[glibc/release/2.39/master] AArch64: Avoid memset ifunc in cpu-features.c [BZ #33112]

[Wilco Dijkstra]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6ea8902a72fb746ae5cd71ddf1172c5ead89972

commit b6ea8902a72fb746ae5cd71ddf1172c5ead89972
Author: Wilco Dijkstra <wilco.dijkstra@arm.com>
Date:   Fri Jun 27 14:10:55 2025 +0000

    AArch64: Avoid memset ifunc in cpu-features.c [BZ #33112]
    
    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.
    
    Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
    (cherry picked from commit 681a24ae4d0cb8ed92de98b4da660308840b09ba)

Diff:
---
 sysdeps/unix/sysv/linux/aarch64/cpu-features.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index c0b047bc0d..0ad55a0c7f 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)