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SubjectRe: [PATCH] treewide: Replace zero-length arrays with flexible-array member
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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