[Buildroot] [git commit branch/2021.02.x] package/flex: ignore CVE-2019-6293

[Buildroot] [git commit branch/2021.02.x] package/flex: ignore CVE-2019-6293

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=9d8f5a47129d02ed5408da78f52a24557784e596
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.02.x

https://security-tracker.debian.org/tracker/CVE-2019-6293

https://github.com/NixOS/nixpkgs/issues/55386#issuecomment-683792976
 "But this bug does not cause stack overflows in the generated code.
 The function and file referred to in the bug (mark_beginning_as_normal
 in nfa.c) are part of the flex code generator, not part of the
 generated code. If flex crashes before generating any code, that
 can hardly be a vulnerability. If flex does not crash, the generated
 code is fine (or perhaps subject to other unreported bugs, who knows,
 but the NFA has been generated correctly)."

Upstream has chosen to not provide a fix
 https://github.com/westes/flex/issues/414

Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
[yann.morin.1998 at free.fr: use actual upstream URL]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 120d1241d8301089ed05f865f03b4915c843e936)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/flex/flex.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/package/flex/flex.mk b/package/flex/flex.mk
index 2d00969662..85da5ddae8 100644
--- a/package/flex/flex.mk
+++ b/package/flex/flex.mk
@@ -10,6 +10,9 @@ FLEX_INSTALL_STAGING = YES
 FLEX_LICENSE = FLEX
 FLEX_LICENSE_FILES = COPYING
 FLEX_CPE_ID_VENDOR = flex_project
+# bug does not cause stack overflows in the generated code and has been
+# noted upstream as a bug in the code generator
+FLEX_IGNORE_CVES = CVE-2019-6293
 FLEX_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES) host-m4
 HOST_FLEX_DEPENDENCIES = host-m4