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Add code comment about Linux stack randomization and shared memory.
Wed, 1 Feb 2006 16:00:06 +0000 (16:00 +0000)
Wed, 1 Feb 2006 16:00:06 +0000 (16:00 +0000)

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index 78d0471f85d2a84999a28958615abc230c294012..a89be34c09980dc09ef8017ca113a23f2b961129 100644 (file)
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.480 2006年02月01日 00:31:59 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.481 2006年02月01日 16:00:06 momjian Exp $
*
* NOTES
*
@@ -3336,7 +3336,18 @@ SubPostmasterMain(int argc, char *argv[])
/* Need a PGPROC to run CreateSharedMemoryAndSemaphores */
InitProcess();
- /* Attach process to shared data structures */
+ /*
+ * Attach process to shared data structures. If testing
+ * EXEC_BACKEND on Linux, you must run this as root
+ * before starting the postmaster:
+ *
+ * echo 0 >/proc/sys/kernel/randomize_va_space
+ *
+ * This prevents a randomized stack base address that causes
+ * child shared memory to be at a different address than
+ * the parent, making it impossible to attached to shared
+ * memory. Return the value to '1' when finished.
+ */
CreateSharedMemoryAndSemaphores(false, 0);
/* And run the backend */
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