[Devel] ms/kprobes/x86: Return correct length in __copy_instruction()

Submitted by Evgenii Shatokhin on June 1, 2017, 12:06 p.m.


Message ID 1496318790-27955-2-git-send-email-eshatokhin@virtuozzo.com
State New
Series "ms/kprobes/x86: Return correct length in __copy_instruction()"
Headers show

Commit Message

Evgenii Shatokhin June 1, 2017, 12:06 p.m.
From: Eugene Shatokhin <eugene.shatokhin@rosalab.ru>

ms commit: c80e5c0c23ce2282476fdc64c4b5e3d3a40723fd

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: Evgenii Shatokhin <eshatokhin@virtuozzo.com>
 arch/x86/kernel/kprobes/core.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

Patch hide | download patch | download mbox

diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 37330ee..39f2d05 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -327,21 +327,24 @@  int __kprobes __copy_instruction(u8 *dest, u8 *src)
 	struct insn insn;
 	kprobe_opcode_t buf[MAX_INSN_SIZE];
+	int length;
 	unsigned long recovered_insn =
 		recover_probed_instruction(buf, (unsigned long)src);
 	kernel_insn_init(&insn, (void *)recovered_insn, MAX_INSN_SIZE);
+	length = insn.length;
 	/* Another subsystem puts a breakpoint, failed to recover */
 	if (insn.opcode.bytes[0] == BREAKPOINT_INSTRUCTION)
 		return 0;
-	memcpy(dest, insn.kaddr, insn.length);
+	memcpy(dest, insn.kaddr, length);
 #ifdef CONFIG_X86_64
 	if (insn_rip_relative(&insn)) {
 		s64 newdisp;
 		u8 *disp;
-		kernel_insn_init(&insn, dest, insn.length);
+		kernel_insn_init(&insn, dest, length);
 		 * The copied instruction uses the %rip-relative addressing
@@ -365,7 +368,7 @@  int __kprobes __copy_instruction(u8 *dest, u8 *src)
 		*(s32 *) disp = (s32) newdisp;
-	return insn.length;
+	return length;
 static int __kprobes arch_copy_kprobe(struct kprobe *p)