From: James Hogan <james.hogan@xxxxxxxxxx> This patch has been added to the 3.18 stable tree. If you have any objections, please let us know. =============== [ Upstream commit 55c723e181ccec30fb5c672397fe69ec35967d97 ] 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@xxxxxxxxxx> Cc: Markos Chandras <markos.chandras@xxxxxxxxxx> Cc: Leonid Yegoshin <leonid.yegoshin@xxxxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: <stable@xxxxxxxxxxxxxxx> # 3.15+ Patchwork: https://patchwork.linux-mips.org/patch/10777/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx> --- arch/mips/kernel/traps.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index d255a2a..0c02c05 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1376,6 +1376,7 @@ 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); @@ -1390,8 +1391,13 @@ 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) -- 2.1.4
