cve-2024-53125
Vulnerability from cvelistv5
Published
2024-12-04 14:11
Modified
2024-12-04 14:11
Severity ?
EPSS score ?
Summary
bpf: sync_linked_regs() must preserve subreg_def
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/bpf/verifier.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "e2ef0f317a52",
"status": "affected",
"version": "75748837b7e5",
"versionType": "git"
},
{
"lessThan": "e9bd9c498cb0",
"status": "affected",
"version": "75748837b7e5",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/bpf/verifier.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.11.*",
"status": "unaffected",
"version": "6.11.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.12",
"versionType": "original_commit_for_fix"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sync_linked_regs() must preserve subreg_def\n\nRange propagation must not affect subreg_def marks, otherwise the\nfollowing example is rewritten by verifier incorrectly when\nBPF_F_TEST_RND_HI32 flag is set:\n\n 0: call bpf_ktime_get_ns call bpf_ktime_get_ns\n 1: r0 \u0026= 0x7fffffff after verifier r0 \u0026= 0x7fffffff\n 2: w1 = w0 rewrites w1 = w0\n 3: if w0 \u003c 10 goto +0 --------------\u003e r11 = 0x2f5674a6 (r)\n 4: r1 \u003e\u003e= 32 r11 \u003c\u003c= 32 (r)\n 5: r0 = r1 r1 |= r11 (r)\n 6: exit; if w0 \u003c 0xa goto pc+0\n r1 \u003e\u003e= 32\n r0 = r1\n exit\n\n(or zero extension of w1 at (2) is missing for architectures that\n require zero extension for upper register half).\n\nThe following happens w/o this patch:\n- r0 is marked as not a subreg at (0);\n- w1 is marked as subreg at (2);\n- w1 subreg_def is overridden at (3) by copy_register_state();\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\n for zero extension, because w1 subreg_def is not set;\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\n value for hi32 bits of (2) (marked (r));\n- this random value is read at (5)."
}
],
"providerMetadata": {
"dateUpdated": "2024-12-04T14:11:09.326Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0"
},
{
"url": "https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70"
}
],
"title": "bpf: sync_linked_regs() must preserve subreg_def",
"x_generator": {
"engine": "bippy-8e903de6a542"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-53125",
"datePublished": "2024-12-04T14:11:09.326Z",
"dateReserved": "2024-11-19T17:17:24.995Z",
"dateUpdated": "2024-12-04T14:11:09.326Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2024-53125\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-04T14:15:20.460\",\"lastModified\":\"2024-12-04T14:15:20.460\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: sync_linked_regs() must preserve subreg_def\\n\\nRange propagation must not affect subreg_def marks, otherwise the\\nfollowing example is rewritten by verifier incorrectly when\\nBPF_F_TEST_RND_HI32 flag is set:\\n\\n 0: call bpf_ktime_get_ns call bpf_ktime_get_ns\\n 1: r0 \u0026= 0x7fffffff after verifier r0 \u0026= 0x7fffffff\\n 2: w1 = w0 rewrites w1 = w0\\n 3: if w0 \u003c 10 goto +0 --------------\u003e r11 = 0x2f5674a6 (r)\\n 4: r1 \u003e\u003e= 32 r11 \u003c\u003c= 32 (r)\\n 5: r0 = r1 r1 |= r11 (r)\\n 6: exit; if w0 \u003c 0xa goto pc+0\\n r1 \u003e\u003e= 32\\n r0 = r1\\n exit\\n\\n(or zero extension of w1 at (2) is missing for architectures that\\n require zero extension for upper register half).\\n\\nThe following happens w/o this patch:\\n- r0 is marked as not a subreg at (0);\\n- w1 is marked as subreg at (2);\\n- w1 subreg_def is overridden at (3) by copy_register_state();\\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\\n for zero extension, because w1 subreg_def is not set;\\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\\n value for hi32 bits of (2) (marked (r));\\n- this random value is read at (5).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: sync_linked_regs() debe preservar subreg_def La propagaci\u00f3n del rango no debe afectar a las marcas subreg_def, de lo contrario el siguiente ejemplo es reescrito incorrectamente por el verificador cuando el indicador BPF_F_TEST_RND_HI32 est\u00e1 establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 \u0026amp;= 0x7fffffff despu\u00e9s del verificador r0 \u0026amp;= 0x7fffffff 2: w1 = w0 reescribe w1 = w0 3: si w0 \u0026lt; 10 goto +0 --------------\u0026gt; r11 = 0x2f5674a6 (r) 4: r1 \u0026gt;\u0026gt;= 32 r11 \u0026lt;\u0026lt;= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: salir; si w0 \u0026lt; 0xa goto pc+0 r1 \u0026gt;\u0026gt;= 32 r0 = r1 salir (o falta la extensi\u00f3n cero de w1 en (2) para arquitecturas que requieren extensi\u00f3n cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 est\u00e1 marcado como no un subreg en (0); - w1 est\u00e1 marcado como subreg en (2); - el subreg_def de w1 es anulado en (3) por copy_register_state(); - w1 se lee en (5) pero mark_insn_zext() no marca (2) para extensi\u00f3n cero, porque el subreg_def de w1 no est\u00e1 configurado; - debido al indicador BPF_F_TEST_RND_HI32, el verificador inserta un valor aleatorio para los bits hi32 de (2) (marcado (r)); - este valor aleatorio se lee en (5).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
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|---|
Nomenclature
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