From: GNU Libc Maintainers <debian-glibc@lists.debian.org>
Date: Fri, 3 Jan 2025 10:56:38 +0000 (+0100)
Subject: local-intr-msg-clobber
X-Git-Tag: archive/raspbian/2.40-5+rpi1^2~60
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=207416afae9dcf9798369b358aa3e9db534a973b;p=glibc.git

local-intr-msg-clobber

Force putting save_data on the stack rather than in SSE register

The signal management does not yet properly save SSE state, so that save_data
would get overwritten by signal handlers, notably leading to `` shell
replacement getting empty content because then the io_read RPC retry gets an
MIG_BAD_ARGUMENTS error.

XXX: This is only temporary to fix the common shll replacement issue, and is
waiting for proper SSE state restoration.


Gbp-Pq: Topic hurd-i386
Gbp-Pq: Name local-intr-msg-clobber.diff
---

diff --git a/hurd/intr-msg.c b/hurd/intr-msg.c
index 424c1fc70..7afd53fa9 100644
--- a/hurd/intr-msg.c
+++ b/hurd/intr-msg.c
@@ -67,7 +67,7 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
   mach_msg_bits_t msgh_bits;
   mach_port_t remote_port;
   mach_msg_id_t msgid;
-  struct clobber save_data;
+  volatile struct clobber save_data;
 
   if ((option & (MACH_SEND_MSG|MACH_RCV_MSG)) != (MACH_SEND_MSG|MACH_RCV_MSG)
       || _hurd_msgport_thread == MACH_PORT_NULL)