From 3842ba494963b1d76ad5f68b8d1e5c2279160e31 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Tue, 1 Jun 2021 09:23:40 +0100
Subject: [PATCH] aarch64: align stack in clone [BZ #27939]

The AArch64 PCS requires 16 byte aligned stack.  Previously if the
caller passed an unaligned stack to clone then the child crashed.

Fixes bug 27939.

Conflict:NA
Reference:https://sourceware.org/git/?p=glibc.git;a=commit;h=3842ba494963b1d76ad5f68b8d1e5c2279160e31
---
 sysdeps/unix/sysv/linux/aarch64/clone.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index c9e63bae48..fe04bce6b6 100644
--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
@@ -47,6 +47,8 @@ ENTRY(__clone)
 	/* Sanity check args.  */
 	mov	x0, #-EINVAL
 	cbz	x10, .Lsyscall_error
+	/* Align sp.  */
+	and	x1, x1, -16
 	cbz	x1, .Lsyscall_error
 
 	/* Do the system call.  */
-- 
2.27.0

