https://github.com/torvalds/linux
Revision c93f5cf571e7795f97d49ef51b766cf25e328545 authored by Masami Hiramatsu on 25 May 2017, 10:38:17 UTC, committed by Steven Rostedt (VMware) on 27 May 2017, 02:37:00 UTC
Fix kprobes to set(recover) RWX bits correctly on trampoline
buffer before releasing it. Releasing readonly page to
module_memfree() crash the kernel.
Without this fix, if kprobes user register a bunch of kprobes
in function body (since kprobes on function entry usually
use ftrace) and unregister it, kernel hits a BUG and crash.
Link: http://lkml.kernel.org/r/149570868652.3518.14120169373590420503.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: d0381c81c2f7 ("kprobes/x86: Set kprobes pages read-only")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Tip revision: c93f5cf571e7795f97d49ef51b766cf25e328545 authored by Masami Hiramatsu on 25 May 2017, 10:38:17 UTC
kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
Tip revision: c93f5cf
.get_maintainer.ignore
Christoph Hellwig <hch@lst.de>
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