[PATCH v2] AArch64: Avoid memset ifunc in cpu-features.c [BZ #33112]

[Wilco Dijkstra]

v2: Use dl-symbol-redir-ifunc.h to avoid ifuncs in startup code

During early startup memcpy or memset must not be called since many targets
use ifuncs for them which won't be initialized yet.  Security hardening may
use -ftrivial-auto-var-init=zero which inserts calls to memset.  Redirect
memset to memset_generic by including dl-symbol-redir-ifunc.h in cpu-features.c.
This fixes BZ #33112.

Tested ldconfig doesn't crash with -ftrivial-auto-var-init=zero. OK for commit?

---

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index 6d63c8a9ecba5608ebd96c6ac2455778f5fbee3c..1acc82d07720541340705141f498cd09b8e51e7c 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -23,6 +23,7 @@
 #include <sys/prctl.h>
 #include <sys/utsname.h>
 #include <dl-tunables-parse.h>
+#include <dl-symbol-redir-ifunc.h>
 
 #define DCZID_DZP_MASK (1 << 4)
 #define DCZID_BS_MASK (0xf)