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explain/vondehi.md
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2 | -## vondehi |
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3 | - |
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4 | -Vondehi is an in-memory unpacker for data compressed with `gzip` or `xz` (or |
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5 | -`xz` in LZMA1-mode). It basically performs these steps: |
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6 | - |
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7 | -1. Set up a memfd using the `memfd_create` syscall. This file descriptor works |
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8 | - like a regular file, except the backing storage is RAM. |
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9 | -2. Fork, pipe the payload data to `zcat` or `xzcat`, which outputs everything |
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10 | - to the memfd from step 1. |
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11 | -3. Run `execveat` on the memfd. |
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12 | - |
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13 | -Of course, the code itself is hand-optimized x86 assembly, and is very crazy. |
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14 | - |
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