[PATCH 3/3] meson: Enable -Wvla

[Thomas Huth <thuth@redhat.com>]

From: Peter Maydell <peter.maydell@linaro.org>

QEMU has historically used variable length arrays only very rarely.
Variable length arrays are a potential security issue where an
on-stack dynamic allocation isn't correctly size-checked, especially
when the size comes from the guest.  (An example problem of this kind
from the past is CVE-2021-3527).  Forbidding them entirely is a
defensive measure against further bugs of this kind.

Enable -Wvla to prevent any new uses from sneaking into the codebase.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20240125173211.1786196-3-peter.maydell@linaro.org>
[thuth: rebased to current master branch]
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 meson.build | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meson.build b/meson.build
index c1dc83e4c0..0ef1654e86 100644
--- a/meson.build
+++ b/meson.build
@@ -592,6 +592,7 @@ warn_flags = [
   '-Wstrict-prototypes',
   '-Wtype-limits',
   '-Wundef',
+  '-Wvla',
   '-Wwrite-strings',
 
   # Then disable some undesirable warnings
-- 
2.43.2