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a62d1b02e3
The functions sa_find_sizes() and sa_build_layout() fail to account for the additional 2 bytes of SA header space when calculating whether a variable size attribute might spill over. They may consequently determine that an attribute will fit in the bonus buffer along with a spill block pointer, when in reality the attribute would be partially overwritten by the spill block pointer if spill over occurs. This also causes an inconsistency between the SA header size and the number of variable size attributes in the layout, tripping an assertion when debugging is on. The following reproducer demonstrates the problem. ln -s $(perl -e 'print "z" x 20') file setfattr -h -n trusted.foo -v $(perl -e 'print "z" x 200') file Even though sa_find_sizes() computes the index of the attribute where spill-over will occur, sa_build_layouts() discards the result and recomputes it itself. As it turns out, both functions get it wrong. Since this computation is awkward and, as history has shown, easy to screw up, let's just do it in one place. This patch fixes the bug in sa_find_sizes() and updates sa_build_layout() to use the result computed there. Also improve the comments in sa_find_sizes(). Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #3070 |
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