* [COMMITTED 2.33] aarch64: align stack in clone [BZ #27939]
@ 2022-01-26 21:54 Aurelien Jarno
0 siblings, 0 replies; only message in thread
From: Aurelien Jarno @ 2022-01-26 21:54 UTC (permalink / raw)
To: libc-stable; +Cc: Szabolcs Nagy
From: Szabolcs Nagy <szabolcs.nagy@arm.com>
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
fix.
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. */
--
2.34.1
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