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https://github.com/wolfcw/libfaketime.git
synced 2026-05-17 00:26:16 +03:00
00d6edf90c
A single program that invokes getrandom() repeatedly should end up with the same stream of bytes, regardless of how it chunks up the reading from the entropy source. This test already passses. I'm including it because it seems like a useful confirmation.
57 lines
1.8 KiB
Bash
Executable File
57 lines
1.8 KiB
Bash
Executable File
#!/bin/sh
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FTPL="${FAKETIME_TESTLIB:-../src/libfaketime.so.1}"
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set -e
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error=0
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./getrandom_test > run-base
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LD_PRELOAD="$FTPL" ./getrandom_test > run0
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FAKERANDOM_SEED=0x12345678DEADBEEF LD_PRELOAD="$FTPL" ./getrandom_test > run1
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FAKERANDOM_SEED=0x12345678DEADBEEF LD_PRELOAD="$FTPL" ./getrandom_test > run2
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FAKERANDOM_SEED=0x0000000000000000 LD_PRELOAD="$FTPL" ./getrandom_test > run3
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if diff -u run-base run0 > /dev/null; then
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error=1
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printf >&2 'test run without the LD_PRELOAD matches a run without LD_PRELOAD\n'
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fi
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if diff -u run0 run1 > /dev/null; then
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error=2
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printf >&2 'test run without a seed produced the same data as a run with a seed!\n'
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fi
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if ! diff -u run1 run2; then
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error=3
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printf >&2 'test runs with identical seeds differed!\n'
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fi
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if diff -u run2 run3 >/dev/null; then
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error=4
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printf >&2 'test runs with different seeds produced the same data!\n'
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fi
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printf 'testing shared object with getrandom() in library constructor\n'
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LD_LIBRARY_PATH=. ./use_lib_random
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printf 'now with LD_PRELOAD and FAKERANDOM_SEED\n'
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FAKERANDOM_SEED=0x0000000000000000 LD_PRELOAD="$FTPL" LD_LIBRARY_PATH=. ./use_lib_random
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# this demonstrates the crasher from https://github.com/wolfcw/libfaketime/issues/295
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printf 'now with LD_PRELOAD without FAKERANDOM_SEED\n'
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LD_PRELOAD="$FTPL" LD_LIBRARY_PATH=. ./use_lib_random
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FAKERANDOM_SEED=0xDEADBEEFDEADBEEF LD_PRELOAD="$FTPL" ./repeat_random 3 5 > run4
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FAKERANDOM_SEED=0xDEADBEEFDEADBEEF LD_PRELOAD="$FTPL" ./repeat_random 5 3 > run5
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if ! diff -u run4 run5; then
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error=5
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printf >&2 '5 calls of getrandom(3) did not produce the same stream as 3 calls of getrandom(5)\n'
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fi
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rm -f run-base run0 run1 run2 run3 run4 run5
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if [ 0 = $error ]; then
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printf 'getrandom interception test successful.\n'
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fi
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exit $error
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