From e728f61ce05404a26447e6bbc1885ca5956d6a44 Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Wed, 21 Sep 2016 16:04:07 -0500 Subject: [PATCH] x86/boot: Move the _stext marker to before the boot code When core_kernel_text() is used to determine whether an address on a task's stack trace is a kernel text address, it incorrectly returns false for early text addresses for the head code between the _text and _stext markers. Among other things, this can cause the unwinder to behave incorrectly when unwinding to x86 head code. Head code is text code too, so mark it as such. This seems to match the intent of other users of the _stext symbol, and it also seems consistent with what other architectures are already doing. Signed-off-by: Josh Poimboeuf Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Nilay Vaish Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/789cf978866420e72fa89df44aa2849426ac378d.1474480779.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/vmlinux.lds.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index dbf67f64d5ec..e79f15f108a8 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -91,10 +91,10 @@ SECTIONS /* Text and read-only data */ .text : AT(ADDR(.text) - LOAD_OFFSET) { _text = .; + _stext = .; /* bootstrapping code */ HEAD_TEXT . = ALIGN(8); - _stext = .; TEXT_TEXT SCHED_TEXT CPUIDLE_TEXT -- 2.20.1