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aarch64: align stack in clone [BZ #27939]
authorSzabolcs Nagy <szabolcs.nagy@arm.com>
Tue, 1 Jun 2021 08:23:40 +0000 (09:23 +0100)
committerAurelien Jarno <aurelien@aurel32.net>
Wed, 26 Jan 2022 21:51:14 +0000 (22:51 +0100)
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 patch | blob | blame | history

diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index c9e63bae48507896a9639f2fe3eb6f954b0a033f..fe04bce6b6747742ec03bd74d2771671f8dfe8ff 100644 (file)
--- 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.  */
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