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| author | Eugene Shatokhin <eugene.shatokhin@rosalab.ru> | 2015-03-17 19:09:18 +0900 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2015-05-28 09:59:56 +0100 |
| commit | 4b01a53c364a5ebbe8976d0376a2bcbdb8daf9ab (patch) | |
| tree | 42745c0c47e0444b098c8010e3e44a361424b945 /include | |
| parent | 5de413904bcdaecff62ef4953bec2da8d21341e8 (diff) | |
kprobes/x86: Return correct length in __copy_instruction()
commit c80e5c0c23ce2282476fdc64c4b5e3d3a40723fd upstream.
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>
[ luis: backported to 3.16: used Eugene's backport for 3.16.y-3.18.y ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions