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| author | David Daney <ddaney@caviumnetworks.com> | 2009-09-02 15:47:34 -0700 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-09-17 20:07:52 +0200 |
| commit | 2ca2ebfd952d0338a0972c1f1f56b9b0c1a3b09c (patch) | |
| tree | 6a43cd0634d9eb6d2fd1247b89b309d97095d698 /arch/mips | |
| parent | e0cc87f59490d7d62a8ab2a76498dc8a2b64927a (diff) | |
| download | linux-2ca2ebfd952d0338a0972c1f1f56b9b0c1a3b09c.tar.gz linux-2ca2ebfd952d0338a0972c1f1f56b9b0c1a3b09c.tar.bz2 linux-2ca2ebfd952d0338a0972c1f1f56b9b0c1a3b09c.zip | |
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>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | 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 f956ecbb8136..e97a7a2fb2c0 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 } |