cve-2024-53125
Vulnerability from cvelistv5
Published
2024-12-04 14:11
Modified
2024-12-19 18:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: sync_linked_regs() must preserve subreg_def Range propagation must not affect subreg_def marks, otherwise the following example is rewritten by verifier incorrectly when BPF_F_TEST_RND_HI32 flag is set: 0: call bpf_ktime_get_ns call bpf_ktime_get_ns 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff 2: w1 = w0 rewrites w1 = w0 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r) 4: r1 >>= 32 r11 <<= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: exit; if w0 < 0xa goto pc+0 r1 >>= 32 r0 = r1 exit (or zero extension of w1 at (2) is missing for architectures that require zero extension for upper register half). The following happens w/o this patch: - r0 is marked as not a subreg at (0); - w1 is marked as subreg at (2); - w1 subreg_def is overridden at (3) by copy_register_state(); - w1 is read at (5) but mark_insn_zext() does not mark (2) for zero extension, because w1 subreg_def is not set; - because of BPF_F_TEST_RND_HI32 flag verifier inserts random value for hi32 bits of (2) (marked (r)); - this random value is read at (5).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70
Impacted products
Vendor Product Version
Linux Linux Version: 75748837b7e56919679e02163f45d5818c644d03
Version: 75748837b7e56919679e02163f45d5818c644d03
Version: 75748837b7e56919679e02163f45d5818c644d03
Version: 75748837b7e56919679e02163f45d5818c644d03
Version: 75748837b7e56919679e02163f45d5818c644d03
Version: 75748837b7e56919679e02163f45d5818c644d03
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{
   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: "dadf82c1b2608727bcc306843b540cd7414055a7",
                     status: "affected",
                     version: "75748837b7e56919679e02163f45d5818c644d03",
                     versionType: "git",
                  },
                  {
                     lessThan: "b57ac2d92c1f565743f6890a5b9cf317ed856b09",
                     status: "affected",
                     version: "75748837b7e56919679e02163f45d5818c644d03",
                     versionType: "git",
                  },
                  {
                     lessThan: "60fd3538d2a8fd44c41d25088c0ece3e1fd30659",
                     status: "affected",
                     version: "75748837b7e56919679e02163f45d5818c644d03",
                     versionType: "git",
                  },
                  {
                     lessThan: "bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84",
                     status: "affected",
                     version: "75748837b7e56919679e02163f45d5818c644d03",
                     versionType: "git",
                  },
                  {
                     lessThan: "e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0",
                     status: "affected",
                     version: "75748837b7e56919679e02163f45d5818c644d03",
                     versionType: "git",
                  },
                  {
                     lessThan: "e9bd9c498cb0f5843996dbe5cbce7a1836a83c70",
                     status: "affected",
                     version: "75748837b7e56919679e02163f45d5818c644d03",
                     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: "5.10.*",
                     status: "unaffected",
                     version: "5.10.232",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "5.15.*",
                     status: "unaffected",
                     version: "5.15.175",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.121",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.67",
                     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 &= 0x7fffffff       after verifier   r0 &= 0x7fffffff\n  2: w1 = w0                rewrites         w1 = w0\n  3: if w0 < 10 goto +0     -------------->  r11 = 0x2f5674a6     (r)\n  4: r1 >>= 32                               r11 <<= 32           (r)\n  5: r0 = r1                                 r1 |= r11            (r)\n  6: exit;                                   if w0 < 0xa goto pc+0\n                                             r1 >>= 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: "2024-12-19T18:32:41.510Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7",
            },
            {
               url: "https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09",
            },
            {
               url: "https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659",
            },
            {
               url: "https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84",
            },
            {
               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-5f407fcff5a0",
         },
      },
   },
   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: "2024-12-19T18:32:41.510Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-53125\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-04T14:15:20.460\",\"lastModified\":\"2024-12-19T19:15:07.613\",\"vulnStatus\":\"Awaiting Analysis\",\"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 &= 0x7fffffff       after verifier   r0 &= 0x7fffffff\\n  2: w1 = w0                rewrites         w1 = w0\\n  3: if w0 < 10 goto +0     -------------->  r11 = 0x2f5674a6     (r)\\n  4: r1 >>= 32                               r11 <<= 32           (r)\\n  5: r0 = r1                                 r1 |= r11            (r)\\n  6: exit;                                   if w0 < 0xa goto pc+0\\n                                             r1 >>= 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 propagación 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 está establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 &amp;= 0x7fffffff después del verificador r0 &amp;= 0x7fffffff 2: w1 = w0 reescribe w1 = w0 3: si w0 &lt; 10 goto +0 --------------&gt; r11 = 0x2f5674a6 (r) 4: r1 &gt;&gt;= 32 r11 &lt;&lt;= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: salir; si w0 &lt; 0xa goto pc+0 r1 &gt;&gt;= 32 r0 = r1 salir (o falta la extensión cero de w1 en (2) para arquitecturas que requieren extensión cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 está marcado como no un subreg en (0); - w1 está 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 extensión cero, porque el subreg_def de w1 no está 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/60fd3538d2a8fd44c41d25088c0ece3e1fd30659\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"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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