kprobes/x86: Return correct length in __copy_instruction()

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[ Upstream commit c80e5c0c23 ]

On x86-64, __copy_instruction() always returns 0 (error) if the
instruction uses %rip-relative addressing. This is because
kernel_insn_init() is called the second time for 'insn' instance
in such cases and sets all its fields to 0.

Because of this, trying to place a kprobe on such instruction
will fail, register_kprobe() will return -EINVAL.

This patch fixes the problem.

Signed-off-by: Eugene Shatokhin <eugene.shatokhin@rosalab.ru>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Link: http://lkml.kernel.org/r/20150317100918.28349.94654.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Eugene Shatokhin 2015-03-17 19:09:18 +09:00 • committed by Sasha Levin

parent 1551f2cd43

commit b7f25a6e37

1 changed files with 5 additions and 2 deletions

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arch/x86/kernel/kprobes/core.c

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