arm64: debug: Don't propagate UNKNOWN FAR into si_code for debug signals

FAR_EL1 is UNKNOWN for all debug exceptions other than those caused by
taking a hardware watchpoint. Unfortunately, if a debug handler returns
a non-zero value, then we will propagate the UNKNOWN FAR value to
userspace via the si_addr field of the SIGTRAP siginfo_t.

Instead, let's set si_addr to take on the PC of the faulting instruction,
which we have available in the current pt_regs.

Cc: <stable@vger.kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index efb7b2c..ef46925 100644 (file)
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -824,11 +824,12 @@ void __init hook_debug_fault_code(int nr,
        debug_fault_info[nr].name       = name;
 }
 
-asmlinkage int __exception do_debug_exception(unsigned long addr,
+asmlinkage int __exception do_debug_exception(unsigned long addr_if_watchpoint,
                                              unsigned int esr,
                                              struct pt_regs *regs)
 {
        const struct fault_info *inf = esr_to_debug_fault_info(esr);
+       unsigned long pc = instruction_pointer(regs);
        int rv;
 
        /*
@@ -838,14 +839,14 @@ asmlinkage int __exception do_debug_exception(unsigned long addr,
        if (interrupts_enabled(regs))
                trace_hardirqs_off();
 
-       if (user_mode(regs) && !is_ttbr0_addr(instruction_pointer(regs)))
+       if (user_mode(regs) && !is_ttbr0_addr(pc))
                arm64_apply_bp_hardening();
 
-       if (!inf->fn(addr, esr, regs)) {
+       if (!inf->fn(addr_if_watchpoint, esr, regs)) {
                rv = 1;
        } else {
                arm64_notify_die(inf->name, regs,
-                                inf->sig, inf->code, (void __user *)addr, esr);
+                                inf->sig, inf->code, (void __user *)pc, esr);
                rv = 0;
        }