Date: Fri, 16 Mar 2018 20:12:15 +0000 From: Al Viro <viro@...IV.linux.org.uk> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Florian Weimer <fweimer@...hat.com>, Kees Cook <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Randy Dunlap <rdunlap@...radead.org>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Ingo Molnar <mingo@...nel.org>, David Laight <David.Laight@...lab.com>, Ian Abbott <abbotti@....co.uk>, linux-input <linux-input@...r.kernel.org>, linux-btrfs <linux-btrfs@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH v5 0/2] Remove false-positive VLAs when using max() On Fri, Mar 16, 2018 at 12:27:23PM -0700, Linus Torvalds wrote: > But it sure isn't "variable" either as far as the standard is > concerned, because the standard doesn't even have that concept (it > uses "variable" for argument numbers and for variables). Huh? 126.96.36.199p4: If the size is not present, the array type is an incomplete type. If the size is * instead of being an expression, the array type is a variable length array type of unspecified size, which can only be used in declarations with function prototype scope [footnote]; such arrays are nonetheless complete types. If the size is an integer constant expression and the element type has a known constant size, the array type is not a variable length array type; otherwise, the array type is a variable length array type. footnote: Thus, * can be used only in function declarations that are not definitions (see 188.8.131.52). That's C99, straight from N1256.pdf (C99-TC3)...
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