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authorDavid Mosberger-Tang <davidm@hpl.hp.com>2005-06-08 10:45:00 -0700
committerTony Luck <tony.luck@intel.com>2005-06-08 10:58:21 -0700
commitad597bd518559f59ede8d01262cdf4467e13282e (patch)
treed86cef4525e0bfb45b22bd67f40e9c8d0eaa66b5 /arch/ia64
parent2bfe94905d3601774c6418c020ba830c118578b4 (diff)
[IA64] Fill holes in FIXADDR_USER space with zero pages.
This fixes an oops reported by Jason Baron. Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/mm/init.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 547785e3cba..4eb2f52b87a 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -305,8 +305,9 @@ setup_gate (void)
struct page *page;
/*
- * Map the gate page twice: once read-only to export the ELF headers etc. and once
- * execute-only page to enable privilege-promotion via "epc":
+ * Map the gate page twice: once read-only to export the ELF
+ * headers etc. and once execute-only page to enable
+ * privilege-promotion via "epc":
*/
page = virt_to_page(ia64_imva(__start_gate_section));
put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
@@ -315,6 +316,20 @@ setup_gate (void)
put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
#else
put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
+ /* Fill in the holes (if any) with read-only zero pages: */
+ {
+ unsigned long addr;
+
+ for (addr = GATE_ADDR + PAGE_SIZE;
+ addr < GATE_ADDR + PERCPU_PAGE_SIZE;
+ addr += PAGE_SIZE)
+ {
+ put_kernel_page(ZERO_PAGE(0), addr,
+ PAGE_READONLY);
+ put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
+ PAGE_READONLY);
+ }
+ }
#endif
ia64_patch_gate();
}