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The `mmap` size is `max_destlen`, but `munmap` size is `destlen`, which
causes a memory leak.
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When we decompress images for mutation or hints,
we always specially check for empty compressed data
(I assume it can apper after minimization).
Treat it as correct compressed and return empty decompressed data.
This removes the need in special handling in users.
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Benchmark results:
name old time/op new time/op delta
Decompress-8 24.7ms ± 1% 13.4ms ± 4% -45.81% (p=0.000 n=16+19)
name old alloc/op new alloc/op delta
Decompress-8 67.2MB ± 0% 0.0MB ± 1% -99.98% (p=0.000 n=18+20)
name old allocs/op new allocs/op delta
Decompress-8 188 ± 0% 167 ± 0% -11.17% (p=0.000 n=20+20)
Test process memory consumption drops from 220MB to 80MB.
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The images we unpack has huge ranges of 0s.
Currently we write all bytes and as the result page in whole unpacked image.
Don't write 0s since we just mmaped zero memory.
This reduces btrfs_0 seed memory consumption from 130MB to 6MB.
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We don't use C89 style.
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This will allow us to mutate the image size.
Fixes #3527
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zlib can calculate uncompressed output size if given NULL destination buffer.
We don't use that. Remove.
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In executor code we commonly use the syscall interface for functions:
return -1 on erorr and set errno.
Use this interface for puff_zlib_to_file.
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Create a header file to provide a clean entrypoint `puff_zlib_to_file()`,
which decompresses `zlib` data from an array to a file. This will be
used for pseudo-syscalls which accept compressed data, e.g.
`syz_mount_image`. The implementation uses a slightly-modified version
of `puff.{c,h}`, found in the `zlib` repository.
We have to be careful to ensure the copyright information from
`puff.{c,h}` gets included in generated C code and C reproducers.
Therefore, introduce the `//%` pattern to indicate comments which should
not be removed by code generation, and use this pattern for the
copyright notice.
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