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| author | Bruce Momjian <bruce@momjian.us> | 2006-02-01 16:00:06 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2006-02-01 16:00:06 +0000 |
| commit | 47a86fa02d0ff58438dea2ef2005a6cd8938f8c4 (patch) | |
| tree | ef7f8d573ed7f098f9c7481a0988668b2e507fc9 /src | |
| parent | 802c7aa30f0832246a8de71b254da1cf7d6c737c (diff) | |
| download | postgresql-47a86fa02d0ff58438dea2ef2005a6cd8938f8c4.tar.gz postgresql-47a86fa02d0ff58438dea2ef2005a6cd8938f8c4.zip | |
Add code comment about Linux stack randomization and shared memory.
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/postmaster/postmaster.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c index 78d0471f85d..a89be34c099 100644 --- 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 2006/02/01 00:31:59 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.481 2006/02/01 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 */ |