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Fix bug in libunwind-ptrace which can cause reading of random data.

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(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.
This commit is contained in:
David Mosberger-Tang 2006-07-25 21:35:30 -06:00
parent cbd8648b33
commit af2503e223
1 changed files with 9 additions and 0 deletions
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9
src/os-linux.h
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@ -233,6 +233,15 @@ maps_next (struct map_iterator *mi,
mi->buf_size - bytes_left); mi->buf_size - bytes_left);
if (nread <= 0) if (nread <= 0)
return 0; return 0;
else if (nread + bytes_left < mi->buf_size)
{
/* Move contents to the end of the buffer so we
maintain the invariant that all bytes between
mi->buf and mi->buf_end are valid. */
memcpy (mi->buf_end - nread - bytes_left, mi->buf,
nread + bytes_left);
mi->buf = mi->buf_end - nread - bytes_left;
}
eol = mi->buf + bytes_left + nread - 1; eol = mi->buf + bytes_left + nread - 1;