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From: Aurelien Jarno <>
Cc: Szabolcs Nagy <>
Subject: [COMMITTED 2.33] aarch64: align stack in clone [BZ #27939]
Date: Wed, 26 Jan 2022 22:54:02 +0100	[thread overview]
Message-ID: <> (raw)

From: Szabolcs Nagy <>

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)
 sysdeps/unix/sysv/linux/aarch64/clone.S | 2 ++
 1 file changed, 2 insertions(+)

This fixes a failure in the recently backported commit CVE-2021-3999

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.  */

                 reply	other threads:[~2022-01-26 21:54 UTC|newest]

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