x86/dumpstack: Dump user space code correctly again
H.J. reported that post 5.7 a segfault of a user space task does not longer dump the Code bytes when /proc/sys/debug/exception-trace is enabled. It prints 'Code: Bad RIP value.' instead. This was broken by a recent change which made probe_kernel_read() reject non-kernel addresses. Update show_opcodes() so it retrieves user space opcodes via copy_from_user_nmi(). Fixes: 98a23609 ("maccess: always use strict semantics for probe_kernel_read") Reported-by:H.J. Lu <hjl.tools@gmail.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/87h7tz306w.fsf@nanos.tec.linutronix.de
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039a7a30
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