[PATCH] unwinder: more sanity checks in Dwarf2 unwinder

Tighten the requirements on both input to and output from the Dwarf2
unwinder.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 6 deletions

diff --git a/include/asm-x86_64/unwind.h b/include/asm-x86_64/unwind.h
index 2e7ff10fd775..2f6349e48717 100644
--- a/include/asm-x86_64/unwind.h
+++ b/include/asm-x86_64/unwind.h
@@ -87,14 +87,10 @@ extern int arch_unwind_init_running(struct unwind_frame_info *,
 
 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
 {
-#if 0 /* This can only work when selector register saves/restores
-         are properly annotated (and tracked in UNW_REGISTER_INFO). */
-        return user_mode(&info->regs);
-#else
-        return (long)info->regs.rip >= 0
+        return user_mode(&info->regs)
+               || (long)info->regs.rip >= 0
                || (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
                || (long)info->regs.rsp >= 0;
-#endif
 }
 
 #else