From: Radoslaw Zarzynski <rzarzyns@redhat.com>
Date: Wed, 4 Sep 2024 09:04:47 +0000 (+0000)
Subject: buffer: raw_zeros mprotects the zeros
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=e928779faa4157cb5f93d87f38c0c188c5ba4257;p=ceph.git

buffer: raw_zeros mprotects the zeros

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>
---

diff --git a/src/common/buffer.cc b/src/common/buffer.cc
index ee502e25b204..6a6a8cbe5ba7 100644
--- a/src/common/buffer.cc
+++ b/src/common/buffer.cc
@@ -141,6 +141,19 @@ static ceph::spinlock debug_lock;
     raw_zeros(char *dataptr, unsigned l, int mempool)
       : raw_combined(dataptr, l, mempool) {
       memset(dataptr, 0, l);
+#ifndef _WIN32
+      if (mprotect(dataptr, l, PROT_READ) != 0) {
+        ceph_abort_msg("mprotect on raw_zeros failed");
+      }
+#endif
+    }
+
+    ~raw_zeros() {
+#ifndef _WIN32
+      if (mprotect(data, len, PROT_WRITE | PROT_READ) != 0) {
+        ceph_abort_msg("mprotect on destroing raw_zeros failed");
+      }
+#endif
     }
 
     static constexpr unsigned ZERO_AREA_NUM_PAGES = 4;