Fix alert-exceeds-max feature for files > 2GB and < max-filesize (1.0.4)#1041
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val-ms merged 1 commit intoCisco-Talos:dev/1.0.4from Oct 19, 2023
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The --alert-exceeds-max feature should alert for all files larger than 2GB because 2GB is the internal limit for individual files. This isn't working correctly because the `goto done;` exit condition after recording the exceeds-max heuristic skips over the logic that reports the alert. This fix moves the ">2GB" check up to the location where the max-filesize engine option is set by clamd or clamscan. If max-filesize > 2GB - 1 is requested, then max-filesize is set to 2GB - 1. Additionally, a warning is printed if max-filesize > 2GB is requested (with an exception for when it's maxed out by setting --max-filesize=0). Resolves: Cisco-Talos#1030
val-ms
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Why is there a limit of 2 Gb ? How can we get ClamAV to scan files bigger than 2 GB up to 4GB ? |
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@Raj-2024 The ClamAV source code has a lot of older modules that were not designed with large files in mind. It would require a careful audit to identify and upgrade all areas in ClamAV to safely handle files larger than 2GB. The ticket requesting this change to support files larger than 2GB is here: #344 |
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Backport of #1032
The --alert-exceeds-max feature should alert for all files larger than 2GB because 2GB is the internal limit for individual files. This isn't working correctly because the
goto done;exit condition after recording the exceeds-max heuristic skips over the logic that reports the alert.This fix moves the ">2GB" check up to the location where the max-filesize engine option is set by clamd or clamscan. If max-filesize > 2GB - 1 is requested, then max-filesize is set to 2GB - 1.
Additionally, a warning is printed if max-filesize > 2GB is requested (with an exception for when it's maxed out by setting --max-filesize=0).
Resolves: #1030