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| author | David Mosberger-Tang <davidm@hpl.hp.com> | 2005-06-08 10:45:00 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-06-08 10:58:21 -0700 |
| commit | ad597bd518559f59ede8d01262cdf4467e13282e (patch) | |
| tree | d86cef4525e0bfb45b22bd67f40e9c8d0eaa66b5 | |
| parent | 2bfe94905d3601774c6418c020ba830c118578b4 (diff) | |
| download | op-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.c | 19 | ||||
| -rw-r--r-- | include/asm-ia64/pgtable.h | 8 |
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 |
