Messages in this thread | | | Date | Tue, 11 Feb 2020 11:35:50 -0800 | From | Kees Cook <> | Subject | Re: [PATCH] treewide: Replace zero-length arrays with flexible-array member |
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On Tue, Feb 11, 2020 at 11:41:26AM -0600, Gustavo A. R. Silva wrote: > The current codebase makes use of the zero-length array language > extension to the C90 standard, but the preferred mechanism to declare > variable-length types such as these ones is a flexible array member[1][2], > introduced in C99: > > struct foo { > int stuff; > struct boo array[]; > }; > > By making use of the mechanism above, we will get a compiler warning > in case the flexible array does not occur last in the structure, which > will help us prevent some kind of undefined behavior bugs from being > unadvertenly introduced[3] to the codebase from now on.
Is there a compiler warning we can enable to avoid new 0-byte arrays from entering the kernel source tree? I can only find "-pedantic" which enables way too many other checks.
-- Kees Cook
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