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[IA64] Fill holes in FIXADDR_USER space with zero pages.

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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>
This commit is contained in:
David Mosberger-Tang 2005-06-08 10:45:00 -07:00 committed by Tony Luck
parent 2bfe94905d
commit ad597bd518
2 changed files with 23 additions and 4 deletions
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19
arch/ia64/mm/init.c
View file

@ -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();
}

8
include/asm-ia64/pgtable.h
View file

@ -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