path: root/include
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authorRich Felker <>2013-06-27 12:48:59 -0400
committerRich Felker <>2013-06-27 12:48:59 -0400
commit3cd6f5229f079f892411e82fce3fe15c78eef4d8 (patch)
treefd513b5adab33019ed5251ffea1076eec6140afc /include
parentb17c75a4d539d7ec5b81cc7ce7ce6b065a87e7a6 (diff)
disallow creation of objects larger than PTRDIFF_MAX via mmap
internally, other parts of the library assume sizes don't overflow ssize_t and/or ptrdiff_t, and the way this assumption is made valid is by preventing creating of such large objects. malloc already does so, but the check was missing from mmap. this is also a quality of implementation issue: even if the implementation internally could handle such objects, applications could inadvertently invoke undefined behavior by subtracting pointers within an object. it is very difficult to guard against this in applications, so a good implementation should simply ensure that it does not happen.
Diffstat (limited to 'include')
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