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CVS commit: src/sys/miscfs/umapfs

Module Name:    src
Committed By:   maxv
Date:           Mon Aug 11 14:02:14 UTC 2014

Modified Files:
        src/sys/miscfs/umapfs: umap_vfsops.c

Log Message:
1) 'error' is returned while it does not even hold an error code. Which
   means that zero is returned, and the kernel keeps mounting (and it
   probably ends up in a deadlock/memory corruption somewhere).
2) 'nentries' and 'gnentries' are int and user-controlled, and there's no
   check to ensure they are greater than zero. Since they are used to
   compute the size of two copyin's, a user can control the copied size
   by giving a negative value (like 128-2^29), and thus overwrite kernel

Both triggerable from root only.

To generate a diff of this commit:
cvs rdiff -u -r1.93 -r1.94 src/sys/miscfs/umapfs/umap_vfsops.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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