[glibc] sysdeps/{i386, x86_64}/mempcpy_chk.S: fix linknamespace for __mempcpy_chk

[Siddhesh Poyarekar <siddhesh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1bc85effd549ae42318b37555a4c76ebc479b92a

commit 1bc85effd549ae42318b37555a4c76ebc479b92a
Author: Frederic Berat <fberat@redhat.com>
Date:   Tue Jun 20 20:18:52 2023 +0200

    sysdeps/{i386, x86_64}/mempcpy_chk.S: fix linknamespace for __mempcpy_chk
    
    On i386 and x86_64, for libc.a specifically, __mempcpy_chk calls
    mempcpy which leads POSIX routines to call non-POSIX mempcpy indirectly.
    
    This leads the linknamespace test to fail when glibc is built with
    __FORTIFY_SOURCE=3.
    
    Since calling mempcpy doesn't bring any benefit for libc.a, directly
    call __mempcpy instead.
    
    Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

Diff:
---
 sysdeps/i386/mempcpy_chk.S   | 2 +-
 sysdeps/x86_64/mempcpy_chk.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/i386/mempcpy_chk.S b/sysdeps/i386/mempcpy_chk.S
index 8b785bd9a5..1e9bf71bfb 100644
--- a/sysdeps/i386/mempcpy_chk.S
+++ b/sysdeps/i386/mempcpy_chk.S
@@ -28,6 +28,6 @@ ENTRY (__mempcpy_chk)
 	movl	12(%esp), %eax
 	cmpl	%eax, 16(%esp)
 	jb	__chk_fail
-	jmp	mempcpy
+	jmp	__mempcpy
 END (__mempcpy_chk)
 #endif
diff --git a/sysdeps/x86_64/mempcpy_chk.S b/sysdeps/x86_64/mempcpy_chk.S
index b1ddb02f78..b60ee4ff08 100644
--- a/sysdeps/x86_64/mempcpy_chk.S
+++ b/sysdeps/x86_64/mempcpy_chk.S
@@ -28,6 +28,6 @@
 ENTRY (__mempcpy_chk)
 	cmpq	%rdx, %rcx
 	jb	__chk_fail
-	jmp	mempcpy
+	jmp	__mempcpy
 END (__mempcpy_chk)
 #endif