When testing for the REX instruction prefix, first check
for a 32-bit task because in compat mode the REX prefix is an
increment instruction.
Signed-off-by: Chuck Ebbert <[email protected]>
---
Compiled and booted but needs a test case...
--- 2.6.18-rc2-64.orig/arch/x86_64/kernel/ptrace.c
+++ 2.6.18-rc2-64/arch/x86_64/kernel/ptrace.c
@@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct
case 0xf0: case 0xf2: case 0xf3:
continue;
- /* REX prefixes */
case 0x40 ... 0x4f:
+ if (is_compat_task())
+ /* register increment */
+ return 0;
+ /* REX prefix */
continue;
/* CHECKME: f0, f2, f3 */
--
Chuck
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