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| author | Nick Mathewson <nickm@torproject.org> | 2017-11-11 14:42:39 -0500 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2017-11-11 14:44:45 -0500 |
| commit | a7ca71cf6b2fb46b049442569188ce046cfd6c34 (patch) | |
| tree | 371524ee86ff1266006f49255c98896e6b778bd0 /src/test/fuzz/fuzzing_common.c | |
| parent | 512dfa15edf9723cb5bfa2b86d5658e320496445 (diff) | |
| download | tor-a7ca71cf6b2fb46b049442569188ce046cfd6c34.tar.gz tor-a7ca71cf6b2fb46b049442569188ce046cfd6c34.zip | |
Fix mock_crypto_pk_public_checksig__nocheck() to handle short RSA keys
This function -- a mock replacement used only for fuzzing -- would
have a buffer overflow if it got an RSA key whose modulus was under
20 bytes long.
Fortunately, Tor itself does not appear to have a bug here.
Fixes bug 24247; bugfix on 0.3.0.3-alpha when fuzzing was
introduced. Found by OSS-Fuzz; this is OSS-Fuzz issue 4177.
Diffstat (limited to 'src/test/fuzz/fuzzing_common.c')
| -rw-r--r-- | src/test/fuzz/fuzzing_common.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/test/fuzz/fuzzing_common.c b/src/test/fuzz/fuzzing_common.c index 7ebddde1a8..1e98eb6c85 100644 --- a/src/test/fuzz/fuzzing_common.c +++ b/src/test/fuzz/fuzzing_common.c @@ -28,8 +28,9 @@ mock_crypto_pk_public_checksig__nocheck(const crypto_pk_t *env, char *to, (void)fromlen; /* We could look at from[0..fromlen-1] ... */ tor_assert(tolen >= crypto_pk_keysize(env)); - memset(to, 0x01, 20); - return 20; + size_t siglen = MIN(20, crypto_pk_keysize(env)); + memset(to, 0x01, siglen); + return (int)siglen; } static int |