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From: =?utf-8?b?T25kxZllaiBTdXLDvQ==?= <ondrej@isc.org>
Date: Sat, 27 Jul 2024 04:57:36 +0200
Subject: Disable RTLD_DEEPBIND in Samba DLZ module
When RTLD_DEEPBIND is enabled in the LDB modules inside the Samba DLZ
plugin, and jemalloc is the BIND 9 memory allocator, there's a mismatch
in the used symbols and the LDB allocates memory using BIND 9
allocator (jemalloc), but frees the memory using RLTD_DEEPBIND free()
symbol from libc. This causes assertion failure on BIND 9 startup.
---
bin/named/dlz_dlopen_driver.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/bin/named/dlz_dlopen_driver.c b/bin/named/dlz_dlopen_driver.c
index 4906fad..f9e6bfb 100644
--- a/bin/named/dlz_dlopen_driver.c
+++ b/bin/named/dlz_dlopen_driver.c
@@ -211,6 +211,7 @@ dlopen_dlz_create(const char *dlzname, unsigned int argc, char *argv[],
isc_mem_t *mctx = NULL;
isc_result_t result = ISC_R_FAILURE;
int r;
+ char buf[1024];
UNUSED(driverarg);
@@ -233,6 +234,24 @@ dlopen_dlz_create(const char *dlzname, unsigned int argc, char *argv[],
/* Initialize the lock */
isc_mutex_init(&cd->lock);
+#if HAVE_JEMALLOC
+ /*
+ * Disable RTLD_DEEPBIND in Samba DLZ module,
+ * see https://bugzilla.samba.org/show_bug.cgi?id=15643
+ * for more details.
+ */
+ r = uv_os_getenv("LDB_MODULES_DISABLE_DEEPBIND", buf,
+ &(size_t){ sizeof(buf) });
+ if (r == UV_ENOENT) {
+ r = uv_os_setenv("LDB_MODULES_DISABLE_DEEPBIND", "1");
+ }
+ if (r != 0) {
+ dlopen_log(ISC_LOG_WARNING,
+ "setting LDB_MODULES_DISABLE_DEEPBIND failed: %s",
+ uv_strerror(r));
+ }
+#endif
+
r = uv_dlopen(cd->dl_path, &cd->dl_handle);
if (r != 0) {
const char *errmsg = uv_dlerror(&cd->dl_handle);
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