Commit 2ca2ebfd authored by David Daney's avatar David Daney Committed by Ralf Baechle

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: default avatarDavid Daney <ddaney@caviumnetworks.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent e0cc87f5
......@@ -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,
* 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))
goto vmalloc_fault;
goto VMALLOC_FAULT_TARGET;
#ifdef MODULE_START
if (unlikely(address >= MODULE_START && address < MODULE_END))
goto vmalloc_fault;
goto VMALLOC_FAULT_TARGET;
#endif
/*
......@@ -203,6 +209,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
force_sig_info(SIGBUS, &info, tsk);
return;
#ifndef CONFIG_64BIT
vmalloc_fault:
{
/*
......@@ -241,4 +248,5 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
goto no_context;
return;
}
#endif
}
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