* [PATCH] clear_page_tables
@ 2001-08-23 19:05 Ben LaHaise
0 siblings, 0 replies; only message in thread
From: Ben LaHaise @ 2001-08-23 19:05 UTC (permalink / raw)
To: alan; +Cc: linux-mm
Heylo,
The patch below fixes a lack of locking in clear_page_tables which could
result in kswapd poking at page tables that have been freed.
-ben
/patches/v2.4.8-ac9-clear_page_tables-lock.diff...
diff -ur /md0/kernels/2.4/v2.4.8-ac9/mm/memory.c vm-v2.4.8-ac9/mm/memory.c
--- /md0/kernels/2.4/v2.4.8-ac9/mm/memory.c Thu Aug 23 13:48:25 2001
+++ vm-v2.4.8-ac9/mm/memory.c Thu Aug 23 14:45:46 2001
@@ -129,11 +129,13 @@
{
pgd_t * page_dir = mm->pgd;
+ spin_lock(&mm->page_table_lock);
page_dir += first;
do {
free_one_pgd(page_dir);
page_dir++;
} while (--nr);
+ spin_unlock(&mm->page_table_lock);
/* keep the page table cache within bounds */
check_pgt_cache();
--
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