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MIPS: Don't corrupt page tables on vmalloc fault. 

The code after the vmalloc_fault: label in do_page_fault() modifies
user page tables, this is not correct for 64-bit kernels.

For 64-bit kernels we should go straight to the no_context handler
skipping vmalloc_fault.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2009-09-02 15:47:34 -07:00 committed by Ralf Baechle
parent e0cc87f594
commit 2ca2ebfd95
1 changed files with 10 additions and 2 deletions
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12
arch/mips/mm/fault.c
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@ -58,11 +58,17 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
* only copy the information from the master page table, * only copy the information from the master page table,
* nothing more. * nothing more.
*/ */
#ifdef CONFIG_64BIT
# define VMALLOC_FAULT_TARGET no_context
#else
# define VMALLOC_FAULT_TARGET vmalloc_fault
#endif
if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END)) if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END))
goto vmalloc_fault; goto VMALLOC_FAULT_TARGET;
#ifdef MODULE_START #ifdef MODULE_START
if (unlikely(address >= MODULE_START && address < MODULE_END)) if (unlikely(address >= MODULE_START && address < MODULE_END))
goto vmalloc_fault; goto VMALLOC_FAULT_TARGET;
#endif #endif
/* /*
@ -203,6 +209,7 @@ do_sigbus:
force_sig_info(SIGBUS, &info, tsk); force_sig_info(SIGBUS, &info, tsk);
return; return;
#ifndef CONFIG_64BIT
vmalloc_fault: vmalloc_fault:
{ {
/* /*
@ -241,4 +248,5 @@ vmalloc_fault:
goto no_context; goto no_context;
return; return;
} }
#endif
} }