In-Reply-To: <[email protected]>
On Fri, 6 Jan 2006 at 06:02:17 -0800, Stephane Eranian wrote:
> To my surprise, applying the same fix to the x86_64 does not
> solve the problem on my Opteron box. I verified that the
> offset (144) matches with what the kernel is expecting.
> Somehow the RF is lost or not set in the proper location.
> I cannot make forward progress once I reach the breakpoint.
I sent this to Andi this morning. Does it work for you?
Signed-off-by: Chuck Ebbert <[email protected]>
arch/x86_64/ia32/ptrace32.c | 9 ++++++---
arch/x86_64/kernel/ptrace.c | 9 ++++++---
2 files changed, 12 insertions(+), 6 deletions(-)
--- 2.6.15-64a.orig/arch/x86_64/ia32/ptrace32.c
+++ 2.6.15-64a/arch/x86_64/ia32/ptrace32.c
@@ -28,9 +28,12 @@
#include <asm/i387.h>
#include <asm/fpu32.h>
-/* determines which flags the user has access to. */
-/* 1 = access 0 = no access */
-#define FLAG_MASK 0x44dd5UL
+/*
+ * Determines which flags the user has access to [1 = access, 0 = no access].
+ * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
+ * Also masks reserved bits (31-22, 15, 5, 3, 1).
+ */
+#define FLAG_MASK 0x54dd5UL
#define R32(l,q) \
case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
--- 2.6.15-64a.orig/arch/x86_64/kernel/ptrace.c
+++ 2.6.15-64a/arch/x86_64/kernel/ptrace.c
@@ -36,9 +36,12 @@
* in exit.c or in signal.c.
*/
-/* determines which flags the user has access to. */
-/* 1 = access 0 = no access */
-#define FLAG_MASK 0x44dd5UL
+/*
+ * Determines which flags the user has access to [1 = access, 0 = no access].
+ * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
+ * Also masks reserved bits (63-22, 15, 5, 3, 1).
+ */
+#define FLAG_MASK 0x54dd5UL
/* set's the trap flag. */
#define TRAP_FLAG 0x100UL
--
Chuck
Currently reading: _Thud!_ by Terry Pratchett
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