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authorChristoph Hellwig <hch@lst.de>2020-06-08 21:34:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:15 -0700
commit9de1fec50b23117f0a19f7609cc837ca72e764a6 (patch)
tree067572c59d739d213debb438e5eed52dc3aed4d6 /mm/maccess.c
parent8d92db5c04d10381f4db70ed99b1b576f5db18a7 (diff)
tracing/kprobes: handle mixed kernel/userspace probes better
Instead of using the dangerous probe_kernel_read and strncpy_from_unsafe helpers, rework probes to try a user probe based on the address if the architecture has a common address space for kernel and userspace. [svens@linux.ibm.com:use strncpy_from_kernel_nofault() in fetch_store_string()] Link: http://lkml.kernel.org/r/20200606181903.49384-1-svens@linux.ibm.com Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20200521152301.2587579-15-hch@lst.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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