cve-2024-47702
Vulnerability from cvelistv5
Published
2024-10-21 11:53
Modified
2024-12-19 09:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fail verification for sign-extension of packet data/data_end/data_meta syzbot reported a kernel crash due to commit 1f1e864b6555 ("bpf: Handle sign-extenstin ctx member accesses"). The reason is due to sign-extension of 32-bit load for packet data/data_end/data_meta uapi field. The original code looks like: r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */ r3 = *(u32 *)(r1 + 80) /* load __sk_buff->data_end */ r0 = r2 r0 += 8 if r3 > r0 goto +1 ... Note that __sk_buff->data load has 32-bit sign extension. After verification and convert_ctx_accesses(), the final asm code looks like: r2 = *(u64 *)(r1 +208) r2 = (s32)r2 r3 = *(u64 *)(r1 +80) r0 = r2 r0 += 8 if r3 > r0 goto pc+1 ... Note that 'r2 = (s32)r2' may make the kernel __sk_buff->data address invalid which may cause runtime failure. Currently, in C code, typically we have void *data = (void *)(long)skb->data; void *data_end = (void *)(long)skb->data_end; ... and it will generate r2 = *(u64 *)(r1 +208) r3 = *(u64 *)(r1 +80) r0 = r2 r0 += 8 if r3 > r0 goto pc+1 If we allow sign-extension, void *data = (void *)(long)(int)skb->data; void *data_end = (void *)(long)skb->data_end; ... the generated code looks like r2 = *(u64 *)(r1 +208) r2 <<= 32 r2 s>>= 32 r3 = *(u64 *)(r1 +80) r0 = r2 r0 += 8 if r3 > r0 goto pc+1 and this will cause verification failure since "r2 <<= 32" is not allowed as "r2" is a packet pointer. To fix this issue for case r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */ this patch added additional checking in is_valid_access() callback function for packet data/data_end/data_meta access. If those accesses are with sign-extenstion, the verification will fail. [1] https://lore.kernel.org/bpf/000000000000c90eee061d236d37@google.com/
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92de36080c93296ef9005690705cba260b9bd68aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f09757fe97a225ae505886eac572e4cbfba96537Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1620c93a1ec950d87ef327a565d3907736d3340Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1f1e864b65554e33fe74e3377e58b12f4302f2eb
Version: 1f1e864b65554e33fe74e3377e58b12f4302f2eb
Version: 1f1e864b65554e33fe74e3377e58b12f4302f2eb
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   Linux Linux Version: 6.6
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                        id: "CVE-2024-47702",
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               programFiles: [
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               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fail verification for sign-extension of packet data/data_end/data_meta\n\nsyzbot reported a kernel crash due to\n  commit 1f1e864b6555 (\"bpf: Handle sign-extenstin ctx member accesses\").\nThe reason is due to sign-extension of 32-bit load for\npacket data/data_end/data_meta uapi field.\n\nThe original code looks like:\n        r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\n        r3 = *(u32 *)(r1 + 80) /* load __sk_buff->data_end */\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto +1\n        ...\nNote that __sk_buff->data load has 32-bit sign extension.\n\nAfter verification and convert_ctx_accesses(), the final asm code looks like:\n        r2 = *(u64 *)(r1 +208)\n        r2 = (s32)r2\n        r3 = *(u64 *)(r1 +80)\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto pc+1\n        ...\nNote that 'r2 = (s32)r2' may make the kernel __sk_buff->data address invalid\nwhich may cause runtime failure.\n\nCurrently, in C code, typically we have\n        void *data = (void *)(long)skb->data;\n        void *data_end = (void *)(long)skb->data_end;\n        ...\nand it will generate\n        r2 = *(u64 *)(r1 +208)\n        r3 = *(u64 *)(r1 +80)\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto pc+1\n\nIf we allow sign-extension,\n        void *data = (void *)(long)(int)skb->data;\n        void *data_end = (void *)(long)skb->data_end;\n        ...\nthe generated code looks like\n        r2 = *(u64 *)(r1 +208)\n        r2 <<= 32\n        r2 s>>= 32\n        r3 = *(u64 *)(r1 +80)\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto pc+1\nand this will cause verification failure since \"r2 <<= 32\" is not allowed\nas \"r2\" is a packet pointer.\n\nTo fix this issue for case\n  r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\nthis patch added additional checking in is_valid_access() callback\nfunction for packet data/data_end/data_meta access. If those accesses\nare with sign-extenstion, the verification will fail.\n\n  [1] https://lore.kernel.org/bpf/000000000000c90eee061d236d37@google.com/",
