public inbox for glibc-cvs@sourceware.org
help / color / mirror / Atom feed
* [glibc] aarch64: align stack in clone [BZ #27939]
@ 2021-06-01 9:45 Szabolcs Nagy
0 siblings, 0 replies; only message in thread
From: Szabolcs Nagy @ 2021-06-01 9:45 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3842ba494963b1d76ad5f68b8d1e5c2279160e31
commit 3842ba494963b1d76ad5f68b8d1e5c2279160e31
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Tue Jun 1 09:23:40 2021 +0100
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.
Diff:
---
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. */
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-06-01 9:45 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-01 9:45 [glibc] aarch64: align stack in clone [BZ #27939] Szabolcs Nagy
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).