4.19-stable review patch. If anyone has any objections, please let me know.
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From: Will Deacon will.deacon@arm.com
commit b9a4b9d084d978f80eb9210727c81804588b42ff upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm64/mm/fault.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -827,11 +827,12 @@ 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 = debug_fault_info + DBG_ESR_EVT(esr); + unsigned long pc = instruction_pointer(regs); int rv;
/* @@ -841,10 +842,10 @@ asmlinkage int __exception do_debug_exce if (interrupts_enabled(regs)) trace_hardirqs_off();
- if (user_mode(regs) && instruction_pointer(regs) > TASK_SIZE) + if (user_mode(regs) && pc > TASK_SIZE) arm64_apply_bp_hardening();
- if (!inf->fn(addr, esr, regs)) { + if (!inf->fn(addr_if_watchpoint, esr, regs)) { rv = 1; } else { struct siginfo info; @@ -853,7 +854,7 @@ asmlinkage int __exception do_debug_exce info.si_signo = inf->sig; info.si_errno = 0; info.si_code = inf->code; - info.si_addr = (void __user *)addr; + info.si_addr = (void __user *)pc; arm64_notify_die(inf->name, regs, &info, esr); rv = 0; }