Fix #73809: Phar Zip parse crash - mmap fail #6474
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Phar signatures practically are of limited size; for the MD5 and SHA hashes the size is fixed (at most 64 bytes for SHA512); for OpenSSL public keys there is no size limit in theory, but "64 KiB ought to be good enough for anybody". So we check for that limit, to avoid fatal errors due to out of memory conditions. Since it is neither possible to have the signature compressed in the ZIP archive, nor is it possible to manually add a signature via Phar, we use ZipArchive to create a suitable archive for the test on the fly.
nikic
approved these changes
Dec 1, 2020
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Phar signatures practically are of limited size; for the MD5 and SHA
hashes the size is fixed (at most 64 bytes for SHA512); for OpenSSL
public keys there is no size limit in theory, but "64 KiB ought to be
good enough for anybody". So we check for that limit, to avoid fatal
errors due to out of memory conditions.
Since it is neither possible to have the signature compressed in the
ZIP archive, nor is it possible to manually add a signature via Phar,
we use ZipArchive to create a suitable archive for the test on the fly.