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x86/unwind: Disable KASAN checking in the ORC unwinder
Fengguang reported a KASAN warning: Kprobe smoke test: started ================================================================== BUG: KASAN: stack-out-of-bounds in deref_stack_reg+0xb5/0x11a Read of size 8 at addr ffff8800001c7cd8 by task swapper/1 CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.0-rc8 rockchip-linux#26 Call Trace: <#DB> ... save_trace+0xd9/0x1d3 mark_lock+0x5f7/0xdc3 __lock_acquire+0x6b4/0x38ef lock_acquire+0x1a1/0x2aa _raw_spin_lock_irqsave+0x46/0x55 kretprobe_table_lock+0x1a/0x42 pre_handler_kretprobe+0x3f5/0x521 kprobe_int3_handler+0x19c/0x25f do_int3+0x61/0x142 int3+0x30/0x60 [...] The ORC unwinder got confused by some kprobes changes, which isn't surprising since the runtime code no longer matches vmlinux and the stack was modified for kretprobes. Until we have a way for generated code to register changes with the unwinder, these types of warnings are inevitable. So just disable KASAN checks for stack accesses in the ORC unwinder. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20171108021934.zbl6unh5hpugybc5@treble Signed-off-by: Ingo Molnar <mingo@kernel.org>
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