6aa7ebcf49
make exec() clear the per process error string to avoid spurious errors and confusion. the errstr() syscall used to always swap the maximum buffer size with memmove(), which is problematic as this gives access to the garbage beyond the NUL byte. worse, newproc(), werrstr() and rerrstr() only clear the first byte of the input buffer. so random stack rubble could be leaked across processes. we change the errstr() syscall to not copy beyond the NUL byte. the manpage also documents that errstr() should truncate on a utf8 boundary so we use utfecpy() to ensure proper NUL termination. |
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