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         title: "bpf: Fail verification for sign-extension of packet data/data_end/data_meta",
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   cveMetadata: {
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      assignerShortName: "Linux",
      cveId: "CVE-2024-47702",
      datePublished: "2024-10-21T11:53:37.958Z",
      dateReserved: "2024-09-30T16:00:12.945Z",
      dateUpdated: "2024-12-19T09:26:24.243Z",
      state: "PUBLISHED",
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-47702\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T12:15:06.743\",\"lastModified\":\"2024-10-24T13:30:59.247\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fail verification for sign-extension of packet data/data_end/data_meta\\n\\nsyzbot reported a kernel crash due to\\n  commit 1f1e864b6555 (\\\"bpf: Handle sign-extenstin ctx member accesses\\\").\\nThe reason is due to sign-extension of 32-bit load for\\npacket data/data_end/data_meta uapi field.\\n\\nThe original code looks like:\\n        r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\\n        r3 = *(u32 *)(r1 + 80) /* load __sk_buff->data_end */\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto +1\\n        ...\\nNote that __sk_buff->data load has 32-bit sign extension.\\n\\nAfter verification and convert_ctx_accesses(), the final asm code looks like:\\n        r2 = *(u64 *)(r1 +208)\\n        r2 = (s32)r2\\n        r3 = *(u64 *)(r1 +80)\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto pc+1\\n        ...\\nNote that 'r2 = (s32)r2' may make the kernel __sk_buff->data address invalid\\nwhich may cause runtime failure.\\n\\nCurrently, in C code, typically we have\\n        void *data = (void *)(long)skb->data;\\n        void *data_end = (void *)(long)skb->data_end;\\n        ...\\nand it will generate\\n        r2 = *(u64 *)(r1 +208)\\n        r3 = *(u64 *)(r1 +80)\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto pc+1\\n\\nIf we allow sign-extension,\\n        void *data = (void *)(long)(int)skb->data;\\n        void *data_end = (void *)(long)skb->data_end;\\n        ...\\nthe generated code looks like\\n        r2 = *(u64 *)(r1 +208)\\n        r2 <<= 32\\n        r2 s>>= 32\\n        r3 = *(u64 *)(r1 +80)\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto pc+1\\nand this will cause verification failure since \\\"r2 <<= 32\\\" is not allowed\\nas \\\"r2\\\" is a packet pointer.\\n\\nTo fix this issue for case\\n  r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\\nthis patch added additional checking in is_valid_access() callback\\nfunction for packet data/data_end/data_meta access. If those accesses\\nare with sign-extenstion, the verification will fail.\\n\\n  [1] https://lore.kernel.org/bpf/000000000000c90eee061d236d37@google.com/\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Error en la verificación de la extensión de signo del paquete data/data_end/data_meta syzbot informó de un fallo del kernel debido a el commit 1f1e864b6555 (\\\"bpf: Manejar los accesos a miembros ctx de la extensión de signo\\\"). La razón se debe a la extensión de signo de la carga de 32 bits para el campo uapi del paquete data/data_end/data_meta. El código original se ve así: r2 = *(s32 *)(r1 + 76) /* load __sk_buff-&gt;data */ r3 = *(u32 *)(r1 + 80) /* load __sk_buff-&gt;data_end */ r0 = r2 r0 += 8 if r3 &gt; r0 goto +1 ... Tenga en cuenta que la carga de __sk_buff-&gt;data tiene una extensión de signo de 32 bits. Después de la verificación y convert_ctx_accesses(), el código asm final se ve así: r2 = *(u64 *)(r1 +208) r2 = (s32)r2 r3 = *(u64 *)(r1 +80) r0 = r2 r0 += 8 if r3 &gt; r0 goto pc+1 ... Tenga en cuenta que 'r2 = (s32)r2' puede hacer que la dirección __sk_buff-&gt;data del núcleo sea inválida, lo que puede causar un error en tiempo de ejecución. Actualmente, en el código C, normalmente tenemos void *data = (void *)(long)skb-&gt;data; void *data_end = (void *)(long)skb-&gt;data_end; ... y generará r2 = *(u64 *)(r1 +208) r3 = *(u64 *)(r1 +80) r0 = r2 r0 += 8 if r3 &gt; r0 goto pc+1 Si permitimos la extensión de signo, void *data = (void *)(long)(int)skb-&gt;data; void *data_end = (void *)(long)skb-&gt;data_end; ... el código generado se ve así r2 = *(u64 *)(r1 +208) r2 &lt;&lt;= 32 r2 s&gt;&gt;= 32 r3 = *(u64 *)(r1 +80) r0 = r2 r0 += 8 if r3 &gt; r0 goto pc+1 y esto causará un error de verificación ya que \\\"r2 &lt;&lt;= 32\\\" no está permitido ya que \\\"r2\\\" es un puntero de paquete. Para solucionar este problema en el caso r2 = *(s32 *)(r1 + 76) /* load __sk_buff-&gt;data */, este parche agregó una verificación adicional en la función