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Fix bug in libunwind-ptrace which can cause reading of random data.
(maps_next): After reading less than a full buffer of data, copy remaining data to the top of the buffer so as to maintain the invariant that all data between mi->buf and mi->buf_end is valid. This avoids maps_next() parsing uninitialized data.
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@ -233,6 +233,15 @@ maps_next (struct map_iterator *mi,
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mi->buf_size - bytes_left);
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if (nread <= 0)
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return 0;
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else if (nread + bytes_left < mi->buf_size)
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{
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/* Move contents to the end of the buffer so we
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maintain the invariant that all bytes between
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mi->buf and mi->buf_end are valid. */
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memcpy (mi->buf_end - nread - bytes_left, mi->buf,
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nread + bytes_left);
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mi->buf = mi->buf_end - nread - bytes_left;
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}
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eol = mi->buf + bytes_left + nread - 1;
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