CVE-2022-48629 (GCVE-0-2022-48629)

Vulnerability from cvelistv5 – Published: 2024-03-05 11:18 – Updated: 2025-05-04 08:20
VLAI?
Title
crypto: qcom-rng - ensure buffer for generate is completely filled
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: qcom-rng - ensure buffer for generate is completely filled The generate function in struct rng_alg expects that the destination buffer is completely filled if the function returns 0. qcom_rng_read() can run into a situation where the buffer is partially filled with randomness and the remaining part of the buffer is zeroed since qcom_rng_generate() doesn't check the return value. This issue can be reproduced by running the following from libkcapi: kcapi-rng -b 9000000 > OUTFILE The generated OUTFILE will have three huge sections that contain all zeros, and this is caused by the code where the test 'val & PRNG_STATUS_DATA_AVAIL' fails. Let's fix this issue by ensuring that qcom_rng_read() always returns with a full buffer if the function returns success. Let's also have qcom_rng_generate() return the correct value. Here's some statistics from the ent project (https://www.fourmilab.ch/random/) that shows information about the quality of the generated numbers: $ ent -c qcom-random-before Value Char Occurrences Fraction 0 606748 0.067416 1 33104 0.003678 2 33001 0.003667 ... 253 � 32883 0.003654 254 � 33035 0.003671 255 � 33239 0.003693 Total: 9000000 1.000000 Entropy = 7.811590 bits per byte. Optimum compression would reduce the size of this 9000000 byte file by 2 percent. Chi square distribution for 9000000 samples is 9329962.81, and randomly would exceed this value less than 0.01 percent of the times. Arithmetic mean value of data bytes is 119.3731 (127.5 = random). Monte Carlo value for Pi is 3.197293333 (error 1.77 percent). Serial correlation coefficient is 0.159130 (totally uncorrelated = 0.0). Without this patch, the results of the chi-square test is 0.01%, and the numbers are certainly not random according to ent's project page. The results improve with this patch: $ ent -c qcom-random-after Value Char Occurrences Fraction 0 35432 0.003937 1 35127 0.003903 2 35424 0.003936 ... 253 � 35201 0.003911 254 � 34835 0.003871 255 � 35368 0.003930 Total: 9000000 1.000000 Entropy = 7.999979 bits per byte. Optimum compression would reduce the size of this 9000000 byte file by 0 percent. Chi square distribution for 9000000 samples is 258.77, and randomly would exceed this value 42.24 percent of the times. Arithmetic mean value of data bytes is 127.5006 (127.5 = random). Monte Carlo value for Pi is 3.141277333 (error 0.01 percent). Serial correlation coefficient is 0.000468 (totally uncorrelated = 0.0). This change was tested on a Nexus 5 phone (msm8974 SoC).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ceec5f5b59882b871a722ca4d49b767a09a4bde9 , < a8e32bbb96c25b7ab29b1894dcd45e0b3b08fd9d (git)
Affected: ceec5f5b59882b871a722ca4d49b767a09a4bde9 , < 184f7bd08ce56f003530fc19f160d54e75bf5c9d (git)
Affected: ceec5f5b59882b871a722ca4d49b767a09a4bde9 , < 0f9b7b8df17525e464294c916acc8194ce38446b (git)
Affected: ceec5f5b59882b871a722ca4d49b767a09a4bde9 , < ab9337c7cb6f875b6286440b1adfbeeef2b2b2bd (git)
Affected: ceec5f5b59882b871a722ca4d49b767a09a4bde9 , < 485995cbc98a4f77cfd4f8ed4dd7ff8ab262964d (git)
Affected: ceec5f5b59882b871a722ca4d49b767a09a4bde9 , < a680b1832ced3b5fa7c93484248fd221ea0d614b (git)
Create a notification for this product.
    Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 4.19.236 , ≤ 4.19.* (semver)
Unaffected: 5.4.187 , ≤ 5.4.* (semver)
Unaffected: 5.10.108 , ≤ 5.10.* (semver)
Unaffected: 5.15.31 , ≤ 5.15.* (semver)
Unaffected: 5.16.17 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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ensure buffer for generate is completely filled\\n\\nThe generate function in struct rng_alg expects that the destination\\nbuffer is completely filled if the function returns 0. qcom_rng_read()\\ncan run into a situation where the buffer is partially filled with\\nrandomness and the remaining part of the buffer is zeroed since\\nqcom_rng_generate() doesn\u0027t check the return value. This issue can\\nbe reproduced by running the following from libkcapi:\\n\\n    kcapi-rng -b 9000000 \u003e OUTFILE\\n\\nThe generated OUTFILE will have three huge sections that contain all\\nzeros, and this is caused by the code where the test\\n\u0027val \u0026 PRNG_STATUS_DATA_AVAIL\u0027 fails.\\n\\nLet\u0027s fix this issue by ensuring that qcom_rng_read() always returns\\nwith a full buffer if the function returns success. Let\u0027s also have\\nqcom_rng_generate() return the correct value.\\n\\nHere\u0027s some statistics from the ent project\\n(https://www.fourmilab.ch/random/) that shows information about the\\nquality of the generated numbers:\\n\\n    $ ent -c qcom-random-before\\n    Value Char Occurrences Fraction\\n      0           606748   0.067416\\n      1            33104   0.003678\\n      2            33001   0.003667\\n    ...\\n    253   \\ufffd        32883   0.003654\\n    254   \\ufffd        33035   0.003671\\n    255   \\ufffd        33239   0.003693\\n\\n    Total:       9000000   1.000000\\n\\n    Entropy = 7.811590 bits per byte.\\n\\n    Optimum compression would reduce the size\\n    of this 9000000 byte file by 2 percent.\\n\\n    Chi square distribution for 9000000 samples is 9329962.81, and\\n    randomly would exceed this value less than 0.01 percent of the\\n    times.\\n\\n    Arithmetic mean value of data bytes is 119.3731 (127.5 = random).\\n    Monte Carlo value for Pi is 3.197293333 (error 1.77 percent).\\n    Serial correlation coefficient is 0.159130 (totally uncorrelated =\\n    0.0).\\n\\nWithout this patch, the results of the chi-square test is 0.01%, and\\nthe numbers are certainly not random according to ent\u0027s project page.\\nThe results improve with this patch:\\n\\n    $ ent -c qcom-random-after\\n    Value Char Occurrences Fraction\\n      0            35432   0.003937\\n      1            35127   0.003903\\n      2            35424   0.003936\\n    ...\\n    253   \\ufffd        35201   0.003911\\n    254   \\ufffd        34835   0.003871\\n    255   \\ufffd        35368   0.003930\\n\\n    Total:       9000000   1.000000\\n\\n    Entropy = 7.999979 bits per byte.\\n\\n    Optimum compression would reduce the size\\n    of this 9000000 byte file by 0 percent.\\n\\n    Chi square distribution for 9000000 samples is 258.77, and randomly\\n    would exceed this value 42.24 percent of the times.\\n\\n    Arithmetic mean value of data bytes is 127.5006 (127.5 = random).\\n    Monte Carlo value for Pi is 3.141277333 (error 0.01 percent).\\n    Serial correlation coefficient is 0.000468 (totally uncorrelated =\\n    0.0).\\n\\nThis change was tested on a Nexus 5 phone (msm8974 SoC).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.236\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.187\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.108\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.31\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.17\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17\", \"versionStartIncluding\": \"4.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:20:04.717Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48629\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:20:04.717Z\", \"dateReserved\": \"2024-02-25T13:44:28.315Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-05T11:18:06.562Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Detection rules are retrieved from Rulezet.