fkie_cve-2022-49552
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-02-26 07:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix combination of jit blinding and pointers to bpf subprogs. The combination of jit blinding and pointers to bpf subprogs causes: [ 36.989548] BUG: unable to handle page fault for address: 0000000100000001 [ 36.990342] #PF: supervisor instruction fetch in kernel mode [ 36.990968] #PF: error_code(0x0010) - not-present page [ 36.994859] RIP: 0010:0x100000001 [ 36.995209] Code: Unable to access opcode bytes at RIP 0xffffffd7. [ 37.004091] Call Trace: [ 37.004351] <TASK> [ 37.004576] ? bpf_loop+0x4d/0x70 [ 37.004932] ? bpf_prog_3899083f75e4c5de_F+0xe3/0x13b The jit blinding logic didn't recognize that ld_imm64 with an address of bpf subprogram is a special instruction and proceeded to randomize it. By itself it wouldn't have been an issue, but jit_subprogs() logic relies on two step process to JIT all subprogs and then JIT them again when addresses of all subprogs are known. Blinding process in the first JIT phase caused second JIT to miss adjustment of special ld_imm64. Fix this issue by ignoring special ld_imm64 instructions that don't have user controlled constants and shouldn't be blinded.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b6313cf99b0d51b49aeaea98ec76ca8161ecb80
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a029b02b47dd5bb87a21550d9d9a80cb4dd3f714
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d106a3e96fca30e44081eae9c27aab28fc132a46
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix combination of jit blinding and pointers to bpf subprogs.\n\nThe combination of jit blinding and pointers to bpf subprogs causes:\n[   36.989548] BUG: unable to handle page fault for address: 0000000100000001\n[   36.990342] #PF: supervisor instruction fetch in kernel mode\n[   36.990968] #PF: error_code(0x0010) - not-present page\n[   36.994859] RIP: 0010:0x100000001\n[   36.995209] Code: Unable to access opcode bytes at RIP 0xffffffd7.\n[   37.004091] Call Trace:\n[   37.004351]  \u003cTASK\u003e\n[   37.004576]  ? bpf_loop+0x4d/0x70\n[   37.004932]  ? bpf_prog_3899083f75e4c5de_F+0xe3/0x13b\n\nThe jit blinding logic didn\u0027t recognize that ld_imm64 with an address\nof bpf subprogram is a special instruction and proceeded to randomize it.\nBy itself it wouldn\u0027t have been an issue, but jit_subprogs() logic\nrelies on two step process to JIT all subprogs and then JIT them\nagain when addresses of all subprogs are known.\nBlinding process in the first JIT phase caused second JIT to miss\nadjustment of special ld_imm64.\n\nFix this issue by ignoring special ld_imm64 instructions that don\u0027t have\nuser controlled constants and shouldn\u0027t be blinded."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se corrige la combinaci\u00f3n de cegamiento jit y punteros a subprogramas bpf. La combinaci\u00f3n de cegamiento jit y punteros a subprogramas bpf provoca: [ 36.989548] BUG: unable to handle page fault for address: 0000000100000001 [ 36.990342] #PF: supervisor instruction fetch in kernel mode [ 36.990968] #PF: error_code(0x0010) - not-present page [ 36.994859] RIP: 0010:0x100000001 [ 36.995209] Code: Unable to access opcode bytes at RIP 0xffffffd7. [ 37.004091] Call Trace: [ 37.004351]  [ 37.004576] ? bpf_loop+0x4d/0x70 [ 37.004932] ? bpf_prog_3899083f75e4c5de_F+0xe3/0x13b La l\u00f3gica de cegamiento de jit no reconoci\u00f3 que ld_imm64 con una direcci\u00f3n de subprograma bpf es una instrucci\u00f3n especial y procedi\u00f3 a aleatorizarla. Por s\u00ed sola no habr\u00eda sido un problema, pero la l\u00f3gica jit_subprogs() se basa en un proceso de dos pasos para realizar el JIT de todos los subprogramas y luego realizar el JIT nuevamente cuando se conocen las direcciones de todos los subprogramas. El proceso de cegamiento en la primera fase de JIT provoc\u00f3 que el segundo JIT no ajustara el ld_imm64 especial. Solucione este problema ignorando las instrucciones especiales ld_imm64 que no tienen constantes controladas por el usuario y que no deber\u00edan estar ocultas."
    }
  ],
  "id": "CVE-2022-49552",
  "lastModified": "2025-02-26T07:01:31.040",
  "metrics": {},
  "published": "2025-02-26T07:01:31.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4b6313cf99b0d51b49aeaea98ec76ca8161ecb80"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a029b02b47dd5bb87a21550d9d9a80cb4dd3f714"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d106a3e96fca30e44081eae9c27aab28fc132a46"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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