diff options
| 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 /arch/ia64 | |
| parent | 2bfe94905d3601774c6418c020ba830c118578b4 (diff) | |
| download | linux-ad597bd518559f59ede8d01262cdf4467e13282e.tar.bz2 | |
[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.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index 547785e3cba2..4eb2f52b87a1 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(); } |