Merge to Fedora kernel-2.6.18-1.2255_FC5-vs2.0.2.2-rc9 patched with stable patch...

[linux-2.6.git] / arch / i386 / kernel / entry-xen.S

diff --git a/arch/i386/kernel/entry-xen.S b/arch/i386/kernel/entry-xen.S
index 4c571d7..45b7f74 100644 (file)
--- a/arch/i386/kernel/entry-xen.S
+++ b/arch/i386/kernel/entry-xen.S
@@ -344,7 +344,7 @@ sysenter_past_esp:
        GET_THREAD_INFO(%ebp)
 
        /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
-       testw $(_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
+       testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
        jnz syscall_trace_entry
        cmpl $(nr_syscalls), %eax
        jae syscall_badsys
@@ -395,7 +395,7 @@ ENTRY(system_call)
 no_singlestep:
                                        # system call tracing in operation / emulation
        /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
-       testw $(_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
+       testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
        jnz syscall_trace_entry
        cmpl $(nr_syscalls), %eax
        jae syscall_badsys
@@ -545,6 +545,9 @@ syscall_trace_entry:
        movl %esp, %eax
        xorl %edx,%edx
        call do_syscall_trace
+       cmpl $0, %eax
+       jne resume_userspace            # ret != 0 -> running under PTRACE_SYSEMU,
+                                       # so must skip actual syscall
        movl ORIG_EAX(%esp), %eax
        cmpl $(nr_syscalls), %eax
        jnae syscall_call