Fixed heap OOB read in ld_preload_fuzz.so:select() #26
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Some applications (e.g. OpenSSH) may not allocate a full fd_set, but rather just enough to fit nfds bits.
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Some applications (e.g. OpenSSH) may not allocate a full fd_set, but rather just enough to fit nfds bits.
This behavior is observed in the OpenSSH version included with ProFuzzBench:
https://github.com/vegard/openssh-portable/blob/58b8cfa2a062b72139d7229ae8de567f55776f24/sshd.c#L1125
It is thus only safe to copy as many
fd_maskchunks from the input as guaranteed by the givennfdsargument.