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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
parent2bfe94905d3601774c6418c020ba830c118578b4 (diff)
downloadop-kernel-dev-ad597bd518559f59ede8d01262cdf4467e13282e.zip
op-kernel-dev-ad597bd518559f59ede8d01262cdf4467e13282e.tar.gz
[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>
-rw-r--r--arch/ia64/mm/init.c19
-rw-r--r--include/asm-ia64/pgtable.h8
2 files changed, 23 insertions, 4 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 547785e..4eb2f52 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();
}
diff --git a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h
index ea121a0..fcc9c33 100644
--- a/include/asm-ia64/pgtable.h
+++ b/include/asm-ia64/pgtable.h
@@ -8,7 +8,7 @@
* This hopefully works with any (fixed) IA-64 page-size, as defined
* in <asm/page.h>.
*
- * Copyright (C) 1998-2004 Hewlett-Packard Co
+ * Copyright (C) 1998-2005 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*/
@@ -551,7 +551,11 @@ do { \
/* These tell get_user_pages() that the first gate page is accessible from user-level. */
#define FIXADDR_USER_START GATE_ADDR
-#define FIXADDR_USER_END (GATE_ADDR + 2*PERCPU_PAGE_SIZE)
+#ifdef HAVE_BUGGY_SEGREL
+# define FIXADDR_USER_END (GATE_ADDR + 2*PAGE_SIZE)
+#else
+# define FIXADDR_USER_END (GATE_ADDR + 2*PERCPU_PAGE_SIZE)
+#endif
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
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