From: Andi Kleen <ak@muc.de>
The EFLAGS checking was not correct. This also fixes some problems with
32bit gdb who would sometimes make the kernel BUG.
---
arch/x86_64/ia32/ptrace32.c | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff -puN arch/x86_64/ia32/ptrace32.c~x86_64-ptrace-fix arch/x86_64/ia32/ptrace32.c
--- 25/arch/x86_64/ia32/ptrace32.c~x86_64-ptrace-fix 2004-01-17 15:23:49.000000000 -0800
+++ 25-akpm/arch/x86_64/ia32/ptrace32.c 2004-01-17 15:23:49.000000000 -0800
@@ -26,6 +26,10 @@
#include <linux/ptrace.h>
#include <linux/mm.h>
+/* determines which flags the user has access to. */
+/* 1 = access 0 = no access */
+#define FLAG_MASK 0x44dd5UL
+
#define R32(l,q) \
case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
@@ -70,9 +74,12 @@ static int putreg32(struct task_struct *
R32(eip, rip);
R32(esp, rsp);
- case offsetof(struct user32, regs.eflags):
- stack[offsetof(struct pt_regs, eflags)/8] = val & 0x44dd5;
+ case offsetof(struct user32, regs.eflags): {
+ __u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
+ val &= FLAG_MASK;
+ *flags = val | (*flags & ~FLAG_MASK);
break;
+ }
case offsetof(struct user32, u_debugreg[4]):
case offsetof(struct user32, u_debugreg[5]):
_