAW_STACK type\")\ngot overloaded over time with \"the passed buffer is being written to\".\n\nThe problem however is that checks such as the above which were added later\nvia 06c1c049721a (\"bpf: allow helpers access to variable memory\") set meta\nto NULL in order force the user to always initialize the passed buffer to\nthe helper. Due to the current double meaning of MEM_UNINIT, this bypasses\nverifier write checks to the memory (not boundary checks though) and only\nassumes the latter memory is read instead.\n\nFix this by reverting MEM_UNINIT back to its original meaning, and having\nMEM_WRITE as an annotation to BPF helpers in order to then trigger the\nBPF verifier checks for writing to memory.\n\nSome notes: check_arg_pair_ok() ensures that for ARG_CONST_SIZE{,_OR_ZERO}\nwe can access fn->arg_type[arg - 1] since it must contain a preceding\nARG_PTR_TO_MEM. For check_mem_reg() the meta argument can be removed\naltogether since we do check both BPF_READ and BPF_WRITE. Same for the\nequivalent check_kfunc_mem_size_reg().", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-devel-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-headers-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-source-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-debuginfo-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-devel-6.6.0-61.0.0.60.oe2403.aarch64", "openEuler-24.03-LTS:perf-6.6.0-61.0.0.60.oe2403.aarch64", 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"openEuler-24.03-LTS:kernel-6.6.0-61.0.0.60.oe2403.src" ] } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2024-50164" } ] }