arm64: avoid returning from bad_mode

commit 7d9e8f71b989230bc613d121ca38507d34ada849 upstream.

Generally, taking an unexpected exception should be a fatal event, and
bad_mode is intended to cater for this. However, it should be possible
to contain unexpected synchronous exceptions from EL0 without bringing
the kernel down, by sending a SIGILL to the task.

We tried to apply this approach in commit 9955ac47f4ba1c95 ("arm64:
don't kill the kernel on a bad esr from el0"), by sending a signal for
any bad_mode call resulting from an EL0 exception.

However, this also applies to other unexpected exceptions, such as
SError and FIQ. The entry paths for these exceptions branch to bad_mode
without configuring the link register, and have no kernel_exit. Thus, if
we take one of these exceptions from EL0, bad_mode will eventually
return to the original user link register value.

This patch fixes this by introducing a new bad_el0_sync handler to cater
for the recoverable case, and restoring bad_mode to its original state,
whereby it calls panic() and never returns. The recoverable case
branches to bad_el0_sync with a bl, and returns to userspace via the
usual ret_to_user mechanism.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Fixes: 9955ac47f4ba1c95 ("arm64: don't kill the kernel on a bad esr from el0")
Reported-by: Mark Salter <msalter@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 24 insertions, 4 deletions

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index c9986b3e0a96..11e5eae088ab 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -596,17 +596,34 @@ const char *esr_get_class_string(u32 esr)
 }
 
 /*
- * bad_mode handles the impossible case in the exception vector.
+ * bad_mode handles the impossible case in the exception vector. This is always
+ * fatal.
  */
 asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
 {
-        siginfo_t info;
-        void __user *pc = (void __user *)instruction_pointer(regs);
         console_verbose();
 
         pr_crit("Bad mode in %s handler detected on CPU%d, code 0x%08x -- %s\n",
                 handler[reason], smp_processor_id(), esr,
                 esr_get_class_string(esr));
+
+        die("Oops - bad mode", regs, 0);
+        local_irq_disable();
+        panic("bad mode");
+}
+
+/*
+ * bad_el0_sync handles unexpected, but potentially recoverable synchronous
+ * exceptions taken from EL0. Unlike bad_mode, this returns.
+ */
+asmlinkage void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr)
+{
+        siginfo_t info;
+        void __user *pc = (void __user *)instruction_pointer(regs);
+        console_verbose();
+
+        pr_crit("Bad EL0 synchronous exception detected on CPU%d, code 0x%08x -- %s\n",
+                smp_processor_id(), esr, esr_get_class_string(esr));
         __show_regs(regs);
 
         info.si_signo = SIGILL;
@@ -614,7 +631,10 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
         info.si_code  = ILL_ILLOPC;
         info.si_addr  = pc;
 
-        arm64_notify_die("Oops - bad mode", regs, &info, 0);
+        current->thread.fault_address = 0;
+        current->thread.fault_code = 0;
+
+        force_sig_info(info.si_signo, &info, current);
 }
 
 void __pte_error(const char *file, int line, unsigned long val)