]> git.baikalelectronics.ru Git - kernel.git/commit
kprobes/x86: Return correct length in __copy_instruction()
authorEugene Shatokhin <eugene.shatokhin@rosalab.ru>
Tue, 17 Mar 2015 10:09:18 +0000 (19:09 +0900)
committerIngo Molnar <mingo@kernel.org>
Tue, 17 Mar 2015 13:00:38 +0000 (14:00 +0100)
commitc63c6bb93ca67e77772baaffff45cb7c07df51dc
tree056afab9efce2ce76166abb5d6ba177d62e0ebb0
parent3a6b73398d7a959c80e29f6511e5996f9351e108
kprobes/x86: Return correct length in __copy_instruction()

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>
arch/x86/kernel/kprobes/core.c