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@xxxxxxxxxxxxxxxxxx>
---
arch/mips/mm/fault.c | 12 ++++++++++--
1 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index f956ecb..e97a7a2 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -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 @@ do_sigbus:
force_sig_info(SIGBUS, &info, tsk);
return;
+#ifndef CONFIG_64BIT
vmalloc_fault:
{
/*
@@ -241,4 +248,5 @@ vmalloc_fault:
goto no_context;
return;
}
+#endif
}
--
1.6.0.6
