Change uprobe_init_insn() to make insn_complete() == T, this makes
other insn_get_*() calls unnecessary.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
---
arch/x86/kernel/uprobes.c | 13 ++++---------
1 files changed, 4 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 5876ba5..6748600 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -209,8 +209,11 @@ static int uprobe_init_insn(struct arch_uprobe *auprobe,
struct insn *insn, bool
u32 volatile *good_insns;
insn_init(insn, auprobe->insn, x86_64);
+ /* has the side-effect of processing the entire instruction */
+ insn_get_length(insn);
+ if (WARN_ON_ONCE(!insn_complete(insn)))
+ return -ENOEXEC;
- insn_get_opcode(insn);
if (is_prefix_bad(insn))
return -ENOTSUPP;
@@ -283,8 +286,6 @@ handle_riprel_insn(struct arch_uprobe *auprobe, struct insn
*insn)
* is the immediate operand.
*/
cursor = auprobe->insn + insn_offset_modrm(insn);
- insn_get_length(insn);
-
/*
* Convert from rip-relative addressing to indirect addressing
* via a scratch register. Change the r/m field from 0x5 (%rip)
@@ -563,11 +564,6 @@ static int branch_setup_xol_ops(struct arch_uprobe
*auprobe, struct insn *insn)
{
u8 opc1 = OPCODE1(insn);
- /* has the side-effect of processing the entire instruction */
- insn_get_length(insn);
- if (WARN_ON_ONCE(!insn_complete(insn)))
- return -ENOEXEC;
-
switch (opc1) {
case 0xeb: /* jmp 8 */
case 0xe9: /* jmp 32 */
@@ -643,7 +639,6 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe,
struct mm_struct *mm,
fix_ip = false;
break;
case 0xff:
- insn_get_modrm(&insn);
switch (MODRM_REG(&insn)) {
case 2: case 3: /* call or lcall, indirect */
fix_call = true;
--
1.5.5.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
