ghsa-rf8w-hqgx-f6g8
Vulnerability from github
Published
2024-03-06 09:30
Modified
2024-03-06 09:30
Details

In the Linux kernel, the following vulnerability has been resolved:

libbpf: Fix NULL pointer dereference in bpf_object__collect_prog_relos

An issue occurred while reading an ELF file in libbpf.c during fuzzing:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206
4206 in libbpf.c
(gdb) bt
#0 0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206
#1 0x000000000094f9d6 in bpf_object.collect_relos () at libbpf.c:6706
#2 0x000000000092bef3 in bpf_object_open () at libbpf.c:7437
#3 0x000000000092c046 in bpf_object.open_mem () at libbpf.c:7497
#4 0x0000000000924afa in LLVMFuzzerTestOneInput () at fuzz/bpf-object-fuzzer.c:16
#5 0x000000000060be11 in testblitz_engine::fuzzer::Fuzzer::run_one ()
#6 0x000000000087ad92 in tracing::span::Span::in_scope ()
#7 0x00000000006078aa in testblitz_engine::fuzzer::util::walkdir ()
#8 0x00000000005f3217 in testblitz_engine::entrypoint::main::{{closure}} ()
#9 0x00000000005f2601 in main ()
(gdb)

scn_data was null at this code(tools/lib/bpf/src/libbpf.c):

if (rel->r_offset % BPF_INSN_SZ || rel->r_offset >= scn_data->d_size) {

The scn_data is derived from the code above:

scn = elf_sec_by_idx(obj, sec_idx);
scn_data = elf_sec_data(obj, scn);

relo_sec_name = elf_sec_str(obj, shdr->sh_name);
sec_name = elf_sec_name(obj, scn);
if (!relo_sec_name || !sec_name)// don't check whether scn_data is NULL
    return -EINVAL;

In certain special scenarios, such as reading a malformed ELF file, it is possible that scn_data may be a null pointer

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2023-52592"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-03-06T07:15:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibbpf: Fix NULL pointer dereference in bpf_object__collect_prog_relos\n\nAn issue occurred while reading an ELF file in libbpf.c during fuzzing:\n\n\tProgram received signal SIGSEGV, Segmentation fault.\n\t0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206\n\t4206 in libbpf.c\n\t(gdb) bt\n\t#0 0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206\n\t#1 0x000000000094f9d6 in bpf_object.collect_relos () at libbpf.c:6706\n\t#2 0x000000000092bef3 in bpf_object_open () at libbpf.c:7437\n\t#3 0x000000000092c046 in bpf_object.open_mem () at libbpf.c:7497\n\t#4 0x0000000000924afa in LLVMFuzzerTestOneInput () at fuzz/bpf-object-fuzzer.c:16\n\t#5 0x000000000060be11 in testblitz_engine::fuzzer::Fuzzer::run_one ()\n\t#6 0x000000000087ad92 in tracing::span::Span::in_scope ()\n\t#7 0x00000000006078aa in testblitz_engine::fuzzer::util::walkdir ()\n\t#8 0x00000000005f3217 in testblitz_engine::entrypoint::main::{{closure}} ()\n\t#9 0x00000000005f2601 in main ()\n\t(gdb)\n\nscn_data was null at this code(tools/lib/bpf/src/libbpf.c):\n\n\tif (rel-\u003er_offset % BPF_INSN_SZ || rel-\u003er_offset \u003e= scn_data-\u003ed_size) {\n\nThe scn_data is derived from the code above:\n\n\tscn = elf_sec_by_idx(obj, sec_idx);\n\tscn_data = elf_sec_data(obj, scn);\n\n\trelo_sec_name = elf_sec_str(obj, shdr-\u003esh_name);\n\tsec_name = elf_sec_name(obj, scn);\n\tif (!relo_sec_name || !sec_name)// don\u0027t check whether scn_data is NULL\n\t\treturn -EINVAL;\n\nIn certain special scenarios, such as reading a malformed ELF file,\nit is possible that scn_data may be a null pointer",
  "id": "GHSA-rf8w-hqgx-f6g8",
  "modified": "2024-03-06T09:30:27Z",
  "published": "2024-03-06T09:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52592"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12473265f50c1e27b0dfd9735738ac418c4bfcce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f3e436832e86b826a6450eb8d1aaa51205a758e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90dbf4535668042fac0d7201ce9e2c8c770c578a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab26541270c722eedf8eefd62797c3ce3d18a91b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc3a5534e2a8855427403113cbeb54af5837bbe0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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