de devolución de llamada is_valid_access() para el acceso a los paquetes data/data_end/data_meta. Si esos accesos son con la extensión sign-extenstion, la verificación fallará. [1] https://lore.kernel.org/bpf/000000000000c90eee061d236d37@google.com/\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6\",\"versionEndExcluding\":\"6.10.13\",\"matchCriteriaId\":\"5E608BB9-C140-4A10-AE7A-FC5B5D4C1972\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.2\",\"matchCriteriaId\":\"AB755D26-97F4-43B6-8604-CD076811E181\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/92de36080c93296ef9005690705cba260b9bd68a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f09757fe97a225ae505886eac572e4cbfba96537\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f1620c93a1ec950d87ef327a565d3907736d3340\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-47702\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-21T13:04:24.861686Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-21T13:04:28.636Z\"}}], \"cna\": {\"title\": \"bpf: Fail verification for sign-extension of packet data/data_end/data_meta\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1f1e864b65554e33fe74e3377e58b12f4302f2eb\", \"lessThan\": \"f1620c93a1ec950d87ef327a565d3907736d3340\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f1e864b65554e33fe74e3377e58b12f4302f2eb\", \"lessThan\": \"f09757fe97a225ae505886eac572e4cbfba96537\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f1e864b65554e33fe74e3377e58b12f4302f2eb\", \"lessThan\": \"92de36080c93296ef9005690705cba260b9bd68a\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/bpf.h\", \"kernel/bpf/verifier.c\", \"net/core/filter.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.10.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/bpf.h\", \"kernel/bpf/verifier.c\", \"net/core/filter.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f1620c93a1ec950d87ef327a565d3907736d3340\"}, {\"url\": \"https://git.kernel.org/stable/c/f09757fe97a225ae505886eac572e4cbfba96537\"}, {\"url\": \"https://git.kernel.org/stable/c/92de36080c93296ef9005690705cba260b9bd68a\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fail verification for sign-extension of packet data/data_end/data_meta\\n\\nsyzbot reported a kernel crash due to\\n  commit 1f1e864b6555 (\\\"bpf: Handle sign-extenstin ctx member accesses\\\").\\nThe reason is due to sign-extension of 32-bit load for\\npacket data/data_end/data_meta uapi field.\\n\\nThe original code looks like:\\n        r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\\n        r3 = *(u32 *)(r1 + 80) /* load __sk_buff->data_end */\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto +1\\n        ...\\nNote that __sk_buff->data load has 32-bit sign extension.\\n\\nAfter verification and convert_ctx_accesses(), the final asm code looks like:\\n        r2 = *(u64 *)(r1 +208)\\n        r2 = (s32)r2\\n        r3 = *(u64 *)(r1 +80)\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto pc+1\\n        ...\\nNote that 'r2 = (s32)r2' may make the kernel __sk_buff->data address invalid\\nwhich may cause runtime failure.\\n\\nCurrently, in C code, typically we have\\n        void *data = (void *)(long)skb->data;\\n        void *data_end = (void *)(long)skb->data_end;\\n        ...\\nand it will generate\\n        r2 = *(u64 *)(r1 +208)\\n        r3 = *(u64 *)(r1 +80)\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto pc+1\\n\\nIf we allow sign-extension,\\n        void *data = (void *)(long)(int)skb->data;\\n        void *data_end = (void *)(long)skb->data_end;\\n        ...\\nthe generated code looks like\\n        r2 = *(u64 *)(r1 +208)\\n        r2 <<= 32\\n        r2 s>>= 32\\n        r3 = *(u64 *)(r1 +80)\\n        r0 = r2\\n        r0 += 8\\n        if r3 > r0 goto pc+1\\nand this will cause verification failure since \\\"r2 <<= 32\\\" is not allowed\\nas \\\"r2\\\" is a packet pointer.\\n\\nTo fix this issue for case\\n  r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\\nthis patch added additional checking in is_valid_access() callback\\nfunction for packet data/data_end/data_meta access. If those accesses\\nare with sign-extenstion, the verification will fail.\\n\\n  [1] https://lore.kernel.org/bpf/000000000000c90eee061d236d37@google.com/\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:26:24.243Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-47702\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:26:24.243Z\", \"dateReserved\": \"2024-09-30T16:00:12.945Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T11:53:37.958Z\", \"assignerShortName\": \"Linux\"}",
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}


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