x86_64: Fix compat emulation of PTRACE_GET/SET_THREAD_AREA
Since the 64bit kernel has different indexes for this TLS segments
the address needs to be adjusted in the ptrace 32bit emulation.
[ tglx: arch/x86 adaptation ]
Reported-by: Amnon Shiloh
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c
index 4a233ad..f52770e 100644
--- a/arch/x86/ia32/ptrace32.c
+++ b/arch/x86/ia32/ptrace32.c
@@ -228,6 +228,8 @@
return ret;
}
+#define COMPAT_GDT_ENTRY_TLS_MIN 6
+
asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
{
struct task_struct *child;
@@ -246,8 +248,6 @@
case PTRACE_SYSCALL:
case PTRACE_OLDSETOPTIONS:
case PTRACE_SETOPTIONS:
- case PTRACE_SET_THREAD_AREA:
- case PTRACE_GET_THREAD_AREA:
return sys_ptrace(request, pid, addr, data);
default:
@@ -271,6 +271,12 @@
case PTRACE_SETSIGINFO:
case PTRACE_GETSIGINFO:
return ptrace32_siginfo(request, pid, addr, data);
+
+ case PTRACE_SET_THREAD_AREA:
+ case PTRACE_GET_THREAD_AREA:
+ return sys_ptrace(request, pid,
+ addr + GDT_ENTRY_TLS_MIN - COMPAT_GDT_ENTRY_TLS_MIN,
+ data);
}
child = ptrace_get_task_struct(pid);