MIPS: do_mcheck: Fix kernel code dump with EVA

If a machine check exception is raised in kernel mode, user context,
with EVA enabled, then the do_mcheck handler will attempt to read the
code around the EPC using EVA load instructions, i.e. as if the reads
were from user mode. This will either read random user data if the
process has anything mapped at the same address, or it will cause an
exception which is handled by __get_user, resulting in this output:

 Code: (Bad address in epc)

Fix by setting the current user access mode to kernel if the saved
register context indicates the exception was taken in kernel mode. This
causes __get_user to use normal loads to read the kernel code.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 3.15+
Patchwork: https://patchwork.linux-mips.org/patch/10777/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index e207a43b5f8f0bcbf0544e5289cfc08126cbc7f5..02484d17fb6f343d733364ede94f0bcc3387e8e6 100644 (file)
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1519,6 +1519,7 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
        const int field = 2 * sizeof(unsigned long);
        int multi_match = regs->cp0_status & ST0_TS;
        enum ctx_state prev_state;
+       mm_segment_t old_fs = get_fs();
 
        prev_state = exception_enter();
        show_regs(regs);
@@ -1540,8 +1541,13 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
                dump_tlb_all();
        }
 
+       if (!user_mode(regs))
+               set_fs(KERNEL_DS);
+
        show_code((unsigned int __user *) regs->cp0_epc);
 
+       set_fs(old_fs);
+
        /*
         * Some chips may have other causes of machine check (e.g. SB1
         * graduation timer)