From e1870dec813fa6f8482f4f27b7a9bef8c1584b6b Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Tue, 14 Feb 2023 14:48:37 +0100
Subject: [PATCH 3/3] target/s390x/arch_dump: Fix memory corruption in
 s390x_write_elf64_notes()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

RH-Author: Thomas Huth <thuth@redhat.com>
RH-MergeRequest: 260: target/s390x/arch_dump: Fix memory corruption in s390x_write_elf64_notes()
RH-Bugzilla: 2168187
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Acked-by: Cédric Le Goater <clg@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Commit: [1/1] 67b71ed720a1f03d5bda9119969ea95fc4a6106d

Bugzilla: https://bugzilla.redhat.com/2168187
Upstream-Status: Posted (and reviewed, but not merged yet)

"note_size" can be smaller than sizeof(note), so unconditionally calling
memset(notep, 0, sizeof(note)) could cause a memory corruption here in
case notep has been allocated dynamically, thus let's use note_size as
length argument for memset() instead.

Fixes: 113d8f4e95 ("s390x: pv: Add dump support")
Message-Id: <20230214141056.680969-1-thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 target/s390x/arch_dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/s390x/arch_dump.c b/target/s390x/arch_dump.c
index a2329141e8..a7c44ba49d 100644
--- a/target/s390x/arch_dump.c
+++ b/target/s390x/arch_dump.c
@@ -248,7 +248,7 @@ static int s390x_write_elf64_notes(const char *note_name,
             notep = g_malloc(note_size);
         }
 
-        memset(notep, 0, sizeof(note));
+        memset(notep, 0, note_size);
 
         /* Setup note header data */
         notep->hdr.n_descsz = cpu_to_be32(content_size);
-- 
2.37.3