cve-2024-42161
Vulnerability from cvelistv5
Published
2024-07-30 07:47
Modified
2024-12-19 09:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD [Changes from V1: - Use a default branch in the switch statement to initialize `val'.] GCC warns that `val' may be used uninitialized in the BPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as: [...] unsigned long long val; \ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6dbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974affPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff941a8449e712eaf7efca1a13bfb9afd3d99fc2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6dbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974affPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff941a8449e712eaf7efca1a13bfb9afd3d99fc2Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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break;\\t\\t\\t      \\\\\\n\\tcase 2: val = *(const unsigned short *)p; break;\\t\\t      \\\\\\n\\tcase 4: val = *(const unsigned int *)p; break;\\t\\t\\t      \\\\\\n\\tcase 8: val = *(const unsigned long long *)p; break;\\t\\t      \\\\\\n        }       \\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\t[...]\\n\\tval;\\t\\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\t}\\t\\t\\t\\t\\t\\t\\t\\t      \\\\\\n\\nThis patch adds a default entry in the switch statement that sets\\n`val' to zero in order to avoid the warning, and random values to be\\nused in case __builtin_preserve_field_info returns unexpected values\\nfor BPF_FIELD_BYTE_SIZE.\\n\\nTested in bpf-next master.\\nNo regressions.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:38:32.790Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-42161\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:38:32.790Z\", \"dateReserved\": \"2024-07-29T15:50:41.196Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-30T07:47:03.136Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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