Bug 746749

Summary:	>=sys-devel/gcc-9: memcmp stripped wrongly
Product:	Gentoo Linux	Reporter:	Luke-Jr <luke-jr+gentoobugs>
Component:	Current packages	Assignee:	Gentoo Toolchain Maintainers <toolchain>
Status:	RESOLVED FIXED
Severity:	normal	CC:	jaco, sam
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://gcc.gnu.org/PR95189
Whiteboard:	wait for upstream release
Package list:		Runtime testing required:	---

Description Luke-Jr 2020-10-05 18:26:37 UTC

I'm surprised if this isn't a duplicate, but I can't find a bug for it...

GCC 9 and 10 will in some circumstances "optimise" a memcmp to always return zero.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95189

I'm not aware of any security implications or other practical problems, but it has the potential to be quite harmful in theory.

Comment 1 Jaco Kroon 2020-12-22 18:32:07 UTC

sox package affected too.

Comment 2 Sergei Trofimovich (RETIRED) gentoo-dev

2021-04-29 07:01:32 UTC

Should be fixed in gcc-11.1 and gcc-10.3