From: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Tue, 1 Jun 2021 08:23:40 +0000 (+0100)
Subject: aarch64: align stack in clone [BZ #27939]
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d251ad533e4eeaef6e5064b0212f36a3853f18bf;p=thirdparty%2Fglibc.git

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.

(cherry picked from commit 3842ba494963b1d76ad5f68b8d1e5c2279160e31)
---

diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index c9e63bae485..fe04bce6b67 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.  */